2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright 1995 Yggdrasil Computing, Incorporated.
|
|
|
|
.\" written by Adam J. Richter (adam@yggdrasil.com),
|
|
|
|
.\" with typesetting help from Daniel Quinlan (quinlan@yggdrasil.com).
|
2007-09-20 06:52:22 +00:00
|
|
|
.\" and Copyright 2003 Michael Kerrisk (mtk.manpages@gmail.com).
|
2004-11-03 13:51:07 +00:00
|
|
|
.\"
|
getent.1, _syscall.2, acct.2, adjtimex.2, bdflush.2, brk.2, cacheflush.2, getsid.2, getxattr.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, ioperm.2, ipc.2, listxattr.2, mlock.2, modify_ldt.2, mremap.2, nanosleep.2, outb.2, perf_event_open.2, ptrace.2, removexattr.2, s390_runtime_instr.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, setsid.2, setxattr.2, socketcall.2, unimplemented.2, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, cfree.3, crypt.3, dlopen.3, encrypt.3, errno.3, fenv.3, ftime.3, ftw.3, getgrent_r.3, getpass.3, getpwent_r.3, getutent.3, hsearch.3, lio_listio.3, lockf.3, login.3, longjmp.3, perror.3, printf.3, scandirat.3, setjmp.3, strfmon.3, strtoimax.3, termios.3, ttyname.3, ualarm.3, updwtmp.3, wcstoimax.3, wordexp.3, console_ioctl.4, dsp56k.4, fd.4, hd.4, intro.4, lp.4, mem.4, null.4, ram.4, rtc.4, sk98lin.4, tty.4, ttyS.4, vcs.4, filesystems.5, group.5, host.conf.5, hosts.5, intro.5, issue.5, motd.5, networks.5, nologin.5, nsswitch.conf.5, passwd.5, proc.5, protocols.5, securetty.5, shells.5, termcap.5, ttytype.5, utmp.5, intro.6, armscii-8.7, ascii.7, bootparam.7, cp1251.7, environ.7, glob.7, intro.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, posixoptions.7, standards.7, unicode.7, utf-8.7, intro.8: s/GPLv2+_doc_full/GPLv2+_DOC_FULL/
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:29:46 +00:00
|
|
|
.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
|
2004-11-03 13:51:07 +00:00
|
|
|
.\" This is free documentation; you can redistribute it and/or
|
|
|
|
.\" modify it under the terms of the GNU General Public License as
|
|
|
|
.\" published by the Free Software Foundation; either version 2 of
|
|
|
|
.\" the License, or (at your option) any later version.
|
|
|
|
.\"
|
|
|
|
.\" The GNU General Public License's references to "object code"
|
|
|
|
.\" and "executables" are to be interpreted as the output of any
|
|
|
|
.\" document formatting or typesetting system, including
|
|
|
|
.\" intermediate and printed output.
|
|
|
|
.\"
|
|
|
|
.\" This manual is distributed in the hope that it will be useful,
|
|
|
|
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
.\" GNU General Public License for more details.
|
|
|
|
.\"
|
|
|
|
.\" You should have received a copy of the GNU General Public
|
getent.1, _syscall.2, acct.2, adjtimex.2, bdflush.2, brk.2, cacheflush.2, getsid.2, getxattr.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, ioperm.2, ipc.2, listxattr.2, mlock.2, modify_ldt.2, mremap.2, nanosleep.2, outb.2, ptrace.2, removexattr.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, setsid.2, setxattr.2, socketcall.2, unimplemented.2, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, cfree.3, crypt.3, dlopen.3, errno.3, fenv.3, ftime.3, ftw.3, getgrent_r.3, getpass.3, getpwent_r.3, getutent.3, hsearch.3, lio_listio.3, login.3, longjmp.3, perror.3, printf.3, scandirat.3, setjmp.3, strfmon.3, strtoimax.3, termios.3, ttyname.3, ualarm.3, wcstoimax.3, wordexp.3, console_ioctl.4, dsp56k.4, fd.4, hd.4, intro.4, lp.4, mem.4, null.4, ram.4, rtc.4, sk98lin.4, tty.4, ttyS.4, vcs.4, charmap.5, filesystems.5, ftpusers.5, gai.conf.5, group.5, host.conf.5, hosts.5, intro.5, issue.5, locale.5, motd.5, networks.5, nologin.5, nscd.conf.5, nss.5, nsswitch.conf.5, passwd.5, proc.5, protocols.5, securetty.5, shells.5, termcap.5, ttytype.5, utmp.5, intro.6, armscii-8.7, ascii.7, bootparam.7, cp1251.7, cpuset.7, environ.7, glob.7, intro.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, posixoptions.7, standards.7, unicode.7, utf-8.7, intro.8, ldconfig.8, nscd.8: Global fix: Update info in source comments on where to get a copy of the GPL
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:28:43 +00:00
|
|
|
.\" License along with this manual; if not, see
|
|
|
|
.\" <http://www.gnu.org/licenses/>.
|
getent.1, _syscall.2, acct.2, adjtimex.2, bdflush.2, brk.2, cacheflush.2, getsid.2, getxattr.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, ioperm.2, ipc.2, listxattr.2, mlock.2, modify_ldt.2, mremap.2, nanosleep.2, outb.2, perf_event_open.2, ptrace.2, removexattr.2, s390_runtime_instr.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, setsid.2, setxattr.2, socketcall.2, unimplemented.2, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, cfree.3, crypt.3, dlopen.3, encrypt.3, errno.3, fenv.3, ftime.3, ftw.3, getgrent_r.3, getpass.3, getpwent_r.3, getutent.3, hsearch.3, lio_listio.3, lockf.3, login.3, longjmp.3, perror.3, printf.3, scandirat.3, setjmp.3, strfmon.3, strtoimax.3, termios.3, ttyname.3, ualarm.3, updwtmp.3, wcstoimax.3, wordexp.3, console_ioctl.4, dsp56k.4, fd.4, hd.4, intro.4, lp.4, mem.4, null.4, ram.4, rtc.4, sk98lin.4, tty.4, ttyS.4, vcs.4, filesystems.5, group.5, host.conf.5, hosts.5, intro.5, issue.5, motd.5, networks.5, nologin.5, nsswitch.conf.5, passwd.5, proc.5, protocols.5, securetty.5, shells.5, termcap.5, ttytype.5, utmp.5, intro.6, armscii-8.7, ascii.7, bootparam.7, cp1251.7, environ.7, glob.7, intro.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, posixoptions.7, standards.7, unicode.7, utf-8.7, intro.8: Global fix: Add LICENSE_START(GPLv2+_doc_full)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:28:44 +00:00
|
|
|
.\" %%%LICENSE_END
|
2004-11-03 13:51:07 +00:00
|
|
|
.\"
|
|
|
|
.\" Modified by David A. Wheeler <dwheeler@dwheeler.com> 2000-11-28.
|
|
|
|
.\" Applied patch by Terran Melconian, aeb, 2001-12-14.
|
|
|
|
.\" Modified by Hacksaw <hacksaw@hacksaw.org> 2003-03-13.
|
|
|
|
.\" Modified by Matt Domsch, 2003-04-09: _init and _fini obsolete
|
2007-09-20 06:52:22 +00:00
|
|
|
.\" Modified by Michael Kerrisk <mtk.manpages@gmail.com> 2003-05-16.
|
2004-11-03 13:51:07 +00:00
|
|
|
.\" Modified by Walter Harms: dladdr, dlvsym
|
2008-12-05 22:45:53 +00:00
|
|
|
.\" Modified by Petr Baudis <pasky@suse.cz>, 2008-12-04: dladdr caveat
|
2004-11-03 13:51:07 +00:00
|
|
|
.\"
|
2014-01-08 01:07:34 +00:00
|
|
|
.TH DLOPEN 3 2014-01-08 "Linux" "Linux Programmer's Manual"
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH NAME
|
|
|
|
dladdr, dlclose, dlerror, dlopen, dlsym, dlvsym \- programming interface to
|
|
|
|
dynamic linking loader
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.B #include <dlfcn.h>
|
|
|
|
.sp
|
|
|
|
.BI "void *dlopen(const char *" filename ", int " flag );
|
|
|
|
.sp
|
2007-09-20 16:26:31 +00:00
|
|
|
.B "char *dlerror(void);"
|
2004-11-03 13:51:07 +00:00
|
|
|
.sp
|
|
|
|
.BI "void *dlsym(void *" handle ", const char *" symbol );
|
|
|
|
.sp
|
|
|
|
.BI "int dlclose(void *" handle );
|
2007-10-23 14:01:03 +00:00
|
|
|
.sp
|
|
|
|
Link with \fI\-ldl\fP.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH DESCRIPTION
|
|
|
|
The four functions
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen (),
|
|
|
|
.BR dlsym (),
|
|
|
|
.BR dlclose (),
|
|
|
|
.BR dlerror ()
|
2004-11-03 13:51:07 +00:00
|
|
|
implement the interface to the dynamic linking loader.
|
intro.1, time.1, _syscall.2, accept.2, capget.2, clone.2, execve.2, fcntl.2, intro.2, ioctl_list.2, ioprio_set.2, kill.2, mlock.2, nanosleep.2, perf_event_open.2, select.2, stat.2, times.2, ustat.2, vfork.2, wait.2, cfree.3, dbopen.3, dlopen.3, fenv.3, fmtmsg.3, gamma.3, getaddrinfo.3, gethostbyname.3, getnameinfo.3, getspnam.3, login.3, printf.3, regex.3, stdio.3, sysconf.3, termios.3, ttyslot.3, undocumented.3, wordexp.3, console_codes.4, initrd.4, mouse.4, random.4, st.4, tty_ioctl.4, wavelan.4, charmap.5, dir_colors.5, hosts.5, termcap.5, armscii-8.7, boot.7, bootparam.7, capabilities.7, charsets.7, ddp.7, futex.7, glob.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, man.7, numa.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, rtnetlink.7, signal.7, time.7, udp.7, udplite.7, unicode.7, uri.7, utf-8.7: G;lobal fix: remove unneeded double quotes in .SS headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:02:18 +00:00
|
|
|
.SS dlerror()
|
2004-11-03 13:51:07 +00:00
|
|
|
The function
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlerror ()
|
2014-01-15 23:43:53 +00:00
|
|
|
returns a human-readable string describing the most recent error
|
2007-04-12 22:42:49 +00:00
|
|
|
that occurred from
|
|
|
|
.BR dlopen (),
|
|
|
|
.BR dlsym ()
|
|
|
|
or
|
2005-10-20 15:11:10 +00:00
|
|
|
.BR dlclose ()
|
2004-11-03 13:51:07 +00:00
|
|
|
since the last call to
|
2007-12-10 15:03:27 +00:00
|
|
|
.BR dlerror ().
