Collin Funk <collin.funk1@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Collin Funk <collin.funk1@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.
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From: Collin Funk <collin.funk1@HIDDEN>
To: Code Con Carne via GNU coreutils Bug Reports <bug-coreutils@HIDDEN>
Subject: Re: bug#80010: timeout echo vs. timeout cat
In-Reply-To: <rr-IGIX6ShmWWY6_GCBceaatUe3wZQPwcwxTbxEl-BHeP5_JD2B8coR5RNHFw9cBTopNhcVPwonQCPI_OsQx7UEVqr9CYbXysZZVq5YoFDk=@protonmail.com>
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Date: Sun, 14 Dec 2025 19:08:28 -0800
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Code Con Carne via GNU coreutils Bug Reports <bug-coreutils@HIDDEN>
writes:
> $ timeout 1s echo foo > pipe
>
> expected: times out after 1s
> actual: never times out; ctrl-c to exit
>
> coreutils 9.4-3ubuntu6.1 amd64
In this example, your shell opens "pipe" for writing. There are no
readers, so the shell is blocked. The 'timeout' command is not supposed
to kill the shell, it's parent, so it doesn't.
You can verify this yourself like so:
$ mkfifo pipe
$ timeout 1 echo foo > pipe &
[1] 1483195
In another terminal window, we can see the process is 'bash' and check
what it is doing:
$ ps -p 1483195
PID TTY TIME CMD
1483195 pts/5 00:00:00 bash
$ strace -p 1483195
strace: Process 1483195 attached
openat(AT_FDCWD, "pipe", O_WRONLY|O_CREAT|O_TRUNC, 0666
So it is blocked opening "pipe".
Returning to the original terminal window, we can read from "pipe":
$ cat pipe
foo
[1]+ Done timeout 1 echo foo > pipe
So the shell is unblocked and finishes executing the command.
In the terminal window with 'strace' running, we can see that 'timeout'
isn't invoked until after "pipe" is opened after being unblocked:
$ strace -p 1483195
strace: Process 1483195 attached
openat(AT_FDCWD, "pipe", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
dup2(3, 1) = 1
close(3) = 0
execve("/home/collin/.local/bin/timeout", ["timeout", "1", "echo", "foo"], 0x561e21977ae0 /* 86 vars */) = 0
I agree that this behavior isn't obvious. :)
Collin
bug-coreutils@HIDDEN:bug#80010; Package coreutils.
Full text available.
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From: Collin Funk <collin.funk1@HIDDEN>
To: Code Con Carne via GNU coreutils Bug Reports <bug-coreutils@HIDDEN>
Subject: Re: bug#80010: timeout echo vs. timeout cat
In-Reply-To: <rr-IGIX6ShmWWY6_GCBceaatUe3wZQPwcwxTbxEl-BHeP5_JD2B8coR5RNHFw9cBTopNhcVPwonQCPI_OsQx7UEVqr9CYbXysZZVq5YoFDk=@protonmail.com>
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Content preview: Code Con Carne via GNU coreutils Bug Reports writes: > $
timeout
1s echo foo > pipe > > expected: times out after 1s > actual: never times
out; ctrl-c to exit > > coreutils 9.4-3ubuntu6.1 amd64 In this example, your
shell opens "pipe" for writing. There are no readers, so the shell is blocked.
The 'timeout' command is not supposed to kill the shell, it's parent, so
it doesn't.
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Code Con Carne via GNU coreutils Bug Reports <bug-coreutils@HIDDEN>
writes:
> $ timeout 1s echo foo > pipe
>
> expected: times out after 1s
> actual: never times out; ctrl-c to exit
>
> coreutils 9.4-3ubuntu6.1 amd64
In this example, your shell opens "pipe" for writing. There are no
readers, so the shell is blocked. The 'timeout' command is not supposed
to kill the shell, it's parent, so it doesn't.
You can verify this yourself like so:
$ mkfifo pipe
$ timeout 1 echo foo > pipe &
[1] 1483195
In another terminal window, we can see the process is 'bash' and check
what it is doing:
$ ps -p 1483195
PID TTY TIME CMD
1483195 pts/5 00:00:00 bash
$ strace -p 1483195
strace: Process 1483195 attached
openat(AT_FDCWD, "pipe", O_WRONLY|O_CREAT|O_TRUNC, 0666
So it is blocked opening "pipe".
Returning to the original terminal window, we can read from "pipe":
$ cat pipe
foo
[1]+ Done timeout 1 echo foo > pipe
So the shell is unblocked and finishes executing the command.
In the terminal window with 'strace' running, we can see that 'timeout'
isn't invoked until after "pipe" is opened after being unblocked:
$ strace -p 1483195
strace: Process 1483195 attached
openat(AT_FDCWD, "pipe", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
dup2(3, 1) = 1
close(3) = 0
execve("/home/collin/.local/bin/timeout", ["timeout", "1", "echo", "foo"], 0x561e21977ae0 /* 86 vars */) = 0
I agree that this behavior isn't obvious. :)
Collin
bug-coreutils@HIDDEN:bug#80010; Package coreutils.
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Code Con Carne <codeconcarne@HIDDEN>:bug-coreutils@HIDDEN.
Full text available.bug-coreutils@HIDDEN:bug#80010; Package coreutils.
Full text available.
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