How to set Non-blocking UDP socket?

RE: How to set Non-blocking UDP socket?

Yusuke — Thu, 15 Aug 2019 08:41:53 GMT

Thank you! Please let me know when it's fixed.

RE: How to set Non-blocking UDP socket?

Håkon Alseth — Thu, 15 Aug 2019 07:24:23 GMT

Hi,

There's something strange here. bind() returns this errno when using newlib c:

https://github.com/eblot/newlib/blob/master/newlib/libc/machine/cris/sys/errno.h#L153

when I tried using minimal c (zephyr libc), it returns EINPROGRESS.

Other calls seems to be returning the expected errno when its non blocking, but bind should not return that errno per the "man bind" documentation.

I've reported this internally, and asked about this behavior.

Kind regards,

Håkon

RE: How to set Non-blocking UDP socket?

Yusuke — Wed, 14 Aug 2019 13:05:16 GMT

Hi, Hakon. Thank you for helping me many times.

> Have you updated to the latest v1.0.0 tag, as described in this post?

Yes, I use v1.0.0

> What happens if you run the ntp example without setting fcntl()?

It works fine. This is output.

SPM: NS image at 0xc000
SPM: NS MSP at 0x20024578
SPM: NS reset vector at 0x1306d
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS v1.14.99-ncs2 *****
getaddrinfo err: 0
client_fd: 3
bind err: 0
sendto ret: 48
Flags: 36
Stratum: 2
Poll: 3
Precision: 4294967272
Root delay: 1728249856
Root dispersion: 2114125824
Ref ID: 4027000512
Ref timestamp: 37747758182192391172
Orig Timestamp: 00
Receive timestamp: 37747763311848377896
Transmit: 37747763311848543134
Unix time: 1565787531
Time: Wed Aug 14 12:58:51 2019

this post says this.

so basically the socket opening function works fine, but somehow the fcntl doesn't recognize just opened socket descriptor. The program goes all the way down to the recvfrom function and the bind/send functions work fine with the same socket:

In my case, fcntl apparently works out, but bind and connect functions cause error.

RE: How to set Non-blocking UDP socket?

Håkon Alseth — Tue, 13 Aug 2019 13:45:12 GMT

Hi,

Have you updated to the latest v1.0.0 tag, as described in this post?

What happens if you run the ntp example without setting fcntl()?

Kind regards,

Håkon