Re: [PATCH v3 25/25] rte_eal_init: add info about rte_errno codes

On Thu,  9 Feb 2017 09:29:53 -0500
Aaron Conole [off-list ref] wrote:

+ *   The error codes returned via rte_errno:
+ *     EACCES indicates a permissions issue.
+ *
+ *     EAGAIN indicates either a bus or system resource was not available,
+ *            try again.
+ *
+ *     EALREADY indicates that the rte_eal_init function has already been
+ *              called, and cannot be called again.
+ *
+ *     EFAULT indicates the tailq configuration name was not found in
+ *            memory configuration.
+ *
+ *     EINVAL indicates invalid parameters were passed as argv/argc.
+ *
+ *     EIO indicates failure to setup the logging handlers.  This is usually
+ *         caused by an out-of-memory condition.
+ *
+ *     ENODEV indicates memory setup issues.
+ *
+ *     ENOTSUP indicates that the EAL cannot initialize on this system.
+ *
+ *     EUNATCH indicates that the PCI bus is either not present, or is not
+ *             readable by the eal.
  */

You might want to be less restrictive about wording in the comment.
In future more errors might be returned, and also for out of memory
ENOMEM is better.