note 101263 modified in function.file-get-contents by danbrown
| From: | danbrown@php.net | Date: | Mon, 06 Dec 2010 17:57:48 +0000 |
| Subject: | note 101263 modified in function.file-get-contents by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-174663@lists.php.net to get a copy of this message | ||
If working file is bigger than 64kb and you getting deadlock. Your buffer is overflow. Here are two
way how to avoid that.
1) use temporary file for descriptor
<?php
$descriptorspec = array(
0 => array("file", "/tmp/ens/a.ens","r"), // stdin is a pipe
that the child will read from
1 => array("file", "/tmp/ens/a.html","w"), // stdout is a pipe
that the child will write to
2 => array("file", "/tmp/ens/error-output.txt", "a") // stderr
is a file to write to
);
?>
2) inline read using stream_set_blocking. PHP doesn't proper handle last part of file.
<?php
$READ_LEN = 64*1024;
$MAX_BUF_LEN = 2*$READ_LEN;
$url = "http://some.domain.com:5984/".$db."/".$member."/contents";
$src = fopen($url,"r");
$cwd = '/tmp';
$cmd['enscript'] = "/usr/bin/enscript";
$cmd['enscript-options'] = " -q --language=html --color -Ejcl -o -";
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read
from
1 => array("pipe", "w") // stdout is a pipe that the child will write
to
);
$ph=proc_open($cmd['enscript']."
".$cmd['enscript-options'],$descriptorspec,$pipes,$cwd);
stream_set_blocking($src,0);
stream_set_blocking($pipes[0],0);
stream_set_blocking($pipes[1],0);
$CMD_OUT_OPEN = TRUE; $k = 0;
while (!feof($pipes[1]) || !feof($src) || $k > 0) {
if (!feof($src) && $k+$READ_LEN <= $MAX_BUF_LEN) {
$input .= fread($src,$READ_LEN);
$k = strlen($input);
}
if ($k > 0) {
$l = fwrite($pipes[0],$input);
$k -= $l;
$input = substr($input,$l);
}
if ($CMD_OUT_OPEN && $k == 0 && feof($src)) {
fclose($pipes[0]);
$CMD_OUT_OPEN = FALSE;
}
$output = fread($pipes[1],$READ_LEN);
$outputn = str_replace("<H1>(stdin)</H1>","",$output);
echo $outputn;
}
fclose($pipes[1]);
$return_value = proc_close($ph);
?>
--was--
If working file is bigger than 64kb and you getting deadlock. Your buffer is overflow. Here are two
way how to avoid that.
1) use temporary file for descriptor
<?
$descriptorspec = array(
0 => array("file", "/tmp/ens/a.ens","r"), // stdin is a pipe
that the child will read from
1 => array("file", "/tmp/ens/a.html","w"), // stdout is a pipe
that the child will write to
2 => array("file", "/tmp/ens/error-output.txt", "a") // stderr
is a file to write to
);
?>
2) inline read using stream_set_blocking. PHP doesn't proper handle last part of file.
<?
$READ_LEN = 64*1024;
$MAX_BUF_LEN = 2*$READ_LEN;
$url = "http://some.domain.com:5984/".$db."/".$member."/contents";
$src = fopen($url,"r");
$cwd = '/tmp';
$cmd['enscript'] = "/usr/bin/enscript";
$cmd['enscript-options'] = " -q --language=html --color -Ejcl -o -";
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read
from
1 => array("pipe", "w") // stdout is a pipe that the child will write
to
);
$ph=proc_open($cmd['enscript']."
".$cmd['enscript-options'],$descriptorspec,$pipes,$cwd);
stream_set_blocking($src,0);
stream_set_blocking($pipes[0],0);
stream_set_blocking($pipes[1],0);
$CMD_OUT_OPEN = TRUE; $k = 0;
while (!feof($pipes[1]) || !feof($src) || $k > 0) {
if (!feof($src) && $k+$READ_LEN <= $MAX_BUF_LEN) {
$input .= fread($src,$READ_LEN);
$k = strlen($input);
}
if ($k > 0) {
$l = fwrite($pipes[0],$input);
$k -= $l;
$input = substr($input,$l);
}
if ($CMD_OUT_OPEN && $k == 0 && feof($src)) {
fclose($pipes[0]);
$CMD_OUT_OPEN = FALSE;
}
$output = fread($pipes[1],$READ_LEN);
$outputn = str_replace("<H1>(stdin)</H1>","",$output);
echo $outputn;
}
fclose($pipes[1]);
$return_value = proc_close($ph);
?>
http://php.net/manual/en/function.file-get-contents.php