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a8874eadae
Mon Aug 12 04:33:09 1996 Ulrich Drepper <drepper@cygnus.com> * nss/nsswitch.c (__nss_database_lookup): Always release locks before returning. Reported by Miles Bader. (distributes): Add databases.def.
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Copyright (C) 1991, 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the GNU C Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <unistd.h>
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#include <errno.h>
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/* Defined in brk.c. */
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extern void *__curbrk;
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extern int __brk (void *addr);
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#ifdef PIC
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extern int __libc_is_static;
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weak_extern (__libc_is_static)
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#endif
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/* Extend the process's data space by INCREMENT.
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If INCREMENT is negative, shrink data space by - INCREMENT.
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Return start of new space allocated, or -1 for errors. */
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void *
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__sbrk (ptrdiff_t increment)
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{
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void *oldbrk;
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/* If this is not part of the dynamic library or the library is used
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via dynamic loading in a statically linked program update
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__curbrk from the kernel's brk value. That way two separate
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instances of __brk and __sbrk can share the heap, returning
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interleaved pieces of it. */
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#ifdef PIC
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if (__curbrk == NULL || &__libc_is_static == NULL)
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#endif
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if (__brk (0) < 0)
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return (void *) -1;
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if (increment == 0)
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return __curbrk;
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oldbrk = __curbrk;
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if (__brk (oldbrk + increment) < 0)
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return (void *) -1;
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return oldbrk;
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}
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weak_alias (__sbrk, sbrk)
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