find_pid_by_name

find_pid_by_name.c

int find_pid_of(const char *process_name)    
{    
    int id;    
    pid_t pid = -1;    
    DIR* dir;    
    FILE *fp;    
    char filename[32];    
    char cmdline[256];    
    
    struct dirent * entry;    
    
    if (process_name == NULL)    
        return -1;    
    
    dir = opendir("/proc");    
    if (dir == NULL)    
        return -1;    
    
    while((entry = readdir(dir)) != NULL) {    
        id = atoi(entry->d_name);    
        if (id != 0) {    
            sprintf(filename, "/proc/%d/cmdline", id);    
            fp = fopen(filename, "r");    
            if (fp) {    
                fgets(cmdline, sizeof(cmdline), fp);    
                fclose(fp);    
    
                if (strcmp(process_name, cmdline) == 0) {    
                    /* process found */    
                    pid = id;    
                    break;    
                }    
            }    
        }    
    }    
    
    closedir(dir);    
    return pid;    
}