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glibc  2.9
Functions | Variables
sigprocmask.c File Reference
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include <kernel-features.h>
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Functions

int __sigprocmask (int how, const sigset_t *set, sigset_t *oset)

Variables

int __libc_missing_rt_sigs

Function Documentation

int __sigprocmask ( int  how,
const sigset_t set,
sigset_t oset 
)

Definition at line 38 of file sigprocmask.c.

{
#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
}

Variable Documentation

Definition at line 35 of file sigaction.c.