socketcall2
Socket system calls
Usage
#include <linux/net.h> /* Definition of SYS_* constants */ #include <sys/syscall.h> /* Definition of SYS_socketcall */ #include <unistd.h>
int syscall(SYS_socketcall, int call, unsigned long *args);
Note: glibc provides no wrapper for socketcall(), necessitating the use of syscall(2).
Library
Standard C library (libc, -lc)
Overview
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().
| call | Man page |
| SYS_SOCKET | socket(2) |
| SYS_BIND | bind(2) |
| SYS_CONNECT | connect(2) |
| SYS_LISTEN | listen(2) |
| SYS_ACCEPT | accept(2) |
| SYS_GETSOCKNAME | getsockname(2) |
| SYS_GETPEERNAME | getpeername(2) |
| SYS_SOCKETPAIR | socketpair(2) |
| SYS_SEND | send(2) |
| SYS_RECV | recv(2) |
| SYS_SENDTO | sendto(2) |
| SYS_RECVFROM | recvfrom(2) |
| SYS_SHUTDOWN | shutdown(2) |
| SYS_SETSOCKOPT | setsockopt(2) |
| SYS_GETSOCKOPT | getsockopt(2) |
| SYS_SENDMSG | sendmsg(2) |
| SYS_RECVMSG | recvmsg(2) |
| SYS_ACCEPT4 | accept4(2) |
| SYS_RECVMMSG | recvmmsg(2) |
| SYS_SENDMMSG | sendmmsg(2) |
Versions
On 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.
Releases
19 releases since Debian 1.1 (Buzz); the text changed 14 times.