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* [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE.
@ 2022-08-08 17:32 carlos at redhat dot com
2022-08-08 17:33 ` [Bug stdio/29459] " carlos at redhat dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: carlos at redhat dot com @ 2022-08-08 17:32 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=29459
Bug ID: 29459
Summary: fwrite does not return EPIPE when underlying write
fails with EPIPE.
Product: glibc
Version: 2.36
Status: NEW
Severity: normal
Priority: P2
Component: stdio
Assignee: unassigned at sourceware dot org
Reporter: carlos at redhat dot com
Target Milestone: ---
This was reported downstream for CentOS 9 Stream here:
https://bugzilla.redhat.com/show_bug.cgi?id=2112672
The issue is an upstream issue that needs review.
The test case is attached from the downstream issue.
An strace shows the issue clearly:
1659979752.806415 write(1, "hello\n", 6) = 6
1659979752.806467 write(2, "1. fwrite wrote 6 bytes and ferror is 0\n", 40) =
40
1659979752.806517 write(1, "hello\n", 6) = -1 EPIPE (Broken pipe)
1659979752.806548 --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER,
si_pid=202616, si_uid=1000} ---
1659979752.806563 write(2, "2. fwrite wrote 6 bytes and ferror is 1\n", 40) =
40
The underlying write fails with EPIPE, but fwrite doesn't itself fail.
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* [Bug stdio/29459] fwrite does not return EPIPE when underlying write fails with EPIPE.
2022-08-08 17:32 [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE carlos at redhat dot com
@ 2022-08-08 17:33 ` carlos at redhat dot com
2022-08-08 17:33 ` carlos at redhat dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: carlos at redhat dot com @ 2022-08-08 17:33 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=29459
Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://bugzilla.redhat.com
| |/show_bug.cgi?id=2112672
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* [Bug stdio/29459] fwrite does not return EPIPE when underlying write fails with EPIPE.
2022-08-08 17:32 [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE carlos at redhat dot com
2022-08-08 17:33 ` [Bug stdio/29459] " carlos at redhat dot com
@ 2022-08-08 17:33 ` carlos at redhat dot com
2022-08-08 17:35 ` carlos at redhat dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: carlos at redhat dot com @ 2022-08-08 17:33 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=29459
--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
Created attachment 14264
--> https://sourceware.org/bugzilla/attachment.cgi?id=14264&action=edit
test-fwrite.c
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* [Bug stdio/29459] fwrite does not return EPIPE when underlying write fails with EPIPE.
2022-08-08 17:32 [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE carlos at redhat dot com
2022-08-08 17:33 ` [Bug stdio/29459] " carlos at redhat dot com
2022-08-08 17:33 ` carlos at redhat dot com
@ 2022-08-08 17:35 ` carlos at redhat dot com
2022-08-08 17:50 ` schwab@linux-m68k.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: carlos at redhat dot com @ 2022-08-08 17:35 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=29459
--- Comment #2 from Carlos O'Donell <carlos at redhat dot com> ---
POSIX says it shall fail with EPIPE:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/fputc.html#
"An attempt is made to write to a pipe or FIFO that is not open for reading by
any process. A SIGPIPE signal shall also be sent to the thread."
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* [Bug stdio/29459] fwrite does not return EPIPE when underlying write fails with EPIPE.
2022-08-08 17:32 [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE carlos at redhat dot com
` (2 preceding siblings ...)
2022-08-08 17:35 ` carlos at redhat dot com
@ 2022-08-08 17:50 ` schwab@linux-m68k.org
2022-08-08 19:19 ` carlos at redhat dot com
2022-08-08 19:57 ` sam at gentoo dot org
5 siblings, 0 replies; 7+ messages in thread
From: schwab@linux-m68k.org @ 2022-08-08 17:50 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=29459
--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
How exactly is the test program called?
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* [Bug stdio/29459] fwrite does not return EPIPE when underlying write fails with EPIPE.
2022-08-08 17:32 [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE carlos at redhat dot com
` (3 preceding siblings ...)
2022-08-08 17:50 ` schwab@linux-m68k.org
@ 2022-08-08 19:19 ` carlos at redhat dot com
2022-08-08 19:57 ` sam at gentoo dot org
5 siblings, 0 replies; 7+ messages in thread
From: carlos at redhat dot com @ 2022-08-08 19:19 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=29459
--- Comment #4 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Andreas Schwab from comment #3)
> How exactly is the test program called?
./fwrite -l hello 5000 | head -n1
Such that head terminates and closes the pipe after reading one line.
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* [Bug stdio/29459] fwrite does not return EPIPE when underlying write fails with EPIPE.
2022-08-08 17:32 [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE carlos at redhat dot com
` (4 preceding siblings ...)
2022-08-08 19:19 ` carlos at redhat dot com
@ 2022-08-08 19:57 ` sam at gentoo dot org
5 siblings, 0 replies; 7+ messages in thread
From: sam at gentoo dot org @ 2022-08-08 19:57 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=29459
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sam at gentoo dot org
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2022-08-08 17:32 [Bug stdio/29459] New: fwrite does not return EPIPE when underlying write fails with EPIPE carlos at redhat dot com
2022-08-08 17:33 ` [Bug stdio/29459] " carlos at redhat dot com
2022-08-08 17:33 ` carlos at redhat dot com
2022-08-08 17:35 ` carlos at redhat dot com
2022-08-08 17:50 ` schwab@linux-m68k.org
2022-08-08 19:19 ` carlos at redhat dot com
2022-08-08 19:57 ` sam at gentoo dot org
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