86 lines
1.8 KiB
Groff
86 lines
1.8 KiB
Groff
.TH SIGSET 3
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.SH NAME
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sigset, sigaddset, sigdelset, sigemptyset, sigfillset, sigismember \- manipulate signal sets
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.SH SYNOPSIS
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.ft B
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#include <signal.h>
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.nf
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int sigaddset(sigset_t *\fIset\fP, int \fIsig\fP)
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int sigdelset(sigset_t *\fIset\fP, int \fIsig\fP)
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int sigemptyset(sigset_t *\fIset\fP)
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int sigfillset(sigset_t *\fIset\fP)
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int sigismember(const sigset_t *\fIset\fP, int \fIsig\fP)
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.fi
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.ft P
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.SH DESCRIPTION
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The system calls that handle signals, such as
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.BR sigaction (2)
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and
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.BR sigprocmask (2)
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use sets of signals to keep a process from being interrupted by those
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signals while executing a signal handler or a critical code segment. These
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signal sets are manipulated by the following functions:
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.TP 5
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.B "int sigaddset(sigset_t *\fIset\fP, int \fIsig\fP)"
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Add signal
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.I sig
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to the signal set referenced by
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.IR set .
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.TP
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.B "int sigdelset(sigset_t *\fIset\fP, int \fIsig\fP)"
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Remove signal
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.I sig
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from the signal set referenced by
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.IR set .
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.TP
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.B "int sigemptyset(sigset_t *\fIset\fP)"
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Initialize the signal set referenced by
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.I set
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to an empty set.
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.TP
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.B "int sigfillset(sigset_t *\fIset\fP)"
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Initialize the signal set referenced by
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.I set
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to an full set, i.e. all signals are in the set.
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.TP
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.B "int sigismember(const sigset_t *\fIset\fP, int \fIsig\fP)"
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Return
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.B 1
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if the signal
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.I sig
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is present in the set referenced by
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.IR set ,
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.B 0
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otherwise.
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.SH "SEE ALSO"
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.BR sigaction (2),
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.BR sigpending (2),
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.BR sigprocmask (2),
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.BR sigsuspend (2).
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.SH DIAGNOSTICS
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All functions except
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.B sigismember
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return
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.B 0
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on success.
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.B Sigismember
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returns
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.B 0
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or
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.B 1
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on success. They return
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.B \-1
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with error code
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.B EINVAL
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for an invalid signal number. (They do not use
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.B EFAULT
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for a bad
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.I set
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address, but will simply cause a segmentation violation.)
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.SH AUTHOR
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Kees J. Bot (kjb@cs.vu.nl)
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.\"
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.\" $PchId: sigset.3,v 1.2 1996/04/11 06:39:09 philip Exp $
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