tag	line	file	source code
sendmsg	129	include/linux/net.h	int   (*sendmsg)  (struct socket *sock, struct msghdr *m, int total_len, int nonblock, int flags);
sendmsg	1123	net/socket.c	if(sock->ops->sendmsg==NULL)
sendmsg	1125	net/socket.c	return sock->ops->sendmsg(sock, &msg_sys, total_len, (file->f_flags&O_NONBLOCK), flags);