glibc/posix/group_member.c
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

50 lines
1.3 KiB
C

/* `group_member' -- test if process is in a given group.
Copyright (C) 1995-2021 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#ifndef NGROUPS_MAX
#define NGROUPS_MAX 16 /* First guess. */
#endif
int
__group_member (gid_t gid)
{
int n, size;
gid_t *groups;
size = NGROUPS_MAX;
do
{
groups = __alloca (size * sizeof *groups);
n = __getgroups (size, groups);
size *= 2;
}
while (n == size / 2);
while (n-- > 0)
if (groups[n] == gid)
return 1;
return 0;
}
weak_alias (__group_member, group_member)