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aad0bd6bc7
A non-readable mapping of a file causes an access violation in the pack tests. Always use PROT_READ to work around this.
69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
/*
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* Copyright (C) the libgit2 contributors. All rights reserved.
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*
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* This file is part of libgit2, distributed under the GNU GPL v2 with
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* a Linking Exception. For full terms see the included COPYING file.
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*/
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#include <git2/common.h>
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#if !defined(GIT_WIN32) && !defined(NO_MMAP)
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#include "map.h"
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#include <sys/mman.h>
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#include <unistd.h>
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#include <errno.h>
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int git__page_size(size_t *page_size)
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{
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long sc_page_size = sysconf(_SC_PAGE_SIZE);
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if (sc_page_size < 0) {
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giterr_set_str(GITERR_OS, "Can't determine system page size");
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return -1;
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}
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*page_size = (size_t) sc_page_size;
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return 0;
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}
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int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
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{
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int mprot = PROT_READ;
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int mflag = 0;
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GIT_MMAP_VALIDATE(out, len, prot, flags);
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out->data = NULL;
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out->len = 0;
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if (prot & GIT_PROT_WRITE)
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mprot |= PROT_WRITE;
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if ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)
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mflag = MAP_SHARED;
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else if ((flags & GIT_MAP_TYPE) == GIT_MAP_PRIVATE)
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mflag = MAP_PRIVATE;
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else
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mflag = MAP_SHARED;
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out->data = mmap(NULL, len, mprot, mflag, fd, offset);
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if (!out->data || out->data == MAP_FAILED) {
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giterr_set(GITERR_OS, "Failed to mmap. Could not write data");
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return -1;
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}
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out->len = len;
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return 0;
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}
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int p_munmap(git_map *map)
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{
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assert(map != NULL);
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munmap(map->data, map->len);
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return 0;
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}
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#endif
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