|
2004-11-03 13:51:07 +00:00
|
|
|
It returns NULL if no errors have occurred since initialization or since
|
|
|
|
it was last called.
|
intro.1, time.1, _syscall.2, accept.2, capget.2, clone.2, execve.2, fcntl.2, intro.2, ioctl_list.2, ioprio_set.2, kill.2, mlock.2, nanosleep.2, perf_event_open.2, select.2, stat.2, times.2, ustat.2, vfork.2, wait.2, cfree.3, dbopen.3, dlopen.3, fenv.3, fmtmsg.3, gamma.3, getaddrinfo.3, gethostbyname.3, getnameinfo.3, getspnam.3, login.3, printf.3, regex.3, stdio.3, sysconf.3, termios.3, ttyslot.3, undocumented.3, wordexp.3, console_codes.4, initrd.4, mouse.4, random.4, st.4, tty_ioctl.4, wavelan.4, charmap.5, dir_colors.5, hosts.5, termcap.5, armscii-8.7, boot.7, bootparam.7, capabilities.7, charsets.7, ddp.7, futex.7, glob.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, man.7, numa.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, rtnetlink.7, signal.7, time.7, udp.7, udplite.7, unicode.7, uri.7, utf-8.7: G;lobal fix: remove unneeded double quotes in .SS headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:02:18 +00:00
|
|
|
.SS dlopen()
|
2004-11-03 13:51:07 +00:00
|
|
|
The function
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen ()
|
2004-11-03 13:51:07 +00:00
|
|
|
loads the dynamic library file named by the null-terminated
|
|
|
|
string
|
|
|
|
.I filename
|
|
|
|
and returns an opaque "handle" for the dynamic library.
|
|
|
|
If
|
|
|
|
.I filename
|
|
|
|
is NULL, then the returned handle is for the main program.
|
|
|
|
If
|
|
|
|
.I filename
|
|
|
|
contains a slash ("/"), then it is interpreted as a (relative
|
|
|
|
or absolute) pathname.
|
|
|
|
Otherwise, the dynamic linker searches for the library as follows
|
|
|
|
(see
|
|
|
|
.BR ld.so (8)
|
|
|
|
for further details):
|
2007-06-15 21:40:11 +00:00
|
|
|
.IP o 4
|
2004-11-03 13:51:07 +00:00
|
|
|
(ELF only) If the executable file for the calling program
|
|
|
|
contains a DT_RPATH tag, and does not contain a DT_RUNPATH tag,
|
|
|
|
then the directories listed in the DT_RPATH tag are searched.
|
|
|
|
.IP o
|
2008-10-27 15:37:21 +00:00
|
|
|
If, at the time that the program was started, the environment variable
|
2007-09-20 16:26:31 +00:00
|
|
|
.B LD_LIBRARY_PATH
|
2008-10-27 15:37:21 +00:00
|
|
|
was defined to contain a colon-separated list of directories,
|
2004-11-03 13:51:07 +00:00
|
|
|
then these are searched.
|
2007-04-12 22:42:49 +00:00
|
|
|
(As a security measure this variable is ignored for set-user-ID and
|
2005-07-18 14:25:42 +00:00
|
|
|
set-group-ID programs.)
|
2004-11-03 13:51:07 +00:00
|
|
|
.IP o
|
|
|
|
(ELF only) If the executable file for the calling program
|
|
|
|
contains a DT_RUNPATH tag, then the directories listed in that tag
|
|
|
|
are searched.
|
|
|
|
.IP o
|
|
|
|
The cache file
|
2007-09-20 16:26:31 +00:00
|
|
|
.I /etc/ld.so.cache
|
2004-11-03 13:51:07 +00:00
|
|
|
(maintained by
|
|
|
|
.BR ldconfig (8))
|
|
|
|
is checked to see whether it contains an entry for
|
|
|
|
.IR filename .
|
|
|
|
.IP o
|
|
|
|
The directories
|
2007-04-12 22:42:49 +00:00
|
|
|
.I /lib
|
|
|
|
and
|
|
|
|
.I /usr/lib
|
2004-11-03 13:51:07 +00:00
|
|
|
are searched (in that order).
|
|
|
|
.PP
|
|
|
|
If the library has dependencies on other shared libraries,
|
|
|
|
then these are also automatically loaded by the dynamic linker
|
2007-04-12 22:42:49 +00:00
|
|
|
using the same rules.
|
|
|
|
(This process may occur recursively,
|
2004-11-03 13:51:07 +00:00
|
|
|
if those libraries in turn have dependencies, and so on.)
|
|
|
|
.PP
|
2006-01-14 04:29:47 +00:00
|
|
|
One of the following two values must be included in
|
|
|
|
.IR flag :
|
|
|
|
.TP
|
2004-11-03 13:51:07 +00:00
|
|
|
.B RTLD_LAZY
|
2007-04-12 22:42:49 +00:00
|
|
|
Perform lazy binding.
|
2006-01-15 01:08:56 +00:00
|
|
|
Only resolve symbols as the code that references them is executed.
|
2006-01-14 04:29:47 +00:00
|
|
|
If the symbol is never referenced, then it is never resolved.
|
intro.1, _syscall.2, access.2, arch_prctl.2, cacheflush.2, chown.2, clock_getres.2, clone.2, create_module.2, fcntl.2, flock.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getpriority.2, getrlimit.2, getrusage.2, ioprio_set.2, kexec_load.2, madvise.2, mbind.2, migrate_pages.2, mknod.2, mmap.2, mount.2, move_pages.2, mprotect.2, open.2, pause.2, pciconfig_read.2, perf_event_open.2, prctl.2, ptrace.2, query_module.2, read.2, reboot.2, recv.2, s390_runtime_instr.2, sched_setscheduler.2, select_tut.2, send.2, set_mempolicy.2, setfsgid.2, setfsuid.2, sigaction.2, spu_create.2, spu_run.2, stime.2, swapon.2, syslog.2, timer_create.2, timer_getoverrun.2, times.2, tkill.2, umount.2, unimplemented.2, ustat.2, vm86.2, wait.2, abs.3, aio_read.3, aio_write.3, bsd_signal.3, catgets.3, clearenv.3, cmsg.3, dbopen.3, dirfd.3, dlopen.3, exec.3, fenv.3, ferror.3, fmemopen.3, fnmatch.3, fopen.3, futimes.3, getaddrinfo.3, getifaddrs.3, getipnodebyname.3, hsearch.3, if_nameindex.3, inet_pton.3, mblen.3, mbrlen.3, mbsrtowcs.3, mbtowc.3, mcheck.3, memfrob.3, mq_notify.3, netlink.3, posix_memalign.3, printf.3, pthread_attr_setscope.3, pthread_cleanup_push.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setcancelstate.3, pthread_setconcurrency.3, raise.3, resolver.3, rpc.3, rtime.3, rtnetlink.3, scanf.3, setbuf.3, setnetgrent.3, shm_open.3, sigpause.3, sigset.3, sigwait.3, sockatmark.3, strcasecmp.3, strcmp.3, strdup.3, strftime.3, strptime.3, strsignal.3, strverscmp.3, sysv_signal.3, termios.3, wcrtomb.3, wcsnlen.3, wcsnrtombs.3, wcsrtombs.3, wctomb.3, wprintf.3, console_codes.4, cpuid.4, msr.4, rtc.4, sk98lin.4, st.4, tty.4, charmap.5, core.5, elf.5, hosts.equiv.5, proc.5, resolv.conf.5, services.5, slabinfo.5, arp.7, bootparam.7, capabilities.7, charsets.7, cpuset.7, ddp.7, epoll.7, feature_test_macros.7, futex.7, hier.7, icmp.7, inotify.7, ip.7, ipv6.7, man-pages.7, mdoc.7, mdoc.samples.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, posixoptions.7, pthreads.7, raw.7, rtld-audit.7, rtnetlink.7, sem_overview.7, sigevent.7, socket.7, spufs.7, tcp.7, udp.7, unicode.7, uri.7, utf-8.7, intro.8, ldconfig.8, sync.8: Global fix: fix placement of word "only"
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-31 08:53:00 +00:00
|
|
|
(Lazy binding is performed only for function references;
|
2006-01-14 04:29:47 +00:00
|
|
|
references to variables are always immediately bound when
|
|
|
|
the library is loaded.)
|
|
|
|
.TP
|
2004-11-03 13:51:07 +00:00
|
|
|
.B RTLD_NOW
|
2006-01-14 04:29:47 +00:00
|
|
|
If this value is specified, or the environment variable
|
2004-11-03 13:51:07 +00:00
|
|
|
.B LD_BIND_NOW
|
mbind.2, rename.2, sched_setscheduler.2, set_mempolicy.2, syslog.2, argz_add.3, dlopen.3, scanf.3, strtod.3, strtok.3, tcgetpgrp.3, hd.4, cpuset.7, regex.7, ld.so.8: Global fix: s/non-empty/nonempty/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:41:47 +00:00
|
|
|
is set to a nonempty string,
|
2004-11-03 13:51:07 +00:00
|
|
|
all undefined symbols in the library are resolved before
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen ()
|
2007-04-12 22:42:49 +00:00
|
|
|
returns.
|
|
|
|
If this cannot be done, an error is returned.
