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This is a pretty basic test but should spot any other platforms which
are `#[cfg(unix)]` but not Unix and where the wait status
representation is wrong. (And any actual Unix platforms where it's
not as expected, but I don't think they exist.)
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Previously, the signal mask is always reset when a child process is
started. This breaks tools like `nohup` which expect `SIGHUP` to be
blocked.
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.
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Currently, on macOS, Rust never uses the fast posix_spawn path if a
directory change is requested due to a bug in Apple's libc. However, the
bug is only triggered if the program is a relative path.
This PR makes it so that the fast path continues to work if the program
is an absolute path or a lone filename.
This was an alternative proposed in
https://github.com/rust-lang/rust/pull/80537#issue-776674009, and it
makes a measurable performance difference in some of my code that spawns
thousands of processes.
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fix error handling for pthread_sigmask(3)
Errors from `pthread_sigmask(3)` were handled using `cvt()`, which expects a return value of `-1` on error and uses `errno`.
However, `pthread_sigmask(3)` returns `0` on success and an error number otherwise.
Fix it by replacing `cvt()` with `cvt_nz()`.
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Errors from pthread_sigmask(3) were handled using cvt(), which expects a
return value of -1 on error and uses errno.
However, pthread_sigmask(3) returns 0 on success and an error number
otherwise.
Fix it by replacing cvt() with cvt_nz().
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Also doing fmt inplace as requested.
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