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System Callssigsuspend(2)


NAME

 sigsuspend - install a signal mask and suspend caller until signal

SYNOPSIS

 
#include <signal.h>
int sigsuspend(const sigset_t *set);

DESCRIPTION

 

The sigsuspend() function replaces the caller's signal mask with the set of signals pointed to by the set 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 action is to terminate the process, sigsuspend() does not return. If the action is to execute a signal catching function, sigsuspend() returns after the signal catching function returns. On return, the signal mask is restored to the set that existed before the call to sigsuspend().

It is not possible to block those signals that cannot be ignored (see signal(3HEAD)); this restriction is silently imposed by the system.

RETURN VALUES

 

Since sigsuspend() suspends the caller's execution indefinitely, there is no successful completion return value. On failure, it returns -1 and sets errno to indicate the error.

ERRORS

 

The sigsuspend() function will fail if:

EFAULT
The set argument points to an illegal address.
EINTR
A signal was caught by the caller and control was returned from the signal catching function.

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelAsync-Signal-Safe

SEE ALSO

 

sigaction(2), sigprocmask(2), sigwait(2), signal(3C), signal(3HEAD), sigsetops(3C), attributes (5)

NOTES

 

If the caller specifies more than one unblocked signal in the mask to sigsuspend(), more than one signal might be processed before the call to sigsuspend() returns.

While the caller is executing the signal handler that interrupted its call to sigsuspend(), its signal mask is the one passed to sigsuspend(), modified as usual by the signal mask specification in the signal's sigaction(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 sigsuspend().


SunOS 5.9Go To TopLast Changed 23 Jul 2001

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.