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To: Code Con Carne <codeconcarne@HIDDEN>
Subject: bug#80010: Acknowledgement (timeout echo vs. timeout cat)
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Message sent to bug-coreutils@HIDDEN:

Subject: bug#80010: timeout echo vs. timeout cat
Resent-From: Collin Funk <collin.funk1@HIDDEN>
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Date: Sun, 14 Dec 2025 19:08:28 -0800
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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

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Subject: bug#80010: timeout echo vs. timeout cat
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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

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From: Collin Funk <collin.funk1@HIDDEN>
To: control <at> debbugs.gnu.org
Subject: 80010 is not a bug
Date: Sun, 14 Dec 2025 19:19:20 -0800
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tags 80010 notabug
close 80010
thanks

Collin

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From: Collin Funk <collin.funk1@HIDDEN>
To: control <at> debbugs.gnu.org
Subject: 80010 is not a bug
Date: Sun, 14 Dec 2025 19:19:20 -0800
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tags 80010 notabug
close 80010
thanks

Collin

Last modified: Mon, 15 Dec 2025 03:30:02 UTC

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