I have an issue with a program written in C++. I want to open a SOCKS5 proxy on a free port then check if is ok (check with curl), then release the I/O blocking. This is the code :
C++
main() { char* s_sockshost = "127.0.0.1"; socks_port = find_empty_port(); if(fork()) { // child process continues and opens a socks open_proxy(); } else { // parrent process just checks something then dies for(int i = 0; i < 20; i++) { proxytest = curlsockstest(s_sockshost,socks_port); if(proxytest) { break; } sleep(1); } if(proxytest) { if(hitdebug >= 3) printf("check_result : is opened on %s",socks_port); exit(0); // kill just this process } else { if(hitdebug >= 3) printf("check_result : is bad\n"); kill(getppid(), SIGKILL); // kill both processes } } } If i do this from cmd like
./proxy; ls -al; then it is executing and executes the command after it, but if i do it from PHP or NODEJS it is hanging, like expecting to finish.
NODEJS:
var exec = require('child_process').exec; var cmd = './proxy; ls -al;'; setTimeout(function(){ console.log("Timer"); exec(cmd, function(error, stdout, stderr) { console.log("error: "); console.log(error); console.log(); console.log("stdout: "); console.log(stdout); console.log(); console.log("stderr: "); console.log(stderr); console.log(); }); console.log("Timer end"); },2000); PHP:
<?php echo "Run start\n"; $array_exec = array(); // exec("./proxy",$array_exec); system("./proxy"); var_dump($array_exec); echo "Run end\n"; ?> What is the explination and how can i solve this?
I am thinking to make PHP and NODEJS comunicating with this C++ app with sqlite or something like that...
2 Answers
Answers 1
The system() function would wait until the process is finished and collect the entire output.
You should either use daemon for your C++ or you can simply change it to: ./proxy & and if you don't need output, ./proxy & > /dev/null
<?php echo "Run start\n"; $array_exec = array(); shell_exec("./proxy &",$array_exec); var_dump($array_exec); echo "Run end\n"; ?> Answers 2
Node.js
const { spawn } = require('child_process'); const ls = spawn('proxy'); ls.stdout.on('data', (data) => { console.log(`stdout: ${data}`); }); ls.stderr.on('data', (data) => { console.log(`stderr: ${data}`); }); ls.on('close', (code) => { console.log(`child process exited with code ${code}`); }); 
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