UDP Socket

Hello!

I am using eclipse to develop IoT. I wanted to test UDP socket to connnect our own equipment.

Now, I have a problem in this line.

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recvfrom(socket_handle,UdpRcvMsg,sizeof(UdpRcvMsg),0,(struct sockaddr *)&sin,(socklen_t*)&sin_len);

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The error message is :

The prototype of recvfrom is:

I baidu this question(I cann't use google in China). it means "size_t" is Invalid.

To solve this problem, I tried:

step 1

add <stddef.h> into this project.   --- not work

add <cstddef> into this project.   --- not work

step 2

Properties for Project -->c/c++ General --> Preprocessor inculde Paths...-->Providers-->"check CDT GCC Built-in Compiler Settings"     --- not work

I hope that someone can help me.

Best regards!

Hello,

I have the same kind of problem :

I try to test this code (without the thread part, only the memory sharing)  : https://software.intel.com/en-us/blogs/2014/09/22/efficient-communication-between-arduino-and-linux-native-processes

I have an error on the line :

p_mmapData =static_cast<structmmapData*>(mmap(NULL,sizeof(structmmapData), PROT_READ | PROT_WRITE, MAP_SHARED, fd_mmapFile, 0));

It is apparently the second parameter that cause problem :sizeof(structmmapData).

If I check for the Index and search for unresolved include on my project, I get this :Unresolved inclusion: stddef.h

There is one stddef.h in sysroots\i586-nlp-32-poky-linux\usr\lib\gcc\i586-poky-linux\5.3.0\include with code in it (13K)

there is another one in sysroots\i586-nlp-32-poky-linux\usr\include\linux but it is empty (1K), there is just a line feed.

Any idea how to fix it ?

I tried the same code with the Intel System Studio IOT edition and don't have any problem, the code compile and run as expected.

It must be missing a path in the IOT2000 Eclipse IDE, not sure how to add it and where .

I have it working by adding : "${POKY_HOME}/usr/lib/gcc/i586-poky-linux/5.3.0/include" in 

properties->c/c++Build->settings->tools settings->iot2000 c++ compiler