260 lines
5.8 KiB
HTML
260 lines
5.8 KiB
HTML
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<HTML><HEAD><TITLE>Man page of SETNETGRENT</TITLE>
|
|
</HEAD><BODY>
|
|
<H1>SETNETGRENT</H1>
|
|
Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
|
|
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
|
|
|
|
<A NAME="lbAB"> </A>
|
|
<H2>NAME</H2>
|
|
|
|
setnetgrent, endnetgrent, getnetgrent, getnetgrent_r, innetgr -
|
|
handle network group entries
|
|
<A NAME="lbAC"> </A>
|
|
<H2>SYNOPSIS</H2>
|
|
|
|
<PRE>
|
|
<B>#include <<A HREF="file:///usr/include/netdb.h">netdb.h</A>></B>
|
|
|
|
<B>int setnetgrent(const char *</B><I>netgroup</I><B>);</B>
|
|
|
|
<B>void endnetgrent(void);</B>
|
|
|
|
<B>int getnetgrent(char **</B><I>host</I><B>, char **</B><I>user</I><B>, char **</B><I>domain</I><B>);</B>
|
|
|
|
<B>int getnetgrent_r(char **</B><I>host</I><B>, char **</B><I>user</I><B>,</B>
|
|
<B> char **</B><I>domain</I><B>, char *</B><I>buf</I><B>, size_t </B><I>buflen</I><B>);</B>
|
|
|
|
<B>int innetgr(const char *</B><I>netgroup</I><B>, const char *</B><I>host</I><B>,</B>
|
|
<B> const char *</B><I>user</I><B>, const char *</B><I>domain</I><B>);</B>
|
|
</PRE>
|
|
|
|
<P>
|
|
|
|
|
|
Feature Test Macro Requirements for glibc (see
|
|
<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
|
|
|
|
|
|
<P>
|
|
|
|
|
|
<B>setnetgrent</B>(),
|
|
|
|
<B>endnetgrent</B>(),
|
|
|
|
<B>getnetgrent</B>(),
|
|
|
|
<B>getnetgrent_r</B>(),
|
|
|
|
<B>innetgr</B>():
|
|
|
|
<BR> Since glibc 2.19:
|
|
<BR> _DEFAULT_SOURCE
|
|
<BR> Glibc 2.19 and earlier:
|
|
<BR> _BSD_SOURCE || _SVID_SOURCE
|
|
|
|
<A NAME="lbAD"> </A>
|
|
<H2>DESCRIPTION</H2>
|
|
|
|
The
|
|
<I>netgroup</I>
|
|
|
|
is a SunOS invention.
|
|
A netgroup database is a list of string triples
|
|
(<I>hostname</I>, <I>username</I>, <I>domainname</I>)
|
|
|
|
or other netgroup names.
|
|
Any of the elements in a triple can be empty,
|
|
which means that anything matches.
|
|
The functions described here allow access to the netgroup databases.
|
|
The file
|
|
<I>/etc/nsswitch.conf</I>
|
|
|
|
defines what database is searched.
|
|
<P>
|
|
|
|
The
|
|
<B>setnetgrent</B>()
|
|
|
|
call defines the netgroup that will be searched by subsequent
|
|
<B>getnetgrent</B>()
|
|
|
|
calls.
|
|
The
|
|
<B>getnetgrent</B>()
|
|
|
|
function retrieves the next netgroup entry, and returns pointers in
|
|
<I>host</I>,
|
|
|
|
<I>user</I>,
|
|
|
|
<I>domain</I>.
|
|
|
|
A null pointer means that the corresponding entry matches any string.
|
|
The pointers are valid only as long as there is no call to other
|
|
netgroup-related functions.
|
|
To avoid this problem you can use the GNU function
|
|
<B>getnetgrent_r</B>()
|
|
|
|
that stores the strings in the supplied buffer.
|
|
To free all allocated buffers use
|
|
<B>endnetgrent</B>().
|
|
|
|
<P>
|
|
|
|
In most cases you want to check only if the triplet
|
|
(<I>hostname</I>, <I>username</I>, <I>domainname</I>)
|
|
|
|
is a member of a netgroup.
|
|
The function
|
|
<B>innetgr</B>()
|
|
|
|
can be used for this without calling the above three functions.
|
|
Again, a null pointer is a wildcard and matches any string.
|
|
The function is thread-safe.
|
|
<A NAME="lbAE"> </A>
|
|
<H2>RETURN VALUE</H2>
|
|
|
|
These functions return 1 on success and 0 for failure.