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
2009-12-31 17:16:00 +00:00
|
|
|
Zero or more of the following values may also be ORed in
|
2006-01-14 04:29:47 +00:00
|
|
|
.IR flag :
|
|
|
|
.TP
|
2004-11-03 13:51:07 +00:00
|
|
|
.B RTLD_GLOBAL
|
2006-01-15 01:08:56 +00:00
|
|
|
The symbols defined by this library will be
|
2004-11-03 13:51:07 +00:00
|
|
|
made available for symbol resolution of subsequently loaded libraries.
|
2007-04-12 22:42:49 +00:00
|
|
|
.TP
|
2006-01-14 04:29:47 +00:00
|
|
|
.B RTLD_LOCAL
|
2007-04-12 22:42:49 +00:00
|
|
|
This is the converse of
|
2006-01-14 04:29:47 +00:00
|
|
|
.BR RTLD_GLOBAL ,
|
|
|
|
and the default if neither flag is specified.
|
|
|
|
Symbols defined in this library are not made available to resolve
|
|
|
|
references in subsequently loaded libraries.
|
|
|
|
.TP
|
2006-05-31 22:16:55 +00:00
|
|
|
.BR RTLD_NODELETE " (since glibc 2.2)"
|
2006-01-14 04:29:47 +00:00
|
|
|
Do not unload the library during
|
|
|
|
.BR dlclose ().
|
2007-06-08 09:56:56 +00:00
|
|
|
Consequently, the library's static variables are not reinitialized
|
2007-04-12 22:42:49 +00:00
|
|
|
if the library is reloaded with
|
2006-01-14 04:29:47 +00:00
|
|
|
.BR dlopen ()
|
|
|
|
at a later time.
|
|
|
|
This flag is not specified in POSIX.1-2001.
|
|
|
|
.\" (But it is present on Solaris.)
|
|
|
|
.TP
|
2006-05-31 22:16:55 +00:00
|
|
|
.BR RTLD_NOLOAD " (since glibc 2.2)"
|
2006-01-14 04:29:47 +00:00
|
|
|
Don't load the library.
|
|
|
|
This can be used to test if the library is already resident
|
|
|
|
.RB ( dlopen ()
|
|
|
|
returns NULL if it is not, or the library's handle if it is resident).
|
2007-04-12 22:42:49 +00:00
|
|
|
This flag can also be used to promote the flags on a library
|
2006-01-14 04:29:47 +00:00
|
|
|
that is already loaded.
|
|
|
|
For example, a library that was previously loaded with
|
|
|
|
.B RTLD_LOCAL
|
close.2, epoll_create.2, epoll_ctl.2, fcntl.2, madvise.2, mmap.2, mremap.2, select_tut.2, setgid.2, setuid.2, syscalls.2, vmsplice.2, dlopen.3, fts.3, getpw.3, stdio.3, fd.4, initrd.4, random.4, sd.4, bootparam.7, capabilities.7, cpuset.7, epoll.7, inotify.7, man.7, socket.7, x25.7: Global fix: s/re-/re/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "re-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 17:45:23 +00:00
|
|
|
can be reopened with
|
2006-01-14 04:29:47 +00:00
|
|
|
.BR RTLD_NOLOAD\ |\ RTLD_GLOBAL .
|
|
|
|
This flag is not specified in POSIX.1-2001.
|
|
|
|
.\" (But it is present on Solaris.)
|
|
|
|
.\"
|
2006-01-14 05:14:39 +00:00
|
|
|
.TP
|
|
|
|
.BR RTLD_DEEPBIND " (since glibc 2.3.4)"
|
2007-04-12 22:42:49 +00:00
|
|
|
.\" Inimitably described by UD in
|
2006-01-15 01:08:56 +00:00
|
|
|
.\" http://sources.redhat.com/ml/libc-hacker/2004-09/msg00083.html.
|
2007-04-12 22:42:49 +00:00
|
|
|
Place the lookup scope of the symbols in this
|
|
|
|
library ahead of the global scope.
|
|
|
|
This means that a self-contained library will use
|
|
|
|
its own symbols in preference to global symbols with the same name
|
2006-01-14 05:14:39 +00:00
|
|
|
contained in libraries that have already been loaded.
|
|
|
|
This flag is not specified in POSIX.1-2001.
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
|
|
|
If
|
|
|
|
.I filename
|
epoll_ctl.2, execve.2, recv.2, timer_create.2, wait.2, argz_add.3, basename.3, dlopen.3, exec.3, fopencookie.3, fts.3, getaddrinfo.3, getcwd.3, gethostbyname.3, getifaddrs.3, getipnodebyname.3, getlogin.3, getnetent.3, getprotoent.3, getrpcent.3, getservent.3, getusershell.3, glob.3, if_nameindex.3, inet_ntop.3, lio_listio.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mq_notify.3, ptsname.3, realpath.3, setnetgrent.3, sigvec.3, strsignal.3, strtok.3, wcrtomb.3, wcsnrtombs.3, wcsrtombs.3, wcstombs.3, xdr.3: Global fix of "NULL pointer"
Change "NULL pointer: to "NUL " or null pointer".
POSIX uses the term "null pointer", not "NULL pointer".
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-01-03 02:01:50 +00:00
|
|
|
is NULL, then the returned handle is for the main program.
|
2004-11-03 13:51:07 +00:00
|
|
|
When given to
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlsym (),
|
2004-11-03 13:51:07 +00:00
|
|
|
this handle causes a search for a symbol in the main program,
|
|
|
|
followed by all shared libraries loaded at program startup,
|
2007-04-12 22:42:49 +00:00
|
|
|
and then all shared libraries loaded by
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen ()
|
2004-11-03 13:51:07 +00:00
|
|
|
with the flag
|
2005-07-19 15:36:19 +00:00
|
|
|
.BR RTLD_GLOBAL .
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
|
|
|
External references in the library are resolved using the libraries
|
|
|
|
in that library's dependency list and any other libraries previously
|
2007-04-12 22:42:49 +00:00
|
|
|
opened with the
|
2004-11-03 13:51:07 +00:00
|
|
|
.B RTLD_GLOBAL
|
|
|
|
flag.
|
2005-07-06 12:57:38 +00:00
|
|
|
If the executable was linked with the flag "\-rdynamic"
|
|
|
|
(or, synonymously, "\-\-export\-dynamic"),
|
2004-11-03 13:51:07 +00:00
|
|
|
then the global symbols in the executable will also be used
|
|
|
|
to resolve references in a dynamically loaded library.
|
|
|
|
.PP
|
|
|
|
If the same library is loaded again with
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen (),
|
2007-04-12 22:42:49 +00:00
|
|
|
the same file handle is returned.
|
|
|
|
The dl library maintains reference
|
2004-11-03 13:51:07 +00:00
|
|
|
counts for library handles, so a dynamic library is not
|
|
|
|
deallocated until
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlclose ()
|
2004-11-03 13:51:07 +00:00
|
|
|
has been called on it as many times as
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen ()
|
2007-04-12 22:42:49 +00:00
|
|
|
has succeeded on it.
|
|
|
|
The
|
2007-06-15 21:40:11 +00:00
|
|
|
.BR _init ()
|
intro.1, _syscall.2, access.2, arch_prctl.2, cacheflush.2, chown.2, clock_getres.2, clone.2, create_module.2, fcntl.2, flock.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getpriority.2, getrlimit.2, getrusage.2, ioprio_set.2, kexec_load.2, madvise.2, mbind.2, migrate_pages.2, mknod.2, mmap.2, mount.2, move_pages.2, mprotect.2, open.2, pause.2, pciconfig_read.2, perf_event_open.2, prctl.2, ptrace.2, query_module.2, read.2, reboot.2, recv.2, s390_runtime_instr.2, sched_setscheduler.2, select_tut.2, send.2, set_mempolicy.2, setfsgid.2, setfsuid.2, sigaction.2, spu_create.2, spu_run.2, stime.2, swapon.2, syslog.2, timer_create.2, timer_getoverrun.2, times.2, tkill.2, umount.2, unimplemented.2, ustat.2, vm86.2, wait.2, abs.3, aio_read.3, aio_write.3, bsd_signal.3, catgets.3, clearenv.3, cmsg.3, dbopen.3, dirfd.3, dlopen.3, exec.3, fenv.3, ferror.3, fmemopen.3, fnmatch.3, fopen.3, futimes.3, getaddrinfo.3, getifaddrs.3, getipnodebyname.3, hsearch.3, if_nameindex.3, inet_pton.3, mblen.3, mbrlen.3, mbsrtowcs.3, mbtowc.3, mcheck.3, memfrob.3, mq_notify.3, netlink.3, posix_memalign.3, printf.3, pthread_attr_setscope.3, pthread_cleanup_push.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setcancelstate.3, pthread_setconcurrency.3, raise.3, resolver.3, rpc.3, rtime.3, rtnetlink.3, scanf.3, setbuf.3, setnetgrent.3, shm_open.3, sigpause.3, sigset.3, sigwait.3, sockatmark.3, strcasecmp.3, strcmp.3, strdup.3, strftime.3, strptime.3, strsignal.3, strverscmp.3, sysv_signal.3, termios.3, wcrtomb.3, wcsnlen.3, wcsnrtombs.3, wcsrtombs.3, wctomb.3, wprintf.3, console_codes.4, cpuid.4, msr.4, rtc.4, sk98lin.4, st.4, tty.4, charmap.5, core.5, elf.5, hosts.equiv.5, proc.5, resolv.conf.5, services.5, slabinfo.5, arp.7, bootparam.7, capabilities.7, charsets.7, cpuset.7, ddp.7, epoll.7, feature_test_macros.7, futex.7, hier.7, icmp.7, inotify.7, ip.7, ipv6.7, man-pages.7, mdoc.7, mdoc.samples.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, posixoptions.7, pthreads.7, raw.7, rtld-audit.7, rtnetlink.7, sem_overview.7, sigevent.7, socket.7, spufs.7, tcp.7, udp.7, unicode.7, uri.7, utf-8.7, intro.8, ldconfig.8, sync.8: Global fix: fix placement of word "only"
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-31 08:53:00 +00:00
|
|
|
routine, if present, is called only once.
