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SIGSUSPEND (2) | System calls | Unix Manual Pages | :man

NAME

sigsuspend - atomically release blocked signals and wait for interrupt

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In 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

sigaction(2), sigpending(2), sigprocmask(2), sigsetops(3)

STANDARDS


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