Start program in daemon mode from cgi-bin

Xa! · 11-30-2004, 10:51 AM

Hello!

I have a simple

Code:

while(statement){}

program written on c. I start it from http://mysite/cgi-bin/simple_program and it works fine until I close browser. When I click close button my simple_program terminates too.

How to start it in a such way, so it continues working after closing browser?

randyding · 11-30-2004, 11:00 PM

This is the code I've used in a CGI to "background" the program so that does not happen. Call this function first thing in your CGI program main().

Code:

int daemon_init(void) {
    pid_t pid;
    int j, fd;


    pid=fork(); //child=0, parent=pid of child or -1 on error
    if (pid<0) return 0;    //-1 failed
    if (pid>0) exit(0);     //pid of child, parent terminates
    //pid is 0, child continues
    //setsid();   //become session leader
    chdir("/"); //change working directory
    umask(0);   //clear our file mode creation mask
    for (j=0; j<3; j++) {
        close(j);
        fd=open("/dev/null",j ? O_WRONLY : O_RDONLY);
        if (fd!=j) break;
    }
    return 3==j;
}    //daemon_init()