>Description:
This is a resend or actually a reformatted bug report since the first
one I sent out contained a error on my part (I incorrectly looked at
the mysql_query() return code although I should be looking at
mysql_errno(). Now that is fixed but the problem remains.
If the remote database should become unaccessible (network problems)
it will take mysql_query() 17,5 minutes to timeout. That is a very
long time (especially in the world of IRC) and it should be settable
with mysql_options(). There are some generic TCP options for sockets
that can be used or then the read() should be wrapped in a alarm()
and/or the socket should be made non blockable. Below I have still
included the strace from where things go wrong:
- write() succeeds although it hasn't really (network was filtered at
that point)
- read() gets stuck for 17,5 minutes
20:33:21 fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
20:33:21 read(3, 0x8090d68, 8192) = -1 EAGAIN (Resource temporarily unavailable)
20:33:21 fcntl64(3, F_SETFL, O_RDWR) = 0
20:33:21 write(3, "H\0\0\0\3INSERT INTO oer_output VALU"..., 76) = 76
20:33:21 read(3,
20:33:21 read(3, 0x8090d68, 4) = -1 ETIMEDOUT (Connection timed out)
20:50:55 shutdown(3, 2 /* send and receive */) = -1 ENOTCONN (Transport endpoint is
not connected)
20:50:55 close(3) = 0
>How-To-Repeat:
Start your MySQL program, filter the connection between the remote
database and the server your program is running on.
>Fix:
Implement a timer for network reads/writes, make the socket non
blockable.
>Submitter-Id: <submitter ID>
>Originator:
>Organization:
EQU, programmer of oer+MySQL (a MySQL based IRC bot)
>MySQL support: [none | licence | email support | extended email support ]
>Synopsis: mysql_query() oddities if remote database becomes available
>Severity:
>Priority:
>Category: mysql
>Class:
>Release: mysql-3.23.49 (Source distribution)
>Environment:
System: Linux irc1 2.4.19-pre10 #1 Sat Jun 8 03:00:02 EEST 2002 i686 unknown
Architecture: i686
Some paths: /usr/bin/perl /usr/bin/make /usr/bin/gcc /usr/bin/cc
GCC: Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
gcc version 2.95.4 20011002 (Debian prerelease)
Compilation info: CC='gcc' CFLAGS='' CXX='c++' CXXFLAGS='' LDFLAGS=''
LIBC:
lrwxrwxrwx 1 root root 13 Jun 8 02:24 /lib/libc.so.6 -> libc-2.2.5.so
-rwxr-xr-x 1 root root 1153784 Apr 28 12:57 /lib/libc-2.2.5.so
-rw-r--r-- 1 root root 2390922 Apr 28 12:58 /usr/lib/libc.a
-rw-r--r-- 1 root root 178 Apr 28 12:58 /usr/lib/libc.so
-rw-r--r-- 1 root root 726660 Mar 24 06:56 /usr/lib/libc-client.so.2001
Configure command: ./configure --prefix=/usr --exec-prefix=/usr
--libexecdir=/usr/sbin --datadir=/usr/share --sysconfdir=/etc/mysql
--localstatedir=/var/lib/mysql --includedir=/usr/include --infodir=/usr/share/info
--mandir=/usr/share/man --enable-shared --with-libwrap --enable-assembler
--with-berkeley-db --with-innodb --enable-static --enable-shared --enable-local-infile
--with-raid --enable-thread-safe-client --without-readline
--with-unix-socket-path=/var/run/mysqld/mysqld.sock --with-mysqld-user=mysql
--without-bench --with-client-ldflags=-lstdc++ --with-extra-charsets=all
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