[PLUG] system call in php
Richard Steffens
rsteff at attbi.com
Fri May 17 15:41:04 UTC 2002
Wil Cooley wrote:
> Try instead:
>
> system("sh -c \"/usr/bin/mpg123 $fileList &\"") ;
>
> The background '&' is a shell operation and the PHP system call might or
> might not exec a shell.
Didn't make any difference.
Rob Hudson wrote:
> Look at the difference between:
> http://www.php.net/system
> http://www.php.net/exec
>
> I think exec doesn't wait for a response unless you pass it an array,
> but you still need to redirect output to a file (/dev/null?) so PHP
> knows it's not supposed to wait. The '&' is good in that it kicks up a
> child process.
exec worked the same way as system. However, while reading the info at
php.net I came across this note.
Note: 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.
I included redirection in my system call and got what I was looking for.
system("/usr/bin/mpg123 1>outputfile 2>errorfile $fileList &");
Thanks for the suggestion of where to look.
--
Regards,
Dick Steffens
"Quando Omni Flunkus Moritati"
http://rsteff.home.attbi.com/
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