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I have a program that compiles with no problems on my Raspberry Pi using gcc that includes the statement:

#include <sys/socket.h>
My intent for this project, though, is to use it on an Arduino. I have installed avr-gcc, avr-LibC, and avrdude, but when I try to compile using:
avr-gcc Project.c -o Project
I receive the error message:
fatal error: sys/socket.h: No such file or directory
I thought socket.h was part of the C standard library. Is it possible to install this library for use by avr-gcc, or is there a way I can point to this library's directory (I have been unable to find it myself in the usual folders, but GCC seems to be able to find it)?  
                Without an operating system, it's meaningless to have socket.h I thought socket.h was part of the C standard library - sys/socket.h is part of posix. to this library's directory but even if you "point" it, there is no operating system to service the syscalls. You would have to write them yourself.
– KamilCuk
                Mar 26, 2020 at 22:42
                Many standard library features are not available in uCs. Forget also about malloc & friends.
– 0___________
                Mar 26, 2020 at 23:23
Can avr-gcc use sys/socket.h?
No. It cannot. That's not a limitation of the compiler though. It's a limitation of the system your code needs to be run on.
The sys/*.h headers are not part of the C standard library. They are only available on POSIX compliant operating systems, and expose C functions to interact with the OS. The sys/socket.h header provides functions to communicate with the operating system to create, manipulate and interact with sockets.
Since sockets are a feature provided by the operating system, and you are compiling code that runs bare-metal on an Arduino microcontroller, which has no operating system running on top, the whole purpose of the sys/socket.h header is nullified.
This applies to any other kind of header or library function that interacts with the operating system, such as unistd.h, fcntl.h, pthread.h etc. In fact, avr-libc, the Standard C library for AVR-GCC, does not provide such headers.
You will need to look at the avr-libc documentation to find out more about the headers and functions that are provided and their usage.
        
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