SOCKETCALL(2) Linux Programmer's Manual SOCKETCALL(2)
socketcall - socket system calls
int socketcall(int call, unsigned long *args);
socketcall() is a common kernel entry point for the socket system
calls. call determines which socket function to invoke. args points
to a block containing the actual arguments, which are passed through to
the appropriate call.
User programs should call the appropriate functions by their usual
names. Only standard library implementors and kernel hackers need to
know about socketcall().
This call is specific to Linux, and should not be used in programs
intended to be portable.
On a some architectures--for example, x86-64 and ARM--there is no sock-
etcall() system call; instead socket(2), accept(2), bind(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 seccomp(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.
accept(2), bind(2), connect(2), getpeername(2), getsockname(2), get-
sockopt(2), listen(2), recv(2), recvfrom(2), recvmsg(2), send(2),
sendmsg(2), sendto(2), setsockopt(2), shutdown(2), socket(2), socket-
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Linux 2015-12-28 SOCKETCALL(2)
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