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(intsignum);

       sighandler_t ssignal(int signum, sighandler_t action);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       gsignal(), ssignal(): _SVID_SOURCE

DESCRIPTION
       Don't use these functions under Linux.  Due to a historical mistake, under Linux these functions are aliases for raise(3)
       and signal(2), respectively.

       Elsewhere, on System V-like systems, these functions implement software signaling, entirely independent of the  classical
       signal(2)  and kill(2) functions.  The function ssignal() defines the action to take when the software signal with number
       signum is raised using the function gsignal(), 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 argument signum, and returns the value returned by that function.  The range
       of possible values signum varies (often 1-15 or 1-17).

CONFORMING TO
       These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64.  They are called obsolete under most of these
       systems, 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)

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



                                                           2007-07-26                                                 GSIGNAL(3)