focal (2) sigsuspend.2freebsd.gz

Provided by: freebsd-manpages_12.0-1_all bug

NAME
     sigsuspend — atomically release blocked signals and wait for interrupt


LIBRARY
     Standard C Library (libc, -lc)


SYNOPSIS
     #include <signal.h>

     int
     sigsuspend(const sigset_t *sigmask);


DESCRIPTION
     The sigsuspend() system call temporarily changes the blocked signal mask to the set to which sigmask
     points, and then waits for a signal to arrive; on return the previous set of masked signals is restored.
     The signal mask set is usually empty to indicate that all signals are to be unblocked for the duration of
     the call.

     In normal usage, a signal is blocked using sigprocmask(2) to begin a critical section, variables modified
     on the occurrence of the signal are examined to determine that there is no work to be done, and the process
     pauses awaiting work by using sigsuspend() with the previous mask returned by sigprocmask(2).


RETURN VALUES
     The sigsuspend() system call always terminates by being interrupted, returning -1 with errno set to EINTR.


SEE ALSO
     pselect(2), sigaction(2), sigpending(2), sigprocmask(2), sigtimedwait(2), sigwait(2), sigwaitinfo(2),
     sigsetops(3)


STANDARDS
     The sigsuspend() system call is expected to conform to ISO/IEC 9945-1:1990 (“POSIX.1”).