|
2007-04-12 22:42:49 +00:00
|
|
|
But a subsequent call with
|
2004-11-03 13:51:07 +00:00
|
|
|
.B RTLD_NOW
|
|
|
|
may force symbol resolution for a library earlier loaded with
|
|
|
|
.BR RTLD_LAZY .
|
|
|
|
.PP
|
|
|
|
If
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen ()
|
2004-11-03 13:51:07 +00:00
|
|
|
fails for any reason, it returns NULL.
|
intro.1, time.1, _syscall.2, accept.2, capget.2, clone.2, execve.2, fcntl.2, intro.2, ioctl_list.2, ioprio_set.2, kill.2, mlock.2, nanosleep.2, perf_event_open.2, select.2, stat.2, times.2, ustat.2, vfork.2, wait.2, cfree.3, dbopen.3, dlopen.3, fenv.3, fmtmsg.3, gamma.3, getaddrinfo.3, gethostbyname.3, getnameinfo.3, getspnam.3, login.3, printf.3, regex.3, stdio.3, sysconf.3, termios.3, ttyslot.3, undocumented.3, wordexp.3, console_codes.4, initrd.4, mouse.4, random.4, st.4, tty_ioctl.4, wavelan.4, charmap.5, dir_colors.5, hosts.5, termcap.5, armscii-8.7, boot.7, bootparam.7, capabilities.7, charsets.7, ddp.7, futex.7, glob.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, man.7, numa.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, rtnetlink.7, signal.7, time.7, udp.7, udplite.7, unicode.7, uri.7, utf-8.7: G;lobal fix: remove unneeded double quotes in .SS headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:02:18 +00:00
|
|
|
.SS dlsym()
|
2004-11-03 13:51:07 +00:00
|
|
|
The function
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlsym ()
|
2007-04-12 22:42:49 +00:00
|
|
|
takes a "handle" of a dynamic library returned by
|
2006-01-13 02:09:44 +00:00
|
|
|
.BR dlopen ()
|
|
|
|
and the
|
|
|
|
null-terminated symbol name, returning the address where that symbol is
|
2007-04-12 22:42:49 +00:00
|
|
|
loaded into memory.
|
|
|
|
If the symbol is not found, in the specified
|
2004-11-03 13:51:07 +00:00
|
|
|
library or any of the libraries that were automatically loaded by
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen ()
|
2004-11-03 13:51:07 +00:00
|
|
|
when that library was loaded,
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlsym ()
|
2004-11-03 13:51:07 +00:00
|
|
|
returns NULL.
|
|
|
|
(The search performed by
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlsym ()
|
2004-11-03 13:51:07 +00:00
|
|
|
is breadth first through the dependency tree of these libraries.)
|
|
|
|
Since the value of the symbol could actually be NULL (so that a
|
|
|
|
NULL return from
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlsym ()
|
2004-11-03 13:51:07 +00:00
|
|
|
need not indicate an error), the correct way to test for an error
|
|
|
|
is to call
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlerror ()
|
2004-11-03 13:51:07 +00:00
|
|
|
to clear any old error conditions, then call
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlsym (),
|
2004-11-03 13:51:07 +00:00
|
|
|
and then call
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlerror ()
|
2004-11-03 13:51:07 +00:00
|
|
|
again, saving its return value into a variable, and check whether
|
|
|
|
this saved value is not NULL.
|
|
|
|
.PP
|
|
|
|
There are two special pseudo-handles,
|
|
|
|
.B RTLD_DEFAULT
|
|
|
|
and
|
|
|
|
.BR RTLD_NEXT .
|
|
|
|
The former will find the first occurrence of the desired symbol
|
2007-04-12 22:42:49 +00:00
|
|
|
using the default library search order.
|
|
|
|
The latter
|
2004-11-03 13:51:07 +00:00
|
|
|
will find the next occurrence of a function in the search order
|
2007-04-12 22:42:49 +00:00
|
|
|
after the current library.
|
|
|
|
This allows one to provide a wrapper
|
2004-11-03 13:51:07 +00:00
|
|
|
around a function in another shared library.
|
intro.1, time.1, _syscall.2, accept.2, capget.2, clone.2, execve.2, fcntl.2, intro.2, ioctl_list.2, ioprio_set.2, kill.2, mlock.2, nanosleep.2, perf_event_open.2, select.2, stat.2, times.2, ustat.2, vfork.2, wait.2, cfree.3, dbopen.3, dlopen.3, fenv.3, fmtmsg.3, gamma.3, getaddrinfo.3, gethostbyname.3, getnameinfo.3, getspnam.3, login.3, printf.3, regex.3, stdio.3, sysconf.3, termios.3, ttyslot.3, undocumented.3, wordexp.3, console_codes.4, initrd.4, mouse.4, random.4, st.4, tty_ioctl.4, wavelan.4, charmap.5, dir_colors.5, hosts.5, termcap.5, armscii-8.7, boot.7, bootparam.7, capabilities.7, charsets.7, ddp.7, futex.7, glob.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, man.7, numa.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, rtnetlink.7, signal.7, time.7, udp.7, udplite.7, unicode.7, uri.7, utf-8.7: G;lobal fix: remove unneeded double quotes in .SS headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:02:18 +00:00
|
|
|
.SS dlclose()
|
2004-11-03 13:51:07 +00:00
|
|
|
The function
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlclose ()
|
2004-11-03 13:51:07 +00:00
|
|
|
decrements the reference count on the dynamic library handle
|
|
|
|
.IR handle .
|
|
|
|
If the reference count drops to zero and no other loaded libraries use
|
|
|
|
symbols in it, then the dynamic library is unloaded.
|
|
|
|
.LP
|
|
|
|
The function
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlclose ()
|
intro.1, time.1, adjtimex.2, capget.2, eventfd.2, fcntl.2, getrlimit.2, getsockopt.2, gettimeofday.2, intro.2, ioctl_list.2, ioperm.2, mlock.2, pivot_root.2, poll.2, prctl.2, ptrace.2, sched_setscheduler.2, select_tut.2, semget.2, sigaltstack.2, signalfd.2, sysctl.2, timer_settime.2, timerfd_create.2, wait.2, CPU_SET.3, argz_add.3, assert_perror.3, atexit.3, backtrace.3, bcmp.3, clearenv.3, ctime.3, dl_iterate_phdr.3, dlopen.3, ecvt.3, errno.3, error.3, ether_aton.3, exit.3, fenv.3, ferror.3, finite.3, flockfile.3, fnmatch.3, fpathconf.3, fpclassify.3, ftime.3, ftok.3, ftw.3, fwide.3, getaddrinfo.3, gethostbyname.3, getlogin.3, getnameinfo.3, getnetent.3, getopt.3, getprotoent.3, getrpcent.3, getservent.3, glob.3, hsearch.3, inet.3, isalpha.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, longjmp.3, lsearch.3, malloc.3, matherr.3, mblen.3, mbsinit.3, mbtowc.3, on_exit.3, printf.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_equal.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setschedparam.3, pthread_setschedprio.3, ptsname.3, putenv.3, putgrent.3, raise.3, rcmd.3, regex.3, rexec.3, rpc.3, rpmatch.3, rtnetlink.3, scandir.3, sem_init.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, signbit.3, stdio_ext.3, strtod.3, strtol.3, strtoul.3, system.3, termios.3, timeradd.3, tzset.3, ualarm.3, wctomb.3, xdr.3, st.4, tty_ioctl.4, core.5, elf.5, proc.5, bootparam.7, capabilities.7, icmp.7, ip.7, ipv6.7, math_error.7, mdoc.samples.7, mq_overview.7, pthreads.7, raw.7, regex.7, socket.7, tcp.7, tzselect.8: Global fix: s/non-zero/nonzero/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:40:55 +00:00
|
|
|
returns 0 on success, and nonzero on error.
|
intro.1, time.1, _syscall.2, accept.2, capget.2, clone.2, execve.2, fcntl.2, intro.2, ioctl_list.2, ioprio_set.2, kill.2, mlock.2, nanosleep.2, perf_event_open.2, select.2, stat.2, times.2, ustat.2, vfork.2, wait.2, cfree.3, dbopen.3, dlopen.3, fenv.3, fmtmsg.3, gamma.3, getaddrinfo.3, gethostbyname.3, getnameinfo.3, getspnam.3, login.3, printf.3, regex.3, stdio.3, sysconf.3, termios.3, ttyslot.3, undocumented.3, wordexp.3, console_codes.4, initrd.4, mouse.4, random.4, st.4, tty_ioctl.4, wavelan.4, charmap.5, dir_colors.5, hosts.5, termcap.5, armscii-8.7, boot.7, bootparam.7, capabilities.7, charsets.7, ddp.7, futex.7, glob.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, man.7, numa.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, rtnetlink.7, signal.7, time.7, udp.7, udplite.7, unicode.7, uri.7, utf-8.7: G;lobal fix: remove unneeded double quotes in .SS headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:02:18 +00:00
|
|
|
.SS The obsolete symbols _init() and _fini()
|
2004-11-03 13:51:07 +00:00
|
|
|
The linker recognizes special symbols
|
|
|
|
.B _init
|
|
|
|
and
|
|
|
|
.BR _fini .
|
|
|
|
If a dynamic library exports a routine named
|
2007-06-15 21:40:11 +00:00
|
|
|
.BR _init (),
|
2004-11-03 13:51:07 +00:00
|
|
|
then that code is executed after the loading, before
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlopen ()
|
2007-04-12 22:42:49 +00:00
|
|
|
returns.
|
|
|
|
If the dynamic library exports a routine named
|
2007-06-15 21:40:11 +00:00
|
|
|
.BR _fini (),
|
2004-11-03 13:51:07 +00:00
|
|
|
then that routine is called just before the library is unloaded.
|
2008-07-01 14:15:13 +00:00
|
|
|
In case you need to avoid linking against the system startup files,
|
2007-06-15 21:40:11 +00:00
|
|
|
this can be done by using the
|
|
|
|
.BR gcc (1)
|
2007-10-12 06:43:45 +00:00
|
|
|
.I \-nostartfiles
|
2007-06-15 21:40:11 +00:00
|
|
|
command-line option.
