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-'\" t
-.\"  Copyright 2002 walter harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\"  based on glibc infopages
-.\" polished - aeb
-.\"
-.TH setnetgrent 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-setnetgrent, endnetgrent, getnetgrent, getnetgrent_r, innetgr \-
-handle network group entries
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <netdb.h>
-.PP
-.BI "int setnetgrent(const char *" netgroup );
-.B "void endnetgrent(void);"
-.PP
-.BI "int getnetgrent(char **restrict " host ,
-.BI "            char **restrict " user ", char **restrict " domain );
-.BI "int getnetgrent_r(char **restrict " host ,
-.BI "            char **restrict " user ", char **restrict " domain ,
-.BI "            char " buf "[restrict ." buflen "], size_t " buflen );
-.PP
-.BI "int innetgr(const char *" netgroup ", const char *" host ,
-.BI "            const char *" user ", const char *" domain );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.ad l
-.PP
-.nh
-.BR setnetgrent (),
-.BR endnetgrent (),
-.BR getnetgrent (),
-.BR getnetgrent_r (),
-.BR innetgr ():
-.hy
-.nf
-    Since glibc 2.19:
-        _DEFAULT_SOURCE
-    glibc 2.19 and earlier:
-        _BSD_SOURCE || _SVID_SOURCE
-.fi
-.ad
-.SH DESCRIPTION
-The
-.I netgroup
-is a SunOS invention.
-A netgroup database is a list of string triples
-.RI ( hostname ", " username ", " domainname )
-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
-defines what database is searched.
-.PP
-The
-.BR setnetgrent ()
-call defines the netgroup that will be searched by subsequent
-.BR getnetgrent ()
-calls.
-The
-.BR getnetgrent ()
-function retrieves the next netgroup entry, and returns pointers in
-.IR host ,
-.IR user ,
-.IR domain .
-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
-.BR getnetgrent_r ()
-that stores the strings in the supplied buffer.
-To free all allocated buffers use
-.BR endnetgrent ().
-.PP
-In most cases you want to check only if the triplet
-.RI ( hostname ", " username ", " domainname )
-is a member of a netgroup.
-The function
-.BR innetgr ()
-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.
-.SH RETURN VALUE
-These functions return 1 on success and 0 for failure.
-.SH FILES
-.I /etc/netgroup
-.br
-.I /etc/nsswitch.conf
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lb lb lbx
-l l l.
-Interface	Attribute	Value
-T{
-.BR setnetgrent (),
-.BR getnetgrent_r (),
-.BR innetgr ()
-T}	Thread safety	T{
-MT-Unsafe race:netgrent
-locale
-T}
-T{
-.BR endnetgrent ()
-T}	Thread safety	T{
-MT-Unsafe race:netgrent
-T}
-T{
-.BR getnetgrent ()
-T}	Thread safety	T{
-MT-Unsafe race:netgrent
-race:netgrentbuf locale
-T}
-.TE
-.hy
-.ad
-.sp 1
-In the above table,
-.I netgrent
-in
-.I race:netgrent
-signifies that if any of the functions
-.BR setnetgrent (),
-.BR getnetgrent_r (),
-.BR innetgr (),
-.BR getnetgrent (),
-or
-.BR endnetgrent ()
-are used in parallel in different threads of a program,
-then data races could occur.
-.SH VERSIONS
-In the BSD implementation,
-.BR setnetgrent ()
-returns void.
-.SH STANDARDS
-None.
-.SH HISTORY
-.BR setnetgrent (),
-.BR endnetgrent (),
-.BR getnetgrent (),
-and
-.BR innetgr ()
-are available on most UNIX systems.
-.BR getnetgrent_r ()
-is not widely available on other systems.
-.\" getnetgrent_r() is on Solaris 8 and AIX 5.1, but not the BSDs.
-.SH SEE ALSO
-.BR sethostent (3),
-.BR setprotoent (3),
-.BR setservent (3)