🚀 go-pugleaf

pmj <in@terra.es> wrote:

: � Donde puedo encontrar informaci�n de c�mo se programan los daemon
: (lenguaje C)  bajo Linux ?

#ifdef __sgi
#   define HAVE_DAEMONIZE
#endif

#ifndef HAVE_DAEMONIZE
/* _daemonize(3C) flags */
#define _DF_NOFORK      0x1     /* don't fork */
#define _DF_NOCHDIR     0x2     /* don't chdir to / */
#define _DF_NOCLOSE     0x4     /* close no files */

int my_daemonize(int flags, int fd1, int fd2, int fd3);
#define _daemonize my_daemonize
#endif

#define HAVE_SETSID 1 /* irix, linux, solaris */
...
if ( -1 == _daemonize(_DF_NOCHDIR,
	gprefs.f != NULL ? fileno(gprefs.f) : -1, -1,-1))
	perror("Can't daemonize");

...
int my_daemonize(int flags, int fd1, int fd2, int fd3)
{
    int status=0;
    int fd;

    debug_msg("daemonizing\n");

    if (!( flags & _DF_NOFORK ))
    {
        /* Fork and exit in the parent to disassociate from the
         * current process group and become the leader of a new
         * process group.
         */

        if ( -1 == (status = fork()))
        {
            perror("cant fork");
            exit(1);
        }
        else if ( status > 0 )
        {
            _exit(0);
        }

#if HAVE_SETSID
        setsid();
#endif


        if ( -1 == (status = fork()))
        {
            perror("cant fork again");
            exit(1);
        }
        else if ( status > 0 )
        {
            _exit(0);
        }
    }


#ifdef TIOCNOTTY
    if ( 0 < (fd = open("/dev/tty", O_RDWR)))
    {
        if (ioctl(fd, TIOCNOTTY, NULL) < 0)
        {
            perror("can't disassociate from the terminal");
            status=-1;
        }
        close(fd);
    }
#endif /* TIOCNOTTY */

    if (!(flags & _DF_NOCHDIR))
    {
        if (chdir("/.") < 0)
        {
            perror("can't chdir to /.");
            status=-1;
        }
    }

    if (!(flags & _DF_NOCLOSE))
    {
        long l;
        int i;

        l=sysconf(_SC_OPEN_MAX);

        while(l-->0)
        {
            if ((l!=fd1)&&(l!=fd2)&&(l!=fd3))
                close(l);
        }

        if ( -1 == ( i = open( "/dev/null", O_RDWR)))
        {
            perror("/dev/null");
            status=-1;
        }
        else
        {
            if ((1!=fd1)&&(1!=fd2)&&(1!=fd3))
                dup(i);
            if ((2!=fd1)&&(2!=fd2)&&(2!=fd3))
                dup(i);
        }
    }
    return(status);
}
#endif








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