'\" te
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.TH SIGSUSPEND 2 "Jun 24, 2001"
.SH NAME
sigsuspend \- install a signal mask and suspend caller until signal
.SH SYNOPSIS
.LP
.nf
#include <signal.h>

\fBint\fR \fBsigsuspend\fR(\fBconst sigset_t *\fR\fIset\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBsigsuspend()\fR function replaces the caller's signal mask with the set
of signals pointed to by the \fIset\fR argument and  suspends the caller until
delivery of a signal whose action is either to execute a signal catching
function or to terminate the process. If the \fIset\fR argument points to an
invalid address, the behavior is undefined and \fBerrno\fR may be set to
\fBEFAULT\fR.
.sp
.LP
If the action is to terminate the process, \fBsigsuspend()\fR does not return.
If the action is to execute a signal catching function, \fBsigsuspend()\fR
returns after the signal catching function returns. On return, the signal mask
is restored to the set that existed before the  call to \fBsigsuspend()\fR.
.sp
.LP
It is not possible to block signals that cannot be ignored (see
\fBsignal.h\fR(3HEAD)). This restriction is silently imposed by the system.
.SH RETURN VALUES
.sp
.LP
Since \fBsigsuspend()\fR suspends the caller's execution indefinitely, there is
no successful completion return value. On failure, it returns \fB\(mi1\fR and
sets \fBerrno\fR to indicate the error.
.SH ERRORS
.sp
.LP
The \fBsigsuspend()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEINTR\fR\fR
.ad
.RS 9n
A signal was caught by the caller and control was returned from the signal
catching function.
.RE

.sp
.LP
The \fBsigsuspend()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEFAULT\fR\fR
.ad
.RS 10n
The \fIset\fR argument points to an illegal address.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	Async-Signal-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBsigaction\fR(2), \fBsigprocmask\fR(2), \fBsigwait\fR(2), \fBsignal\fR(3C),
\fBsignal.h\fR(3HEAD), \fBsigsetops\fR(3C), \fBattributes\fR(5)
.SH NOTES
.sp
.LP
If the caller specifies more than one unblocked signal in the mask to
\fBsigsuspend()\fR, more than one signal might be processed before the call to
\fBsigsuspend()\fR returns.
.sp
.LP
While the caller is executing the signal handler that interrupted its call to
\fBsigsuspend()\fR, its signal mask is the one passed to \fBsigsuspend()\fR,
modified as usual by the signal mask specification in the signal's
\fBsigaction\fR(2) parameters.  The caller's signal mask is not restored to its
previous value until the caller returns from all the signal handlers that
interrupted \fBsigsuspend()\fR.