cde0cde151
In the stabilization attempt of `#[unix_sigpipe = "sig_dfl"]`, a concern was raised related to using a language attribute for the feature: Long term, we want `fn lang_start()` to be definable by any crate, not just libstd. Having a special language attribute in that case becomes awkward. So as a first step towards towards the next stabilization attempt, this PR changes the `#[unix_sigpipe = "..."]` attribute to a compiler flag `-Zon-broken-pipe=...` to remove that concern, since now the language is not "contaminated" by this feature. Another point was also raised, namely that the ui should not leak **how** it does things, but rather what the **end effect** is. The new flag uses the proposed naming. This is of course something that can be iterated on further before stabilization.
35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
// It is UB to unwind out of `fn start()` according to
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// https://doc.rust-lang.org/beta/unstable-book/language-features/start.html so
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// panic with abort to avoid UB:
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//@ compile-flags: -Cpanic=abort
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//@ no-prefer-dynamic so panic=abort works
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#![feature(start, rustc_private)]
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extern crate libc;
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// Use #[start] so we don't have a runtime that messes with SIGPIPE.
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#[start]
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fn start(argc: isize, argv: *const *const u8) -> isize {
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assert_eq!(argc, 2, "Must pass SIG_IGN or SIG_DFL as first arg");
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let arg1 = unsafe { std::ffi::CStr::from_ptr(*argv.offset(1) as *const libc::c_char) }
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.to_str()
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.unwrap();
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let expected = match arg1 {
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"SIG_IGN" => libc::SIG_IGN,
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"SIG_DFL" => libc::SIG_DFL,
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arg => panic!("Must pass SIG_IGN or SIG_DFL as first arg. Got: {}", arg),
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};
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let actual = unsafe {
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let mut actual: libc::sigaction = std::mem::zeroed();
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libc::sigaction(libc::SIGPIPE, std::ptr::null(), &mut actual);
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actual.sa_sigaction
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};
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assert_eq!(actual, expected, "actual and expected SIGPIPE disposition in child differs");
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0
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}
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