SIGSETOPS(3C-SVR4)  RISC/os Reference Manual   SIGSETOPS(3C-SVR4)



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 fol-
     lowing 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.





                        Printed 11/19/92                   Page 1

SIGSETOPS(3C-SVR4)  RISC/os Reference Manual   SIGSETOPS(3C-SVR4)



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

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 suc-
     cessful 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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