sigprocmask man page on SmartOS

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       sigprocmask - change or examine caller's signal mask

       #include <signal.h>

       int sigprocmask(int how, const sigset_t *restrict set,
	    sigset_t *restrict oset);

       The  sigprocmask()  function is used to examine and/or change the call‐
       er's signal mask. If the value is  SIG_BLOCK, the set pointed to by the
       set  argument  is  added	 to  the  current signal mask. If the value is
       SIG_UNBLOCK, the set pointed by the  set argument is removed  from  the
       current	signal	mask. If the value is  SIG_SETMASK, the current signal
       mask is replaced by the set pointed to by the   set  argument.  If  the
       oset  argument  is  not	NULL, the previous mask is stored in the space
       pointed to by oset. If the value of the	 set  argument	is  NULL,  the
       value   how  is	not  significant  and  the  caller's  signal  mask  is
       unchanged; thus, the call  can  be  used	 to  inquire  about  currently
       blocked	signals.  If  the  set	or  oset argument points to an invalid
       address, the behavior is undefined and errno may be set to EFAULT.

       If there are any pending unblocked signals after the call  to  sigproc‐
       mask(), at least one of those signals will be delivered before the call
       to sigprocmask() returns.

       It is not possible to block signals that cannot be  caught  or  ignored
       (see sigaction(2)). It is also not possible to block or unblock SIGCAN‐
       CEL, as SIGCANCEL is reserved for the implementation  of	 POSIX	thread
       cancellation   (see   pthread_cancel(3C)	  and  cancellation(5)).  This
       restriction is silently enforced by the standard C library.

       If sigprocmask() fails, the caller's signal mask is not changed.

       Upon successful completion, 0 is returned. Otherwise,  −1  is  returned
       and errno is set to indicate the error.

       The sigprocmask() function will fail if:

		 The  value  of	 the  how  argument is not equal to one of the
		 defined values.

       The sigprocmask() function may fail if:

		 The set or oset argument points to an illegal address.

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

       │Interface Stability │ Standard		│
       │MT-Level	    │ Async-Signal-Safe │

       sigaction(2), pthread_cancel(3C), pthread_sigmask(3C), signal(3C), sig‐
       nal.h(3HEAD), sigsetops(3C), attributes(5), cancellation(5)

       The  call  to  sigprocmask()  affects  only the calling thread's signal
       mask.  It is identical to a call to pthread_sigmask(3C).

       Signals that are generated synchronously should not be masked. If  such
       a signal is blocked and delivered, the receiving process is killed.

				 Mar 23, 2005			SIGPROCMASK(2)

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