sigaction.h 2.8 KB

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  1. /* The proper definitions for Linux's sigaction.
  2. Copyright (C) 1993, 94, 95, 96, 97, 98, 2000 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Library General Public License as
  6. published by the Free Software Foundation; either version 2 of the
  7. License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Library General Public License for more details.
  12. You should have received a copy of the GNU Library General Public
  13. License along with the GNU C Library; see the file COPYING.LIB. If not,
  14. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  15. Boston, MA 02111-1307, USA. */
  16. #ifndef _SIGNAL_H
  17. # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
  18. #endif
  19. /* Structure describing the action to be taken when a signal arrives. */
  20. struct sigaction
  21. {
  22. /* Signal handler. */
  23. #ifdef __USE_POSIX199309
  24. union
  25. {
  26. /* Used if SA_SIGINFO is not set. */
  27. __sighandler_t sa_handler;
  28. /* Used if SA_SIGINFO is set. */
  29. void (*sa_sigaction) __PMT ((int, siginfo_t *, void *));
  30. }
  31. __sigaction_handler;
  32. # define sa_handler __sigaction_handler.sa_handler
  33. # define sa_sigaction __sigaction_handler.sa_sigaction
  34. #else
  35. __sighandler_t sa_handler;
  36. #endif
  37. /* Additional set of signals to be blocked. */
  38. __sigset_t sa_mask;
  39. /* Special flags. */
  40. int sa_flags;
  41. /* Restore handler. */
  42. void (*sa_restorer) __PMT ((void));
  43. };
  44. /* Bits in `sa_flags'. */
  45. #define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */
  46. #define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */
  47. #define SA_SIGINFO 4 /* Invoke signal-catching function with
  48. three arguments instead of one. */
  49. #if defined __USE_UNIX98 || defined __USE_MISC
  50. # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */
  51. # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */
  52. # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when
  53. its handler is being executed. */
  54. # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */
  55. #endif
  56. #ifdef __USE_MISC
  57. # define SA_INTERRUPT 0x20000000 /* Historical no-op. */
  58. /* Some aliases for the SA_ constants. */
  59. # define SA_NOMASK SA_NODEFER
  60. # define SA_ONESHOT SA_RESETHAND
  61. # define SA_STACK SA_ONSTACK
  62. #endif
  63. /* Values for the HOW argument to `sigprocmask'. */
  64. #define SIG_BLOCK 0 /* Block signals. */
  65. #define SIG_UNBLOCK 1 /* Unblock signals. */
  66. #define SIG_SETMASK 2 /* Set the set of blocked signals. */