ID: 48803
Comment by: andrey dot vihrov at gmail dot com
Reported By: andrey dot vihrov at gmail dot com
Status: Open
Bug Type: Output Control
Operating System: Gentoo Linux amd64
PHP Version: 5.2.10
New Comment:
Hi, thanks for the explanation.
Quite simply errors can occur when writing to any real media (leaving
the terminal aside). For a simple example, consider a PHP script that is
being started with its output being redirected to a file. If the target
filesystem, e. g., runs out of space or encounters an I/O error (like
network fs being disconnected), the script will want to exit
unsuccessfully and, optionally, inform the user about it using STDERR.
If this is not the case, the user will assume things went good, which
does not correspond to reality and may lead to further failures.
The example provided in previous comment is the classical one to check
if software handles I/O errors correctly, so I used it for
demonstration.
Previous Comments:
------------------------------------------------------------------------
[2009-07-05 11:20:37] sjoerd-php at linuxonly dot nl
Thank you for your bug report.
The problem is not that STDERR is affected, but that the script is
terminated immediately. Furthermore, it is not specific for printf.
time php -r 'echo 'a'; sleep(5);' > /dev/full
Expected: real 0m5.030s
Actual: real 0m0.030s
Your contrived example writes to /dev/full, which obviously fails. Do
you have a more real-life example where writing to STDOUT fails?
------------------------------------------------------------------------
[2009-07-05 10:25:31] andrey dot vihrov at gmail dot com
Description:
------------
These functions behave differently if the underlying I/O operation on
STDOUT fails. The difference is that STDERR is affected in one case.
Configure Command => './configure' '--prefix=/usr/lib64/php5'
'--host=x86_64-pc-linux-gnu' '--mandir=/usr/lib64/php5/man'
'--infodir=/usr/lib64/php5/info' '--sysconfdir=/etc'
'--cache-file=./config.cache' '--with-libdir=lib64'
'--with-pcre-regex=/usr' '--enable-cli' '--disable-cgi'
'--with-config-file-path=/etc/php/cli-php5'
'--with-config-file-scan-dir=/etc/php/cli-php5/ext-active'
'--without-pear' '--disable-bcmath' '--with-bz2' '--disable-calendar'
'--disable-ctype' '--without-curl' '--without-curlwrappers'
'--disable-dbase' '--enable-exif' '--without-fbsql' '--without-fdftk'
'--disable-filter' '--disable-ftp' '--with-gettext' '--without-gmp'
'--disable-hash' '--disable-ipv6' '--disable-json'
'--without-kerberos'
'--enable-mbstring' '--with-mcrypt' '--without-mhash' '--without-msql'
'--without-mssql' '--with-ncurses' '--with-openssl'
'--with-openssl-dir=/usr' '--disable-pcntl' '--disable-pdo'
'--without-pgsql' '--disable-posix' '--with-pspell' '--without-recode'
'--disable-simplexml' '--disable-shmop' '--without-snmp'
'--disable-soap' '--disable-sockets' '--without-sybase'
'--without-sybase-ct' '--disable-sysvmsg' '--disable-sysvsem'
'--disable-sysvshm' '--without-tidy' '--disable-tokenizer'
'--disable-wddx' '--disable-xmlreader' '--disable-xmlwriter'
'--without-xmlrpc' '--without-xsl' '--disable-zip' '--with-zlib'
'--disable-debug' '--enable-dba' '--without-cdb' '--with-db4'
'--disable-flatfile' '--with-gdbm' '--disable-inifile'
'--without-qdbm'
'--with-freetype-dir=/usr' '--with-t1lib=/usr' '--disable-gd-jis-conv'
'--with-jpeg-dir=/usr' '--with-png-dir=/usr' '--without-xpm-dir'
'--with-gd' '--without-mysqli' '--with-readline' '--without-libedit'
'--without-mm' '--with-sqlite=/usr' '--enable-sqlite-utf8'
> diff php.ini-dist /etc/php/cli-php5/php.ini
474c474
< ;include_path = ".:/php/includes"
---
> include_path = ".:/usr/share/php5:/usr/share/php"
491c491
< extension_dir = "./"
---
> extension_dir =
/usr/lib64/php5/lib/php/extensions/no-debug-non-zts-20060613
560c560
< allow_url_fopen = On
---
> allow_url_fopen = Off
1283a1284,1288
>
> ; MySQL extensions default connection charset settings
> ;mysql.connect_charset = utf8
> ;mysqli.connect_charset = utf8
> ;pdo_mysql.connect_charset = utf8
Reproduce code:
---------------
Script #1
#! /usr/bin/php
<?
fprintf(STDOUT, "stdout\n");
fprintf(STDERR, "stderr\n");
?>
Testcase #2
#! /usr/bin/php
<?
printf("stdout\n");
fprintf(STDERR, "stderr\n");
?>
Expected result:
----------------
> ./test1.php > /dev/full
stderr
> ./test2.php > /dev/full
stderr
>
Actual result:
--------------
> ./test1.php > /dev/full
stderr
> ./test2.php > /dev/full
>
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=48803&edit=1
