sigsuspend(2)



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

NAME
       sigsuspend - wait for a signal

SYNOPSIS
       #include <signal.h>

       int sigsuspend(const sigset_t *mask);

DESCRIPTION
       sigsuspend()  temporarily  replaces the signal mask of the calling pro-
       cess 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 sig-
       nals 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.

NOTES
       Normally,  sigsuspend()  is  used  in conjunction with sigprocmask() in
       order to prevent delivery of a signal during the execution of a  criti-
       cal  code  section.   The caller first blocks the signals with sigproc-
       mask().  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() (in the oldset argument).

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

CONFORMING TO
       POSIX.1-2001.

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

Linux 2.6.13                      2005-09-15                     SIGSUSPEND(2)

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