|
|
<A NAME="lbAF"> </A>
|
|
<H2>FILES</H2>
|
|
|
|
<I>/etc/netgroup</I>
|
|
|
|
<BR>
|
|
|
|
<I>/etc/nsswitch.conf</I>
|
|
|
|
<A NAME="lbAG"> </A>
|
|
<H2>ATTRIBUTES</H2>
|
|
|
|
For an explanation of the terms used in this section, see
|
|
<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
|
|
|
|
<TABLE BORDER>
|
|
<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
|
|
<TR VALIGN=top><TD>
|
|
<B>setnetgrent</B>(),
|
|
|
|
<BR>
|
|
|
|
<B>getnetgrent_r</B>(),
|
|
|
|
<BR>
|
|
|
|
<B>innetgr</B>()
|
|
|
|
</TD><TD>Thread safety</TD><TD>
|
|
MT-Unsafe race:netgrent
|
|
<BR>
|
|
|
|
locale
|
|
<BR></TD></TR>
|
|
<TR VALIGN=top><TD>
|
|
<B>endnetgrent</B>()
|
|
|
|
</TD><TD>Thread safety</TD><TD>MT-Unsafe race:netgrent<BR></TD></TR>
|
|
<TR VALIGN=top><TD>
|
|
<B>getnetgrent</B>()
|
|
|
|
</TD><TD>Thread safety</TD><TD>
|
|
MT-Unsafe race:netgrent
|
|
<BR>
|
|
|
|
race:netgrentbuf locale
|
|
<BR></TD></TR>
|
|
</TABLE>
|
|
|
|
<P>
|
|
In the above table,
|
|
<I>netgrent</I>
|
|
|
|
in
|
|
<I>race:netgrent</I>
|
|
|
|
signifies that if any of the functions
|
|
<B>setnetgrent</B>(),
|
|
|
|
<B>getnetgrent_r</B>(),
|
|
|
|
<B>innetgr</B>(),
|
|
|
|
<B>getnetgrent</B>(),
|
|
|
|
or
|
|
<B>endnetgrent</B>()
|
|
|
|
are used in parallel in different threads of a program,
|
|
then data races could occur.
|
|
<A NAME="lbAH"> </A>
|
|
<H2>CONFORMING TO</H2>
|
|
|
|
These functions are not in POSIX.1, but
|
|
<B>setnetgrent</B>(),
|
|
|
|
<B>endnetgrent</B>(),
|
|
|
|
<B>getnetgrent</B>(),
|
|
|
|
and
|
|
<B>innetgr</B>()
|
|
|
|
are available on most UNIX systems.
|
|
<B>getnetgrent_r</B>()
|
|
|
|
is not widely available on other systems.
|
|
|
|
<A NAME="lbAI"> </A>
|
|
<H2>NOTES</H2>
|
|
|
|
In the BSD implementation,
|
|
<B>setnetgrent</B>()
|
|
|
|
returns void.
|
|
<A NAME="lbAJ"> </A>
|
|
<H2>SEE ALSO</H2>
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sethostent">sethostent</A></B>(3),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?3+setprotoent">setprotoent</A></B>(3),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?3+setservent">setservent</A></B>(3)
|
|
|
|
<A NAME="lbAK"> </A>
|
|
<H2>COLOPHON</H2>
|
|
|
|
This page is part of release 5.05 of the Linux
|
|
<I>man-pages</I>
|
|
|
|
project.
|
|
A description of the project,
|
|
information about reporting bugs,
|
|
and the latest version of this page,
|
|
can be found at
|
|
<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
|
|
<P>
|
|
|
|
<HR>
|
|
<A NAME="index"> </A><H2>Index</H2>
|
|
<DL>
|
|
<DT id="1"><A HREF="#lbAB">NAME</A><DD>
|
|
<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
|
|
<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
|
|
<DT id="4"><A HREF="#lbAE">RETURN VALUE</A><DD>
|
|
<DT id="5"><A HREF="#lbAF">FILES</A><DD>
|
|
<DT id="6"><A HREF="#lbAG">ATTRIBUTES</A><DD>
|
|
<DT id="7"><A HREF="#lbAH">CONFORMING TO</A><DD>
|
|
<DT id="8"><A HREF="#lbAI">NOTES</A><DD>
|
|
<DT id="9"><A HREF="#lbAJ">SEE ALSO</A><DD>
|
|
<DT id="10"><A HREF="#lbAK">COLOPHON</A><DD>
|
|
</DL>
|
|
<HR>
|
|
This document was created by
|
|
<A HREF="/cgi-bin/man/man2html">man2html</A>,
|
|
using the manual pages.<BR>
|
|
Time: 00:05:56 GMT, March 31, 2021
|
|
</BODY>
|
|
</HTML>
|