SIGSETOPS

Section: Misc. Reference Manual Pages (3P)
Updated: August 1, 1992
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NAME

sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - (POSIX only) manipulate signal sets.

SYNOPSIS

#include <signal.h>

int sigemptyset(sigset_t *set);

int sigfillset(sigset_t *set);

int sigaddset(sigset_t *set, int signo);

int sigdelset(sigset_t *set, int signo);

int sigismember(const sigset_t *set, int signo);

DESCRIPTION

The information in this specification applies only to POSIX applications.

The sigsetops primitives manipulate sets of signals. They operate on data objects addressable by the application, not on any set of signals known to the system, such as the set blocked from delivery to a process or the set pending for a process.

The sigemptyset function initializes the signal set pointed to by the argument set, such that all signals are excluded.

The sigfillset function initializes the signal set pointed to by the argument set, such that all signals are included.

The sigaddset and sigdelset functions respectively add or delete the individual signal specified by the value of the argument signo to or from the signal set pointed to by the argument set.

The sigismember function tests whether the signal specified by the value of the argument signo is a member of the set pointed to by the argument set.

RETURNS

Upon successful completion, the sigismember function returns a value of one if the specified signal is a member of the specified set, or a value of zero if it is not. Upon successful completion, the other functions return a value of zero. For all of the above functions, if an error is detected, a value of -1 is returned, and errno is set to indicate the error.

ERRORS

[EINVAL]: The value of the signo argument is an invalid or unsupported signal number.

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