|
2004-11-03 13:51:07 +00:00
|
|
|
.LP
|
|
|
|
Using these routines, or the gcc
|
2005-07-20 07:53:07 +00:00
|
|
|
.B \-nostartfiles
|
2004-11-03 13:51:07 +00:00
|
|
|
or
|
|
|
|
.B \-nostdlib
|
2007-04-12 22:42:49 +00:00
|
|
|
options, is not recommended.
|
|
|
|
Their use may result in undesired behavior,
|
2004-11-03 13:51:07 +00:00
|
|
|
since the constructor/destructor routines will not be executed
|
|
|
|
(unless special measures are taken).
|
|
|
|
.\" void _init(void) __attribute__((constructor));
|
|
|
|
.\" void _fini(void) __attribute__((destructor));
|
|
|
|
.LP
|
|
|
|
Instead, libraries should export routines using the
|
2007-09-20 16:26:31 +00:00
|
|
|
.B __attribute__((constructor))
|
2004-11-03 13:51:07 +00:00
|
|
|
and
|
2007-09-20 16:26:31 +00:00
|
|
|
.B __attribute__((destructor))
|
2007-04-12 22:42:49 +00:00
|
|
|
function attributes.
|
|
|
|
See the gcc info pages for information on these.
|
2004-11-03 13:51:07 +00:00
|
|
|
Constructor routines are executed before
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR dlopen ()
|
2004-11-03 13:51:07 +00:00
|
|
|
returns, and destructor routines are executed before
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR dlclose ()
|
2004-11-03 13:51:07 +00:00
|
|
|
returns.
|
2007-05-18 12:19:07 +00:00
|
|
|
.SS Glibc extensions: dladdr() and dlvsym()
|
2004-11-03 13:51:07 +00:00
|
|
|
Glibc adds two functions not described by POSIX, with prototypes
|
|
|
|
.sp
|
|
|
|
.nf
|
getresuid.2, mremap.2, poll.2, remap_file_pages.2, setresuid.2, splice.2, sync_file_range.2, syscall.2, tee.2, vmsplice.2, INFINITY.3, aio_init.3, asprintf.3, assert_perror.3, basename.3, bsd_signal.3, canonicalize_file_name.3, clog10.3, crypt.3, dl_iterate_phdr.3, dlopen.3, encrypt.3, exp10.3, fcloseall.3, fenv.3, fopencookie.3, ftw.3, getaddrinfo_a.3, getloadavg.3, getutent.3, grantpt.3, hsearch.3, lseek64.3, memmem.3, mempcpy.3, pow10.3, program_invocation_name.3, ptsname.3, putgrent.3, sched_getcpu.3, sincos.3, strchr.3, strfry.3, strnlen.3, strptime.3, strstr.3, strverscmp.3, swab.3, sysv_signal.3, tsearch.3, unlockpt.3, wcwidth.3: Add reference to feature_test_macros(7)
Some pages simply list feature test macro requirements in
the form:
#define #GNU_SOURCE
#include <someheader.h>
For these pages, add a "See feature_test_macros(7)" comment
on the "#define" line.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-10-31 04:31:47 +00:00
|
|
|
.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
|
2004-11-03 13:51:07 +00:00
|
|
|
.B #include <dlfcn.h>
|
|
|
|
.sp
|
|
|
|
.BI "int dladdr(void *" addr ", Dl_info *" info );
|
|
|
|
.sp
|
|
|
|
.BI "void *dlvsym(void *" handle ", char *" symbol ", char *" version );
|
|
|
|
.fi
|
|
|
|
.PP
|
|
|
|
The function
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dladdr ()
|
2004-11-03 13:51:07 +00:00
|
|
|
takes a function pointer and tries to resolve name
|
2007-04-12 22:42:49 +00:00
|
|
|
and file where it is located.
|
|
|
|
Information is stored in the
|
2007-06-15 21:40:11 +00:00
|
|
|
.I Dl_info
|
|
|
|
structure:
|
2004-11-03 13:51:07 +00:00
|
|
|
.sp
|
2007-12-19 06:57:44 +00:00
|
|
|
.in +4n
|
2004-11-03 13:51:07 +00:00
|
|
|
.nf
|
|
|
|
typedef struct {
|
2008-05-05 20:28:44 +00:00
|
|
|
const char *dli_fname; /* Pathname of shared object that
|
|
|
|
contains address */
|
|
|
|
void *dli_fbase; /* Address at which shared object
|
|
|
|
is loaded */
|
2014-01-08 01:07:34 +00:00
|
|
|
const char *dli_sname; /* Name of symbol whose definition
|
|
|
|
overlaps \fIaddr\fP */
|
2008-05-05 20:28:44 +00:00
|
|
|
void *dli_saddr; /* Exact address of symbol named
|
|
|
|
in \fIdli_sname\fP */
|
2004-11-03 13:51:07 +00:00
|
|
|
} Dl_info;
|
|
|
|
.fi
|
2007-06-15 21:40:11 +00:00
|
|
|
.in
|
2008-05-05 20:28:44 +00:00
|
|
|
.PP
|
|
|
|
If no symbol matching
|
|
|
|
.I addr
|
|
|
|
could be found, then
|
|
|
|
.I dli_sname
|
|
|
|
and
|
|
|
|
.I dli_saddr
|
|
|
|
are set to NULL.
|
|
|
|
.PP
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dladdr ()
|
intro.1, time.1, adjtimex.2, capget.2, eventfd.2, fcntl.2, getrlimit.2, getsockopt.2, gettimeofday.2, intro.2, ioctl_list.2, ioperm.2, mlock.2, pivot_root.2, poll.2, prctl.2, ptrace.2, sched_setscheduler.2, select_tut.2, semget.2, sigaltstack.2, signalfd.2, sysctl.2, timer_settime.2, timerfd_create.2, wait.2, CPU_SET.3, argz_add.3, assert_perror.3, atexit.3, backtrace.3, bcmp.3, clearenv.3, ctime.3, dl_iterate_phdr.3, dlopen.3, ecvt.3, errno.3, error.3, ether_aton.3, exit.3, fenv.3, ferror.3, finite.3, flockfile.3, fnmatch.3, fpathconf.3, fpclassify.3, ftime.3, ftok.3, ftw.3, fwide.3, getaddrinfo.3, gethostbyname.3, getlogin.3, getnameinfo.3, getnetent.3, getopt.3, getprotoent.3, getrpcent.3, getservent.3, glob.3, hsearch.3, inet.3, isalpha.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, longjmp.3, lsearch.3, malloc.3, matherr.3, mblen.3, mbsinit.3, mbtowc.3, on_exit.3, printf.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_equal.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setschedparam.3, pthread_setschedprio.3, ptsname.3, putenv.3, putgrent.3, raise.3, rcmd.3, regex.3, rexec.3, rpc.3, rpmatch.3, rtnetlink.3, scandir.3, sem_init.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, signbit.3, stdio_ext.3, strtod.3, strtol.3, strtoul.3, system.3, termios.3, timeradd.3, tzset.3, ualarm.3, wctomb.3, xdr.3, st.4, tty_ioctl.4, core.5, elf.5, proc.5, bootparam.7, capabilities.7, icmp.7, ip.7, ipv6.7, math_error.7, mdoc.samples.7, mq_overview.7, pthreads.7, raw.7, regex.7, socket.7, tcp.7, tzselect.8: Global fix: s/non-zero/nonzero/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:40:55 +00:00
|
|
|
returns 0 on error, and nonzero on success.
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
|
|
|
The function
|
2008-06-11 13:43:34 +00:00
|
|
|
.BR dlvsym (),
|
|
|
|
provided by glibc since version 2.1,
|
2004-11-03 13:51:07 +00:00
|
|
|
does the same as
|
2005-07-19 16:23:19 +00:00
|
|
|
.BR dlsym ()
|
|
|
|
but takes a version string as an additional argument.
