sys_sendmsg       420 include/linux/syscalls.h asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags);
sys_sendmsg       733 net/compat.c   	return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
sys_sendmsg      2191 net/socket.c   		err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);