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]);