sigismember3p
Test for a signal in a signal set
Usage
#include <signal.h>
int sigismember(const sigset_t *set, int signo);
Prolog
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
Overview
The sigismember() function shall test whether the signal specified by signo is a member of the set pointed to by set.
Applications should call either sigemptyset() or sigfillset() at least once for each object of type sigset_t prior to any other use of that object. If such an object is not initialized in this way, but is nonetheless supplied as an argument to any of pthread_sigmask(), sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigprocmask(), sigsuspend(), sigtimedwait(), sigwait(), or sigwaitinfo(), the results are undefined.
Return value
Upon successful completion, sigismember() shall return 1 if the specified signal is a member of the specified set, or 0 if it is not. Otherwise, it shall return -1 and set errno to indicate the error.
Errors
The sigismember() function may fail if:
- EINVAL
-
The signo argument is not a valid signal number, or is an unsupported signal number.
The following sections are informative.
Examples
None.
Application usage
None.
Rationale
None.
Future directions
None.