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”).