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893a9cb47c
We don't have an equivalent to mmap in the qemu block API, so read and write the bitmap directly. At least in the dumb implementation added in this patch this is a lot less efficient, but it means cow can also work on windows, and over nbd or curl. And it fixes qemu-iotests testcase 012 which did not work properly due to issues with read-only mmap access. In addition we can also get rid of the now unused get_mmap_addr function. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/*
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* malloc-like functions for system emulation.
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*
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* Copyright (c) 2006 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#include <stdlib.h>
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static void *oom_check(void *ptr)
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{
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if (ptr == NULL) {
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abort();
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}
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return ptr;
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}
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void qemu_free(void *ptr)
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{
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free(ptr);
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}
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static int allow_zero_malloc(void)
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{
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#if defined(CONFIG_ZERO_MALLOC)
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return 1;
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#else
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return 0;
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#endif
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}
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void *qemu_malloc(size_t size)
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{
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if (!size && !allow_zero_malloc()) {
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abort();
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}
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return oom_check(malloc(size ? size : 1));
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}
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void *qemu_realloc(void *ptr, size_t size)
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{
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if (!size && !allow_zero_malloc()) {
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abort();
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}
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return oom_check(realloc(ptr, size ? size : 1));
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}
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void *qemu_mallocz(size_t size)
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{
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if (!size && !allow_zero_malloc()) {
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abort();
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}
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return oom_check(calloc(1, size ? size : 1));
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}
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char *qemu_strdup(const char *str)
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{
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char *ptr;
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size_t len = strlen(str);
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ptr = qemu_malloc(len + 1);
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memcpy(ptr, str, len + 1);
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return ptr;
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}
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char *qemu_strndup(const char *str, size_t size)
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{
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const char *end = memchr(str, 0, size);
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char *new;
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if (end) {
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size = end - str;
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}
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new = qemu_malloc(size + 1);
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new[size] = 0;
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return memcpy(new, str, size);
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}
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