sigemptyset man page on Tru64

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sigemptyset(3)							sigemptyset(3)

NAME
       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - Create and
       manipulates signal masks

SYNOPSIS
       #include <signal.h>

       int sigemptyset(
	       sigset_t *set ); int sigfillset(
	       sigset_t *set ); int sigaddset(
	       sigset_t *set,
	       int sig_number ); int sigdelset(
	       sigset_t *set,
	       int sig_number ); int sigismember(
	       sigset_t *set,
	       int sig_number );

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       sigemptyset(),	sigfillset(),	sigaddset(),   sigdelset()   sigismem‐
       ber():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

PARAMETERS
       Specifies the signal set.  Specifies the individual signal.

DESCRIPTION
       The sigemptyset(),sigfillset(),sigaddset()sigdelset() and sigismember()
       functions manipulate sets of signals. These functions operate  on  data
       objects	that  can  be  addressed by the application, not on any set of
       signals known to the system, such as the set blocked from delivery to a
       process or the set pending for a process.

       The sigemptyset() function initializes the signal set pointed to by the
       set parameter such that all  signals  are  excluded.  The  sigfillset()
       function	 initializes  the  signal  set pointed to by the set parameter
       such that all signals are included. A call to either  the  sigfillset()
       or sigemptyset() function must be made at least once for each object of
       the type sigset_t prior to any other use of that object.

       The sigaddset() and sigdelset() functions respectively add  and	delete
       the  individual	signal	specified by the sig_number parameter from the
       signal set specified by the set parameter. The  sigismember()  function
       tests  whether  the  sig_number parameter is a member of the signal set
       pointed to by the set parameter.

RETURN VALUES
       Upon successful completion, the sigismember() function returns a	 value
       of  1  if  the  specified signal is a member of the specified set, or a
       value of 0 (zero) if it is not. Upon successful completion,  the	 other
       functions  return  a value of 0. For all the preceding functions, if an
       error is detected, a value of -1 is returned and errno is set to	 indi‐
       cate the error.

ERRORS
       The sigfillset(), sigdelset(), sigismember(), and sigaddset() functions
       set errno to the specified values for  the  following  conditions:  The
       value of the sig_number parameter is not a valid signal number.

EXAMPLES
       To  generate  and  use a signal mask that blocks only the SIGINT signal
       from delivery, enter:

       #include <signal.h> int return_value; sigset_t newset;
	  .   .	  .    sigemptyset(&newset);	sigaddset(&newset,    SIGINT);
       return_value = sigprocmask (SIG_SETMASK, &newset, NULL);

SEE ALSO
       Functions: sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2)

       Files: signal(4)

       Standards: standards(5)

								sigemptyset(3)
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