src/lxc/lxc_utils.h

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <dlezcano at fr.ibm.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #ifndef _utils_h
  24 #define _utils_h
  25
  26 #define LXC_TTY_HANDLER(s) \
  27         static struct sigaction lxc_tty_sa_##s;                         \
  28         static void tty_##s##_handler(int sig, siginfo_t *info, void *ctx) \
  29         {                                                               \
  30                 if (lxc_tty_sa_##s.sa_handler == SIG_DFL ||             \
  31                     lxc_tty_sa_##s.sa_handler == SIG_IGN)               \
  32                         return;                                         \
  33                 (*lxc_tty_sa_##s.sa_sigaction)(sig, info, ctx); \
  34         }
  35
  36 #define LXC_TTY_ADD_HANDLER(s) \
  37         do { \
  38                 struct sigaction sa; \
  39                 sa.sa_sigaction = tty_##s##_handler; \
  40                 sa.sa_flags = SA_SIGINFO; \
  41                 sigfillset(&sa.sa_mask); \
  42                 /* No error expected with sigaction. */ \
  43                 sigaction(s, &sa, &lxc_tty_sa_##s); \
  44         } while (0)
  45
  46 #define LXC_TTY_DEL_HANDLER(s) \
  47         do { \
  48                 sigaction(s, &lxc_tty_sa_##s, NULL); \
  49         } while (0)
  50
  51 #endif