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OpenSolaris 2009.06 - man page for sigsuspend (opensolaris section 2)

sigsuspend(2)				   System Calls 			    sigsuspend(2)

       sigsuspend - install a signal mask and suspend caller until signal

       #include <signal.h>

       int sigsuspend(const sigset_t *set);

       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, 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 signals that cannot be  ignored  (see  signal.h(3HEAD)).  This
       restriction is silently imposed by the system.

       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.

       The sigsuspend() function will fail if:

       EINTR	A signal was caught by the caller and control was returned from the signal catch-
		ing function.

       The sigsuspend() function may fail if:

       EFAULT	 The set argument points to an illegal address.

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

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

       sigaction(2),  sigprocmask(2),  sigwait(2),  signal(3C),  signal.h(3HEAD),  sigsetops(3C),

       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 sigsus-
       pend(), 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 5.11				   24 Jun 2001				    sigsuspend(2)

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