glibc/sysdeps/standalone/brk.c

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/* Copyright (C) 1991, 1994, 1995, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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Ported to standalone by Joel Sherrill jsherril@redstone-emh2.army.mil,
On-Line Applications Research Corporation.
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The GNU C Library is free software; you can redistribute it and/or
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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.
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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
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Lesser General Public License for more details.
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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. */
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#include <stdlib.h>
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void *__curbrk;
void *__rorig;
void *__rlimit;
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int
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__brk (inaddr)
void *inaddr;
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{
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if ( ( (void *)inaddr > (void *)__rlimit ) ||
( (void *)inaddr < (void *)__rorig ) )
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return -1;
__curbrk = inaddr;
return 0;
}
/* Initialization Code for Memory Allocation */
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void *__C_heap_start;
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int __C_heap_size;
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#ifdef HAVE_GNU_LD
static
#endif
void
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__NONE_set_memvals (argc, argv, envp)
int argc;
char **argv;
char **envp;
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{
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__rorig =
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__curbrk = __C_heap_start;
__rlimit = __curbrk + __C_heap_size;
(void) &__NONE_set_memvals; /* Avoid "defined but not used" warning. */
}
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#ifdef HAVE_GNU_LD
text_set_element (__libc_subinit, __NONE_set_memvals);
#endif
weak_alias (__brk, brk)