Current File : /home/vacivi36/vittasync.vacivitta.com.br/vittasync/node/test/parallel/test-fs-writefile-with-fd.js
'use strict';
// This test makes sure that `writeFile()` always writes from the current
// position of the file, instead of truncating the file, when used with file
// descriptors.
const common = require('../common');
const assert = require('assert');
const fs = require('fs');
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
{
/* writeFileSync() test. */
const filename = tmpdir.resolve('test.txt');
/* Open the file descriptor. */
const fd = fs.openSync(filename, 'w');
try {
/* Write only five characters, so that the position moves to five. */
assert.strictEqual(fs.writeSync(fd, 'Hello'), 5);
assert.strictEqual(fs.readFileSync(filename).toString(), 'Hello');
/* Write some more with writeFileSync(). */
fs.writeFileSync(fd, 'World');
/* New content should be written at position five, instead of zero. */
assert.strictEqual(fs.readFileSync(filename).toString(), 'HelloWorld');
} finally {
fs.closeSync(fd);
}
}
const fdsToCloseOnExit = [];
process.on('beforeExit', common.mustCall(() => {
for (const fd of fdsToCloseOnExit) {
try {
fs.closeSync(fd);
} catch {
// Failed to close, ignore
}
}
}));
{
/* writeFile() test. */
const file = tmpdir.resolve('test1.txt');
/* Open the file descriptor. */
fs.open(file, 'w', common.mustSucceed((fd) => {
fdsToCloseOnExit.push(fd);
/* Write only five characters, so that the position moves to five. */
fs.write(fd, 'Hello', common.mustSucceed((bytes) => {
assert.strictEqual(bytes, 5);
assert.strictEqual(fs.readFileSync(file).toString(), 'Hello');
/* Write some more with writeFile(). */
fs.writeFile(fd, 'World', common.mustSucceed(() => {
/* New content should be written at position five, instead of zero. */
assert.strictEqual(fs.readFileSync(file).toString(), 'HelloWorld');
}));
}));
}));
}
// Test read-only file descriptor
{
const file = tmpdir.resolve('test.txt');
fs.open(file, 'r', common.mustSucceed((fd) => {
fdsToCloseOnExit.push(fd);
fs.writeFile(fd, 'World', common.expectsError(/EBADF/));
}));
}
// Test with an AbortSignal
{
const controller = new AbortController();
const signal = controller.signal;
const file = tmpdir.resolve('test.txt');
fs.open(file, 'w', common.mustSucceed((fd) => {
fdsToCloseOnExit.push(fd);
fs.writeFile(fd, 'World', { signal }, common.expectsError({
name: 'AbortError'
}));
}));
controller.abort();
}
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