sigaction.c 3.1 KB

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  1. /* Copyright (C) 1997,1998,1999,2000,2002,2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #include <errno.h>
  16. #include <signal.h>
  17. #include <string.h>
  18. #include <sys/syscall.h>
  19. /* The difference here is that the sigaction structure used in the
  20. kernel is not the same as we use in the libc. Therefore we must
  21. translate it here. */
  22. #include <bits/kernel_sigaction.h>
  23. #if defined __NR_rt_sigaction
  24. /* If ACT is not NULL, change the action for SIG to *ACT.
  25. If OACT is not NULL, put the old action for SIG in *OACT. */
  26. int
  27. __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  28. {
  29. int result;
  30. struct kernel_sigaction kact, koact;
  31. if (act) {
  32. kact.k_sa_handler = act->sa_handler;
  33. __memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  34. kact.sa_flags = act->sa_flags;
  35. # ifdef HAVE_SA_RESTORER
  36. kact.sa_restorer = act->sa_restorer;
  37. # endif
  38. }
  39. /* XXX The size argument hopefully will have to be changed to the
  40. real size of the user-level sigset_t. */
  41. result = __syscall_rt_sigaction(sig,
  42. act ? __ptrvalue (&kact) : NULL,
  43. oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
  44. if (oact && result >= 0) {
  45. oact->sa_handler = koact.k_sa_handler;
  46. __memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  47. oact->sa_flags = koact.sa_flags;
  48. # ifdef HAVE_SA_RESTORER
  49. oact->sa_restorer = koact.sa_restorer;
  50. # endif
  51. }
  52. return result;
  53. }
  54. #else
  55. /* If ACT is not NULL, change the action for SIG to *ACT.
  56. If OACT is not NULL, put the old action for SIG in *OACT. */
  57. int
  58. __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  59. {
  60. int result;
  61. struct old_kernel_sigaction kact, koact;
  62. if (act) {
  63. kact.k_sa_handler = act->sa_handler;
  64. kact.sa_mask = act->sa_mask.__val[0];
  65. kact.sa_flags = act->sa_flags;
  66. # ifdef HAVE_SA_RESTORER
  67. kact.sa_restorer = act->sa_restorer;
  68. # endif
  69. }
  70. result = __syscall_sigaction(sig,
  71. act ? __ptrvalue (&kact) : NULL,
  72. oact ? __ptrvalue (&koact) : NULL);
  73. if (oact && result >= 0) {
  74. oact->sa_handler = koact.k_sa_handler;
  75. oact->sa_mask.__val[0] = koact.sa_mask;
  76. oact->sa_flags = koact.sa_flags;
  77. # ifdef HAVE_SA_RESTORER
  78. oact->sa_restorer = koact.sa_restorer;
  79. # endif
  80. }
  81. return result;
  82. }
  83. #endif
  84. #ifndef LIBC_SIGACTION
  85. hidden_weak_alias(__libc_sigaction,__sigaction)
  86. weak_alias(__libc_sigaction,sigaction)
  87. #endif