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40 lines
1.2 KiB
Groff
40 lines
1.2 KiB
Groff
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.\"
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.\" $Id: sigpause.2,v 1.1 1997/02/27 07:32:16 gdr Exp $
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.\"
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.TH SIGPAUSE 2 "19 January 1997" GNO "System Calls"
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.SH NAME
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.BR sigpause
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\- suspend process until a signal arrives
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.SH SYNOPSIS
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#include <signal.h>
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.sp 1
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int
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\fBsigpause\fR(long int \fImask\fR);
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.SH DESCRIPTION
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.BR sigpause
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suspends execution of the calling process until a signal arrives. The
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.IR mask
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parameter is assigned to the set of blocked signals (see
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.BR sigsetmask (2)),
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and then the process is paused. When a signal arrives, the regular
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signal handler (if any) is executed, and then the original signal mask
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is restored before returning to the caller. Usually
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.IR mask
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is zero to pause until any signal arrives.
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.LP
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.BR sigpause
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is normally used in situations where one must protect a critical section.
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A typical use begins with sigblock to block a signal (and enable mutual
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exclusion); variables modified on the occurance of that signal are then
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manipulated, code is executed, etc. To end the critical section and
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wait for more work, sigpause is called.
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.SH RETURN VALUE
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.BR sigpause
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always returns an error (-1) and sets
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.BR errno
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to EINTR.
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.SH SEE ALSO
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.BR signal (2),
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.BR sigblock (2),
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.BR sigsetmask (2)
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