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linux include files

 
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# 1  
Old 04-16-2011
linux include files
what is the relationship between
/usr/include/sys/*.h
and
/usr/include/unistd.h ?

Fuctions in unistd.h are syscalls. Do the fuctions in sys/*.h call syscalls?
# 2  
Old 04-16-2011
The <unistd.h> header defines miscellaneous symbolic constants and types, and declares miscellaneous functions. See <unistd.h>. I don't think I have ever seen "syscalls" defined in this header nor would I expect to see them defined there.

/usr/include/sys tends to contain platform specific headers rather than general purpose headers.
# 3  
Old 04-16-2011
Aren't write(), read() in unistd.h syscalls?

Why can't socket() in sys/socket.h be seen as a syscall, since it is provieded by OS?
Last edited by vistastar; 04-16-2011 at 03:40 AM..
# 4  
Old 04-16-2011
They are also library calls.
# 5  
Old 04-16-2011
unistd.h is very very old and kind of a grab-bag of stuff.
# 6  
Old 04-17-2011
Why can't socket() in sys/socket.h be seen as a syscall, since it is provieded by OS?
# 7  
Old 04-17-2011
Quote:
Originally Posted by vistastar
Why can't socket() in sys/socket.h be seen as a syscall, since it is provieded by OS?
It can be a system call but isn't always. On some systems it is, or at least used to be, a library.
 
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