sigaction.c 4.5 KB

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  1. /* Copyright (C) 1997, 1998, 1999, 2000 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 Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. 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. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If not,
  13. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14. Boston, MA 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 __typeof(sigaction) __libc_sigaction;
  24. #ifdef __NR_rt_sigaction
  25. /* Experimentally off - libc_hidden_proto(memcpy) */
  26. #if _MIPS_SIM != _ABIO32
  27. # ifdef __NR_rt_sigreturn
  28. static void restore_rt (void) __asm__ ("__restore_rt");
  29. # endif
  30. # ifdef __NR_sigreturn
  31. static void restore (void) __asm__ ("__restore");
  32. # endif
  33. #endif
  34. /* If ACT is not NULL, change the action for SIG to *ACT.
  35. If OACT is not NULL, put the old action for SIG in *OACT. */
  36. int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  37. {
  38. int result;
  39. struct kernel_sigaction kact, koact;
  40. if (act) {
  41. kact.k_sa_handler = act->sa_handler;
  42. memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask));
  43. kact.sa_flags = act->sa_flags;
  44. # ifdef HAVE_SA_RESTORER
  45. # if _MIPS_SIM == _ABIO32
  46. kact.sa_restorer = act->sa_restorer;
  47. # else
  48. kact.sa_restorer = &restore_rt;
  49. # endif
  50. # endif
  51. }
  52. /* XXX The size argument hopefully will have to be changed to the
  53. real size of the user-level sigset_t. */
  54. result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
  55. oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
  56. if (oact && result >= 0) {
  57. oact->sa_handler = koact.k_sa_handler;
  58. memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (oact->sa_mask));
  59. oact->sa_flags = koact.sa_flags;
  60. # ifdef HAVE_SA_RESTORER
  61. oact->sa_restorer = koact.sa_restorer;
  62. # endif
  63. }
  64. return result;
  65. }
  66. #else
  67. extern void restore (void) __asm__ ("__restore") attribute_hidden;
  68. /* If ACT is not NULL, change the action for SIG to *ACT.
  69. If OACT is not NULL, put the old action for SIG in *OACT. */
  70. int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  71. {
  72. int result;
  73. struct old_kernel_sigaction kact, koact;
  74. if (act) {
  75. kact.k_sa_handler = act->sa_handler;
  76. kact.sa_mask = act->sa_mask.__val[0];
  77. kact.sa_flags = act->sa_flags;
  78. # ifdef HAVE_SA_RESTORER
  79. # if _MIPS_SIM == _ABIO32
  80. kact.sa_restorer = act->sa_restorer;
  81. # else
  82. kact.sa_restorer = &restore_rt;
  83. # endif
  84. # endif
  85. }
  86. result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
  87. oact ? __ptrvalue (&koact) : NULL);
  88. if (result < 0) {
  89. __set_errno(-result);
  90. return -1;
  91. }
  92. if (oact) {
  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
  108. /* NOTE: Please think twice before making any changes to the bits of
  109. code below. GDB needs some intimate knowledge about it to
  110. recognize them as signal trampolines, and make backtraces through
  111. signal handlers work right. Important are both the names
  112. (__restore_rt) and the exact instruction sequence.
  113. If you ever feel the need to make any changes, please notify the
  114. appropriate GDB maintainer. */
  115. #define RESTORE(name, syscall) RESTORE2 (name, syscall)
  116. #define RESTORE2(name, syscall) \
  117. asm \
  118. ( \
  119. ".align 4\n" \
  120. "__" #name ":\n" \
  121. " li $2, " #syscall "\n" \
  122. " syscall\n" \
  123. );
  124. /* The return code for realtime-signals. */
  125. #if _MIPS_SIM != _ABIO32
  126. # ifdef __NR_rt_sigreturn
  127. RESTORE (restore_rt, __NR_rt_sigreturn)
  128. # endif
  129. # ifdef __NR_sigreturn
  130. RESTORE (restore, __NR_sigreturn)
  131. # endif
  132. #endif