kc3-lang/gnulib/lib/sig-handler.h

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• Hash : 4b2f21b3
  Author :
  Date : 2008-06-21T07:08:49
  

  Use sigaction module rather than signal().
  
  * modules/c-stack (Depends-on): Add sigaction.
  * modules/fatal-signal (Depends-on): Likewise.
  * modules/nanosleep (Depends-on): Likewise.
  * modules/sigprocmask (Files): Add sig-handler.h.
  * modules/sigaction (Files): Likewise.
  * lib/sig-handler.h (get_handler): New file, suggested by Paul
  Eggert.
  * lib/c-stack.c (SIGACTION_WORKS): Simplify conditions.
  (c_stack_action) [!SIGACTION_WORKS]: Use sigaction, not signal.
  * lib/fatal-signal.c (uninstall_handlers, install_handlers)
  (init_fatal_signals): Likewise.
  * lib/nanosleep.c (rpl_nanosleep): Likewise.
  (siginterrupt): Delete fallback.
  * lib/sigprocmask.c (handler_t): Delete.
  (old_handlers): Use sa_handler_t instead.
  * m4/nanosleep.m4 (gl_PREREQ_NANOSLEEP): Drop check for
  siginterrupt.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• lib/sig-handler.h

• /* Convenience declarations when working with <signal.h>.
  
     Copyright (C) 2008 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #ifndef _GL_SIG_HANDLER_H
  #define _GL_SIG_HANDLER_H
  
  #include <signal.h>
  
  /* Convenience type when working with signal handlers.  */
  typedef void (*sa_handler_t) (int);
  
  /* Return the handler of a signal, as a sa_handler_t value regardless
     of its true type.  The resulting function can be compared to
     special values like SIG_IGN but it is not portable to call it.  */
  static inline sa_handler_t
  get_handler (struct sigaction const *a)
  {
  #ifdef SA_SIGINFO
    /* POSIX says that special values like SIG_IGN can only occur when
       action.sa_flags does not contain SA_SIGINFO.  But in Linux 2.4,
       for example, sa_sigaction and sa_handler are aliases and a signal
       is ignored if sa_sigaction (after casting) equals SIG_IGN.  So
       use (and cast) sa_sigaction in that case.  */
    if (a->sa_flags & SA_SIGINFO)
      return (sa_handler_t) a->sa_sigaction;
  #endif
    return a->sa_handler;
  }
  
  #endif /* _GL_SIG_HANDLER_H */
  

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