free_fd() lists /proc/self/fd to find the smallest unused file
descriptor
sanity test_31n is changed to use free_fd() instead of using hardcoded
173
sanity test_236 is changed to use free_fd() instead of using "{FD}<>"
which is not available on eariler bash
Signed-off-by: Vladimir Saveliev <vladimir_saveliev@xyratex.com>
Change-Id: Ie13da99e4a758d7169454c7a6b3b58c594b30ecc
Reviewed-on: http://review.whamcloud.com/8181
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
touch $DIR/$tfile || error "cannot create '$DIR/$tfile'"
nlink=$(stat --format=%h $DIR/$tfile)
[ ${nlink:--1} -eq 1 ] || error "nlink is $nlink, expected 1"
touch $DIR/$tfile || error "cannot create '$DIR/$tfile'"
nlink=$(stat --format=%h $DIR/$tfile)
[ ${nlink:--1} -eq 1 ] || error "nlink is $nlink, expected 1"
- exec 173<$DIR/$tfile
- trap "exec 173<&-" EXIT
- nlink=$(stat --dereference --format=%h /proc/self/fd/173)
+ local fd=$(free_fd)
+ local cmd="exec $fd<$DIR/$tfile"
+ eval $cmd
+ cmd="exec $fd<&-"
+ trap "eval $cmd" EXIT
+ nlink=$(stat --dereference --format=%h /proc/self/fd/$fd)
[ ${nlink:--1} -eq 1 ] || error "nlink is $nlink, expected 1"
rm $DIR/$tfile || error "cannot remove '$DIR/$tfile'"
[ ${nlink:--1} -eq 1 ] || error "nlink is $nlink, expected 1"
rm $DIR/$tfile || error "cannot remove '$DIR/$tfile'"
- nlink=$(stat --dereference --format=%h /proc/self/fd/173)
+ nlink=$(stat --dereference --format=%h /proc/self/fd/$fd)
[ ${nlink:--1} -eq 0 ] || error "nlink is $nlink, expected 0"
[ ${nlink:--1} -eq 0 ] || error "nlink is $nlink, expected 0"
}
run_test 31n "check link count of unlinked file"
}
run_test 31n "check link count of unlinked file"
cp $ref1 $file1 || error "cp $ref1 $file1 failed: rc = $?"
$SETSTRIPE -c 2 $file2 || error "cannot setstripe on '$file2': rc = $?"
cp $ref2 $file2 || error "cp $ref2 $file2 failed: rc = $?"
cp $ref1 $file1 || error "cp $ref1 $file1 failed: rc = $?"
$SETSTRIPE -c 2 $file2 || error "cannot setstripe on '$file2': rc = $?"
cp $ref2 $file2 || error "cp $ref2 $file2 failed: rc = $?"
+ local fd=$(free_fd)
+ local cmd="exec $fd<>$file2"
+ eval $cmd
- $LFS swap_layouts $file1 /proc/self/fd/${FD} ||
- error "cannot swap layouts of '$file1' and /proc/self/fd/${FD}"
- exec {FD}>&-
+ $LFS swap_layouts $file1 /proc/self/fd/${fd} ||
+ error "cannot swap layouts of '$file1' and /proc/self/fd/${fd}"
+ cmd="exec $fd>&-"
+ eval $cmd
cmp $ref2 $file1 || error "content compare failed ($ref2 != $file1)"
#cleanup
cmp $ref2 $file1 || error "content compare failed ($ref2 != $file1)"
#cleanup
+
+# find the smallest and not in use file descriptor
+free_fd()
+{
+ local max_fd=$(ulimit -n)
+ local fd=3
+ while [[ $fd -le $max_fd && -e /proc/self/fd/$fd ]]; do
+ ((++fd))
+ done
+ [ $fd -lt $max_fd ] || error "finding free file descriptor failed"
+ echo $fd
+}