my program exectute mencoder program(from MPlayer) by using system function in program.

I want to kill process of mencoder in my program.

ex) int main()
{
// running program
}

void run_mencoder()
{
// system("mencoder");
}

void kill_mencoder()
{
// system("kill -9 ????"); //????->mencoder process ID
}

how to know process ID of mencoder?

The command is "pidof" which will be used as:

thank you very much your reply~

I have a one more question.

How to get return value (PID) of "pidof" in my program ?

PID=`pidof xxxx`
echo $PID

replace xxxx with ur process name.

I want to use "pidof" program in my app by calling system function.

system function can't return value of "pidof"

How to get return value of "pidof" in my application.

Why not make it simpler and just do this:

I had a similar kind of work. If you want to get the process-id of a currently running process, you search thru the /proc directories. Inside this /proc you can see some directories named using numbers, those are all actually process-id's, and symbolic link exe inside each numbered directory will show the process-name.

This link will provide more information: http://www.linuxexposed.com/Articles...em---proc.html

I had written a small program, to get the process id of a process which was created using system(). I thought this will be usefull. The code is here...


#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>

unsigned int getProcessID( char *process )
{
int target_link;
DIR *dir_p;
DIR *dir_proc;
struct dirent *dir_entry_p;
struct dirent *dir_proc_p;
char dir_name[35];
char target_name[235];
char exe_link[235];
char process_id[20];
int i;

dir_p = opendir( "/proc/" ); /* Open /proc/ directory */

while( NULL != (dir_entry_p = readdir(dir_p))) /* Reading /proc/ entries */
{
if ( strspn( dir_entry_p->d_name, "0123456789" ) == strlen( dir_entry_p->d_name ) ) /* Checking for numbered directories */
{
strcpy( process_id, dir_entry_p->d_name ); /* Saving the numbered directory i.e process-id */

strcpy( dir_name, "/proc/" );
strcat( dir_name, dir_entry_p->d_name );
strcat( dir_name, "/" ); /* Obtaining the full-path eg: /proc/24657/ */

if ( ( dir_proc = opendir( dir_name ) ) ) /* Open that numbered directory */
{
while ( ( dir_proc_p = readdir( dir_proc ) ) ) /* Reading its entries */
{
if ( strcmp( dir_proc_p->d_name, "exe" ) == 0 ) /* Check for that exe link file */
{
strcat( exe_link, dir_name );
strcat( exe_link, dir_proc_p->d_name ); /* Getting the full-path of that exe link */

/* Getting the target of the exe ie to which binary it points to */
target_link = readlink( exe_link, target_name, sizeof( target_name ) );
target_name[ target_link ] = '\0';

if ( strstr( target_name, process ) != NULL ) /* Searching for process name in the target name */
{
printf( "\n\n%s FOUND --- PROCESS_ID %s \n\n\n", process, process_id );
return atoi(process_id); /* GOT IT: return the process-id */
}

strcpy( exe_link ,"" );
}
}
}
else
printf( "Dir %s opening failed \n", dir_name );
}
}

closedir(dir_p);
return 0;
}


int main()
{
system( "emacs &" );
printf( " %u ", getProcessID( "emacs" ) );
return 0;
}


I was able to use this program successfully. Let me know if there are some other ways.