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NAME

     sigwait - select a set of signals

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <signal.h>

     int
     sigwait(const sigset_t * restrict set, int * restrict sig);

DESCRIPTION

     The sigwait() system call selects a set of signals, specified by set.  If
     none of the selected signals are pending, sigwait() waits until one or
     more of the selected signals has been generated.  Then sigwait()
     atomically clears one of the selected signals from the set of pending
     signals for the process and sets the location pointed to by sig to the
     signal number that was cleared.

     The signals specified by set should be blocked at the time of the call to
     sigwait().

RETURN VALUES

     If successful, sigwait() returns 0 and sets the location pointed to by
     sig to the cleared signal number.  Otherwise, an error number is
     returned.

ERRORS

     The sigwait() system call will fail if:

     [EINVAL]           The set argument specifies one or more invalid signal
                        numbers.

SEE ALSO

     sigaction(2), sigpending(2), sigsuspend(2), pause(3), pthread_sigmask(3)

STANDARDS

     The sigwait() function conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).