[etherlab-users] ecrt_slave_config_reg_pdo_entry() returns "No such file or directory"

Gary Grobe ggrobe at houstonmechatronics.com
Tue Sep 10 01:24:28 CEST 2019


I'm working a new userspace app with etherlab and have managed to 
discover slaves and configure PDO's and am now at the point of doing 
mass registrations of PDO's.

In domain.c is the ecrt_domain_reg_pdo_entry_list() function which 
iterates through an array of ec_pdo_entry_reg_t's. As it iterates 
through the array, the call stack is roughly ...

     ecrt_domain_reg_pdo_entry_list()
         ecrt_master_slave_config()
             ec_master_add_slave_config()
         ecrt_slave_config_reg_pdo_entry()
             ioctl()

The first of seven ec_pdo_entry_reg_t objects in the array was 
successful. However, on the second iteration of the input array, the 
result (errno) from the call to ioctl() in 
ecrt_slave_config_reg_pdo_entry() of slave_config.c is failing with "No 
such file or directory".

I've triple checked the inputs which appear to be correct, but recall 
reading somewhere's that there may be checks to the capabilities of 
ioctl() calls handling a device which I'm not clear on. I was hoping 
someone might be able to comment or explain if this is the case or have 
other ideas as to what might be going on?

The exact message is:
     "Failed to register PDO entry: No such file or directory"




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