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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/issues/issue-30490.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/issues/issue-30490.rs')
-rw-r--r-- | tests/ui/issues/issue-30490.rs | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/tests/ui/issues/issue-30490.rs b/tests/ui/issues/issue-30490.rs new file mode 100644 index 000000000..4f0eeac8f --- /dev/null +++ b/tests/ui/issues/issue-30490.rs @@ -0,0 +1,102 @@ +// run-pass +// ignore-emscripten no processes +// ignore-sgx no processes +// ignore-fuchsia Child I/O swaps not privileged + +// Previously libstd would set stdio descriptors of a child process +// by `dup`ing the requested descriptors to inherit directly into the +// stdio descriptors. This, however, would incorrectly handle cases +// where the descriptors to inherit were already stdio descriptors. +// This test checks to avoid that regression. + +#![cfg_attr(unix, feature(rustc_private))] +#![cfg_attr(not(unix), allow(unused_imports))] + +#[cfg(unix)] +extern crate libc; + +use std::fs::File; +use std::io::{Read, Write}; +use std::io::{stdout, stderr}; +use std::process::{Command, Stdio}; + +#[cfg(unix)] +use std::os::unix::io::FromRawFd; + +#[cfg(not(unix))] +fn main() { + // Bug not present in Windows +} + +#[cfg(unix)] +fn main() { + let mut args = std::env::args(); + let name = args.next().unwrap(); + let args: Vec<String> = args.collect(); + if let Some("--child") = args.get(0).map(|s| &**s) { + return child(); + } else if !args.is_empty() { + panic!("unknown options"); + } + + let stdout_backup = unsafe { libc::dup(libc::STDOUT_FILENO) }; + let stderr_backup = unsafe { libc::dup(libc::STDERR_FILENO) }; + assert!(stdout_backup > -1); + assert!(stderr_backup > -1); + + let (stdout_reader, stdout_writer) = pipe(); + let (stderr_reader, stderr_writer) = pipe(); + assert!(unsafe { libc::dup2(stdout_writer, libc::STDOUT_FILENO) } > -1); + assert!(unsafe { libc::dup2(stderr_writer, libc::STDERR_FILENO) } > -1); + + // Make sure we close any duplicates of the writer end of the pipe, + // otherwise we can get stuck reading from the pipe which has open + // writers but no one supplying any input + assert_eq!(unsafe { libc::close(stdout_writer) }, 0); + assert_eq!(unsafe { libc::close(stderr_writer) }, 0); + + stdout().write_all("parent stdout\n".as_bytes()).expect("failed to write to stdout"); + stderr().write_all("parent stderr\n".as_bytes()).expect("failed to write to stderr"); + + let child = { + Command::new(name) + .arg("--child") + .stdin(Stdio::inherit()) + .stdout(unsafe { Stdio::from_raw_fd(libc::STDERR_FILENO) }) + .stderr(unsafe { Stdio::from_raw_fd(libc::STDOUT_FILENO) }) + .spawn() + }; + + // The Stdio passed into the Command took over (and closed) std{out, err} + // so we should restore them as they were. + assert!(unsafe { libc::dup2(stdout_backup, libc::STDOUT_FILENO) } > -1); + assert!(unsafe { libc::dup2(stderr_backup, libc::STDERR_FILENO) } > -1); + + // Using File as a shim around the descriptor + let mut read = String::new(); + let mut f: File = unsafe { FromRawFd::from_raw_fd(stdout_reader) }; + f.read_to_string(&mut read).expect("failed to read from stdout file"); + assert_eq!(read, "parent stdout\nchild stderr\n"); + + // Using File as a shim around the descriptor + read.clear(); + let mut f: File = unsafe { FromRawFd::from_raw_fd(stderr_reader) }; + f.read_to_string(&mut read).expect("failed to read from stderr file"); + assert_eq!(read, "parent stderr\nchild stdout\n"); + + assert!(child.expect("failed to execute child process").wait().unwrap().success()); +} + +#[cfg(unix)] +fn child() { + stdout().write_all("child stdout\n".as_bytes()).expect("child failed to write to stdout"); + stderr().write_all("child stderr\n".as_bytes()).expect("child failed to write to stderr"); +} + +#[cfg(unix)] +/// Returns a pipe (reader, writer combo) +fn pipe() -> (i32, i32) { + let mut fds = [0; 2]; + assert_eq!(unsafe { libc::pipe(fds.as_mut_ptr()) }, 0); + (fds[0], fds[1]) +} |