where is socket header in linux
In case you have installed manual pages, the first stop should be man socket.
Without manual pages you could call
find /usr/include -name socket.h
which outputs
/usr/include/asm/socket.h
/usr/include/sys/socket.h
/usr/include/bits/socket.h
/usr/include/linux/socket.h
on my system, the one to include is sys/socket.h .
Also see the Single UNIX Specification.
sys/socket.h is not found for gcc arm x86_64-aarch64 cross compiling
As user253751 and Ian Abbott answered in comments, there are no header files because there is no operating system which defines "socket" entity.
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