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SIGSUSPEND(2FREEBSD) - man page online | system calls

Atomically release blocked signals and wait for interrupt.

Chapter
August 16, 2013
SIGSUSPEND(2)                        BSD System Calls Manual                        SIGSUSPEND(2)

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, vari‐ ables 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 previ‐ ous 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”).
BSD August 16, 2013 BSD
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sigsuspend(2freebsd) referred by
refer to select(2) | sigaction(2) | sigpending(2) | sigprocmask(2) | sigsetops(3) | sigsuspend(2) | sigwait(2freebsd) | sigwaitinfo(2)