fs: properly handle fd passed to truncate()

Currently, fs.truncate() silently fails when a file descriptor
is passed as the first argument. This commit changes this
behavior to properly call fs.ftruncate().

PR-URL: https://github.com/joyent/node/pull/9161
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Timothy J Fontaine <tjfontaine@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Conflicts:
	lib/fs.js

1 files changed, 25 insertions, 0 deletions

diff --git a/test/parallel/test-fs-truncate-fd.js b/test/parallel/test-fs-truncate-fd.js
new file mode 100644
index 0000000000..6e9628db86
--- /dev/null
+++ b/test/parallel/test-fs-truncate-fd.js
@@ -0,0 +1,25 @@
+var common = require('../common');
+var assert = require('assert');
+var path = require('path');
+var fs = require('fs');
+var tmp = common.tmpDir;
+if (!fs.existsSync(tmp))
+  fs.mkdirSync(tmp);
+var filename = path.resolve(tmp, 'truncate-file.txt');
+
+var success = 0;
+
+fs.writeFileSync(filename, 'hello world', 'utf8');
+var fd = fs.openSync(filename, 'r+');
+fs.truncate(fd, 5, function(err) {
+  assert.ok(!err);
+  assert.equal(fs.readFileSync(filename, 'utf8'), 'hello');
+  success++;
+});
+
+process.on('exit', function() {
+  fs.closeSync(fd);
+  fs.unlinkSync(filename);
+  assert.equal(success, 1);
+  console.log('ok');
+});