Uzyskanie identyfikatora procesu

Witam!

Czy mógłbym prosić o podpowiedź w jaki sposób w języku c uzyskać pid procesu znając jego nazwę?

Unix? Windows? Biblioteka?

pid_t proc_find(const char* name) 
{
    DIR* dir;
    struct dirent* ent;
    char* endptr;
    char buf[512];
    
    if (!(dir = opendir("/proc"))) {
        perror("can't open /proc");
        return -1;
    }

    while((ent = readdir(dir)) != NULL) {
        /* if endptr is not a null character, the directory is not
         * entirely numeric, so ignore it */
        long lpid = strtol(ent->d_name, &endptr, 10);
        if (*endptr != '\0') {
            continue;
        }

        /* try to open the cmdline file */
        snprintf(buf, sizeof(buf), "/proc/%ld/cmdline", lpid);
        FILE* fp = fopen(buf, "r");
        
        if (fp) {
            if (fgets(buf, sizeof(buf), fp) != NULL) {
                /* check the first token in the file, the program name */
                char* first = strtok(buf, " ");
                if (!strcmp(first, name)) {
                    fclose(fp);
                    closedir(dir);
                    return (pid_t)lpid;
                }
            }
            fclose(fp);
        }
        
    }
    
    closedir(dir);
    return -1;
}