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Getting the return value of an exec process


Getting the return value of an exec process

By : Fadi Bkourh
Date : October 26 2020, 11:51 AM
will help you Sorry, your question still isn't very clear. You want foo to have the same exit code as bar? Does foo have to do anything after bar exits?
exec() is going to completely replace the running process, so if you call exec() without first calling fork() then foo will be replaced by bar, and so the exit code will be whatever bar returns.
code :


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PHP exec() return value for background process (linux)

PHP exec() return value for background process (linux)


By : user1494113
Date : March 29 2020, 07:55 AM
I hope this helps you . My guess is that what you are trying to do is not directly possible. By backgrounding the process, you are letting your PHP script continue (and potentially exit) before a result exists.
A work around is to have a second PHP (or Bash/etc) script that just does the command execution and writes the result to a temp file.
code :
$resultFile = '/tmp/result001';
touch($resultFile);
exec('php command_runner.php '.escapeshellarg($resultFile).' > /dev/null 2>&1 &');

// do other stuff...    

// Sometime later when you want to check the result...
while (!strlen(file_get_contents($resultFile))) {
    sleep(5);
}
$result = intval(file_get_contents($resultFile));
unlink($resultFile);
$outputFile = $argv[0];
exec('badcommand > /dev/null 2>&1', $output, $result);
file_put_contents($outputFile, $result);
Php exec() return code is -1 when in a forked process, but 0 in a normal script

Php exec() return code is -1 when in a forked process, but 0 in a normal script


By : user2072535
Date : March 29 2020, 07:55 AM
it fixes the issue I am using exec() inside a a script that runs as a daemon and forks child processes using the pear class Net_Server.
code :
 pcntl_signal(SIGCHLD, SIG_DFL);
 exec('...');
 pcntl_signal(SIGCHLD, 'whatever it was');
node.js: Is there a way for the callback function of child_process.exec() to return the process PID

node.js: Is there a way for the callback function of child_process.exec() to return the process PID


By : sloh
Date : March 29 2020, 07:55 AM
With these it helps Node.JS Exec Question:
code :
var child = child_process.exec(..., function() {
    console.log( child.pid );
});
var create_child = function( i ) {
    // creates a seperate scope for child variable
    var child = child_process.exec(..., function() {
        console.log( child.pid );
    });
};

for (var i = 0; i < 100; i++) {
    // does not create a seperate scope
    create_child( i );
}
RunTime.exec does not return errors from the process

RunTime.exec does not return errors from the process


By : Josh Shiau
Date : March 29 2020, 07:55 AM
Hope that helps exec() succeeds when it has managed to started that process.
To find out the return value of the sqlite3 process, you have to use the Process object to wait for it to end, and then to read its exit value.
How to get the return value of child process to its parent which was created using exec?

How to get the return value of child process to its parent which was created using exec?


By : Steve
Date : March 29 2020, 07:55 AM
I hope this helps you . It depends on the o/s and its support for SA_SIGINFO. If you read the specification of POSIX sigaction() carefully, and if you use SA_SIGINFO to capture extra information about the signals delivered, and you catch the SIGCHLD signal, then you may be able to get extra information, as documented in Signal Actions and .
In particular, the documentation notes that when the signal is SIGCHLD, then:
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