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Auto merge of #101077 - sunshowers:signal-mask-inherit, r=sunshowers

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Change process spawning to inherit the parent's signal mask by default

Previously, the signal mask was always reset when a child process is
started. This breaks tools like `nohup` which expect `SIGHUP` to be
blocked for all transitive processes.

With this change, the default behavior changes to inherit the signal mask.

This also changes the signal disposition for `SIGPIPE` to only be changed if the `#[unix_sigpipe]` attribute isn't set.
This commit is contained in:
bors 2022-10-21 18:09:03 +00:00
commit 57e2c06a8d
8 changed files with 136 additions and 72 deletions
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13
compiler/rustc_session/src/config/sigpipe.rs
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@ -1,5 +1,13 @@
//! NOTE: Keep these constants in sync with `library/std/src/sys/unix/mod.rs`!
/// The default value if `#[unix_sigpipe]` is not specified. This resolves
/// to `SIG_IGN` in `library/std/src/sys/unix/mod.rs`.
///
/// Note that `SIG_IGN` has been the Rust default since 2014. See
/// <https://github.com/rust-lang/rust/issues/62569>.
#[allow(dead_code)]
pub const DEFAULT: u8 = 0;
/// Do not touch `SIGPIPE`. Use whatever the parent process uses.
#[allow(dead_code)]
pub const INHERIT: u8 = 1;
@ -15,8 +23,3 @@ pub const SIG_IGN: u8 = 2;
/// such as `head -n 1`.
#[allow(dead_code)]
pub const SIG_DFL: u8 = 3;
/// `SIG_IGN` has been the Rust default since 2014. See
/// <https://github.com/rust-lang/rust/issues/62569>.
#[allow(dead_code)]
pub const DEFAULT: u8 = SIG_IGN;