#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

       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 sig-
       nals in mask, has no effect on the process's signal mask.

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

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

       EINTR  The call was interrupted by a signal.


       Normally,  sigsuspend()  is  used in conjunction with sigprocmask(2) 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(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.

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

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