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

       gsignal, ssignal - software signal facility

       #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

       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 noth-
       ing  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).

       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 ssig-

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

       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at

                                  2007-07-26                        GSIGNAL(3)