ssignal(3C) — svr4 — mips UMIPS RISC/os 5.01



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



NAME
     ssignal, gsignal - software signals

SYNOPSIS
     #include <signal.h>

     int (*ssignal (int sig, int (*action) (int))) (int);

     int gsignal (int sig);

DESCRIPTION
     ssignal and gsignal implement a software facility similar to
     signal(2).  This facility is made available to users for
     their own purposes.

     Software signals made available to users are associated with
     integers in the inclusive range 1 through 17. A call to
     ssignal associates a procedure, action, with the software
     signal sig; the software signal, sig, is raised by a call to
     gsignal.  Raising a software signal causes the action esta-
     blished for that signal to be taken.

     The first argument to ssignal is a number identifying the
     type of signal for which an action is to be established. The
     second argument defines the action; it is either the name of
     a (user-defined) action function or one of the manifest con-
     stants SIG_DFL (default) or SIG_IGN (ignore).  ssignal
     returns the action previously established for that signal
     type; if no action has been established or the signal number
     is illegal, ssignal returns SIG_DFL.

     gsignal raises the signal identified by its argument, sig:

          If an action function has been established for sig,
          then that action is reset to SIG_DFL and the action
          function is entered with argument sig.  gsignal returns
          the value returned to it by the action function.

          If the action for sig is SIG_IGN, gsignal returns the
          value 1 and takes no other action.

          If the action for sig is SIG_DFL, gsignal returns the
          value 0 and takes no other action.

          If sig has an illegal value or no action was ever
          specified for sig, gsignal returns the value 0 and
          takes no other action.

SEE ALSO
     signal(2), sigset(2), raise(3C).





                        Printed 11/19/92                   Page 1
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