unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (SunOS-4.1.3)
Page:
Section:
Apropos / Subsearch:
optional field

SIGSETOPS(3V)                                                    SIGSETOPS(3V)



NAME
       sigsetops, sigaddset, sigdelset, sigfillset, sigemptyset, sigismember -
       manipulate signal sets

SYNOPSIS
       #include <&lt;signal.h>&gt;

       int sigaddset(set, signo)
       sigset_t *set;
       int signo;

       int sigdelset(set, signo)
       sigset_t *set;
       int signo;

       int sigfillset(set)
       sigset_t *set;

       int sigemptyset(set)
       sigset_t *set;

       int sigismember(set, signo)
       sigset_t *set
       int signo;

DESCRIPTION
       The sigsetops primitives manipulate sets of signals.  They  operate  on
       data  objects  addressable  by the application.  They do not operate 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.

       sigaddset()  and sigdelset() respectively add and delete the individual
       signal specified by the value of signo from the signal set  pointed  to
       by set.

       sigemptyset()  initializes  the  signal set pointed to by set such that
       all signals defined in this standard are excluded.

       sigfillset() initializes the signal set pointed to by set such that all
       signals defined in this standard are included.

       Applications  shall  call either sigemptyset() or sigfillset() at least
       once for each object of type sigset_t prior to any other  use  of  that
       object.  If such an object is not initialized in this way, but is none-
       theless supplied as an argument to  any  of  sigaddset(),  sigdelset(),
       sigismember(),  sigaction(),  sigprocmask(),  sigpending(),  or sigsus-
       pend() the results are undefined.

       sigismember() tests whether the signal specified by the value of  signo
       is a member of the set pointed to by set.

RETURN VALUES
       sigismember() returns:

       1      if the specified signal is a member of set.

       0      if the specified signal is not a member of set.

       -1     if an error is detected, and sets errno to indicate the error.

       The other functions return:

       0      on success.

       -1     on failure and set errno to indicate the error.

ERRORS
       For  each  of  the  following conditions, if the condition is detected,
       sigaddset(), sigdelset(), and sigismember() set errno to:

       EINVAL         signo is an invalid or unsupported signal number.

SEE ALSO
       sigaction(3V), sigpending(2V), sigprocmask(2V)



                                21 January 1990                  SIGSETOPS(3V)