Bug #72256 [Opn]: echo statement on invalid fd cause php to abort
Edit report at https://bugs.php.net/bug.php?id=72256&edit=1
ID: 72256
Updated by: cmb@php.net
Reported by: prinbra at gmail dot com
Summary: echo statement on invalid fd cause php to abort
Status: Open
Type: Bug
Package: *General Issues
PHP Version: Irrelevant
-Assigned To:
+Assigned To: cmb
Block user comment: N
Private report: N
New Comment:
Behavior confirmed: <https://3v4l.org/sJeMB>.
Interestingly, running the script on a debug version of PHP,
won't exhibit this behavior. Instead, I get:
hello, world
bool(true)
hello, world2
hello, world2 in stderr
> the fail of fprintf does not cause php to quit? why echo is so
> special and so fragile?
To begin with, fprintf() explicitly requests the resource, and
notices that it has been closed, so it doesn't actually try to
write anything to stdout (the warning goes to stderr by default).
Previous Comments:
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[2016-05-27 05:13:00] prinbra at gmail dot com
er, my point isï¼ may be the php process shouldn't quit if echo failed.
the fail of fprintf does not cause php to quit? why echo is so special and so fragile?
example:
fprintf.php
<?php
fprintf(STDOUT, "hello, world\n");
fclose(STDOUT);
fprintf(STDOUT, "hello, world2\n");
fprintf(STDERR, "hello, world2 in stderr\n");
output:
hello, world
PHP Warning: fprintf(): 2 is not a valid stream resource in /tmp/t.php on line 4
hello, world2 in stder
however, if change fprintf to echo, php will quit early.
------------------------------------------------------------------------
[2016-05-25 20:46:27] ab@php.net
Thanks for the report. When user is logged out, the whole session becomes invalid. This should be
solvable by using nohup or running PHP in screen/tmux.
Thanks.
------------------------------------------------------------------------
[2016-05-23 07:32:10] prinbra at gmail dot com
Description:
------------
on cli environment, when the stdout of php becomes unavailable, eg: user run php in background and
logged out of their ssh connection.
a echo statement will cause php process to exit immediately!
strace output:
14937 12:22:18.958295 write(1, "running\n", 8) = -1 EIO (Input/output error)
then php just silently quit!
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