ssignal, gsignal - software signals


     #include <signal.h>

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

     int gsignal(int sig);


     The ssignal() and gsignal() functions implement  a  software
     facility similar to signal(3C). This facility is made avail-
     able 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). The  ssignal()
     function  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.

     The gsignal() raises the signal identified by its  argument,

     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. The  gsignal()  function  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


     See attributes(5) for descriptions of the  following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | MT-Level                    | Unsafe                      |


     raise(3C), signal(3C), attributes(5)

Man(1) output converted with man2html