Signal catching

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sigsuspend

sigsuspend(2)							System Calls Manual						     sigsuspend(2)

NAME

       sigsuspend - wait for a signal

SYNOPSIS

DESCRIPTION

       The  function  replaces	the  current  signal mask of the calling thread with the set of signals pointed to by and then suspends the thread
       until delivery of a signal whose action is either to execute a signal-catching function or to terminate the process.  This will	not  cause
       any other signals that may have been pending on the process to become pending on the thread.

       If  the	action	is  to	terminate  the process then will never return. If the action is to execute  a  signal-catching function, then will
       return after the signal-catching function returns, with the signal mask restored to the set that existed prior to the call.

       It is not possible to block signals that cannot be ignored. This is enforced by the system without causing an error to be indicated.

RETURN VALUE

       Since suspends thread execution indefinitely, there is no successful completion return value. If a return occurs, -1 is returned and is set
       to indicate the error.

ERRORS

       The function will fail if:

	      A signal is caught by the calling process and control is returned from
			     the signal-catching function.

	      sigmask	     points to an invalid address.  The reliable detection of this error is implementation-dependent.

APPLICATION USAGE

   Threads Considerations
       Since  blocked  signal masks are maintained at the thread level, modifies only the calling thread's blocked signal mask.  suspends only the
       calling thread until it receives a signal.

       If other threads in the process do not block the signal, the signal may be delivered to another thread in the process and the thread in may
       continue waiting.  For this reason, the use of sigwait(2) is recommended instead of for multi-threaded applications.

       For more information regarding signals and threads, refer to signal(5).

   LWP (Lightweight Processes) Considerations
       modifies only the calling LWP's signal mask and suspends only the calling LWP until receipt of a signal.

AUTHOR

       was derived from the IEEE POSIX 1003.1-1988 Standard.

SEE ALSO

       pause(2), sigaction(2), sigpending(2), sigprocmask(2), sigsetops(3C), sigwait(2), signal(5).

CHANGE HISTORY

       First released in Issue 3.

       Entry included for alignment with the POSIX.1-1988 standard.

STANDARDS CONFORMANCE

																     sigsuspend(2)

Programming