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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 OSF1

getpgid

getpgid(2)							System Calls Manual							getpgid(2)

NAME

       getpgid - Gets process group ID

LIBRARY

       Standard C Library (libc.a)

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>
       pid_t getpgid(	   pid_t pid);

PARAMETERS

       Specifies the process ID of the target process; zero implies the calling process.

DESCRIPTION

       The  getpgid()  function returns the process group ID of the process specified by the process ID pid.  Specifying a pid of 0 (zero) returns
       the process group ID of the calling process.

RETURN VALUES

       The getpgid() function returns the process group ID of the process specified.  If there was an error, a value of -1 is returned	and  errno
       is set to indicate the error.

ERRORS

       If  any	of  the following conditions occurs, the getpgid() function sets errno to the corresponding value: The specified process is not in
       the same session as the calling process, and the calling process lacks sufficient privilege to read the specified  process.   As  released,
       Tru64 UNIX does not check the privilege.  No process has been found that has a process ID identical to that specified by the pid parameter.

RELATED INFORMATION

       Functions: exec(2), fork(2), setpgid(2) delim off

																	getpgid(2)
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