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5e3114974a
2001-03-25 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/getgroups.c (__getgroups): getgroups32 syscall checks for negative n so don't test here as well.
85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/* Copyright (C) 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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#include <linux/posix_types.h>
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#include <kernel-features.h>
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extern int __syscall_getgroups (int, __kernel_gid_t *__unbounded);
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#ifdef __NR_getgroups32
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extern int __syscall_getgroups32 (int, __kernel_gid32_t *__unbounded);
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# if __ASSUME_32BITUIDS == 0
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/* This variable is shared with all files that need to check for 32bit
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uids. */
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extern int __libc_missing_32bit_uids;
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# endif
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#endif /* __NR_getgroups32 */
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/* For Linux we must convert the array of groups from the format that the
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kernel returns. */
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int
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__getgroups (int n, gid_t *groups)
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{
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#if __ASSUME_32BITUIDS > 0
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return INLINE_SYSCALL (getgroups32, 2, n, CHECK_N (groups, n));
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#else
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if (__builtin_expect (n, 1) < 0)
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{
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__set_errno (EINVAL);
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return -1;
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}
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else
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{
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int i, ngids;
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__kernel_gid_t kernel_groups[n = MIN (n, __sysconf (_SC_NGROUPS_MAX))];
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# ifdef __NR_getgroups32
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if (__libc_missing_32bit_uids <= 0)
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{
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int result;
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int saved_errno = errno;
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result = INLINE_SYSCALL (getgroups32, 2, n, CHECK_N (groups, n));
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if (result == 0 || errno != ENOSYS)
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return result;
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__set_errno (saved_errno);
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__libc_missing_32bit_uids = 1;
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}
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# endif /* __NR_getgroups32 */
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ngids = INLINE_SYSCALL (getgroups, 2, n, CHECK_N (kernel_groups, n));
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if (n != 0 && ngids > 0)
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for (i = 0; i < ngids; i++)
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(__ptrvalue (groups))[i] = kernel_groups[i];
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return ngids;
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}
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#endif
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}
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weak_alias (__getgroups, getgroups)
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