diff options
Diffstat (limited to 'sysdeps/generic/sbrk.c')
-rw-r--r-- | sysdeps/generic/sbrk.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/generic/sbrk.c b/sysdeps/generic/sbrk.c new file mode 100644 index 0000000..28beab6 --- /dev/null +++ b/sysdeps/generic/sbrk.c @@ -0,0 +1,42 @@ +/* Copyright (C) 1991, 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with the GNU C Library; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> + +/* Defined in brk.c. */ +extern PTR __curbrk; +extern int EXFUN(__brk, (PTR addr)); + +/* Extend the process's data space by INCREMENT. + If INCREMENT is negative, shrink data space by - INCREMENT. + Return start of new space allocated, or -1 for errors. */ +PTR +DEFUN(__sbrk, (increment), int increment) +{ + char *oldbrk; + + if (increment == 0) + return __curbrk; + + oldbrk = __curbrk; + if (__brk(oldbrk + increment) < 0) + return (PTR) -1; + + return oldbrk; +} + +weak_alias (__sbrk, sbrk) |