|
getent.1, intro.1, time.1, _exit.2, _syscall.2, accept.2, access.2, acct.2, adjtimex.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bdflush.2, bind.2, brk.2, cacheflush.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, clone.2, close.2, connect.2, create_module.2, delete_module.2, dup.2, epoll_create.2, epoll_ctl.2, epoll_wait.2, eventfd.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, flock.2, fork.2, fstatat.2, fsync.2, futex.2, futimesat.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getitimer.2, getpagesize.2, getpeername.2, getpid.2, getpriority.2, getresuid.2, getrlimit.2, getrusage.2, getsid.2, getsockname.2, getsockopt.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, getxattr.2, idle.2, init_module.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, intro.2, io_cancel.2, io_destroy.2, io_getevents.2, io_setup.2, io_submit.2, ioctl.2, ioctl_list.2, ioperm.2, iopl.2, ioprio_set.2, ipc.2, kcmp.2, kill.2, killpg.2, link.2, linkat.2, listen.2, listxattr.2, llseek.2, lookup_dcookie.2, lseek.2, madvise.2, migrate_pages.2, mincore.2, mkdir.2, mkdirat.2, mknod.2, mknodat.2, mlock.2, mmap.2, mmap2.2, modify_ldt.2, mount.2, move_pages.2, mprotect.2, mq_getsetattr.2, mremap.2, msgctl.2, msgget.2, msgop.2, msync.2, nanosleep.2, nfsservctl.2, nice.2, open.2, openat.2, outb.2, pause.2, pciconfig_read.2, perf_event_open.2, perfmonctl.2, personality.2, pipe.2, pivot_root.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, ptrace.2, query_module.2, quotactl.2, read.2, readahead.2, readdir.2, readlink.2, readlinkat.2, readv.2, reboot.2, recv.2, remap_file_pages.2, removexattr.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, select.2, semctl.2, semget.2, semop.2, send.2, sendfile.2, set_thread_area.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setpgid.2, setresuid.2, setreuid.2, setsid.2, setuid.2, setup.2, setxattr.2, shmctl.2, shmget.2, shmop.2, shutdown.2, sigaction.2, sigaltstack.2, signal.2, signalfd.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, socket.2, socketcall.2, socketpair.2, splice.2, stat.2, statfs.2, stime.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, sysctl.2, sysfs.2, sysinfo.2, syslog.2, tee.2, time.2, timerfd_create.2, times.2, tkill.2, truncate.2, umask.2, umount.2, uname.2, unimplemented.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, MB_CUR_MAX.3, MB_LEN_MAX.3, __setfpucw.3, a64l.3, abort.3, abs.3, acos.3, acosh.3, addseverity.3, adjtime.3, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, alloca.3, argz_add.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, backtrace.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, btowc.3, btree.3, byteorder.3, bzero.3, cabs.3, cacos.3, cacosh.3, canonicalize_file_name.3, carg.3, casin.3, casinh.3, catan.3, catanh.3, catgets.3, catopen.3, cbrt.3, ccos.3, ccosh.3, ceil.3, cerf.3, cexp.3, cexp2.3, cfree.3, cimag.3, clearenv.3, clock.3, clock_getcpuclockid.3, clog.3, clog10.3, clog2.3, closedir.3, cmsg.3, confstr.3, conj.3, copysign.3, cos.3, cosh.3, cpow.3, cproj.3, creal.3, crypt.3, csin.3, csinh.3, csqrt.3, ctan.3, ctanh.3, ctermid.3, ctime.3, daemon.3, dbopen.3, des_crypt.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dlopen.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, encrypt.3, end.3, endian.3, envz_add.3, erf.3, erfc.3, err.3, errno.3, error.3, ether_aton.3, euidaccess.3, exec.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fclose.3, fcloseall.3, fdim.3, fenv.3, ferror.3, fexecve.3, fflush.3, ffs.3, fgetgrent.3, fgetpwent.3, fgetwc.3, fgetws.3, finite.3, flockfile.3, floor.3, fma.3, fmax.3, fmemopen.3, fmin.3, fmod.3, fmtmsg.3, fnmatch.3, fopen.3, fpathconf.3, fpclassify.3, fpurge.3, fputwc.3, fputws.3, fread.3, frexp.3, fseek.3, fseeko.3, ftime.3, ftok.3, fts.3, ftw.3, futimes.3, fwide.3, gamma.3, gcvt.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrent_r.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getipnodebyname.3, getline.3, getloadavg.3, getlogin.3, getmntent.3, getnameinfo.3, getnetent.3, getnetent_r.3, getopt.3, getpass.3, getprotoent.3, getprotoent_r.3, getpt.3, getpw.3, getpwent.3, getpwent_r.3, getpwnam.3, getrpcent.3, getrpcent_r.3, getrpcport.3, gets.3, getservent.3, getservent_r.3, getspnam.3, getttyent.3, getumask.3, getusershell.3, getutent.3, getw.3, getwchar.3, glob.3, grantpt.3, gsignal.3, hash.3, hsearch.3, hypot.3, iconv.3, iconv_close.3, iconv_open.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, isgreater.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, j0.3, key_setsecret.3, ldexp.3, lgamma.3, lio_listio.3, localeconv.3, lockf.3, log.3, log10.3, log1p.3, log2.3, logb.3, login.3, longjmp.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, malloc.3, malloc_hook.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mbtowc.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, mempcpy.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mpool.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, nan.3, netlink.3, nextafter.3, nl_langinfo.3, offsetof.3, on_exit.3, opendir.3, openpty.3, perror.3, popen.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, printf.3, profil.3, program_invocation_name.3, psignal.3, pthread_kill_other_threads_np.3, ptsname.3, putenv.3, putgrent.3, putpwent.3, puts.3, putwchar.3, qecvt.3, qsort.3, queue.3, raise.3, rand.3, random.3, random_r.3, rcmd.3, re_comp.3, readdir.3, realpath.3, recno.3, regex.3, remainder.3, remove.3, remquo.3, resolver.3, rewinddir.3, rexec.3, rint.3, round.3, rpc.3, rpmatch.3, rtime.3, rtnetlink.3, scalb.3, scalbln.3, scandir.3, scandirat.3, scanf.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, setlocale.3, setlogmask.3, setnetgrent.3, shm_open.3, siginterrupt.3, signbit.3, significand.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sin.3, sincos.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdarg.3, stdin.3, stdio.3, stdio_ext.3, stpcpy.3, stpncpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfmon.3, strfry.3, strftime.3, string.3, strlen.3, strnlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtod.3, strtoimax.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, termios.3, tgamma.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, towctrans.3, towlower.3, towupper.3, trunc.3, tsearch.3, ttyname.3, ttyslot.3, tzset.3, ualarm.3, ulimit.3, ungetwc.3, unlocked_stdio.3, unlockpt.3, updwtmp.3, usleep.3, wcpcpy.3, wcpncpy.3, wcrtomb.3, wcscasecmp.3, wcscat.3, wcschr.3, wcscmp.3, wcscpy.3, wcscspn.3, wcsdup.3, wcslen.3, wcsncasecmp.3, wcsncat.3, wcsncmp.3, wcsncpy.3, wcsnlen.3, wcsnrtombs.3, wcspbrk.3, wcsrchr.3, wcsrtombs.3, wcsspn.3, wcsstr.3, wcstoimax.3, wcstok.3, wcstombs.3, wcswidth.3, wctob.3, wctomb.3, wctrans.3, wctype.3, wcwidth.3, wmemchr.3, wmemcmp.3, wmemcpy.3, wmemmove.3, wmemset.3, wordexp.3, wprintf.3, xcrypt.3, xdr.3, y0.3, cciss.4, console.4, console_codes.4, console_ioctl.4, dsp56k.4, fd.4, full.4, hd.4, hpsa.4, initrd.4, intro.4, lp.4, mem.4, mouse.4, null.4, pts.4, ram.4, random.4, rtc.4, sk98lin.4, st.4, tty.4, ttyS.4, tty_ioctl.4, vcs.4, wavelan.4, acct.5, charmap.5, dir_colors.5, filesystems.5, ftpusers.5, group.5, host.conf.5, hosts.5, hosts.equiv.5, intro.5, issue.5, locale.5, motd.5, networks.5, nologin.5, nscd.conf.5, passwd.5, proc.5, protocols.5, resolv.conf.5, rpc.5, securetty.5, services.5, shells.5, termcap.5, ttytype.5, utmp.5, armscii-8.7, arp.7, ascii.7, bootparam.7, capabilities.7, charsets.7, complex.7, cp1251.7, credentials.7, ddp.7, environ.7, epoll.7, fifo.7, futex.7, glob.7, hier.7, icmp.7, inotify.7, intro.7, ip.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, locale.7, mailaddr.7, man.7, mq_overview.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, raw.7, regex.7, rtld-audit.7, rtnetlink.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, socket.7, standards.7, suffixes.7, svipc.7, tcp.7, termio.7, time.7, udp.7, udplite.7, unicode.7, unix.7, uri.7, utf-8.7, x25.7, nscd.8, sync.8, tzselect.8, zdump.8, zic.8: Global fix: remove unneeded double quotes in .SH headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:01:36 +00:00
|
|
|
.SH CONFORMING TO
|
2007-05-19 04:30:20 +00:00
|
|
|
POSIX.1-2001 describes
|
|
|
|
.BR dlclose (),
|
|
|
|
.BR dlerror (),
|
|
|
|
.BR dlopen (),
|
|
|
|
and
|
|
|
|
.BR dlsym ().
|
|
|
|
.SH NOTES
|
2007-06-22 20:40:07 +00:00
|
|
|
The symbols
|
|
|
|
.B RTLD_DEFAULT
|
|
|
|
and
|
|
|
|
.B RTLD_NEXT
|
|
|
|
are defined by
|
2007-05-19 04:30:20 +00:00
|
|
|
.I <dlfcn.h>
|
2007-06-22 17:42:06 +00:00
|
|
|
only when
|
|
|
|
.B _GNU_SOURCE
|
|
|
|
was defined before including it.
|
2007-05-19 04:30:20 +00:00
|
|
|
.\" .LP
|
|
|
|
.\" The string returned by
|
|
|
|
.\" .BR dlerror ()
|
|
|
|
.\" should not be modified.
|
|
|
|
.\" Some systems give the prototype as
|
|
|
|
.\" .sp
|
|
|
|
.\" .in +5
|
|
|
|
.\" .B "const char *dlerror(void);"
|
|
|
|
.\" .in
|
|
|
|
|
|
|
|
Since glibc 2.2.3,
|
|
|
|
.BR atexit (3)
|
|
|
|
can be used to register an exit handler that is automatically
|
|
|
|
called when a library is unloaded.
|
|
|
|
.SS History
|
|
|
|
The dlopen interface standard comes from SunOS.
|
|
|
|
That system also has
|
|
|
|
.BR dladdr (),
|
|
|
|
but not
|
|
|
|
.BR dlvsym ().
|
2008-12-05 22:45:53 +00:00
|
|
|
.SH BUGS
|
|
|
|
Sometimes, the function pointers you pass to
|
|
|
|
.BR dladdr ()
|
|
|
|
may surprise you.
|
|
|
|
On some architectures (notably i386 and x86_64),
|
|
|
|
.I dli_fname
|
|
|
|
and
|
|
|
|
.I dli_fbase
|
|
|
|
may end up pointing back at the object from which you called
|
|
|
|
.BR dladdr (),
|
|
|
|
even if the function used as an argument should come from
|
|
|
|
a dynamically linked library.
|
|
|
|
.PP
|
|
|
|
The problem is that the function pointer will still be resolved
|
|
|
|
at compile time, but merely point to the
|
|
|
|
.I plt
|
2008-12-06 17:11:51 +00:00
|
|
|
(Procedure Linkage Table)
|
2008-12-05 22:45:53 +00:00
|
|
|
section of the original object (which dispatches the call after
|
|
|
|
asking the dynamic linker to resolve the symbol).
|
2008-12-06 17:11:51 +00:00
|
|
|
To work around this,
|
|
|
|
you can try to compile the code to be position-independent:
|
2008-12-05 23:18:26 +00:00
|
|
|
then, the compiler cannot prepare the pointer
|
2008-12-05 22:45:53 +00:00
|
|
|
at compile time anymore and today's
|
|
|
|
.BR gcc (1)
|
2008-12-06 17:11:51 +00:00
|
|
|
will generate code that just loads the final symbol address from the
|
|
|
|
.I got
|
2008-12-05 22:45:53 +00:00
|
|
|
(Global Offset Table) at run time before passing it to
|
|
|
|
.BR dladdr ().
