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//@ignore-target: windows # No libc socketpair on Windows
// test_race depends on a deterministic schedule.
//@compile-flags: -Zmiri-deterministic-concurrency
// FIXME(static_mut_refs): Do not allow `static_mut_refs` lint
#![allow(static_mut_refs)]
use std::thread;
#[path = "../../utils/libc.rs"]
mod libc_utils;
fn main() {
test_socketpair();
test_socketpair_threaded();
test_race();
test_blocking_read();
test_blocking_write();
test_socketpair_setfl_getfl();
}
fn test_socketpair() {
let mut fds = [-1, -1];
let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) };
assert_eq!(res, 0);
// Read size == data available in buffer.
let data = "abcde".as_bytes().as_ptr();
let res = unsafe { libc_utils::write_all(fds[0], data as *const libc::c_void, 5) };
assert_eq!(res, 5);
let mut buf: [u8; 5] = [0; 5];
let res =
unsafe { libc_utils::read_all(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) };
assert_eq!(res, 5);
assert_eq!(buf, "abcde".as_bytes());
// Read size > data available in buffer.
let data = "abc".as_bytes();
let res = unsafe { libc_utils::write_all(fds[0], data.as_ptr() as *const libc::c_void, 3) };
assert_eq!(res, 3);
let mut buf2: [u8; 5] = [0; 5];
let res = unsafe { libc::read(fds[1], buf2.as_mut_ptr().cast(), buf2.len() as libc::size_t) };
assert!(res > 0 && res <= 3);
let res = res as usize;
assert_eq!(buf2[..res], data[..res]);
if res < 3 {
// Drain the rest from the read end.
let res = unsafe { libc_utils::read_all(fds[1], buf2[res..].as_mut_ptr().cast(), 3 - res) };
assert!(res > 0);
}
// Test read and write from another direction.
// Read size == data available in buffer.
let data = "12345".as_bytes().as_ptr();
let res = unsafe { libc_utils::write_all(fds[1], data as *const libc::c_void, 5) };
assert_eq!(res, 5);
let mut buf3: [u8; 5] = [0; 5];
let res = unsafe {
libc_utils::read_all(fds[0], buf3.as_mut_ptr().cast(), buf3.len() as libc::size_t)
};
assert_eq!(res, 5);
assert_eq!(buf3, "12345".as_bytes());
// Read size > data available in buffer.
let data = "123".as_bytes();
let res = unsafe { libc_utils::write_all(fds[1], data.as_ptr() as *const libc::c_void, 3) };
assert_eq!(res, 3);
let mut buf4: [u8; 5] = [0; 5];
let res = unsafe { libc::read(fds[0], buf4.as_mut_ptr().cast(), buf4.len() as libc::size_t) };
assert!(res > 0 && res <= 3);
let res = res as usize;
assert_eq!(buf4[..res], data[..res]);
if res < 3 {
// Drain the rest from the read end.
let res = unsafe { libc_utils::read_all(fds[0], buf4[res..].as_mut_ptr().cast(), 3 - res) };
assert!(res > 0);
}
// Test when happens when we close one end, with some data in the buffer.
let res = unsafe { libc_utils::write_all(fds[0], data.as_ptr() as *const libc::c_void, 3) };
assert_eq!(res, 3);
unsafe { libc::close(fds[0]) };
// Reading the other end should return that data, then EOF.
let mut buf: [u8; 5] = [0; 5];
let res =
unsafe { libc_utils::read_all(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) };
assert_eq!(res, 3);
assert_eq!(&buf[0..3], "123".as_bytes());
let res =
unsafe { libc_utils::read_all(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) };
assert_eq!(res, 0); // 0-sized read: EOF.
// Writing the other end should emit EPIPE.
let res = unsafe { libc_utils::write_all(fds[1], data.as_ptr() as *const libc::c_void, 1) };
assert_eq!(res, -1);
assert_eq!(std::io::Error::last_os_error().raw_os_error(), Some(libc::EPIPE));
}
fn test_socketpair_threaded() {
let mut fds = [-1, -1];
let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) };
assert_eq!(res, 0);
let thread1 = thread::spawn(move || {
let mut buf: [u8; 5] = [0; 5];
let res: i64 = unsafe {
libc_utils::read_all(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t)
.try_into()
.unwrap()
};
assert_eq!(res, 5);
assert_eq!(buf, "abcde".as_bytes());
});
thread::yield_now();
let data = "abcde".as_bytes().as_ptr();
let res = unsafe { libc_utils::write_all(fds[0], data as *const libc::c_void, 5) };
assert_eq!(res, 5);
thread1.join().unwrap();
// Read and write from different direction
let thread2 = thread::spawn(move || {
thread::yield_now();
let data = "12345".as_bytes().as_ptr();
let res = unsafe { libc_utils::write_all(fds[1], data as *const libc::c_void, 5) };
assert_eq!(res, 5);
});
let mut buf: [u8; 5] = [0; 5];
let res =
unsafe { libc_utils::read_all(fds[0], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) };
assert_eq!(res, 5);
assert_eq!(buf, "12345".as_bytes());
thread2.join().unwrap();
}
fn test_race() {
static mut VAL: u8 = 0;
let mut fds = [-1, -1];
let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) };
assert_eq!(res, 0);
let thread1 = thread::spawn(move || {
let mut buf: [u8; 1] = [0; 1];
// write() from the main thread will occur before the read() here
// because preemption is disabled and the main thread yields after write().
