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Full Discussion: How do I check if a process is running in C
Top Forums Programming How do I check if a process is running in C Post 302461706 by Praveen_218 on Tuesday 12th of October 2010 05:01:00 AM
Old 10-12-2010
Use pidof instead ...
You may want to use pidof. This prints the pid of the running process on the stdout.

Usually its available at path /sbin/pidof; hence either you need to be the superuser or have the read access.

The command is
Code:
Your Prompt] # pidof -x <your process name>

Use as below in your C code (although not advices to use the system(<cmd>) in a C code but then you already used the same):
Code:
int
main() {
   /*
   ** Code snippet.
   */
   if(0 == system("pidof -x PROCESS > /dev/null")) {
      //A process having name PROCESS is running.
   }
   else if(1 == system("pidof -x PROCESS > /dev/null")) {
      //A process having name PROCESS is NOT running.
   }

   /*
   ** Continue processing further.
   */
return STATUS;
}

Look at the return value to decide on its running status. You can get this by executing, from the command prompt, another command 'echo $?' immediately after executing the pidof.
 

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LEARN ABOUT CENTOS

killall5

KILLALL5(8)						Linux System Administrator's Manual					       KILLALL5(8)

NAME

       killall5 -- send a signal to all processes.

SYNOPSIS

       killall5 -signalnumber [-o omitpid[,omitpid..]]	[-o omitpid[,omitpid..]..]

DESCRIPTION

       killall5  is the SystemV killall command. It sends a signal to all processes except kernel threads and the processes in its own session, so
       it won't kill the shell that is running the script it was called from. Its primary (only) use is in the rc scripts found in the /etc/init.d
       directory.

OPTIONS

       -o omitpid
	      Tells killall5 to omit processes with that process id.

NOTES

       killall5 can also be invoked as pidof, which is simply a (symbolic) link to the killall5 program.

EXIT STATUS

       The  program  return  zero  if  it  killed  processes.  It return 2 if no process were killed, and 1 if it was unable to find any processes
       (/proc/ is missing).

SEE ALSO

       halt(8), reboot(8), pidof(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    04 Nov 2003 						       KILLALL5(8)
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