一.内核原型(linux2.6.28-7) long (*compat_ioctl)(struct tty_struct *tty, struct file * file,                      unsigned int cmd, unsigned long arg);      implement ioctl processing for 32 bit process on 64 bit system      Optional 二.What is compat_ioctl

每次出错的都是和posix相关先把结论说了: fn_ofd_w和fn_ofd_r的SAFE_FCNTL参数F_OFD_SETLKW fn_posix_w和fn_posix_r的SAFE_FCNTL参数F_SETLKW 四个函数都用的flock64结构体 case F_SETLK: case F_SETLKW: err = get_compat_flock(&flock, compat_ptr(arg)); case F_SETLK64: case F_SETLKW64: case F_OFD_S

参考: https://www.cnblogs.com/super119/archive/2012/12/03/2799967.html https://lwn.net/Articles/119652/ http://b8807053.pixnet.net/blog/post/3610561-ioctl%2cunlocked_ioctl%e5%92%8ccompat_ioctl Linux内核中struct file_operations含有下面两个函数指针: struct file_opera

关键词: 1. socket基础 一个典型的客户端/服务器场景中,应用程序使用socket进行通信的方式如下: 各个应用程序创建一个socket.socket是一个允许通信的设备,两个应用程序都需要用到它. 服务器将自己的socket绑定到一个众所周知的地址上是的客户端能够定位到它的位置. 关键socket API包括以下下几种: socketr()创建一个新的socket. bind()将一个socket绑定到一个地址上.通常服务器需要使用这个调用来将其socket绑定到一个众所周知的地址上使

// SPDX-License-Identifier: GPL-2.0 /* * sys_ipc() is the old de-multiplexer for the SysV IPC calls. * * This is really horribly ugly, and new architectures should just wire up * the individual syscalls instead. */ #include <linux/unistd.h> #include

// SPDX-License-Identifier: GPL-2.0 /* * linux/ipc/shm.c * Copyright (C) 1992, 1993 Krishna Balasubramanian * Many improvements/fixes by Bruno Haible. * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994. * Fixed the shm swap deallocati

// SPDX-License-Identifier: GPL-2.0 /* * linux/ipc/sem.c * Copyright (C) 1992 Krishna Balasubramanian * Copyright (C) 1995 Eric Schenk, Bruno Haible * * /proc/sysvipc/sem support (c) 1999 Dragos Acostachioaie <dragos@iname.com> * * SMP-threaded, sys

// SPDX-License-Identifier: GPL-2.0 /* * linux/ipc/msg.c * Copyright (C) 1992 Krishna Balasubramanian * * Removed all the remaining kerneld mess * Catch the -EFAULT stuff properly * Use GFP_KERNEL for messages as in 1.2 * Fixed up the unchecked user

队列的意思应该大家都清楚,不过还有有一些细节的地方不知道,下面是一个队列的源码,因该说这是队列的一部分,不是全部.而且是linux中队列,其他各种OS中队列大同小异. /* * POSIX message queues filesystem for Linux. * * Copyright (C) 2003,2004 Krzysztof Benedyczak (golbi@mat.uni.torun.pl) * Michal Wronski (michal.wronski@gmail.com)