82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/* Copyright (C) 1998, 2000, 2002, 2003, 2004 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include "kernel-features.h"
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#include <pthread-functions.h>
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#if defined __NR_setresgid || __ASSUME_SETRESGID_SYSCALL > 0
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extern int __setresgid (gid_t rgid, gid_t egid, gid_t sgid);
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int
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setegid (gid_t gid)
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{
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int result;
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if (gid == (gid_t) ~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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# if __ASSUME_32BITUIDS > 0 && defined __NR_setresgid32
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result = INLINE_SYSCALL (setresgid32, 3, -1, gid, -1);
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# else
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/* First try the syscall. */
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result = INLINE_SYSCALL (setresgid, 3, -1, gid, -1);
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# if __ASSUME_SETRESGID_SYSCALL == 0
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if (result == -1 && errno == ENOSYS)
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/* No system call available. Use emulation. This may not work
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since `setregid' also sets the saved group ID when GID is not
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equal to the real group ID, making it impossible to switch back. */
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result = __setregid (-1, gid);
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# endif
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# endif
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#if defined HAVE_PTR__NPTL_SETXID && !defined SINGLE_THREAD
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if (result == 0 && __libc_pthread_functions.ptr__nptl_setxid != NULL)
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{
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struct xid_command cmd;
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# ifdef __NR_setresgid32
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cmd.syscall_no = __NR_setresgid32;
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# else
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cmd.syscall_no = __NR_setresgid;
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# endif
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cmd.id[0] = -1;
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cmd.id[1] = gid;
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cmd.id[2] = -1;
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__libc_pthread_functions.ptr__nptl_setxid (&cmd);
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}
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#endif
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return result;
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}
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#ifndef setegid
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libc_hidden_def (setegid)
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#endif
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#else
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# include <sysdeps/unix/bsd/setegid.c>
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#endif
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