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55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* brk system call for Linux/SPARC.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx)
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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
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License as published by the Free Software Foundation; either
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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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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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
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <sysdep.h>
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/* This must be initialized data because commons can't have aliases. */
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void *__curbrk = 0;
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/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
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to work around different old braindamage in the old Linux ELF dynamic
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linker. */
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weak_alias (__curbrk, ___brk_addr)
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int
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__brk (void *addr)
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{
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void *newbrk;
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{
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register void *o0 __asm__("%o0") = addr;
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register int g1 __asm__("%g1") = __NR_brk;
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__asm ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc");
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newbrk = o0;
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}
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__curbrk = newbrk;
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if (newbrk < addr)
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{
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__set_errno (ENOMEM);
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return -1;
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}
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return 0;
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}
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weak_alias (__brk, brk)
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