/* Copyright (C) 1997-2001,2003,2004,2006 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 <string.h> /* Neede for string function builtin redirection. */ #include <unistd.h> #include <sysdep.h> #include <sys/syscall.h> #include <bp-checks.h> #include <kernel-features.h> /* 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; /* Get and/or change the set of blocked signals. */ int __sigprocmask (how, set, oset) int how; const sigset_t *set; sigset_t *oset; { #ifdef SIGCANCEL sigset_t local_newmask; /* The only thing we have to make sure here is that SIGCANCEL and SIGSETXID are not blocked. */ if (set != NULL && (__builtin_expect (__sigismember (set, SIGCANCEL), 0) # ifdef SIGSETXID || __builtin_expect (__sigismember (set, SIGSETXID), 0) # endif )) { local_newmask = *set; __sigdelset (&local_newmask, SIGCANCEL); # ifdef SIGSETXID __sigdelset (&local_newmask, SIGSETXID); # endif set = &local_newmask; } #endif #if __ASSUME_REALTIME_SIGNALS > 0 return INLINE_SYSCALL (rt_sigprocmask, 4, how, CHECK_SIGSET_NULL_OK (set), CHECK_SIGSET_NULL_OK (oset), _NSIG / 8); #else # ifdef __NR_rt_sigprocmask /* 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_sigprocmask, 4, how, CHECK_SIGSET_NULL_OK (set), CHECK_SIGSET_NULL_OK (oset), _NSIG / 8); if (result >= 0 || errno != ENOSYS) return result; __set_errno (saved_errno); __libc_missing_rt_sigs = 1; } # endif return INLINE_SYSCALL (sigprocmask, 3, how, CHECK_SIGSET_NULL_OK (set), CHECK_SIGSET_NULL_OK (oset)); #endif } weak_alias (__sigprocmask, sigprocmask)