mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* Copyright (C) 1989, 1991, 1993 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library 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 C Library 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <grp.h>
|
|
#include <limits.h>
|
|
#include <sys/types.h>
|
|
|
|
|
|
/* Initialize the group set for the current user
|
|
by reading the group database and using all groups
|
|
of which USER is a member. Also include GROUP. */
|
|
int
|
|
DEFUN(initgroups, (user, group),
|
|
CONST char *user AND gid_t group)
|
|
{
|
|
#ifdef NGROUPS_MAX
|
|
#if NGROUPS_MAX == 0
|
|
return 0;
|
|
#else
|
|
static PTR info = NULL;
|
|
register FILE *stream;
|
|
register struct group *g;
|
|
gid_t groups[NGROUPS_MAX];
|
|
register size_t n;
|
|
|
|
if (info == NULL)
|
|
{
|
|
info = __grpalloc();
|
|
if (info == NULL)
|
|
return -1;
|
|
}
|
|
|
|
stream = __grpopen();
|
|
if (stream == NULL)
|
|
return -1;
|
|
|
|
n = 0;
|
|
groups[n++] = group;
|
|
|
|
while (n < NGROUPS_MAX && (g = __grpread(stream, info)) != NULL)
|
|
if (g->gr_gid != group)
|
|
{
|
|
register char **m;
|
|
|
|
for (m = g->gr_mem; *m != NULL; ++m)
|
|
if (!strcmp(*m, user))
|
|
groups[n++] = g->gr_gid;
|
|
}
|
|
|
|
return setgroups(n, groups);
|
|
#endif
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|