int socketcall(int call, unsigned long *args);
ユーザープログラムは通常の名前を使用して適切な関数を呼び出すべきである。 標準ライブラリの実装者やカーネルハッカーのみが socketcall() について知る必要がある。
| call | マニュアル |
| 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) |
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.