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r9749@danube: weasel | 2006-09-14 06:53:12 +0200

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Do not graciously increase the size to be mmaped if the current size already is
 at a page_size boundary.  This is important since if a file has a size of zero
 and we mmap() it with length > 0, then accessing the mmaped memory area causes
 a bus error.  However, if we pass a length of 0 to mmap() it will return with -1
 and things work from there.


svn:r8387
This commit is contained in:
Peter Palfrader 2006-09-14 04:53:42 +00:00
parent 984e8f6efb
commit 28cac25d7e
1 changed files with 1 additions and 1 deletions
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2
src/common/compat.c
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@ -130,7 +130,7 @@ tor_mmap_file(const char *filename)
lseek(fd, 0, SEEK_SET);
/* ensure page alignment */
page_size = getpagesize();
size += (page_size + (page_size-(size%page_size)));
size += (size%page_size) ? page_size-(size%page_size) : 0;
string = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
if (string == MAP_FAILED) {