sigset man page on HP-UX

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sigset(3C)							    sigset(3C)

       sigset(), sighold(), sigrelse(), sigignore() - signal management

       The system defines a set of signals that can be delivered to a process.
       The set of signals is defined in signal(5), along with the meaning  and
       side effects of each signal.  An alternate mechanism for handling these
       signals is defined here.	 The facilities described here should  not  be
       used in conjunction with the other facilities described under signal(2)
       and sigspace(2).

       allows the calling process to choose one of four	 ways  to  handle  the
       receipt of a specific signal.  sig specifies the signal and func speci‐
       fies the action handler.

       sig can be any one of the signals described under signal(5) except or

       func is assigned one of	four  values:  or  a  function	address.   The
       actions	prescribed  by	and are described under signal(5).  The action
       prescribed by and function address are described below:

       Hold signal.

			 The signal sig is held	 upon  receipt.	  Any  pending
			 signal	 of  this  signal type remains held.  Only one
			 signal of each type is held.

			 Note: the signals and cannot be held.

       function address	 Catch signal.

			 func must be a pointer to  a  function,  the  signal-
			 catching  handler,  that  is  called  when signal sig
			 occurs.  specifies that the process calls this	 func‐
			 tion  upon receipt of signal sig.  Any pending signal
			 of this type is released.  This  handler  address  is
			 retained  across calls to the other signal management
			 functions listed here.	 Upon receipt of  signal  sig,
			 the  receiving	 process  executes the signal-catching
			 function pointed to by func as described  under  sig‐
			 nal(5) with the following differences:

			 Before	  calling  the	signal-catching	 handler,  the
			 defined action of sig	is  set	 to  During  a	normal
			 return	 from the signal-catching handler, the defined
			 action is restored to func and	 any  held  signal  of
			 this	type   is   released.	If  a  non-local  goto
			 (longjmp(3C)) is taken, must be called to restore the
			 defined action to func and release any held signal of
			 this type.

       holds the signal sig.  restores the defined action of sig to that spec‐
       ified previously by and are used to establish critical regions of code.
       is analogous to raising the priority level and deferring or  holding  a
       signal until the priority is lowered by

       sets the action for signal sig to (see signal(5)).

       Upon  successful	 completion, returns the previous value of the defined
       action for the specified signal sig.  Otherwise, a value of is returned
       and is set to indicate the error.  is defined in

       For  the	 other functions, a 0 value indicates that the call succeeded.
       A -1 return value indicates an error occurred and is  set  to  indicate
       the reason.

       fails  and the defined action for sig is not changed if any of the fol‐
       lowing occur:

	      The	     func argument points to  memory  that  is	not  a
			     valid  part  of the process address space.	 Reli‐
			     able detection of this  error  is	implementation

       and  and	 fail  and the defined action for sig is not changed if any of
       the following occur:

	      sig	     is not a valid signal number.

	      An attempt is made to ignore, hold, or supply a handler
			     for a signal that cannot  be  ignored,  held,  or
			     caught; see signal(5).

       These  signal  facilities  should  not be used in conjunction with sig‐
       nal(2) and sigspace(2).

       kill(1), kill(2), pause(2), signal(2), sigspace(2), wait(2), abort(3C),
       setjmp(3C), sigpause(3C), signal(5).


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