Name
sigsuspend — wait for a signal
Synopsis
#include <signal.h>
int
sigsuspend( |
const sigset_t * |
mask); |
DESCRIPTION
sigsuspend() temporarily
replaces the signal mask of the calling process with the mask
given by mask and
then suspends the process until delivery of a signal whose
action is to invoke a signal handler or to terminate a
process.
If the signal terminates the process, then sigsuspend() does not return. If the signal
is caught, then sigsuspend()
returns after the signal handler returns, and the signal mask
is restored to the state before the call to sigsuspend().
It is not possible to block SIGKILL or SIGSTOP; specifying
these signals in mask, has no effect on the
process's signal mask.
RETURN VALUE
sigsuspend() always returns
−1, normally with the error EINTR.
ERRORS
- EFAULT
-
mask points
to memory which is not a valid part of the process
address space.
- EINTR
-
The call was interrupted by a signal.
CONFORMING TO
POSIX.1-2001.
NOTES
Normally, sigsuspend() is
used in conjunction with sigprocmask(2) in order to
prevent delivery of a signal during the execution of a
critical code section. The caller first blocks the signals
with sigprocmask(2). When the
critical code has completed, the caller then waits for the
signals by calling sigsuspend()
with the signal mask that was returned by sigprocmask(2) (in the
oldset
argument).
See sigsetops(3) for details on
manipulating signal sets.
SEE ALSO
kill(2), pause(2), sigaction(2), signal(2), sigprocmask(2), sigwaitinfo(2), sigsetops(3), signal(7)
Copyright (c) 2005 Michael Kerrisk
based on earlier work by faith@cs.unc.edu and
Mike Battersby <mib@deakin.edu.au>
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2005-09-15, mtk, Created new page by splitting off from sigaction.2
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