sigaction.c 3.8 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. Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
  16. */
  17. #include <errno.h>
  18. #include <signal.h>
  19. #include <string.h>
  20. #include <sys/syscall.h>
  21. #include <bits/kernel_sigaction.h>
  22. #define SA_RESTORER 0x04000000
  23. extern void __default_sa_restorer(void);
  24. extern void __default_rt_sa_restorer(void);
  25. extern __typeof(sigaction) __libc_sigaction;
  26. /* When RT signals are in use we need to use a different return stub. */
  27. #ifdef __NR_rt_sigreturn
  28. #define choose_restorer(flags) \
  29. (flags & SA_SIGINFO) ? __default_rt_sa_restorer \
  30. : __default_sa_restorer
  31. #else
  32. #define choose_restorer(flags) \
  33. __default_sa_restorer
  34. #endif
  35. #ifdef __NR_rt_sigaction
  36. libc_hidden_proto(memcpy)
  37. /* If ACT is not NULL, change the action for SIG to *ACT.
  38. If OACT is not NULL, put the old action for SIG in *OACT. */
  39. int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  40. {
  41. int result;
  42. struct kernel_sigaction kact, koact;
  43. if (act) {
  44. kact.k_sa_handler = act->sa_handler;
  45. memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  46. kact.sa_flags = act->sa_flags;
  47. # ifdef HAVE_SA_RESTORER
  48. if (kact.sa_flags & SA_RESTORER) {
  49. kact.sa_restorer = act->sa_restorer;
  50. } else {
  51. kact.sa_restorer = choose_restorer (kact.sa_flags);
  52. kact.sa_flags |= SA_RESTORER;
  53. }
  54. # endif
  55. }
  56. /* XXX The size argument hopefully will have to be changed to the
  57. real size of the user-level sigset_t. */
  58. result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
  59. oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
  60. if (oact && result >= 0) {
  61. oact->sa_handler = koact.k_sa_handler;
  62. memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  63. oact->sa_flags = koact.sa_flags;
  64. # ifdef HAVE_SA_RESTORER
  65. oact->sa_restorer = koact.sa_restorer;
  66. # endif
  67. }
  68. return result;
  69. }
  70. #else
  71. /* If ACT is not NULL, change the action for SIG to *ACT.
  72. If OACT is not NULL, put the old action for SIG in *OACT. */
  73. int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  74. {
  75. int result;
  76. struct old_kernel_sigaction kact, koact;
  77. if (act) {
  78. kact.k_sa_handler = act->sa_handler;
  79. kact.sa_mask = act->sa_mask.__val[0];
  80. kact.sa_flags = act->sa_flags;
  81. # ifdef HAVE_SA_RESTORER
  82. if (kact.sa_flags & SA_RESTORER) {
  83. kact.sa_restorer = act->sa_restorer;
  84. } else {
  85. kact.sa_restorer = choose_restorer (kact.sa_flags);
  86. kact.sa_flags |= SA_RESTORER;
  87. }
  88. # endif
  89. }
  90. result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
  91. oact ? __ptrvalue (&koact) : NULL);
  92. if (oact && result >= 0) {
  93. oact->sa_handler = koact.k_sa_handler;
  94. oact->sa_mask.__val[0] = koact.sa_mask;
  95. oact->sa_flags = koact.sa_flags;
  96. # ifdef HAVE_SA_RESTORER
  97. oact->sa_restorer = koact.sa_restorer;
  98. # endif
  99. }
  100. return result;
  101. }
  102. #endif
  103. #ifndef LIBC_SIGACTION
  104. libc_hidden_proto(sigaction)
  105. weak_alias(__libc_sigaction,sigaction)
  106. libc_hidden_weak(sigaction)
  107. #endif