Manpage of SOCKETCALL
SOCKETCALLSection: Linux Programmer's Manual (2)
NAMEsocketcall - socket system calls
SYNOPSISint socketcall(int call, unsigned long *args);
DESCRIPTIONsocketcall() is a common kernel entry point for the socket system calls. calldetermines which socket function to invoke. argspoints to a block containing the actual arguments, which are passed through to the appropriate call.
CONFORMING TOThis call is specific to Linux, and should not be used in programs intended to be portable.
NOTESOn a some architectures---for example, x86-64 and ARM---there is no socketcall() 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.
SEE ALSOaccept(2), bind(2), connect(2), getpeername(2), getsockname(2), getsockopt(2), listen(2), recv(2), recvfrom(2), recvmsg(2), send(2), sendmsg(2), sendto(2), setsockopt(2), shutdown(2), socket(2), socketpair(2)
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