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH EXAMPLE
|
2006-02-09 20:24:53 +00:00
|
|
|
Load the math library, and print the cosine of 2.0:
|
2004-11-03 13:51:07 +00:00
|
|
|
.nf
|
2006-02-09 20:24:53 +00:00
|
|
|
|
2004-11-03 13:51:07 +00:00
|
|
|
#include <stdio.h>
|
2006-12-04 03:47:56 +00:00
|
|
|
#include <stdlib.h>
|
2004-11-03 13:51:07 +00:00
|
|
|
#include <dlfcn.h>
|
|
|
|
|
2007-04-12 22:42:49 +00:00
|
|
|
int
|
|
|
|
main(int argc, char **argv)
|
2007-04-05 12:36:57 +00:00
|
|
|
{
|
2004-11-03 13:51:07 +00:00
|
|
|
void *handle;
|
|
|
|
double (*cosine)(double);
|
|
|
|
char *error;
|
|
|
|
|
2007-04-05 12:36:57 +00:00
|
|
|
handle = dlopen("libm.so", RTLD_LAZY);
|
2004-11-03 13:51:07 +00:00
|
|
|
if (!handle) {
|
time.1, atexit.3, bsearch.3, dlopen.3, envz_add.3, errno.3, fmtmsg.3, getgrent_r.3, getline.3, getmntent.3, getnameinfo.3, getpass.3, getpwent_r.3, gets.3, isalpha.3, printf.3, puts.3, recno.3, scandir.3, stdarg.3, sysconf.3, termios.3, wordexp.3, null.4, core.5, dir_colors.5, issue.5, proc.5, termcap.5, utmp.5, ascii.7, cpuset.7, glob.7, man-pages.7, man.7, mdoc.7, mdoc.samples.7, regex.7: Revert 9f8e673e623d (whose global s%\\e%\\\\% caused problems)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-09-26 21:56:54 +00:00
|
|
|
fprintf(stderr, "%s\en", dlerror());
|
2007-05-14 21:11:42 +00:00
|
|
|
exit(EXIT_FAILURE);
|
2004-11-03 13:51:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
dlerror(); /* Clear any existing error */
|
2007-06-17 15:23:37 +00:00
|
|
|
|
2014-01-02 01:38:53 +00:00
|
|
|
cosine = (double (*)(double)) dlsym(handle, "cos");
|
2007-06-17 15:23:37 +00:00
|
|
|
|
2014-01-02 09:34:20 +00:00
|
|
|
/* According to the ISO C standard, casting between function
|
2014-01-02 20:58:37 +00:00
|
|
|
pointers and 'void *', as done above, produces undefined results.
|
|
|
|
POSIX.1-2003 and POSIX.1-2008 accepted this state of affairs and
|
|
|
|
proposed the following workaround:
|
2014-01-02 01:38:53 +00:00
|
|
|
|
|
|
|
*(void **) (&cosine) = dlsym(handle, "cos");
|
|
|
|
|
2014-01-02 20:58:37 +00:00
|
|
|
This (clumsy) cast conforms with the ISO C standard and will
|
|
|
|
avoid any compiler warnings.
|
2014-01-02 01:38:53 +00:00
|
|
|
|
2014-01-02 09:34:20 +00:00
|
|
|
The 2013 Technical Corrigendum to POSIX.1-2008 (a.k.a.
|
|
|
|
POSIX.1-2013) improved matters by requiring that conforming
|
|
|
|
implementations support casting 'void *' to a function pointer.
|
|
|
|
Nevertheless, some compilers (e.g., gcc with the '-pedantic'
|
|
|
|
option) may complain about the cast used in this program. */
|
|
|
|
.\" http://pubs.opengroup.org/onlinepubs/009695399/functions/dlsym.html#tag_03_112_08
|
|
|
|
.\" http://pubs.opengroup.org/onlinepubs/9699919799/functions/dlsym.html#tag_16_96_07
|
2014-01-02 10:14:28 +00:00
|
|
|
.\" http://austingroupbugs.net/view.php?id=74
|
2007-06-17 15:23:37 +00:00
|
|
|
|
2013-12-30 07:53:19 +00:00
|
|
|
error = dlerror();
|
2014-01-05 01:59:13 +00:00
|
|
|
if (error != NULL) {
|
time.1, atexit.3, bsearch.3, dlopen.3, envz_add.3, errno.3, fmtmsg.3, getgrent_r.3, getline.3, getmntent.3, getnameinfo.3, getpass.3, getpwent_r.3, gets.3, isalpha.3, printf.3, puts.3, recno.3, scandir.3, stdarg.3, sysconf.3, termios.3, wordexp.3, null.4, core.5, dir_colors.5, issue.5, proc.5, termcap.5, utmp.5, ascii.7, cpuset.7, glob.7, man-pages.7, man.7, mdoc.7, mdoc.samples.7, regex.7: Revert 9f8e673e623d (whose global s%\\e%\\\\% caused problems)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-09-26 21:56:54 +00:00
|
|
|
fprintf(stderr, "%s\en", error);
|
2007-05-14 21:11:42 +00:00
|
|
|
exit(EXIT_FAILURE);
|
2004-11-03 13:51:07 +00:00
|
|
|
}
|
|
|
|
|
time.1, atexit.3, bsearch.3, dlopen.3, envz_add.3, errno.3, fmtmsg.3, getgrent_r.3, getline.3, getmntent.3, getnameinfo.3, getpass.3, getpwent_r.3, gets.3, isalpha.3, printf.3, puts.3, recno.3, scandir.3, stdarg.3, sysconf.3, termios.3, wordexp.3, null.4, core.5, dir_colors.5, issue.5, proc.5, termcap.5, utmp.5, ascii.7, cpuset.7, glob.7, man-pages.7, man.7, mdoc.7, mdoc.samples.7, regex.7: Revert 9f8e673e623d (whose global s%\\e%\\\\% caused problems)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-09-26 21:56:54 +00:00
|
|
|
printf("%f\en", (*cosine)(2.0));
|
2004-11-03 13:51:07 +00:00
|
|
|
dlclose(handle);
|
2007-05-16 02:09:09 +00:00
|
|
|
exit(EXIT_SUCCESS);
|
2004-11-03 13:51:07 +00:00
|
|
|
}
|
|
|
|
.fi
|
|
|
|
.PP
|
|
|
|
If this program were in a file named "foo.c", you would build the program
|
|
|
|
with the following command:
|
2007-12-19 07:19:23 +00:00
|
|
|
.in +4n
|
2004-11-03 13:51:07 +00:00
|
|
|
.LP
|
2008-12-05 23:18:52 +00:00
|
|
|
gcc \-rdynamic \-o foo foo.c \-ldl
|
2007-12-19 07:19:23 +00:00
|
|
|
.in
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
2007-06-15 21:40:11 +00:00
|
|
|
Libraries exporting
|
|
|
|
.BR _init ()
|
2007-06-21 22:55:04 +00:00
|
|
|
and
|
2007-06-15 21:40:11 +00:00
|
|
|
.BR _fini ()
|
|
|
|
will want to be compiled as
|
time.1, _syscall.2, acct.2, getsockname.2, nanosleep.2, pciconfig_read.2, sched_get_priority_max.2, umask.2, uname.2, ustat.2, INFINITY.3, argz_add.3, atexit.3, bsearch.3, byteorder.3, carg.3, closedir.3, dlopen.3, drand48.3, envz_add.3, errno.3, ether_aton.3, exp10.3, finite.3, flockfile.3, fseeko.3, getcontext.3, getmntent.3, getnetent.3, getprotoent.3, getrpcent.3, getservent.3, iconv_close.3, iconv_open.3, initgroups.3, login.3, longjmp.3, mbsinit.3, memccpy.3, memmem.3, mempcpy.3, offsetof.3, on_exit.3, pow10.3, pthread_cancel.3, pthread_cleanup_push.3, rpc.3, rpmatch.3, setenv.3, setjmp.3, setlogmask.3, sockatmark.3, strfmon.3, strptime.3, strverscmp.3, swab.3, tcgetpgrp.3, tmpfile.3, toascii.3, y0.3, null.4, tty.4, tty_ioctl.4, hosts.equiv.5, environ.7, path_resolution.7, tzselect.8: Convert inline formatting (\fX...\fP) to dot-directive formatting
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-06-07 15:25:32 +00:00
|
|
|
follows, using
|
|
|
|
.I bar.c
|
|
|
|
as the example name:
|
2007-12-19 07:19:23 +00:00
|
|
|
.in +4n
|
2004-11-03 13:51:07 +00:00
|
|
|
.LP
|
2008-12-05 23:18:52 +00:00
|
|
|
gcc \-shared \-nostartfiles \-o bar bar.c
|
2007-12-19 07:19:23 +00:00
|
|
|
.in
|
getent.1, intro.1, time.1, _exit.2, _syscall.2, accept.2, access.2, acct.2, adjtimex.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bdflush.2, bind.2, brk.2, cacheflush.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, clone.2, close.2, connect.2, create_module.2, delete_module.2, dup.2, epoll_create.2, epoll_ctl.2, epoll_wait.2, eventfd.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, flock.2, fork.2, fstatat.2, fsync.2, futex.2, futimesat.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getitimer.2, getpagesize.2, getpeername.2, getpid.2, getpriority.2, getresuid.2, getrlimit.2, getrusage.2, getsid.2, getsockname.2, getsockopt.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, getxattr.2, idle.2, init_module.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, intro.2, io_cancel.2, io_destroy.2, io_getevents.2, io_setup.2, io_submit.2, ioctl.2, ioctl_list.2, ioperm.2, iopl.2, ioprio_set.2, ipc.2, kcmp.2, kill.2, killpg.2, link.2, linkat.2, listen.2, listxattr.2, llseek.2, lookup_dcookie.2, lseek.2, madvise.2, migrate_pages.2, mincore.2, mkdir.2, mkdirat.2, mknod.2, mknodat.2, mlock.2, mmap.2, mmap2.2, modify_ldt.2, mount.2, move_pages.2, mprotect.2, mq_getsetattr.2, mremap.2, msgctl.2, msgget.2, msgop.2, msync.2, nanosleep.2, nfsservctl.2, nice.2, open.2, openat.2, outb.2, pause.2, pciconfig_read.2, perf_event_open.2, perfmonctl.2, personality.2, pipe.2, pivot_root.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, ptrace.2, query_module.2, quotactl.2, read.2, readahead.2, readdir.2, readlink.2, readlinkat.2, readv.2, reboot.2, recv.2, remap_file_pages.2, removexattr.