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       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),

       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).


       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().


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


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