SIGSETOPS

Section: C Library Functions (3)
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BSD mandoc

NAME

sigemptyset sigfillset sigaddset sigdelset sigismember - manipulate signal sets

SYNOPSIS

Fd #include <signal.h> Ft int Fn sigemptyset sigset_t *set Ft int Fn sigfillset sigset_t *set Ft int Fn sigaddset sigset_t *set int signo Ft int Fn sigdelset sigset_t *set int signo Ft int Fn sigismember sigset_t *set int signo

DESCRIPTION

These functions manipulate signal sets stored in a Fa sigset_t . Either Fn sigemptyset or Fn sigfillset must be called for every object of type Fa sigset_t before any other use of the object. Fn sigemptyset and Fn sigfillset are provided as macros, but actual functions are available if their names are undefined (with #undef name )

The Fn sigemptyset function initializes a signal set to be empty.

The Fn sigfillset function initializes a signal set to contain all signals.

The Fn sigaddset function adds the specified signal Fa signo to the signal set.

The Fn sigdelset function deletes the specified signal Fa signo from the signal set.

The Fn sigismember function returns whether a specified signal Fa signo is contained in the signal set.

These functions are provided as macros in the include file <signal.h>. Actual functions are available if their names are undefined (with #undef name )

RETURN VALUES

The Fn sigismember function returns 1 if the signal is a member of the set, a 0 otherwise. The other functions return 0 upon success. A -1 return value indicates an error occurred and the global variable errno is set to indicated the reason.

ERRORS

These functions could fail if one of the following occurs:

Bq Er EINVAL: Fa signo has an invalid value.

STANDARDS

These functions are defined by St -p1003.1-90 .

This document was created by man2html, using the manual pages.
Time: 15:52:52 GMT, January 15, 2023