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Seek back to current filepos when mmap()ing with NO_MMAP
"git-index-pack --fix-thin" relies on mmap() not changing the current file position (otherwise the pack will be corrupted when writing the final SHA1). Meet that expectation. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
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@ -7,6 +7,7 @@
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void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
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{
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int n = 0;
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off_t current_offset = lseek(fd, 0, SEEK_CUR);
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if (start != NULL || !(flags & MAP_PRIVATE))
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die("Invalid usage of gitfakemmap.");
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@ -39,6 +40,11 @@ void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_
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n += count;
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}
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if (current_offset != lseek(fd, current_offset, SEEK_SET)) {
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errno = EINVAL;
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return MAP_FAILED;
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}
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return start;
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}
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