libf2c/libU77/alarm_.c

   1 /* Copyright (C) 1997, 2001 Free Software Foundation, Inc.
   2 This file is part of GNU Fortran libU77 library.
   3
   4 This library is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU Library General Public License as published
   6 by the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 GNU Fortran is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with GNU Fortran; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #if HAVE_UNISTD_H
  24 #  include <unistd.h>
  25 #endif
  26
  27 #include <errno.h>              /* for ENOSYS */
  28 #include "f2c.h"
  29
  30 #ifndef RETSIGTYPE
  31 /* we shouldn't rely on this... */
  32 #define RETSIGTYPE void
  33 #endif
  34 typedef RETSIGTYPE (*sig_type) ();
  35
  36 #include <signal.h>
  37 typedef int (*sig_proc) (int);
  38
  39 #ifndef SIG_ERR
  40 #define SIG_ERR ((sig_type) -1)
  41 #endif
  42
  43 integer
  44 G77_alarm_0 (integer * seconds, sig_proc proc)
  45 {
  46   int status;
  47 #if defined (HAVE_ALARM) && defined (SIGALRM)
  48   if (signal (SIGALRM, (sig_type) proc) == SIG_ERR)
  49     status = -1;
  50   else
  51     status = alarm (*seconds);
  52 #else /* ! HAVE_ALARM || ! SIGALRM */
  53   errno = ENOSYS;
  54   status = -1;
  55 #endif
  56   return status;
  57 }