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* [BUG] builtin echo doesn't check write error
@ 2021-06-09 14:09 Vincent Lefevre
  2021-06-09 14:17 ` Vincent Lefevre
  2021-06-09 16:13 ` Bart Schaefer
  0 siblings, 2 replies; 10+ messages in thread
From: Vincent Lefevre @ 2021-06-09 14:09 UTC (permalink / raw)
  To: zsh-workers

With zsh 5.8, the builtin echo doesn't check write error.

zira% zsh -c 'echo foo >&-; echo $?'
0

In strace output:

close(1)                                = 0
write(1, "foo\n", 4)                    = -1 EBADF (Bad file descriptor)

No issues with an external echo command:

zira% zsh -c '/bin/echo foo >&-; echo $?'
/bin/echo: write error: Bad file descriptor
1

And with other shells:

zira% sh -c 'echo foo >&-; echo $?'
sh: 1: echo: echo: I/O error
1
zira% bash -c 'echo foo >&-; echo $?'
bash: line 1: echo: write error: Bad file descriptor
1
zira% ksh -c 'echo foo >&-; echo $?'
1
zira% ksh93 -c 'echo foo >&-; echo $?'
1
zira% mksh -c 'echo foo >&-; echo $?'
1
zira% posh -c 'echo foo >&-; echo $?'
1
zira% yash -c 'echo foo >&-; echo $?'
echo: cannot print to the standard output: Bad file descriptor
1

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)


^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2021-06-24  9:07 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-09 14:09 [BUG] builtin echo doesn't check write error Vincent Lefevre
2021-06-09 14:17 ` Vincent Lefevre
2021-06-09 15:33   ` Stephane Chazelas
2021-06-09 15:40     ` Stephane Chazelas
2021-06-09 15:59       ` Stephane Chazelas
2021-06-09 16:13 ` Bart Schaefer
2021-06-09 18:16   ` Stephane Chazelas
2021-06-10  8:11     ` Vincent Lefevre
2021-06-24  8:47     ` Vincent Lefevre
2021-06-24  9:07       ` Vincent Lefevre

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