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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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| fd | ||
| kernel_copy | ||
| locks | ||
| os | ||
| os_str | ||
| process | ||
| alloc.rs | ||
| android.rs | ||
| args.rs | ||
| cmath.rs | ||
| env.rs | ||
| fd.rs | ||
| fs.rs | ||
| futex.rs | ||
| io.rs | ||
| kernel_copy.rs | ||
| l4re.rs | ||
| memchr.rs | ||
| mod.rs | ||
| net.rs | ||
| os_str.rs | ||
| os.rs | ||
| path.rs | ||
| pipe.rs | ||
| rand.rs | ||
| stack_overflow.rs | ||
| stdio.rs | ||
| thread_local_dtor.rs | ||
| thread_local_key.rs | ||
| thread_parker.rs | ||
| thread.rs | ||
| time.rs | ||
| weak.rs | ||