db/sig.c

   1 /*
   2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include <libxfs.h>
  34 #include <signal.h>
  35 #include "sig.h"
  36
  37 static int      gotintr;
  38 static sigset_t intrset;
  39
  40 static void
  41 interrupt(int sig, siginfo_t *info, void *uc)
  42 {
  43         gotintr = 1;
  44 }
  45
  46 void
  47 blockint(void)
  48 {
  49         sigprocmask(SIG_BLOCK, &intrset, NULL);
  50 }
  51
  52 void
  53 clearint(void)
  54 {
  55         gotintr = 0;
  56 }
  57
  58 void
  59 init_sig(void)
  60 {
  61         struct sigaction sa;
  62
  63         memset(&sa, 0, sizeof(sa));
  64         sa.sa_sigaction = interrupt;
  65         sigaction(SIGINT, &sa, NULL);
  66         sigemptyset(&intrset);
  67         sigaddset(&intrset, SIGINT);
  68 }
  69
  70 int
  71 seenint(void)
  72 {
  73         return gotintr;
  74 }
  75
  76 void
  77 unblockint(void)
  78 {
  79         sigprocmask(SIG_UNBLOCK, &intrset, NULL);
  80 }