| .\" Copyright (c) 1994 Mike Battersby |
| .\" |
| .\" Permission is granted to make and distribute verbatim copies of this |
| .\" manual provided the copyright notice and this permission notice are |
| .\" preserved on all copies. |
| .\" |
| .\" Permission is granted to copy and distribute modified versions of this |
| .\" manual under the conditions for verbatim copying, provided that the |
| .\" entire resulting derived work is distributed under the terms of a |
| .\" permission notice identical to this one. |
| .\" |
| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
| .\" responsibility for errors or omissions, or for damages resulting from |
| .\" the use of the information contained herein. The author(s) may not |
| .\" have taken the same level of care in the production of this manual, |
| .\" which is licensed free of charge, as they might when working |
| .\" professionally. |
| .\" |
| .\" Formatted or processed versions of this manual, if unaccompanied by |
| .\" the source, must acknowledge the copyright and authors of this work. |
| .\" |
| .\" Modified by aeb, 960721 |
| .\" 2005-11-21, mtk, added descriptions of sigisemptyset(), sigandset(), |
| .\" and sigorset() |
| .\" |
| .TH SIGSETOPS 3 2005-11-17 "Linux 2.6.14" "Linux Programmer's Manual" |
| |
| .SH NAME |
| sigemptyset, sigfillset, sigaddset, sigdelset, sigismember \- POSIX |
| signal set operations. |
| |
| .SH SYNOPSIS |
| .B #include <signal.h> |
| .sp |
| .BI "int sigemptyset(sigset_t *" set ); |
| .sp |
| .BI "int sigfillset(sigset_t *" set ); |
| .sp |
| .BI "int sigaddset(sigset_t *" set ", int " signum ); |
| .sp |
| .BI "int sigdelset(sigset_t *" set ", int " signum ); |
| .sp |
| .BI "int sigismember(const sigset_t *" set ", int " signum ); |
| |
| .SH DESCRIPTION |
| The |
| .BR sigsetops (3) |
| functions allow the manipulation of POSIX signal sets. |
| .PP |
| .BR sigemptyset () |
| initializes the signal set given by |
| .I set |
| to empty, with all signals excluded from the set. |
| .PP |
| .BR sigfillset () |
| initializes |
| .I set |
| to full, including all signals. |
| .PP |
| .BR sigaddset () |
| and |
| .BR sigdelset () |
| add and delete respectively signal |
| .I signum |
| from |
| .IR set . |
| .PP |
| .BR sigismember () |
| tests whether |
| .I signum |
| is a member of |
| .IR set . |
| .SH "RETURN VALUE" |
| .BR sigemptyset (), |
| .BR sigfillset (), |
| .BR sigaddset (), |
| and |
| .BR sigdelset () |
| return 0 on success and \-1 on error. |
| .PP |
| .BR sigismember () |
| returns 1 if |
| .I signum |
| is a member of |
| .IR set , |
| 0 if |
| .I signum |
| is not a member, and \-1 on error. |
| .SH ERRORS |
| .TP |
| .B EINVAL |
| .I sig |
| is not a valid signal. |
| .SH "CONFORMING TO" |
| POSIX |
| .SH "GLIBC NOTES" |
| If the _GNU_SOURCE feature test macro is defined, then <signal.h> |
| exposes three other functions for manipulating signal |
| sets. |
| .TP |
| .BI "int sigisemptyset(sigset_t *" set ); |
| returns 1 if |
| .I set |
| contains no signals, and 0 otherwise. |
| .TP |
| .BI "int sigorset(sigset_t *" dest ", sigset_t *" left \ |
| ", sigset_t *" right ); |
| places the union of the sets |
| .I left |
| and |
| .I right |
| in |
| .IR dest . |
| .TP |
| .BI "int sigandset(sigset_t *" dest ", sigset_t *" left \ |
| ", sigset_t *" right ); |
| places the intersection of the sets |
| .I left |
| and |
| .I right |
| in |
| .IR dest . |
| .PP |
| .BR sigorset () |
| and |
| .BR sigandset () |
| return 0 on success, and \-1 on failure. |
| .PP |
| These functions are non-standard (a few other systems provide similar |
| functions) and their use should be avoided in portable applications. |
| .SH "SEE ALSO" |
| .BR sigaction (2), |
| .BR sigpending (2), |
| .BR sigprocmask (2), |
| .BR sigsuspend (2) |