redhat man page for gsignal

GSIGNAL(3)						     Linux Programmer's Manual							GSIGNAL(3)

NAME
       gsignal, ssignal - software signal facility

SYNOPSIS
       #include <signal.h>

       typedef void (*sighandler_t)(int);

       int gsignal(signum);

       sighandler_t ssignal(int signum, sighandler_t action);

DESCRIPTION
       Don't  use  these  functions  under  Linux.  Due to a historical mistake, under Linux these functions are aliases for raise() and signal(),
       respectively.

       Elsewhere, on SYSV-like systems, these functions implement software signalling, entirely independent of the classical signal and kill func-
       tions.  The  function  ssignal()  defines the action to take when the software signal with number signum is raised using the function gsig-
       nal(), and returns the previous such action or SIG_DFL.	The function gsignal() does the following: if no action (or  the  action  SIG_DFL)
       was  specified  for  signum,  then it does nothing and returns 0.  If the action SIG_IGN was specified for signum, then it does nothing and
       returns 1.  Otherwise, it resets the action to SIG_DFL and calls the action function with parameter signum, and returns the value  returned
       by that function.  The range of possible values signum varies (often 1-15 or 1-17).

CONFORMING TO
       SVID2, XPG2.  These functions are available under AIX, DG-UX, HPUX, SCO, Solaris, Tru64.  They are called obsolete under most of these sys-
       tems, and are broken under Linux libc and glibc.  Some systems also have gsignal_r() and ssignal_r().

SEE ALSO
       kill(2), signal(2), raise(3)

notGNU								    2002-08-25								GSIGNAL(3)