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Seek back to current filepos when mmap()ing with NO_MMAP

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"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>
This commit is contained in:
Johannes Schindelin
2006-11-15 17:27:54 +01:00
committed by Junio C Hamano
parent e267c2f6f0
commit 0a3881d4cf
1 changed files with 6 additions and 0 deletions
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6
compat/mmap.c
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@ -7,6 +7,7 @@
void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset) void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
{ {
int n = 0; int n = 0;
off_t current_offset = lseek(fd, 0, SEEK_CUR);
if (start != NULL || !(flags & MAP_PRIVATE)) if (start != NULL || !(flags & MAP_PRIVATE))
die("Invalid usage of gitfakemmap."); die("Invalid usage of gitfakemmap.");
@ -39,6 +40,11 @@ void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_
n += count; n += count;
} }
if (current_offset != lseek(fd, current_offset, SEEK_SET)) {
errno = EINVAL;
return MAP_FAILED;
}
return start; return start;
} }