sigaction.c 2.7 KB

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  1. /* POSIX.1 sigaction call for Linux/SPARC.
  2. Copyright (C) 1997-2000,2002,2003,2005 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997.
  5. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Lesser General Public
  7. License as published by the Free Software Foundation; either
  8. version 2.1 of the License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; if not, write to the Free
  15. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  16. 02111-1307 USA.
  17. Ported to uClibc from glibc: 090520:
  18. Jan Buchholz, KIP, Uni Heidelberg <jan.buchholz@kip.uni-heidelberg.de>
  19. Austin Foxley, Ceton Corporation <austinf@cetoncorp.com>
  20. */
  21. #include <errno.h>
  22. #include <signal.h>
  23. #include <string.h>
  24. #include <sys/syscall.h>
  25. #include <bits/kernel_sigaction.h>
  26. _syscall5(int, rt_sigaction, int, a, int, b, int, c, int, d, int, e);
  27. static void __rt_sigreturn_stub(void);
  28. static void __sigreturn_stub(void);
  29. int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
  30. {
  31. int ret;
  32. struct sigaction kact, koact;
  33. unsigned long stub = 0;
  34. if (act) {
  35. kact.sa_handler = act->sa_handler;
  36. memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  37. if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO) != 0)
  38. stub = (unsigned long) &__rt_sigreturn_stub;
  39. else
  40. stub = (unsigned long) &__sigreturn_stub;
  41. stub -= 8;
  42. kact.sa_restorer = NULL;
  43. }
  44. /* XXX The size argument hopefully will have to be changed to the
  45. * real size of the user-level sigset_t. */
  46. ret = INLINE_SYSCALL (rt_sigaction, 5, sig, act ? &kact : 0,
  47. oact ? &koact : 0, stub, _NSIG / 8);
  48. if (oact && ret >= 0) {
  49. oact->sa_handler = koact.sa_handler;
  50. memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  51. oact->sa_flags = koact.sa_flags;
  52. oact->sa_restorer = koact.sa_restorer;
  53. }
  54. return ret;
  55. }
  56. #ifndef LIBC_SIGACTION
  57. weak_alias(__libc_sigaction,sigaction)
  58. libc_hidden_weak(sigaction)
  59. #endif
  60. static void
  61. __rt_sigreturn_stub(void)
  62. {
  63. __asm__(
  64. "mov %0, %%g1\n\t"
  65. "ta 0x10\n\t"
  66. : /* no outputs */
  67. : "i" (__NR_rt_sigreturn)
  68. );
  69. }
  70. static void
  71. __sigreturn_stub(void)
  72. {
  73. __asm__(
  74. "mov %0, %%g1\n\t"
  75. "ta 0x10\n\t"
  76. : /* no outputs */
  77. : "i" (__NR_sigreturn)
  78. );
  79. }