brk.c 1.5 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253
  1. /* brk system call for Linux/i386.
  2. Copyright (C) 1995, 1996, 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. libc_hidden_proto(brk)
  20. /* This must be initialized data because commons can't have aliases. */
  21. extern void *__curbrk;
  22. libc_hidden_proto(__curbrk)
  23. void *__curbrk = 0;
  24. libc_hidden_data_def(__curbrk)
  25. int brk (void *addr)
  26. {
  27. void *newbrk;
  28. {
  29. register void *o0 __asm__("%o0") = addr;
  30. register int g1 __asm__("%g1") = 17 ;
  31. __asm ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc");
  32. newbrk = o0;
  33. }
  34. __curbrk = newbrk;
  35. if (newbrk < addr)
  36. {
  37. __set_errno (ENOMEM);
  38. return -1;
  39. }
  40. return 0;
  41. }
  42. libc_hidden_def(brk)