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MFC r196558: Don't try to mmap the contents of empty files. This behaviour

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was harmless prior to r195693, when mmap(2) changed from silently ignoring
requests for mapping zero bytes to returning EINVAL; this commit can be seen
as adjusting for the change in mmap(2) in order to make look(1) act like it
did previously.

Reviewed by:	jhb
Approved by:	re (kib)
This commit is contained in:
Colin Percival 2009-08-31 13:02:21 +00:00
parent de3a9cf126
commit ee1db5ae45
1 changed files with 4 additions and 0 deletions
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4
usr.bin/look/look.c
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@ -140,6 +140,10 @@ main(int argc, char *argv[])
err(2, "%s", file);
if (sb.st_size > SIZE_T_MAX)
errx(2, "%s: %s", file, strerror(EFBIG));
if (sb.st_size == 0) {
close(fd);
continue;
}
if ((front = mmap(NULL, (size_t)sb.st_size, PROT_READ, MAP_SHARED, fd, (off_t)0)) == MAP_FAILED)
err(2, "%s", file);
back = front + sb.st_size;