#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, with errno set to inndicate  the  error
       (normally, 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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