Get PID, when have program name fragment

Question

I need to kill java process, that runs main class blabla.class. I can use function kill(pid_t, SIGKILL) for this reason, but I need to get PID ID.

I could run linux command ps-ax | grep blabla to find PID ID. What is the best way to do this using C ?

Answer 1

Adapting the link given by Marco https://stackoverflow.com/a/8166467/1967396:

#define LEN 100
char line[LEN];
FILE *cmd = popen("ps -ax | grep blabla", "r");

fgets(line, LEN, cmd);
// now parse `line` for the information you want, using sscanf perhaps?
// I believe the pid is the first word on the line returned, and it fits in an int:
int pid;
sscanf(line, "%d", &pid);

pclose(cmd);