Is running native CPU ?

自身がロゼッタで動いているか、どうなのかを調べる低レベルな方法。

static int sysctlbyname_with_pid (const char *name, pid_t pid,
                            void *oldp, size_t *oldlenp,
                            void *newp, size_t newlen)
{
    if (pid == 0) {
        if (sysctlbyname(name, oldp, oldlenp, newp, newlen) == -1)  {
            fprintf(stderr, "sysctlbyname_with_pid(0): sysctlbyname  failed:"
                     "%s\n", strerror(errno));
            return -1;
        }
    } else {
        int mib[CTL_MAXNAME+1];
        size_t len = CTL_MAXNAME;
        if (sysctlnametomib(name, mib, &len) == -1) {
            fprintf(stderr, "sysctlbyname_with_pid: sysctlnametomib  failed:"
                     "%s\n", strerror(errno));
            return -1;
        }
        mib[len] = pid;
        len++;
        if (sysctl(mib, len, oldp, oldlenp, newp, newlen) == -1)  {
            fprintf(stderr, "sysctlbyname_with_pid: sysctl  failed:"
                    "%s\n", strerror(errno));
            return -1;
        }
    }
    return 0;
}

int is_pid_native (pid_t pid)
{
    int ret = 0;
    size_t sz = sizeof(ret);
 
    if (sysctlbyname_with_pid("sysctl.proc_native", pid,
                &ret, &sz, NULL, 0) == -1) {
         if (errno == ENOENT) {
            return 1;
        }
        fprintf(stderr, "is_pid_native: sysctlbyname_with_pid  failed:"
                "%s\n", strerror(errno));
        return -1;
    }
    return ret;
}

参考：http://developer.apple.com/documentation/MacOSX/Conceptual/universal_binary/universal_binary_exec_a/universal_binary_exec_a.html#//apple_ref/doc/uid/TP40002217-CH210-239589