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Full Discussion: Help with task daemon
Top Forums Programming Help with task daemon Post 302305387 by james2432 on Wednesday 8th of April 2009 07:15:24 PM
Old 04-08-2009
Help with task daemon

believe it or not but this is my first c program (i've worked with java, C#, php though) I am trying to make a daemon that checks if mplayer is running(it's for a projection room) and if it is not then to run mplayer with a file.. So far it's not working and I don't know why

Help and comments would be appreciated
Code:
#include <sys/types.h>  /* include this before any other sys headers */ 
#include <sys/wait.h>   /* header for waitpid() and various macros */ 
#include <signal.h>     /* header for signal functions */ 
#include <stdio.h>      /* header for fprintf() */ 
#include <unistd.h>     /* header for fork() */ 
 
void  ChildProcess(void);                /* child process prototype  */ 
void  ParentProcess(void);               /* parent process prototype */
 
int  main(void) 
{     pid_t pid;

    while(1){ 
            int rc;
            rc<<system("ps ux | awk '/mplayer/ && !/awk/ {print $2}'"); 
          rc = WEXITSTATUS(rc); /* Check if mplayer is running */ 
       if(rc >= 0 ){ 
              pid = fork(); 
              if(pid>=0){     
                if (pid == 0)  
                 ChildProcess(); 
                else  
                 ParentProcess(); 
                } 
              } 
       else 
          {/*fork error*/}
   
     }
return (0); 
} 
 
void  ChildProcess(void) 
{ 
     execvp("mplayer ~/test.avi",NULL); 
     exit(0); 
} 
 
void  ParentProcess(void) 
{ 
    sleep(2); 
    return; 
}

 
Test Your Knowledge in Computers #420
Difficulty: Medium
JavaScript supports much of the structured programming syntax from C (e.g., if statements, while loops, switch statements, do while loops, etc.).
True or False?

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UDISKS-DAEMON(8)						   udisks-daemon						  UDISKS-DAEMON(8)

NAME
udisks-daemon - udisks Daemon SYNOPSIS
udisks-daemon [--help] DESCRIPTION
udisks-daemon provides the org.freedesktop.UDisks service on the system message bus. Users or administrators should never need to start this daemon as it will be automatically started by dbus-daemon(1) whenever an application calls into the org.freedesktop.UDisks service. See the udisks(7) man page for information on how to customize how udisks-daemon works. OPTIONS
--help Show help options. AUTHOR
Written by David Zeuthen david@fubar.dk with a lot of help from many others. BUGS
Please send bug reports to either the distribution bug tracker or the upstream bug tracker at https://bugs.freedesktop.org/enter_bug.cgi?product=udisks. SEE ALSO
udisks(7), udisks(1), udisks-tcp-bridge(1), dbus-daemon(1) udisks April 2008 UDISKS-DAEMON(8)

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