Support `#[unix_sigpipe = "inherit|sig_dfl"]` on `fn main()` to preven...
source link: https://github.com/rust-lang/rust/pull/97802
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When enabled, programs don't have to explicitly handle ErrorKind::BrokenPipe any longer. Currently, the program
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
#![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 #62569 and referenced issues for discussions regarding the SIGPIPE problem itself
See the this Zulip topic for more discussions, including about this PR.
Tracking issue: #97889
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