LDP
/
man-pages
mirror of https://github.com/mkerrisk/man-pages
0
1
Fork 0
Code Releases Activity
A mirror of Man pages
21,346 Commits 1 Branch 197 Tags 93 MiB
Roff 99.5%
Shell 0.4%
Makefile 0.1%
Go to file
Yang Xu ab365f43e7 msgop.2: Add restriction on ENOSYS error 
When calling msgrcv() with the MSG_COPY flag, it will report
EINVAL error even we if have disabled CONFIG_CHECKPOINT_RESTORE.
ENOSYS will be reported only if we also specify the IPC_NOWAIT
flag.

[mtk: edited commit message]

Notes from mtk:

The relevant kernel code is this:

[[
#ifdef CONFIG_CHECKPOINT_RESTORE
...
#else
static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz)
{
        return ERR_PTR(-ENOSYS);
}

...
static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long
msgtyp, int msgflg,
               long (*msg_handler)(void __user *, struct msg_msg *, size_t))
{
...
        if (msgflg & MSG_COPY) {
                if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT))
                        return -EINVAL;
                copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));
...
}
]]

We'll only hit the ENOSYS error if:
(1) MSG_COPY was specified;
(2) IPC_NOWAIT was not specified; and
(3) CONFIG_CHECKPOINT_RESTORE was not enabled.

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
 		2020-09-09 14:19:44 +02:00
man1 sprof.1, eventfd.2, execve.2, futex.2, getdents.2, mprotect.2, open_by_handle_at.2, recvmmsg.2, sched_setaffinity.2, CPU_SET.3, backtrace.3, bsearch.3, dl_iterate_phdr.3, dlinfo.3, duplocale.3, encrypt.3, envz_add.3, fopencookie.3, getaddrinfo.3, getaddrinfo_a.3, getdate.3, getgrent_r.3, getgrouplist.3, getifaddrs.3, getprotoent_r.3, getservent_r.3, hsearch.3, mallinfo.3, malloc_info.3, mbstowcs.3, mtrace.3, pthread_create.3, pthread_getcpuclockid.3, pthread_setaffinity_np.3, qsort.3, rand.3, strcat.3, strtok.3, tsearch.3, wordexp.3, core.5, aio.7, inotify.7, sock_diag.7, unix.7, user_namespaces.7: Use C99 style to declare loop counter variables 2020-09-05 17:20:12 +02:00
man2 msgop.2: Add restriction on ENOSYS error 2020-09-09 14:19:44 +02:00
man3 posix_spawn.3: tfix 2020-09-08 07:29:33 +02:00
man4 loop.4: wfix 2020-09-09 11:08:41 +02:00
man5 proc.5: Note "open file description" as (better) synonym for "file handle" 2020-09-09 12:09:56 +02:00
man6 intro.6: wfix 2017-08-25 21:41:03 +02:00
man7 pthreads.7: Explicitly note that pthreads APIs return an errno-style value on error 2020-09-07 11:11:30 +02:00
man8 intro.1, clock_getres.2, execve.2, fcntl.2, iopl.2, lseek.2, mknod.2, mmap.2, mount.2, mq_getsetattr.2, pidfd_open.2, prctl.2, setns.2, sgetmask.2, sigaction.2, stat.2, statx.2, sync.2, syscalls.2, syslog.2, timerfd_create.2, umask.2, a64l.3, aio_init.3, atoi.3, dladdr.3, fread.3, getpt.3, isfdtype.3, malloc_stats.3, malloc_trim.3, mkfifo.3, mq_close.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, posix_memalign.3, posix_openpt.3, pthread_atfork.3, pthread_rwlockattr_setkind_np.3, regex.3, scanf.3, sem_close.3, sem_destroy.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sigset.3, sigvec.3, strftime.3, termios.3, console_codes.4, dsp56k.4, fd.4, lp.4, mouse.4, pts.4, sk98lin.4, dir_colors.5, proc.5, resolv.conf.5, termcap.5, utmp.5, aio.7, armscii-8.7, arp.7, capabilities.7, cgroups.7, charsets.7, cp1251.7, cp1252.7, environ.7, glob.7, inode.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, keyrings.7, koi8-r.7, koi8-u.7, mailaddr.7, man-pages.7, netdevice.7, operator.7, persistent-keyring.7, process-keyring.7, pthreads.7, pty.7, raw.7, regex.7, session-keyring.7, shm_overview.7, signal.7, socket.7, suffixes.7, thread-keyring.7, unicode.7, units.7, uri.7, user-keyring.7, user-session-keyring.7, iconvconfig.8, ld.so.8, zic.8: tstamp 2020-08-13 10:01:14 +02:00
scripts drop "coding: UTF-8" header 2020-08-13 09:36:46 +02:00
CONTRIBUTING CONTRIBUTING: New file with some starting tips on how to contribute 2019-09-13 15:59:08 +02:00
Changes Start of man-pages-5.09: updating Changes and Changes.old 2020-08-13 13:49:52 +02:00
Changes.old Changes.old: tfix 2020-09-04 09:41:46 +02:00
Makefile Makefile: Fix lintian.debian.org URL in comment 2020-08-25 13:55:07 +02:00
README README: Remove "Man page overlap and duplication" section 2020-04-13 09:06:45 +02:00
man-pages-5.09.Announce Start of man-pages-5.09: updating .Announce and .lsm files 2020-08-13 13:49:52 +02:00
man-pages-5.09.lsm Start of man-pages-5.09: updating .Announce and .lsm files 2020-08-13 13:49:52 +02:00

README 

This package contains Linux man pages for sections 1 through 8.  Some
more information is given in the 'man-pages-x.y.Announce' file.

Homepage
========
For information about the Linux man-pages project, see
http://www.kernel.org/doc/man-pages/index.html.

Bug reports and contributing
============================
If you have corrections and additions to suggest, see
http://www.kernel.org/doc/man-pages/contributing.html
(Although there is a mirror of this repository on GitHub,
please don't report issues via the GitHub issue tracker!)

For further information on contributing, see the CONTRIBUTING file.

Installing and uninstalling
===========================
"make install" will copy these man pages to /usr/share/man/man[1-8].

To install to a path different from /usr, use
"make install prefix=/install/path".

"make remove" or "make uninstall" will remove any man page in this
distribution from its destination.  Use with caution, and remember to
use "prefix" if desired, as with the "install" target.

"make" or "make all" will perform "make uninstall" followed by "make
install".

Copyrights
==========
See the 'man-pages-x.y.Announce' file.