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vfork.S

vfork.S 1.4 KB
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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.  * This program is free software; you can redistribute it and/or modify it
    9. 

  9.  * under the terms of the GNU Library General Public License as published by
    10. 

  10.  * the Free Software Foundation; either version 2 of the License, or (at your
    11. 

  11.  * option) any later version.
    12. 

  12.  *
    13. 

  13.  * This program is distributed in the hope that it will be useful, but WITHOUT
    14. 

  14.  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    15. 

  15.  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
    16. 

  16.  * for more details.
    17. 

  17.  *
    18. 

  18.  * You should have received a copy of the GNU Library General Public License
    19. 

  19.  * along with this program; if not, write to the Free Software Foundation,
    20. 

  20.  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    21. 

  21.  */
    22. 

  22. 

  23. #define _ERRNO_H
    24. 

  24. #include <bits/errno.h>
    25. 

  25. #include <sys/syscall.h>
    26. 

  26. 

  27. #ifdef __NR_fork
    28. 

  28. .text
    29. 

  29. .global vfork
    30. 

  30. .type vfork,%function
    31. 

  31. .align 4
    32. 

  32. vfork:
    33. 

  33. 

  34. #ifdef __NR_vfork
    35. 

  35. 	swi	__NR_vfork
    36. 

  36. 	cmn	r0, #4096
    37. 

  37. 	movcc	pc, lr
    38. 

  38. 

  39. 	/* Check if vfork even exists.  */
    40. 

  40. 	ldr     r1, =-ENOSYS
    41. 

  41. 	teq     r0, r1
    42. 

  42. 	bne     __error
    43. 

  43. #endif
    44. 

  44. 

  45. 	/* If we don't have vfork, use fork.  */
    46. 

  46. 	swi     __NR_fork
    47. 

  47. 	cmn     r0, #4096
    48. 

  48. 

  49. 	/* Syscal worked.  Return to child/parent */
    50. 

  50. 	movcc   pc, lr
    51. 

  51. 

  52. __error:
    53. 

  53. 	b	__syscall_error
    54. 

  54. 

  55. .size vfork,.-vfork
    56. 

  56. #endif
    57.