Node.js spawning a child process interactively with separate stdout and stderr streams

Question

Consider the following C program (test.c):

#include 

int main() {
  printf(\"string out 1\\n\");
  fprintf(stderr, \"string err 1\\n\");
  ge         


        

Answer 1

You can do this :

var TEST_EXEC = 'test';
var spawn = require('child_process').spawn;
var test = spawn(TEST_EXEC);

test.stdin.pipe(process.stdin);
test.stdout.pipe(process.stdout);
test.stderr.pipe(process.stderr);

When you use events on stdout and stderr to print the output on console.log, you will get jumbled output because of asynchronous execution of the functions. The output will be ordered for a stream independently, but output can still get interleaved among stdin,stdout and stderr.