sigsetops(3C)                    UNIX System V                    sigsetops(3C)


NAME
      sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate
      sets of signals

SYNOPSIS
      #include <signal.h>

      int sigemptyset (sigsett *set);

      int sigfillset (sigsett *set);

      int sigaddset (sigsett *set, int signo);

      int sigdelset (sigsett *set, int signo);

      int sigismember (sigsett *set, int signo);

DESCRIPTION
      These functions manipulate sigset_t data types, representing the set of
      signals supported by the implementation.

      sigemptyset initializes the set pointed to by set to exclude all signals
      defined by the system.

      sigfillset initializes the set pointed to by set to include all signals
      defined by the system.

      sigaddset adds the individual signal specified by the value of signo to
      the set pointed to by set.

      sigdelset deletes the individual signal specified by the value of signo
      from the set pointed to by set.

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

      Any object of type sigset_t must be initialized by applying either
      sigemptyset or sigfillset before applying any other operation.

      sigaddset, sigdelset and sigismember will fail if the following is true:

      EINVAL         The value of the signo argument is not a valid signal
                     number.

      sigfillset will fail if the following is true:

      EFAULT         The set argument specifies an invalid address.

SEE ALSO
      sigaction(2), sigprocmask(2), sigpending(2), sigsuspend(2), signal(5).




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sigsetops(3C)                    UNIX System V                    sigsetops(3C)


DIAGNOSTICS
      Upon successful completion, the sigismember function returns a value of
      one if the specified signal is a member of the specified set, or a value
      of zero if it is not. Upon successful completion, the other functions
      return a value of zero. Otherwise a value of -1 is returned and errno is
      set to indicate the error.
















































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