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8c6ce6b91b
Support `#[unix_sigpipe = "inherit|sig_dfl"]` on `fn main()` to prevent ignoring `SIGPIPE`
When enabled, programs don't have to explicitly handle `ErrorKind::BrokenPipe` any longer. Currently, the program
```rust
fn main() { loop { println!("hello world"); } }
```
will print an error if used with a short-lived pipe, e.g.
% ./main | head -n 1
hello world
thread 'main' panicked at 'failed printing to stdout: Broken pipe (os error 32)', library/std/src/io/stdio.rs:1016:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
by enabling `#[unix_sigpipe = "sig_dfl"]` like this
```rust
#![feature(unix_sigpipe)]
#[unix_sigpipe = "sig_dfl"]
fn main() { loop { println!("hello world"); } }
```
there is no error, because `SIGPIPE` will not be ignored and thus the program will be killed appropriately:
% ./main | head -n 1
hello world
The current libstd behaviour of ignoring `SIGPIPE` before `fn main()` can be explicitly requested by using `#[unix_sigpipe = "sig_ign"]`.
With `#[unix_sigpipe = "inherit"]`, no change at all is made to `SIGPIPE`, which typically means the behaviour will be the same as `#[unix_sigpipe = "sig_dfl"]`.
See https://github.com/rust-lang/rust/issues/62569 and referenced issues for discussions regarding the `SIGPIPE` problem itself
See the [this](https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Proposal.3A.20First.20step.20towards.20solving.20the.20SIGPIPE.20problem) Zulip topic for more discussions, including about this PR.
Tracking issue: https://github.com/rust-lang/rust/issues/97889
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| .. | ||
| abi | ||
| debuginfo | ||
| driver | ||
| intrinsics | ||
| optimize | ||
| allocator.rs | ||
| analyze.rs | ||
| archive.rs | ||
| base.rs | ||
| cast.rs | ||
| codegen_i128.rs | ||
| common.rs | ||
| compiler_builtins.rs | ||
| concurrency_limiter.rs | ||
| config.rs | ||
| constant.rs | ||
| discriminant.rs | ||
| global_asm.rs | ||
| inline_asm.rs | ||
| lib.rs | ||
| linkage.rs | ||
| main_shim.rs | ||
| num.rs | ||
| pointer.rs | ||
| pretty_clif.rs | ||
| toolchain.rs | ||
| trap.rs | ||
| unsize.rs | ||
| value_and_place.rs | ||
| vtable.rs | ||