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[2003-01-21 17:50 UTC] syntheticrage at hotmail dot com
I've been writing a CLI-based script that connects to an xml wirefeed and continually reads the data with fgets() and parses it accordingly. The script works fine, but occasionally the feed server goes down for maintenance, etc. That in itself isnt a problem, but when the connection to the feed is lost, fgets() stalls and never times out regardless of the stream_set_timeout() usage. I have written the following scripts to verify the problem (note that the "server" script is only to help test the fgets() bug in the "client" script).
I run this script (the "server" script) on my workstation (running XP w/ PHP 4.3.0 in CLI mode) to listen on a socket:
<?php
error_reporting(E_ALL);
set_time_limit(0);
ob_implicit_flush();
$sock = socket_create (AF_INET, SOCK_STREAM, 0);
socket_bind($sock, "192.168.1.11", "10000");
socket_listen($sock, 5);
$msgsock = socket_accept($sock);
do {
$buf = socket_read($msgsock, 2048);
} while (true);
socket_close($msgsock);
socket_close($sock);
?>
Then I run this script (the "client" script) on my linux box (running RH7.3 w/ PHP 4CVS-2003-01-20 (stable) in CLI mode) to connect to the socket:
<?php
error_reporting(E_ALL);
set_time_limit(30);
ob_implicit_flush();
$fp = fsockopen("192.168.1.10", 10000, $errno, $errstr, 10);
if ($fp) {
stream_set_timeout($fp, 10);
$data = fgets($fp);
$sinfo = socket_get_status($fp);
echo ($sinfo["timed_out"]?"socket timed out\n":"eof\n");
fclose($fp);
} else
echo "unable to connect\n";
?>
The client script will time-out properly when I leave the server script running. But if I run the client script, then CTRL-C my server script, the client script never times out. It sits at the fgets() forever, even though I've set_time_limit(30) as well as stream_set_timeout(10).
Since the script just sits there and never "crashes" to generate a corefile, I haven't been able to perform a backtrace. Even though i've compiled PHP with --enable-debug, killing the script with CTRL-C doesn't generate a corefile (should it?). If a bt would help, please let me know how I can generate a corefile with the CLI version of PHP.
I've configured PHP as as follows:
'./configure' '--with-apxs' '--with-config-file-path=/etc' '--with-mysql=/usr' '--with-gzip' '--with-xml' '--with-gd' '--with-zlib' '--with-freetype' '--with-ttf' '--enable-debug'
Note that I have also verified this problem on a second linux box running RH8 w/ PHP4.3.0.
Any help would be appreciated!
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Last updated: Sat Dec 21 15:01:29 2024 UTC |
I was using 4.3.0 on the machine running the "server" test script (but since that script is merely to aid in testing the bug in the "client" script, I didnt think it mattered). The machine running the "client" script - the one experiencing the bug - was running a stable snapshot compiled last night. Nontheless, I just re-compiled with the latest stable today, ran again, and managed to generate a bt in the process: #0 0x420e19ee in select () from /lib/i686/libc.so.6 #1 0x08204844 in __DTOR_END__ () #2 0x08147689 in _php_stream_free (stream=0x82598fc, close_options=3) at /usr/local/src/php4-STABLE-200301220030/main/streams.c:327 #3 0x080c4f85 in zif_fclose (ht=1, return_value=0x8256f2c, this_ptr=0x0, return_value_used=0) at /usr/local/src/php4-STABLE-200301220030/ext/standard/file.c:1120 #4 0x08185c8b in execute (op_array=0x8254ac4) at /usr/local/src/php4-STABLE-200301220030/Zend/zend_execute.c:1596 #5 0x08173dcc in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/local/src/php4-STABLE-200301220030/Zend/zend.c:864 #6 0x0813c983 in php_execute_script (primary_file=0xbffffb10) at /usr/local/src/php4-STABLE-200301220030/main/main.c:1573 #7 0x0818c0a2 in main (argc=2, argv=0xbffffbb4) at /usr/local/src/php4-STABLE-200301220030/sapi/cli/php_cli.c:753 #8 0x42017589 in __libc_start_main () from /lib/i686/libc.so.6 Hope it helps :)(gdb) frame 2 #2 0x08147689 in _php_stream_free (stream=0x82598fc, close_options=3) at /usr/local/src/php4-STABLE-200301220030/main/streams.c:327 327 ret = stream->ops->close(stream, preserve_handle ? 0 : 1 TSRMLS_CC); (gdb) print *stream $2 = {ops = 0x81ee5c0, abstract = 0x824f46c, filterhead = 0x0, filtertail = 0x0, wrapper = 0x0, wrapperthis = 0x0, wrapperdata = 0x0, fgetss_state = 0, is_persistent = 0, mode = "r+", '\0' <repeats 13 times>, rsrc_id = 4, in_free = 1, fclose_stdiocast = 0, stdiocast = 0x0, __exposed = 1, __orig_path = 0x0, context = 0x0, flags = 16, position = 0, readbuf = 0x8254b9c "", readbuflen = 8192, readpos = 0, writepos = 0, chunk_size = 8192, eof = 1}My script still stalls. Here's a new bt: #0 0x420d3b2e in select () from /lib/i686/libc.so.6 #1 0x081a077c in __JCR_LIST__ () #2 0x0811482b in _php_stream_free (stream=0xbfffb940, close_options=3) at /usr/local/src/php4-STABLE-200302141830/main/streams.c:327 #3 0x080b95ee in zif_fclose (ht=1, return_value=0x81f4514, this_ptr=0x0, return_value_used=0) at /usr/local/src/php4-STABLE-200302141830/ext/standard/file.c:1120 #4 0x0813dc5a in execute (op_array=0x81ef52c) at /usr/local/src/php4-STABLE-200302141830/Zend/zend_execute.c:1596 #5 0x08131595 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/local/src/php4-STABLE-200302141830/Zend/zend.c:864 #6 0x0810c79c in php_execute_script (primary_file=0xbfffe1f0) at /usr/local/src/php4-STABLE-200302141830/main/main.c:1582 #7 0x0814255f in main (argc=2, argv=0xbfffe274) at /usr/local/src/php4-STABLE-200302141830/sapi/cli/php_cli.c:753 #8 0x420158d4 in __libc_start_main () from /lib/i686/libc.so.6 (gdb) frame 2 #2 0x0811482b in _php_stream_free (stream=0xbfffb940, close_options=3) at /usr/local/src/php4-STABLE-200302141830/main/streams.c:327 327 ret = stream->ops->close(stream, preserve_handle ? 0 : 1 TSRMLS_CC); (gdb) print *stream $1 = {ops = 0x10, abstract = 0x0, filterhead = 0x0, filtertail = 0x0, wrapper = 0x0, wrapperthis = 0x0, wrapperdata = 0x0, fgetss_state = 0, is_persistent = 0, mode = '\0' <repeats 15 times>, rsrc_id = 0, in_free = 0, fclose_stdiocast = 0, stdiocast = 0x0, context = 0x0, flags = 0, position = 0, readbuf = 0x0, readbuflen = 0, readpos = 0, writepos = 0, chunk_size = 0, eof = 0}