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Added note on leaving programs running on the background from exec(),

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system() and passthru() without making PHP hang until the execution of the
programs is finished.


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@27978 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Manuel Lemos 2000-07-10 05:15:38 +00:00
parent 7d94d2858f
commit 0a0c8bbbcd
1 changed files with 21 additions and 0 deletions
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21
functions/exec.xml
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@ -89,6 +89,13 @@ system(EscapeShellCmd($cmd))
<function>EscapeShellCmd</function> to make sure that users
cannot trick the system into executing arbitrary commands.
</para>
<para>
Note also that if you start a program using this function and
want to leave it running in the background, you have to make
sure that the output of that program is redirected to a file or
some other output stream or else PHP will hang until the
execution of the program ends.
</para>
<para>
See also <function>system</function>,
<function>PassThru</function>, <function>popen</function>,
@ -130,6 +137,13 @@ system(EscapeShellCmd($cmd))
setting the content-type to <emphasis>image/gif</emphasis> and
then calling a pbmplus program to output a gif, you can create
PHP scripts that output images directly.</para>
<para>
Note that if you start a program using this function and want to
leave it running in the background, you have to make sure that the
output of that program is redirected to a file or some other
output stream or else PHP will hang until the execution of the
program ends.
</para>
<para>
See also <function>exec</function>, <function>system</function>,
<function>popen</function>, <function>EscapeShellCmd</function>,
@ -170,6 +184,13 @@ system(EscapeShellCmd($cmd))
users cannot trick the system into executing arbitrary
commands.
</para>
<para>
Note also that if you start a program using this function and want
to leave it running in the background, you have to make sure that
the output of that program is redirected to a file or some other
output stream or else PHP will hang until the execution of the
program ends.
</para>
<para>
The <function>System</function> call also tries to automatically
flush the web server's output buffer after each line of output if