Signal catching

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LEARN ABOUT SUNOS

sigsuspend

sigsuspend(2)							   System Calls 						     sigsuspend(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  set  argument
       points to an invalid address, the behavior is undefined and errno may be set to EFAULT.

       If  the	action is to terminate the process, sigsuspend() does not return.  If the action is to execute a signal catching function, sigsus-
       pend() 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 signals that cannot be ignored (see signal.h(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:

       EINTR	A signal was caught by the caller and control was returned from the signal catching function.

       The sigsuspend() function may fail if:

       EFAULT	The set argument points to an illegal address.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sigaction(2), sigprocmask(2), sigwait(2), signal(3C), signal.h(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 sigsus-
       pend(), 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 5.10							    24 Jun 2001 						     sigsuspend(2)

Programming