vfork.S 1.8 KB

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  1. /* Copyright (C) 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the 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. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <sysdep-cancel.h>
  17. #define _ERRNO_H 1
  18. #include <bits/errno.h>
  19. /* Clone the calling process, but without copying the whole address space.
  20. The calling process is suspended until the new process exits or is
  21. replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
  22. and the process ID of the new process to the old process. */
  23. ENTRY (__vfork)
  24. basr %r1,0
  25. 0:
  26. #ifdef SHARED
  27. al %r1,4f-0b(%r1)
  28. l %r1,0(%r1)
  29. ltr %r1,%r1
  30. #else
  31. icm %r1,15,4f-0b(%r1)
  32. #endif
  33. jne 1f
  34. /* Do vfork system call. */
  35. svc SYS_ify (vfork)
  36. /* Check for error. */
  37. lhi %r4,-4095
  38. clr %r2,%r4
  39. jnl SYSCALL_ERROR_LABEL
  40. /* Normal return. */
  41. br %r14
  42. 1:
  43. basr %r1,0
  44. 2:
  45. al %r1,3f-2b(%r1)
  46. br %r1
  47. 3:
  48. .long HIDDEN_JUMPTARGET(__fork)-2b
  49. 4:
  50. #ifdef SHARED
  51. .long __libc_pthread_functions-0b
  52. #else
  53. .weak pthread_create
  54. .long pthread_create
  55. #endif
  56. PSEUDO_END(__vfork)
  57. libc_hidden_def (__vfork)
  58. weak_alias (__vfork, vfork)