I'm trying to get
`mysql -uroot`;
to enter the MySQL interactive client just as executing
$ mysql -uroot
from the shell does.
It's okay if the PHP script exists after (or before), but I need it to invoke the MySQL client.
I've tried using proc_open() and of course system(), exec() and passthru(). Wondering if anyone has any tips.
New solution:
<?php
$descriptorspec = array(
0 => STDIN,
1 => STDOUT,
2 => STDERR
);
$process = proc_open('mysql -uroot', $descriptorspec, $pipes);
Old one:
Save for tab completion (you could probably get it in there if you read out bytes with fread instead of using fgets), this gets you on your way, lots left to tweak:
<?php
$descriptorspec = array(
0 => array("pty"),
1 => array("pty"),
2 => array("pty")
);
$process = proc_open('mysql -uroot', $descriptorspec, $pipes);
stream_set_blocking($pipes[1], 0);
stream_set_blocking($pipes[2], 0);
stream_set_blocking(STDIN,0);
do {
echo stream_get_contents($pipes[1]);
echo stream_get_contents($pipes[2]);
while($in = fgets(STDIN)) fwrite($pipes[0],$in);
} while (1);
I guess it does work, but it's waiting for some input. Try sending some sql commands to it's stdin. Of course, since the backtick operator doesn't support IO remapping, you'll need more complex process handling.
Related
I use the following code to open a process with proc_open, and to save the handle and the pipes to a file:
$command = "COMMAND_TO_EXECUTE";
$descriptors = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("file", "error-output.txt", "a") // stderr is a file to write to
);
$pipes = array();
$processHandle = proc_open($command, $descriptors, $pipes);
if (is_resource($processHandle)) {
$processToSave = array(
"process" => $processHandle,
"pipes" => $pipes
);
file_put_contents("myfile.bin", serialize($processToSave) );
}
And in a second moment i need to retrieve this file handle from the file, i've used this code:
$processArray = unserialize(file_get_contents("myfile.bin"));
$processHandle = $processArray["process"];
$pipes = $processArray["pipes"];
But when I print a var_dump of $processHandle and $pipes after retrieving from file, I'll get integers instead of resource or process, but why??
var_dump($processHandle) -> int(0)
var_dump($pipes) - > array(2) { int(0), int(0) }
And at this point of course, if I try to close the pipes, i will get an error, resource expected, integer given.
How can I make this working? (NOTE: This is the solution I'm looking for)
But alternatively, I can get also the pid of process and then use this pid to stop or kill or do anything else with the process, but what about the pipes?
How can I read/write or save error from/to the process?
Thank you
Found the solution to myself, it's not to possible to serialize resource and when the script has done, those resource handler were free.
Solution was to create a daemon listening on a port, wich on request launch and stop process. Because the process is always running, it can maintain a list of handler process and stop when requested.
I am trying to move a file from one folder to another at a specific time. In order to achieve this I am trying to use the Linux at command with a pipe :
`mv file /to/dest | at h:m d.m.y`
This is what I've written:
$move = "mv $filename /destination/folder";
$at = "at $my_datetime";
$res = execute_pipe($move,$at);
where the execute_pipe function is defined as following:
function execute_pipe($cmd1 , $cmd2)
{
$proc_cmd1 = proc_open($cmd1,
array(
array("pipe","r"), //stdin
array("pipe","w"), //stdout
array("pipe","w") //stderr
),
$pipes);
$output_cmd1 = stream_get_contents($pipes[1]);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
$return_value_cmd1 = proc_close($proc_cmd1);
$proc_cmd2 = proc_open($cmd2,
array(
array("pipe","r"), //stdin
array("pipe","w"), //stdout
array("pipe","w") //stderr
),
$pipes);
fwrite($pipes[0], $output_cmd1);
fclose($pipes[0]);
$output_cmd2 = stream_get_contents($pipes[1]);
fclose($pipes[1]);
fclose($pipes[2]);
$return_value_cmd2 = proc_close($proc_cmd2);
return $output_cmd2;
}
The problem is that the files get moved right away, ignoring the at command. What am I missing? Is there a better way to do this?
To me it seems like your problem has nothing to do with PHP. You're just using the Shell incorrectly.
The Man page of at reads:
at and batch read commands from standard input or a specified file
which are to be executed at a later time, using /bin/sh.
But your usage of the shell does execute your "mv file /destination" command, and then pipes the OUTPUT of that command to at. On a successful moving operation that output will ne nothing. So by using the pipe you actually move the file right away and tell at to do nothing at your specified time.
