Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
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, sig-
       suspend() 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  sig-
       nal.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 sig-
       nal'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)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO | NOTES

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=sigsuspend&sektion=2&manpath=SunOS+5.10>

home | help