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SIGSUSPEND(2)              Linux Programmer's Manual             SIGSUSPEND(2)



NAME
       sigsuspend - wait for a signal

SYNOPSIS
       #include <signal.h>

       int sigsuspend(const sigset_t *mask);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigsuspend(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

DESCRIPTION
       sigsuspend()  temporarily  replaces the signal mask of the calling process with the mask given by mask and then
       suspends the process until delivery of a signal whose action is to invoke a signal handler or  to  terminate  a
       process.

       If the signal terminates the process, then sigsuspend() does not return.  If the signal is caught, then sigsus-
       pend() returns after the signal handler returns, and the signal mask is restored to the state before  the  call
       to sigsuspend().

       It  is  not  possible  to block SIGKILL or SIGSTOP; specifying these signals in mask, has no effect on the pro-
       cess's signal mask.

RETURN VALUE
       sigsuspend() always returns -1, normally with the error EINTR.

ERRORS
       EFAULT mask points to memory which is not a valid part of the process address space.

       EINTR  The call was interrupted by a signal.

CONFORMING TO
       POSIX.1-2001.

NOTES
       Normally, sigsuspend() is used in conjunction with sigprocmask(2) in order to prevent delivery of a signal dur-
       ing  the  execution of a critical code section.  The caller first blocks the signals with sigprocmask(2).  When
       the critical code has completed, the caller then waits for the signals by calling sigsuspend() with the  signal
       mask that was returned by sigprocmask(2) (in the oldset argument).

       See sigsetops(3) for details on manipulating signal sets.

SEE ALSO
       kill(2), pause(2), sigaction(2), signal(2), sigprocmask(2), sigwaitinfo(2), sigsetops(3), sigwait(3), signal(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-08-29                     SIGSUSPEND(2)