[nanomsg] nn_sendmsg man page vs. source code
- From: Boszormenyi Zoltan <zboszor@xxxxx>
- To: nanomsg@xxxxxxxxxxxxx
- Date: Tue, 24 Sep 2013 10:36:03 +0200
Hi,
I am reading the source of nanomsg and found some a little inconsistency.
in nn_sendmsg()
from the man page.
1. Return value.
"Otherwise, negative number is returned and errno is set..."
The negative number is -1 in every case. It would be nice to says that
explicitly.
2. Behaviour regarding the pre-allocated message buffer:
"Alternatively, to send a buffer allocated by nn_allocmsg(3) function
set iov_base to point to the pointer to the buffer and iov_len to NN_MSG
constant.
The buffer will be deallocated by nn_send function. Trying to deallocate it
afterwards
will result in undefined behaviour. Also, scatter array in nn_msghdr structure
can contain only one element in this case."
The message buffer is *not* deallocated in case an error is returned early.
The values of errno where it's not deallocated are: EINVAL, EMSGSIZE, EFAULT.
These error values are not even documented in the man page.
Best regards,
Zoltán Böszörményi
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