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12435 Discussions

gdb "unable to bind" also "you can't do that when your target is `exec'" hassles

Altera_Forum
Honored Contributor II
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I submitted service request 11001074 today concerning the following issue. 

 

To Altera: 

 

When coding the nios2-gdb-server please be mindful of pittfall number three described at the following URL.  

 

http://www.ibm.com/developerworks/library/l-sockpit/ 

 

Since this isnt done in nios2-gdb-server then the software developer is constanty receiving the "unable to bind" error message from nios2-gdb-server unless he uses a new port every time that the nios2-gdb-server is started. Using a new port each time makes it very difficult to configure gdb to use the same port as nios2-gdb-server in the IDE.  

 

/media/hill/aux0/altera-install/13.0sp1/nios2eds/bin/nios2-gdb-server -C -r --tcpport 6001 

Unable to bind (98) 

 

We receive this error message because the ip port-address tuple stays in ip kernel wait state for NNN minutes after nios2-gdb-server exits unless the SO_REUSEADDR option is set. 

 

Not being able to reuse the same port number is a huge hastle for the software developer if he is using the debugger restart to restart the target. I restart the target frequently when I am debugging. 

 

Yes, there is also the "--tcppersist" option for nios2-gdb-server, but this requires starting nios2-gdb-server in a separate window. We prefer to start nios2-gdb-server from the IDE when launching gdb so that another step isnt required. The "--tcppersist" option isnt very appealing because we must restart the nios2-gdb-server every time that the target is powered back on which is often because the fan is very loud.
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