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https://github.com/freebsd/freebsd-src
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8269e7673c
Remove core system call implementations and documentation to lib/libsys and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>. Update paths to allow libc to find them in their new home. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2018 Mark Johnston <markj@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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void *__sys_break(char *nsize);
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static uintptr_t curbrk, minbrk;
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static int curbrk_initted;
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static int
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initbrk(void)
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{
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void *newbrk;
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if (!curbrk_initted) {
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newbrk = __sys_break(NULL);
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if (newbrk == (void *)-1)
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return (-1);
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curbrk = minbrk = (uintptr_t)newbrk;
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curbrk_initted = 1;
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}
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return (0);
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}
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static void *
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mvbrk(void *addr)
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{
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uintptr_t oldbrk;
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if ((uintptr_t)addr < minbrk) {
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/* Emulate legacy error handling in the syscall. */
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errno = EINVAL;
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return ((void *)-1);
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}
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if (__sys_break(addr) == (void *)-1)
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return ((void *)-1);
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oldbrk = curbrk;
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curbrk = (uintptr_t)addr;
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return ((void *)oldbrk);
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}
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int
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brk(const void *addr)
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{
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if (initbrk() == -1)
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return (-1);
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if ((uintptr_t)addr < minbrk)
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addr = (void *)minbrk;
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return (mvbrk(__DECONST(void *, addr)) == (void *)-1 ? -1 : 0);
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}
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int
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_brk(const void *addr)
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{
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if (initbrk() == -1)
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return (-1);
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return (mvbrk(__DECONST(void *, addr)) == (void *)-1 ? -1 : 0);
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}
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void *
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sbrk(intptr_t incr)
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{
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if (initbrk() == -1)
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return ((void *)-1);
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if ((incr > 0 && curbrk + incr < curbrk) ||
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(incr < 0 && curbrk + incr > curbrk)) {
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/* Emulate legacy error handling in the syscall. */
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errno = EINVAL;
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return ((void *)-1);
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}
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return (mvbrk((void *)(curbrk + incr)));
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}
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