brk.c 1.3 KB

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  1. /* brk system call for Linux/MIPS.
  2. Copyright (C) 2000 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  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 <errno.h>
  17. #include <unistd.h>
  18. #include <sys/syscall.h>
  19. void *___brk_addr = 0;
  20. int brk (void *addr)
  21. {
  22. void *newbrk;
  23. {
  24. register long int res __asm__ ("$2");
  25. asm ("move\t$4,%2\n\t"
  26. "syscall" /* Perform the system call. */
  27. : "=r" (res)
  28. : "0" (__NR_brk), "r" (addr)
  29. : "$4", "$7");
  30. newbrk = (void *) res;
  31. }
  32. ___brk_addr = newbrk;
  33. if (newbrk < addr)
  34. {
  35. __set_errno (ENOMEM);
  36. return -1;
  37. }
  38. return 0;
  39. }