external/gpl2/xcvs/dist/src/exithandle.c

   1 /*
   2  *    Copyright (c) 2003, Derek Price and Ximbiot <http://ximbiot.com>
   3  *
   4  *    You may distribute under the terms of the GNU General Public License
   5  *    as specified in the README file that comes with the CVS source
   6  *    distribution.
   7  *
   8  * This is a convenience wrapper for some of the functions in lib/sighandle.c.
   9  */
  10
  11 #include "cvs.h"
  12
  13 /*
  14  * Register a handler for all signals.
  15  */
  16 void
  17 signals_register (RETSIGTYPE (*handler)(int))
  18 {
  19 #ifndef DONT_USE_SIGNALS
  20 #ifdef SIGABRT
  21         (void) SIG_register (SIGABRT, handler);
  22 #endif
  23 #ifdef SIGHUP
  24         (void) SIG_register (SIGHUP, handler);
  25 #endif
  26 #ifdef SIGINT
  27         (void) SIG_register (SIGINT, handler);
  28 #endif
  29 #ifdef SIGQUIT
  30         (void) SIG_register (SIGQUIT, handler);
  31 #endif
  32 #ifdef SIGPIPE
  33         (void) SIG_register (SIGPIPE, handler);
  34 #endif
  35 #ifdef SIGTERM
  36         (void) SIG_register (SIGTERM, handler);
  37 #endif
  38 #endif /* !DONT_USE_SIGNALS */
  39 }
  40
  41
  42
  43 /*
  44  * Register a handler for all signals and exit.
  45  */
  46 void
  47 cleanup_register (void (*handler) (void))
  48 {
  49     atexit (handler);
  50
  51     /* Always calling this function before any other exit handlers guarantees
  52      * that signals will be blocked by the time the other exit handlers are
  53      * called.
  54      *
  55      * SIG_beginCrSect will be called once for each handler registered via
  56      * cleanup_register, but there is no unregister routine for atexit() and
  57      * this seems like minimal overhead.
  58      *
  59      * There is no reason to unblock signals again when the exit handlers are
  60      * done since the program will be exiting anyhow.
  61      */
  62     atexit (SIG_beginCrSect);
  63 }