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use std::path::Path;
use std::os::unix::prelude::*;
use nix::fcntl::{O_RDWR, open};
use nix::pty::*;
use nix::sys::stat;
use nix::sys::termios::*;
use nix::unistd::{read, write, close};
/// Helper function analogous to std::io::Read::read_exact, but for `RawFD`s
fn read_exact(f: RawFd, buf: &mut [u8]) {
let mut len = 0;
while len < buf.len() {
// get_mut would be better than split_at_mut, but it requires nightly
let (_, remaining) = buf.split_at_mut(len);
len += read(f, remaining).unwrap();
}
}
/// Test equivalence of `ptsname` and `ptsname_r`
#[test]
#[cfg(any(target_os = "android", target_os = "linux"))]
fn test_ptsname_equivalence() {
// Open a new PTTY master
let master_fd = posix_openpt(O_RDWR).unwrap();
assert!(master_fd.as_raw_fd() > 0);
// Get the name of the slave
let slave_name = ptsname(&master_fd).unwrap();
let slave_name_r = ptsname_r(&master_fd).unwrap();
assert_eq!(slave_name, slave_name_r);
}
/// Test data copying of `ptsname`
// TODO need to run in a subprocess, since ptsname is non-reentrant
#[test]
#[cfg(any(target_os = "android", target_os = "linux"))]
fn test_ptsname_copy() {
// Open a new PTTY master
let master_fd = posix_openpt(O_RDWR).unwrap();
assert!(master_fd.as_raw_fd() > 0);
// Get the name of the slave
let slave_name1 = ptsname(&master_fd).unwrap();
let slave_name2 = ptsname(&master_fd).unwrap();
assert!(slave_name1 == slave_name2);
// Also make sure that the string was actually copied and they point to different parts of
// memory.
assert!(slave_name1.as_ptr() != slave_name2.as_ptr());
}
/// Test data copying of `ptsname_r`
#[test]
#[cfg(any(target_os = "android", target_os = "linux"))]
fn test_ptsname_r_copy() {
// Open a new PTTY master
let master_fd = posix_openpt(O_RDWR).unwrap();
assert!(master_fd.as_raw_fd() > 0);
// Get the name of the slave
let slave_name1 = ptsname_r(&master_fd).unwrap();
let slave_name2 = ptsname_r(&master_fd).unwrap();
assert!(slave_name1 == slave_name2);
assert!(slave_name1.as_ptr() != slave_name2.as_ptr());
}
/// Test that `ptsname` returns different names for different devices
#[test]
#[cfg(any(target_os = "android", target_os = "linux"))]
fn test_ptsname_unique() {
// Open a new PTTY master
let master1_fd = posix_openpt(O_RDWR).unwrap();
assert!(master1_fd.as_raw_fd() > 0);
// Open a second PTTY master
let master2_fd = posix_openpt(O_RDWR).unwrap();
assert!(master2_fd.as_raw_fd() > 0);
// Get the name of the slave
let slave_name1 = ptsname(&master1_fd).unwrap();
let slave_name2 = ptsname(&master2_fd).unwrap();
assert!(slave_name1 != slave_name2);
}
/// Test opening a master/slave PTTY pair
///
/// This is a single larger test because much of these functions aren't useful by themselves. So for
/// this test we perform the basic act of getting a file handle for a connect master/slave PTTY
/// pair.
#[test]
fn test_open_ptty_pair() {
// Open a new PTTY master
let master_fd = posix_openpt(O_RDWR).unwrap();
assert!(master_fd.as_raw_fd() > 0);
// Allow a slave to be generated for it
grantpt(&master_fd).unwrap();
unlockpt(&master_fd).unwrap();
// Get the name of the slave
let slave_name = ptsname(&master_fd).unwrap();
// Open the slave device
let slave_fd = open(Path::new(&slave_name), O_RDWR, stat::Mode::empty()).unwrap();
assert!(slave_fd > 0);
}
#[test]
fn test_openpty() {
let pty = openpty(None, None).unwrap();
assert!(pty.master > 0);
assert!(pty.slave > 0);
// Writing to one should be readable on the other one
let string = "foofoofoo\n";
let mut buf = [0u8; 10];
write(pty.master, string.as_bytes()).unwrap();
read_exact(pty.slave, &mut buf);
assert_eq!(&buf, string.as_bytes());
// Read the echo as well
let echoed_string = "foofoofoo\r\n";
let mut buf = [0u8; 11];
read_exact(pty.master, &mut buf);
assert_eq!(&buf, echoed_string.as_bytes());
let string2 = "barbarbarbar\n";
let echoed_string2 = "barbarbarbar\r\n";
let mut buf = [0u8; 14];
write(pty.slave, string2.as_bytes()).unwrap();
read_exact(pty.master, &mut buf);
assert_eq!(&buf, echoed_string2.as_bytes());
close(pty.master).unwrap();
close(pty.slave).unwrap();
}
#[test]
fn test_openpty_with_termios() {
// Open one pty to get attributes for the second one
let mut termios = {
let pty = openpty(None, None).unwrap();
assert!(pty.master > 0);
assert!(pty.slave > 0);
let termios = tcgetattr(pty.master).unwrap();
close(pty.master).unwrap();
close(pty.slave).unwrap();
termios
};
termios.c_oflag &= !ONLCR;
let pty = openpty(None, &termios).unwrap();
// Must be valid file descriptors
assert!(pty.master > 0);
assert!(pty.slave > 0);
// Writing to one should be readable on the other one
let string = "foofoofoo\n";
let mut buf = [0u8; 10];
write(pty.master, string.as_bytes()).unwrap();
read_exact(pty.slave, &mut buf);
assert_eq!(&buf, string.as_bytes());
// read the echo as well
let echoed_string = "foofoofoo\n";
read_exact(pty.master, &mut buf);
assert_eq!(&buf, echoed_string.as_bytes());
let string2 = "barbarbarbar\n";
let echoed_string2 = "barbarbarbar\n";
let mut buf = [0u8; 13];
write(pty.slave, string2.as_bytes()).unwrap();
read_exact(pty.master, &mut buf);
assert_eq!(&buf, echoed_string2.as_bytes());
close(pty.master).unwrap();
close(pty.slave).unwrap();
}
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