1 /* Copyright (C) 1996,1997,1998,1999,2000,2002,2003,2006
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include <sysdep-cancel.h>
25 #include <sys/syscall.h>
26 #include <bp-checks.h>
28 #include <kernel-features.h>
31 #if !__ASSUME_REALTIME_SIGNALS
32 /* The variable is shared between all wrappers around signal handling
33 functions which have RT equivalents. The definition is in sigaction.c. */
34 extern int __libc_missing_rt_sigs;
38 do_sigsuspend (const sigset_t *set)
40 # ifdef __NR_rt_sigsuspend
41 /* First try the RT signals. */
42 if (!__libc_missing_rt_sigs)
44 /* XXX The size argument hopefully will have to be changed to the
45 real size of the user-level sigset_t. */
46 int saved_errno = errno;
47 int result = INLINE_SYSCALL (rt_sigsuspend, 2,
48 CHECK_SIGSET (set), _NSIG / 8);
49 if (result >= 0 || errno != ENOSYS)
52 __set_errno (saved_errno);
53 __libc_missing_rt_sigs = 1;
57 return INLINE_SYSCALL (sigsuspend, 3, 0, 0, set->__val[0]);
60 static inline int __attribute__ ((always_inline))
61 do_sigsuspend (const sigset_t *set)
63 return INLINE_SYSCALL (rt_sigsuspend, 2, CHECK_SIGSET (set), _NSIG / 8);
67 /* Change the set of blocked signals to SET,
68 wait until a signal arrives, and restore the set of blocked signals. */
74 return do_sigsuspend (set);
76 int oldtype = LIBC_CANCEL_ASYNC ();
78 int result = do_sigsuspend (set);
80 LIBC_CANCEL_RESET (oldtype);
84 libc_hidden_def (__sigsuspend)
85 weak_alias (__sigsuspend, sigsuspend)
86 strong_alias (__sigsuspend, __libc_sigsuspend)
88 #ifndef NO_CANCELLATION
90 __sigsuspend_nocancel (set)
93 return do_sigsuspend (set);