| /* Copyright (C) 1997, 1998, 2000, 2001, 2003 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <sys/param.h> |
| #include <sys/types.h> |
| |
| #include <sysdep.h> |
| #include <sys/syscall.h> |
| #include <bp-checks.h> |
| |
| #include <linux/posix_types.h> |
| #include <kernel-features.h> |
| |
| |
| #ifdef __NR_getgroups32 |
| # if __ASSUME_32BITUIDS == 0 |
| /* This variable is shared with all files that need to check for 32bit |
| uids. */ |
| extern int __libc_missing_32bit_uids attribute_hidden; |
| # endif |
| #endif /* __NR_getgroups32 */ |
| |
| /* For Linux we must convert the array of groups from the format that the |
| kernel returns. */ |
| int |
| __getgroups (int n, gid_t *groups) |
| { |
| #if __ASSUME_32BITUIDS > 0 |
| return INLINE_SYSCALL (getgroups32, 2, n, CHECK_N (groups, n)); |
| #else |
| if (__builtin_expect (n, 1) < 0) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| else |
| { |
| # ifdef __NR_getgroups32 |
| if (__libc_missing_32bit_uids <= 0) |
| { |
| int result; |
| int saved_errno = errno; |
| |
| result = INLINE_SYSCALL (getgroups32, 2, n, CHECK_N (groups, n)); |
| if (result != -1 || errno != ENOSYS) |
| return result; |
| |
| __set_errno (saved_errno); |
| __libc_missing_32bit_uids = 1; |
| } |
| # endif /* __NR_getgroups32 */ |
| |
| int i, ngids; |
| __kernel_gid_t kernel_groups[n = MIN (n, __sysconf (_SC_NGROUPS_MAX))]; |
| |
| ngids = INLINE_SYSCALL (getgroups, 2, n, CHECK_N (kernel_groups, n)); |
| if (n != 0 && ngids > 0) |
| for (i = 0; i < ngids; i++) |
| (__ptrvalue (groups))[i] = kernel_groups[i]; |
| return ngids; |
| } |
| #endif |
| } |
| |
| weak_alias (__getgroups, getgroups) |