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vfork.S

vfork.S 856 B
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  1. /* vi: set sw=4 ts=4: */
    2. 

  2. /* vfork for uClibc
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2000 by Lineo, inc. and Erik Andersen
    5. 

  5.  * Copyright (C) 2000,2001 by Erik Andersen <andersen@uclibc.org>
    6. 

  6.  * Written by Erik Andersen <andersen@uclibc.org>
    7. 

  7.  *
    8. 

  8.  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
    9. 

  9.  */
    10. 

  10. 

  11. #include <features.h>
    12. 

  12. 

  13. #define _ERRNO_H
    14. 

  14. #include <bits/errno.h>
    15. 

  15. #include <sys/syscall.h>
    16. 

  16. 

  17. #ifdef __NR_fork
    18. 

  18. .text
    19. 

  19. .global	vfork
    20. 

  20. .type	vfork,%function
    21. 

  21. .align 4
    22. 

  22. 

  23. vfork:
    24. 

  24. 

  25. #ifdef __NR_vfork
    26. 

  26. 	swi	__NR_vfork
    27. 

  27. 	cmn	r0, #4096
    28. 

  28. 	movcc	pc, lr
    29. 

  29. 

  30. 	/* Check if vfork even exists.  */
    31. 

  31. 	ldr     r1, =-ENOSYS
    32. 

  32. 	teq     r0, r1
    33. 

  33. 	bne     __error
    34. 

  34. #endif
    35. 

  35. 

  36. 	/* If we don't have vfork, use fork.  */
    37. 

  37. 	swi     __NR_fork
    38. 

  38. 	cmn     r0, #4096
    39. 

  39. 

  40. 	/* Syscall worked.  Return to child/parent */
    41. 

  41. 	movcc   pc, lr
    42. 

  42. 

  43. __error:
    44. 

  44. 	b	__syscall_error
    45. 

  45. 

  46. .size vfork,.-vfork
    47. 

  47. libc_hidden_def(vfork)
    48. 

  48. #endif
    49.