ID: 46917 User updated by: jost_boekemeier at users dot sf dot net Reported By: jost_boekemeier at users dot sf dot net -Status: Feedback +Status: Open Bug Type: Streams related Operating System: * PHP Version: 5.2.8 New Comment:
Due to its nature (uninitialized variable) you may or may not be able to reproduce this bug. See http://sourceforge.net/mailarchive/forum.php?thread_name=828E3F73B78941EAB5AF3E2E07C37D8D%40IBM1020C944423&forum_name=php-java-bridge-users for details. However, you should immediately see the bug by looking at the PHP source code: 0 == recv(sock->socket, &buf, sizeof(buf), MSG_PEEK does NOT set errno (the result code is 0, not -1) so that errno contains a bogus value, most likely the error code from a previously failed sys call, so that php_socket_errno() != EAGAIN fails, depending on the application's PHP code, as errno sometimes contains EAGAIN (from a previous poll()). Just search the PHP sources for the pattern } else if (php_pollfd_for(sock->socket, PHP_POLLREADABLE|POLLPRI, &tv) > 0) { if (0 == recv(sock->socket, &buf, sizeof(buf), MSG_PEEK) && php_socket_errno() != EAGAIN) { alive = 0; } and set the errno or the lastErrorCode (for windows) to zero before calling this pattern. After that persistent sockets, soap and a few other places will work reliably. There are a few caveats, however. First, if you pass the last error number to application-level, you might have to restore the last errno immediately after the recv call. Second, I don't know what the php_socket_errno() != EAGAIN should do, anyway, as EAGAIN is only set when the previous sys call failed (result code -1, not 0!). So I suggest to ask the author to explain his/her code before fixing anything. Regards, Jost Bökemeier Previous Comments: ------------------------------------------------------------------------ [2008-12-24 19:48:34] fel...@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. ------------------------------------------------------------------------ [2008-12-21 16:07:15] jost_boekemeier at users dot sf dot net The relevant part of the bug trace was missing. poll([{fd=16, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 1 ([{fd=16, revents=POLLIN}]) recv(16, ""..., 1, MSG_PEEK) = 0 send(16, "PUT /JavaBridge/JavaBridge.phpjavabridge HTTP/1.1\r\nHost: localhost\r\nContent-Length: 40\r\nX_JAVABRIDGE_CHANNEL: /dev/shm/.php_java_bridgexN2WsO\r\n\r\n\177C<H p=\"1\" v=\"php.java.bridge.Util\"></H>"..., 185, 0) = 185 poll([{fd=16, events=POLLIN|POLLERR|POLLHUP}], 1, -1) = 1 ([{fd=16, revents=POLLIN|POLLERR|POLLHUP}]) recv(16, ""..., 8192, 0) = 0 ------------------------------------------------------------------------ [2008-12-21 16:03:05] jost_boekemeier at users dot sf dot net Description: ------------ PHP cannot handle broken socket connections due to an uninitialized variable. xp_socket.c and several other places contain the following pattern: ... } else if (php_pollfd_for(sock->socket, PHP_POLLREADABLE|POLLPRI, &tv) > 0) { if (0 == recv(sock->socket, &buf, sizeof(buf), MSG_PEEK) && php_socket_errno() != EAGAIN) { alive = 0; } ... It is obvious that the above code cannot work on any operating system; checking if the socket doesn't have an error and then asking for its error code is simply nonsense. The same pattern is used in several other places within PHP. The above code fails constantly on Windows. On Linux/Unix a workaround is to add the constant 1E512 to the PHP script, which initializes errno with a value != EAGAIN. Regards, Jost Bökemeier Reproduce code: --------------- pfsockopen() ... // restart back end ... pfsockopen() => Expected result: ---------------- ... poll([{fd=16, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 0) = 1 ([{fd=16, revents=POLLIN}]) recv(16, ""..., 1, MSG_PEEK) = 0 close(16) ... Actual result: -------------- ... poll([{fd=16, events=POLLIN|POLLERR|POLLHUP}], 1, -1) = 1 ([{fd=16, revents=POLLIN|POLLERR|POLLHUP}]) recv(16, ""..., 8192, 0) = 0 gettimeofday({1229844164, 46391}, NULL) = 0 write(2, "[Sun Dec 21 08:22:44 2008] [error] [client 127.0.0.1] PHP Notice: Undefined index: content_length in ... ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=46917&edit=1
