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  sigsuspend()
       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 process'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  during  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 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2008-08-29                                              SIGSUSPEND(2)