mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-06 05:10:05 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Copyright (C) 1991, 1995, 1996, 1997, 2000 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
/* Defined in brk.c. */
|
|
extern void *__curbrk;
|
|
extern int __brk (void *addr);
|
|
|
|
extern int __libc_multiple_libcs; /* Defined in init-first.c. */
|
|
|
|
/* 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. */
|
|
void *
|
|
__sbrk (intptr_t increment)
|
|
{
|
|
void *oldbrk;
|
|
|
|
/* If this is not part of the dynamic library or the library is used
|
|
via dynamic loading in a statically linked program update
|
|
__curbrk from the kernel's brk value. That way two separate
|
|
instances of __brk and __sbrk can share the heap, returning
|
|
interleaved pieces of it. */
|
|
if (__curbrk == NULL || __libc_multiple_libcs)
|
|
if (__brk (0) < 0) /* Initialize the break. */
|
|
return (void *) -1;
|
|
|
|
if (increment == 0)
|
|
return __curbrk;
|
|
|
|
oldbrk = __curbrk;
|
|
if (__brk (oldbrk + increment) < 0)
|
|
return (void *) -1;
|
|
|
|
return oldbrk;
|
|
}
|
|
|
|
weak_alias (__sbrk, sbrk)
|