Read the man page of at by typing man at into your terminal to resolve the issue. Hint: if you want to use STD INPUT, echo'ing your command might help ;)
I'm using proc_open with pdftk to pre-fill some forms with data, this works pretty well, but rather than save the result to a file and then read the file back, I'd like to print the file directly out. I've got this working so I'm not having any problems. But I'd like to direct the output of proc_open directly to the stream returned to the user so that I don't have to hold the value in memory in php. So far I have the following:
$descriptorspec = array(
0 => array("pipe","r"),
1 => array("pipe","w"),
2 => array("file","error.txt","a") );
$process = proc_open($command, $descriptorspec, $pipes);
if( is_resource( $process ) ) {
fwrite($pipes[0], $fdf);
fclose($pipes[0]);
echo stream_get_contents($pipes[1]));
fclose($pipes[1]);
proc_close($process);
}
I'd like to direct the result directly out to the use as you would get in the above code, without actually saving the value in a variable and then printing it out. Is there a way to direct a stream in php's output directly to the output. I'd like to do this to save memory and reduce the time it takes for the code to run.
Does anyone know of a function for a stream in php that prints the stream result directly out. Or is there a setting for proc_open that does this. Either way I fear this may not work at all, as I may need to add a content-length header to the output to display the PDF directly. If anyone knows of the function to print the stream directly out, is there also a way to get the byte length of the stream without actually reading it in.
Since no one has posted an answer this I may as well post the answer I've found.
Open a stream to php://output with fopen mode w, and use stream_copy_to_stream to send the data from the proc_open process to the user directly. There does not appear to be an easy method to get the length or size of the data in the stream however.
$descriptorspec = array(
0 => array("pipe","r"),
1 => array("pipe","w"),
2 => array("file","error.txt","a") );
$process = proc_open($command, $descriptorspec, $pipes);
if( is_resource( $process ) ) {
fwrite($pipes[0], $fdf);
fclose($pipes[0]);
/* New Code */
if( $fout = fopen("php://output","w") ) {
stream_copy_to_stream($pipes[1],$fout);
fclose($fout);
}
fclose($pipes[1]);
$result = proc_close($process);
}
For some strange reason this
echo system("echo 'echo hello > /dev/pts/2' | /usr/bin/at 19:36");
Refuses to work from my php script, however the command works fine when I just enter it through command line.
I know php has permission to execute some commands. I can run 'ls' from the php script but not the 'at' command. I've tried playing around with file permissions, but so far to no avail :(
edit
Permissions for /usr/bin/at are:
-rwxr-sr-x 1 daemon daemon 42752 Jan 15 2011 at
I think it's a permissions problem, if I execute the php file from my ssh terminal it works fine, but not from the web.
What you are executing is
echo 'hello' > /dev/pts/2 | /usr/bin/at 19:36
meaning
echo 'hello' > /dev/pts/2
and pipe stdout to /usr/bin/at 19:36 but since you already redirected the echo to /dev/pts/2, this will be empty. What you probably meant to do is:
echo system("echo 'echo hello > /dev/pts/2' | /usr/bin/at 19:36");
You might also want to use shell_exec to pass the command through a shell or alternatively proc_open which gives you better control over stdin/out/err of the command you are executing. Your example would correspond to (adapted example from php.net docs):
<?php
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("pipe", "w") // stderr is a pipe that the child will write to
);
$process = proc_open('/usr/bin/at', $descriptorspec, $pipes);
if (is_resource($process)) {
fwrite($pipes[0], 'echo "hello" > /dev/pts/2');
fclose($pipes[0]);
$stdout = stream_get_contents($pipes[1]);
fclose($pipes[1]);
$stderr = stream_get_contents($pipes[2]);
fclose($pipes[2]);
$return_value = proc_close($process);
echo "command returned $return_value. stdout: $stdout, stderr: $stderr\n";
} else {
echo "Process failed";
}
?>
In your php.ini file check for disable_functions sometimes functions like system are disabled for security reasons.
I'm happily using proc_open to pipe data into another PHP process.
something like this
$spec = array (
0 => array('pipe', 'r'),
// I don't need output pipes
);
$cmd = 'php -f another.php >out.log 2>err.log';
$process = proc_open( $cmd, $spec, $pipes );
fwrite( $pipes[0], 'hello world');
fclose( $pipes[0] );
proc_close($process);
In the other PHP file I echo STDIN with:
echo file_get_contents('php://stdin');
This works fine, but not when I background it. Simply by appending $cmd with & I get nothing from STDIN. I must be missing something fundamental.
It also fails with fgets(STDIN)
Any ideas please?
You can't write to STDIN of a background process (at least, not in the normal way).
This question on Server Fault may give you some idea of how to work around this problem.
Unrelated: you say do don't need outputs in the spec, yet you specify them im your $cmd; you can write $spec like this:
$spec = array (
0 => array('pipe', 'r'),
1 => array('file', 'out.log', 'w'), // or 'a' to append
2 => array('file', 'err.log', 'w'),
);