| /* Copyright (C) 1996,1997,1998,1999,2000,2002,2003,2006 |
| 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 <signal.h> |
| #include <unistd.h> |
| |
| #include <sysdep-cancel.h> |
| #include <sys/syscall.h> |
| #include <bp-checks.h> |
| |
| #include <kernel-features.h> |
| |
| |
| #if !__ASSUME_REALTIME_SIGNALS |
| /* The variable is shared between all wrappers around signal handling |
| functions which have RT equivalents. The definition is in sigaction.c. */ |
| extern int __libc_missing_rt_sigs; |
| |
| |
| static int |
| do_sigsuspend (const sigset_t *set) |
| { |
| # ifdef __NR_rt_sigsuspend |
| /* First try the RT signals. */ |
| if (!__libc_missing_rt_sigs) |
| { |
| /* XXX The size argument hopefully will have to be changed to the |
| real size of the user-level sigset_t. */ |
| int saved_errno = errno; |
| int result = INLINE_SYSCALL (rt_sigsuspend, 2, |
| CHECK_SIGSET (set), _NSIG / 8); |
| if (result >= 0 || errno != ENOSYS) |
| return result; |
| |
| __set_errno (saved_errno); |
| __libc_missing_rt_sigs = 1; |
| } |
| # endif |
| |
| return INLINE_SYSCALL (sigsuspend, 3, 0, 0, set->__val[0]); |
| } |
| #else |
| static inline int __attribute__ ((always_inline)) |
| do_sigsuspend (const sigset_t *set) |
| { |
| return INLINE_SYSCALL (rt_sigsuspend, 2, CHECK_SIGSET (set), _NSIG / 8); |
| } |
| #endif |
| |
| /* Change the set of blocked signals to SET, |
| wait until a signal arrives, and restore the set of blocked signals. */ |
| int |
| __sigsuspend (set) |
| const sigset_t *set; |
| { |
| if (SINGLE_THREAD_P) |
| return do_sigsuspend (set); |
| |
| int oldtype = LIBC_CANCEL_ASYNC (); |
| |
| int result = do_sigsuspend (set); |
| |
| LIBC_CANCEL_RESET (oldtype); |
| |
| return result; |
| } |
| libc_hidden_def (__sigsuspend) |
| weak_alias (__sigsuspend, sigsuspend) |
| strong_alias (__sigsuspend, __libc_sigsuspend) |
| |
| #ifndef NO_CANCELLATION |
| int |
| __sigsuspend_nocancel (set) |
| const sigset_t *set; |
| { |
| return do_sigsuspend (set); |
| } |
| #endif |