[unixODBC-dev] RHEL 5 Linux UnixODBC/Freetds

Prasanna Srinivasan psriniboise at gmail.com
Fri Apr 12 02:37:26 BST 2013

Am trying to move my compiled C code that connects to mssql database
servers from using the datadirect odbc drivers to using the unixodbc
driver manager (version 2.3.1)/ freetds drivers (version 0.91) which
are already compiled for 64 bit and available to me.

Am able to successfully compile it on 64 bit RHEL5 Linux by linking in
libodbc which has already been compiled. But I get the error
net.c:350: tds_select: Assertion 'timeout_seconds >= 0' failed
multiple times when I run the code and the database connection fails.

The environment variables I set are ODBCINI, ODBCHOME and
LDD_LIBRARY_PATH (which is set to the libraries in the unixodbc path).
The driver in the odbcinst file is set to the path where libtdsodbc.so
is located.
 The permissions on the odbc.ini, odbcinst.ini files appear to be fine.

I also tried linking in libodbinst and libtdsodbc (by including and
not including libodbc)  when compiling and set the FREETDSCONF
environment variable as well to the freetds.conf location. But I keep
getting the same error, "net.c:350: tds_select: Assertion
'timeout_seconds >= 0' '. My code connects to the database
occasionally, but for most of the part it errors.

The timeout from the freetds.conf file appears to be correct:
   # Command and connection timeouts
;       timeout = 10
;       connect timeout = 10

When I do an ldd on my executable, the dependencies are:

libodbcinst.so.2 =>
libtdsodbc.so.0 =>
 libnsl.so.1 =>
 libc.so.6 =>
 libdl.so.2 =>
 libpthread.so.0 =>
 librt.so.1 =>

Am I missing something here.

Thanks for your help.

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