#include <assert.h>

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

int main() {

int err;

int stdin, null, dev;

char buffer[256];

char* result;

stdin = open("/dev/stdin", O_RDONLY);

null = open("/dev/null", O_RDONLY);

dev = open("/dev", O_RDONLY);

result = ctermid(buffer);

assert(!strcmp(result, "/dev/tty"));

// strstr instead of strcmp as native code may

// be using a virtual console (e.g. /dev/tty02)

err = ttyname_r(stdin, buffer, 256);

assert(!err);

assert(strstr(buffer, "/dev/tty"));

err = ttyname_r(stdin, buffer, 2);

assert(err == ERANGE);

result = ttyname(stdin);

assert(strstr(result, "/dev/tty"));

result = ttyname(null);

assert(!result);

result = ttyname(dev);

assert(!result);

puts("success");

return EXIT_SUCCESS;

}