let res: i32 = unsafe {
libc_utils::read_all(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t)
.try_into()
.unwrap()
};
assert_eq!(res, 1);
assert_eq!(buf, "a".as_bytes());
// The read above establishes a happens-before so it is now safe to access this global variable.
unsafe { assert_eq!(VAL, 1) };
});
unsafe { VAL = 1 };
let data = "a".as_bytes().as_ptr();
let res = unsafe { libc_utils::write_all(fds[0], data as *const libc::c_void, 1) };
assert_eq!(res, 1);
thread::yield_now();
thread1.join().unwrap();
}
// Test the behaviour of a socketpair getting blocked on read and subsequently unblocked.
fn test_blocking_read() {
let mut fds = [-1, -1];
let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) };
assert_eq!(res, 0);
let thread1 = thread::spawn(move || {
// Let this thread block on read.
let mut buf: [u8; 3] = [0; 3];
let res = unsafe {
libc_utils::read_all(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t)
};
assert_eq!(res, 3);
assert_eq!(&buf, "abc".as_bytes());
});
let thread2 = thread::spawn(move || {
// Unblock thread1 by doing writing something.
let data = "abc".as_bytes().as_ptr();
let res = unsafe { libc_utils::write_all(fds[0], data as *const libc::c_void, 3) };
assert_eq!(res, 3);
});
thread1.join().unwrap();
thread2.join().unwrap();
}
// Test the behaviour of a socketpair getting blocked on write and subsequently unblocked.
fn test_blocking_write() {
let mut fds = [-1, -1];
let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) };
assert_eq!(res, 0);
let arr1: [u8; 212992] = [1; 212992];
// Exhaust the space in the buffer so the subsequent write will block.
let res =
unsafe { libc_utils::write_all(fds[0], arr1.as_ptr() as *const libc::c_void, 212992) };
assert_eq!(res, 212992);
let thread1 = thread::spawn(move || {
let data = "abc".as_bytes().as_ptr();
// The write below will be blocked because the buffer is already full.
let res = unsafe { libc_utils::write_all(fds[0], data as *const libc::c_void, 3) };
assert_eq!(res, 3);
});
let thread2 = thread::spawn(move || {
// Unblock thread1 by freeing up some space.
let mut buf: [u8; 3] = [0; 3];
let res = unsafe {
libc_utils::read_all(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t)
};
assert_eq!(res, 3);
assert_eq!(buf, [1, 1, 1]);
});
thread1.join().unwrap();
thread2.join().unwrap();
}
/// Basic test for socketpair fcntl's F_SETFL and F_GETFL flag.
fn test_socketpair_setfl_getfl() {
// Initialise socketpair fds.
let mut fds = [-1, -1];
let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) };
assert_eq!(res, 0);
// Test if both sides have O_RDWR.
let res = unsafe { libc::fcntl(fds[0], libc::F_GETFL) };
assert_eq!(res, libc::O_RDWR);
let res = unsafe { libc::fcntl(fds[1], libc::F_GETFL) };
assert_eq!(res, libc::O_RDWR);
// Add the O_NONBLOCK flag with F_SETFL.
let res = unsafe { libc::fcntl(fds[0], libc::F_SETFL, libc::O_NONBLOCK) };
assert_eq!(res, 0);
// Test if the O_NONBLOCK flag is successfully added.
let res = unsafe { libc::fcntl(fds[0], libc::F_GETFL) };
assert_eq!(res, libc::O_RDWR | libc::O_NONBLOCK);
// The other side remains unchanged.
let res = unsafe { libc::fcntl(fds[1], libc::F_GETFL) };
assert_eq!(res, libc::O_RDWR);
// Test if O_NONBLOCK flag can be unset.
let res = unsafe { libc::fcntl(fds[0], libc::F_SETFL, 0) };
assert_eq!(res, 0);
let res = unsafe { libc::fcntl(fds[0], libc::F_GETFL) };
assert_eq!(res, libc::O_RDWR);
}
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