socketcall - socket system calls
int socketcall(int call, unsigned long
() is a common kernel entry point for the socket system calls.
determines which socket function to invoke. args
a block containing the actual arguments, which are passed through to the
User programs should call the appropriate functions by their usual names. Only
standard library implementors and kernel hackers need to know about
This call is specific to Linux, and should not be used in programs intended to
On a some architectures—for example, x86-64 and ARM—there is no
() system call; instead socket
(2), and so on really are implemented as separate system calls.
On x86-32, socketcall
() was historically the only entry point for the
sockets API. However, starting in Linux 4.3, direct system calls are provided
on x86-32 for the sockets API. This facilitates the creation of
(2) filters that filter sockets system calls (for new user-space
binaries that are compiled to use the new entry points) and also provides a
(very) small performance improvement.