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412a6b2e08
This adds wrappers around recv(), send(), and php_pollfd_for_ms() to
handle EINTR.
This is a bit hard to test on its own, but it is testable manually using
the following script:
```php
pcntl_signal(SIGUSR1, function() {
var_dump(func_get_args());
}, false);
var_dump(getmypid());
sleep(10);
$ftp = ftp_connect('127.0.0.1');
ftp_login($ftp, 'user', 'pass');
ftp_put($ftp, 'testfile', 'testfile');
```
in combination with an infinite while loop that sends SIGUSR1 to the
process.
Closes GH-17327.