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Linux 2.6 - man page for sigsuspend (linux section 3posix)

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SIGSUSPEND(P)			    POSIX Programmer's Manual			    SIGSUSPEND(P)

NAME
       sigsuspend - wait for a signal

SYNOPSIS
       #include <signal.h>

       int sigsuspend(const sigset_t *sigmask);

DESCRIPTION
       The sigsuspend() function shall replace the current signal mask of the calling thread with
       the set of signals pointed to by sigmask and then suspend the thread until delivery  of	a
       signal  whose  action  is either to execute a signal-catching function or to terminate the
       process. This shall 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 sigsuspend() shall never return. If the
       action is to execute a signal-catching function, then sigsuspend() shall return after  the
       signal-catching	function  returns,  with the signal mask restored to the set that existed
       prior to the sigsuspend() 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  sigsuspend() suspends thread execution indefinitely, there is no successful comple-
       tion return value. If a return occurs, -1 shall be returned and errno set to indicate  the
       error.

ERRORS
       The sigsuspend() function shall fail if:

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

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       Normally, at the beginning of a critical code section,  a  specified  set  of  signals  is
       blocked using the sigprocmask() function.  When the thread has completed the critical sec-
       tion and needs to wait for the previously blocked signal(s), it pauses by calling  sigsus-
       pend() with the mask that was returned by the sigprocmask() call.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Signal Concepts , pause() , sigaction() , sigaddset() , sigdelset() , sigemptyset() , sig-
       fillset() , the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				    SIGSUSPEND(P)
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