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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 19:19:11 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Wed Oct 18 20:23:54 1995 by Martin Schulze <joey@infodrom.north.de>
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.\" Modified Mon Apr 22 01:50:54 1996 by Martin Schulze <joey@infodrom.north.de>
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.\" 2001-07-25 added a clause about NULL proto (Martin Michlmayr or David N. Welton)
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.\"
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2008-08-18 13:40:35 +00:00
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.TH GETSERVENT 3 2008-08-19 "GNU" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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getservent, getservbyname, getservbyport, setservent, endservent \-
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get service entry
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.SH SYNOPSIS
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.nf
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.B #include <netdb.h>
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.sp
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.B struct servent *getservent(void);
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.sp
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.BI "struct servent *getservbyname(const char *" name ", const char *" proto );
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.sp
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.BI "struct servent *getservbyport(int " port ", const char *" proto );
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.sp
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.BI "void setservent(int " stayopen );
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.sp
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.B void endservent(void);
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.fi
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.SH DESCRIPTION
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2007-05-12 09:06:04 +00:00
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The
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.BR getservent ()
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function reads the next entry from the services database (see
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.BR services (5))
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and returns a \fIservent\fP structure containing
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the broken-out fields from the entry.
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A connection is opened to the database if necessary.
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.PP
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The
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.BR getservbyname ()
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function returns a \fIservent\fP structure
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for the entry from the database
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that matches the service \fIname\fP using protocol \fIproto\fP.
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If \fIproto\fP is NULL, any protocol will be matched.
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A connection is opened to the database if necessary.
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.PP
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The
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.BR getservbyport ()
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function returns a \fIservent\fP structure
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for the entry from the database
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that matches the port \fIport\fP (given in network byte order)
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using protocol \fIproto\fP.
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If \fIproto\fP is NULL, any protocol will be matched.
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A connection is opened to the database if necessary.
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.PP
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2007-05-12 09:06:04 +00:00
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The
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.BR setservent ()
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function opens a connection to the database,
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and sets the next entry to the first entry.
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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
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If \fIstayopen\fP is nonzero,
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then the connection to the database
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will not be closed between calls to one of the
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.BR getserv* ()
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functions.
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2004-11-03 13:51:07 +00:00
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.PP
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2007-05-12 09:06:04 +00:00
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The
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.BR endservent ()
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function closes the connection to the database.
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.PP
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The \fIservent\fP structure is defined in \fI<netdb.h>\fP as follows:
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.sp
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.in +4n
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.nf
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struct servent {
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char *s_name; /* official service name */
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char **s_aliases; /* alias list */
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int s_port; /* port number */
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char *s_proto; /* protocol to use */
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}
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.fi
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2007-12-19 06:16:04 +00:00
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.in
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.PP
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The members of the \fIservent\fP structure are:
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.TP
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.I s_name
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The official name of the service.
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.TP
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.I s_aliases
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A NULL-terminated list of alternative names for the service.
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.TP
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.I s_port
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The port number for the service given in network byte order.
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.TP
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.I s_proto
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The name of the protocol to use with this service.
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.SH "RETURN VALUE"
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2007-05-12 09:06:04 +00:00
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The
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.BR getservent (),
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.BR getservbyname ()
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and
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.BR getservbyport ()
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2008-08-18 13:39:34 +00:00
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functions return a pointer to a
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statically allocated \fIservent\fP structure, or a NULL pointer if an
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error occurs or the end of the file is reached.
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.SH FILES
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.TP
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.I /etc/services
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services database file
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.SH "CONFORMING TO"
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4.3BSD, POSIX.1-2001.
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.SH "SEE ALSO"
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.BR getnetent (3),
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.BR getprotoent (3),
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.BR getservent_r (3),
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.BR services (5)
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