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, select.2, semctl.2, semget.2, semop.2, send.2, sendfile.2, set_thread_area.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setpgid.2, setresuid.2, setreuid.2, setsid.2, setuid.2, setup.2, setxattr.2, shmctl.2, shmget.2, shmop.2, shutdown.2, sigaction.2, sigaltstack.2, signal.2, signalfd.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, socket.2, socketcall.2, socketpair.2, splice.2, stat.2, statfs.2, stime.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, sysctl.2, sysfs.2, sysinfo.2, syslog.2, tee.2, time.2, timerfd_create.2, times.2, tkill.2, truncate.2, umask.2, umount.2, uname.2, unimplemented.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, MB_CUR_MAX.3, MB_LEN_MAX.3, __setfpucw.3, a64l.3, abort.3, abs.3, acos.3, acosh.3, addseverity.3, adjtime.3, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, alloca.3, argz_add.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, backtrace.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, btowc.3, btree.3, byteorder.3, bzero.3, cabs.3, cacos.3, cacosh.3, canonicalize_file_name.3, carg.3, casin.3, casinh.3, catan.3, catanh.3, catgets.3, catopen.3, cbrt.3, ccos.3, ccosh.3, ceil.3, cerf.3, cexp.3, cexp2.3, cfree.3, cimag.3, clearenv.3, clock.3, clock_getcpuclockid.3, clog.3, clog10.3, clog2.3, closedir.3, cmsg.3, confstr.3, conj.3, copysign.3, cos.3, cosh.3, cpow.3, cproj.3, creal.3, crypt.3, csin.3, csinh.3, csqrt.3, ctan.3, ctanh.3, ctermid.3, ctime.3, daemon.3, dbopen.3, des_crypt.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dlopen.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, encrypt.3, end.3, endian.3, envz_add.3, erf.3, erfc.3, err.3, errno.3, error.3, ether_aton.3, euidaccess.3, exec.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fclose.3, fcloseall.3, fdim.3, fenv.3, ferror.3, fexecve.3, fflush.3, ffs.3, fgetgrent.3, fgetpwent.3, fgetwc.3, fgetws.3, finite.3, flockfile.3, floor.3, fma.3, fmax.3, fmemopen.3, fmin.3, fmod.3, fmtmsg.3, fnmatch.3, fopen.3, fpathconf.3, fpclassify.3, fpurge.3, fputwc.3, fputws.3, fread.3, frexp.3, fseek.3, fseeko.3, ftime.3, ftok.3, fts.3, ftw.3, futimes.3, fwide.3, gamma.3, gcvt.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrent_r.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getipnodebyname.3, getline.3, getloadavg.3, getlogin.3, getmntent.3, getnameinfo.3, getnetent.3, getnetent_r.3, getopt.3, getpass.3, getprotoent.3, getprotoent_r.3, getpt.3, getpw.3, getpwent.3, getpwent_r.3, getpwnam.3, getrpcent.3, getrpcent_r.3, getrpcport.3, gets.3, getservent.3, getservent_r.3, getspnam.3, getttyent.3, getumask.3, getusershell.3, getutent.3, getw.3, getwchar.3, glob.3, grantpt.3, gsignal.3, hash.3, hsearch.3, hypot.3, iconv.3, iconv_close.3, iconv_open.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, isgreater.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, j0.3, key_setsecret.3, ldexp.3, lgamma.3, lio_listio.3, localeconv.3, lockf.3, log.3, log10.3, log1p.3, log2.3, logb.3, login.3, longjmp.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, malloc.3, malloc_hook.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mbtowc.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, mempcpy.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mpool.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, nan.3, netlink.3, nextafter.3, nl_langinfo.3, offsetof.3, on_exit.3, opendir.3, openpty.3, perror.3, popen.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, printf.3, profil.3, program_invocation_name.3, psignal.3, pthread_kill_other_threads_np.3, ptsname.3, putenv.3, putgrent.3, putpwent.3, puts.3, putwchar.3, qecvt.3, qsort.3, queue.3, raise.3, rand.3, random.3, random_r.3, rcmd.3, re_comp.3, readdir.3, realpath.3, recno.3, regex.3, remainder.3, remove.3, remquo.3, resolver.3, rewinddir.3, rexec.3, rint.3, round.3, rpc.3, rpmatch.3, rtime.3, rtnetlink.3, scalb.3, scalbln.3, scandir.3, scandirat.3, scanf.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, setlocale.3, setlogmask.3, setnetgrent.3, shm_open.3, siginterrupt.3, signbit.3, significand.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sin.3, sincos.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdarg.3, stdin.3, stdio.3, stdio_ext.3, stpcpy.3, stpncpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfmon.3, strfry.3, strftime.3, string.3, strlen.3, strnlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtod.3, strtoimax.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, termios.3, tgamma.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, towctrans.3, towlower.3, towupper.3, trunc.3, tsearch.3, ttyname.3, ttyslot.3, tzset.3, ualarm.3, ulimit.3, ungetwc.3, unlocked_stdio.3, unlockpt.3, updwtmp.3, usleep.3, wcpcpy.3, wcpncpy.3, wcrtomb.3, wcscasecmp.3, wcscat.3, wcschr.3, wcscmp.3, wcscpy.3, wcscspn.3, wcsdup.3, wcslen.3, wcsncasecmp.3, wcsncat.3, wcsncmp.3, wcsncpy.3, wcsnlen.3, wcsnrtombs.3, wcspbrk.3, wcsrchr.3, wcsrtombs.3, wcsspn.3, wcsstr.3, wcstoimax.3, wcstok.3, wcstombs.3, wcswidth.3, wctob.3, wctomb.3, wctrans.3, wctype.3, wcwidth.3, wmemchr.3, wmemcmp.3, wmemcpy.3, wmemmove.3, wmemset.3, wordexp.3, wprintf.3, xcrypt.3, xdr.3, y0.3, cciss.4, console.4, console_codes.4, console_ioctl.4, dsp56k.4, fd.4, full.4, hd.4, hpsa.4, initrd.4, intro.4, lp.4, mem.4, mouse.4, null.4, pts.4, ram.4, random.4, rtc.4, sk98lin.4, st.4, tty.4, ttyS.4, tty_ioctl.4, vcs.4, wavelan.4, acct.5, charmap.5, dir_colors.5, filesystems.5, ftpusers.5, group.5, host.conf.5, hosts.5, hosts.equiv.5, intro.5, issue.5, locale.5, motd.5, networks.5, nologin.5, nscd.conf.5, passwd.5, proc.5, protocols.5, resolv.conf.5, rpc.5, securetty.5, services.5, shells.5, termcap.5, ttytype.5, utmp.5, armscii-8.7, arp.7, ascii.7, bootparam.7, capabilities.7, charsets.7, complex.7, cp1251.7, credentials.7, ddp.7, environ.7, epoll.7, fifo.7, futex.7, glob.7, hier.7, icmp.7, inotify.7, intro.7, ip.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, locale.7, mailaddr.7, man.7, mq_overview.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, raw.7, regex.7, rtld-audit.7, rtnetlink.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, socket.7, standards.7, suffixes.7, svipc.7, tcp.7, termio.7, time.7, udp.7, udplite.7, unicode.7, unix.7, uri.7, utf-8.7, x25.7, nscd.8, sync.8, tzselect.8, zdump.8, zic.8: Global fix: remove unneeded double quotes in .SH headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:01:36 +00:00
|
|
|
.SH SEE ALSO
|
2004-11-03 13:51:07 +00:00
|
|
|
.BR ld (1),
|
|
|
|
.BR ldd (1),
|
|
|
|
.BR dl_iterate_phdr (3),
|
2009-01-12 19:47:47 +00:00
|
|
|
.BR rtld-audit (7),
|
2004-11-03 13:51:07 +00:00
|
|
|
.BR ld.so (8),
|
arch_prctl.2, fcntl.2, flock.2, get_robust_list.2, getpriority.2, ioprio_set.2, migrate_pages.2, mmap.2, mremap.2, msync.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, select.2, socket.2, subpage_prot.2, unshare.2, btree.3, dbopen.3, dl_iterate_phdr.3, dlopen.3, getnameinfo.3, hash.3, lockf.3, netlink.3, recno.3, rpc.3, xdr.3, cciss.4, console_ioctl.4, hpsa.4, initrd.4, msr.4, rtc.4, st.4, hosts.5, services.5, tzfile.5, aio.7, arp.7, capabilities.7, cpuset.7, feature_test_macros.7, futex.7, inotify.7, ip.7, ipv6.7, iso_8859-16.7, iso_8859-2.7, koi8-r.7, math_error.7, netlink.7, packet.7, pthreads.7, raw.7, spufs.7, udplite.7, uri.7, x25.7: Global fix: Various consistency fixes for SEE ALSO
Coauthored-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-09-24 07:53:22 +00:00
|
|
|
.BR ldconfig (8)
|
|
|
|
|
2004-11-03 13:51:07 +00:00
|
|
|
ld.so info pages, gcc info pages, ld info pages
|