linux 函数学习

1、ioctl

语法：

 #include <sys/ioctl.h>

       int ioctl(int fd, unsigned long op, ...);  /* glibc, BSD */
       int ioctl(int fd, int op, ...);            /* musl, other UNIX */

参数OP的定义：

#ifndef _SYS_IOCTL_H
# error "Never use <bits/ioctls.h> directly; include <sys/ioctl.h> instead."
#endif

/* Use the definitions from the kernel header files.  */
#include <asm/ioctls.h>

/* Routing table calls.  */
#define SIOCADDRT       0x890B          /* add routing table entry      */
#define SIOCDELRT       0x890C          /* delete routing table entry   */
#define SIOCRTMSG       0x890D          /* call to routing system       */

/* Socket configuration controls. */
#define SIOCGIFNAME     0x8910          /* get iface name               */
#define SIOCSIFLINK     0x8911          /* set iface channel            */
#define SIOCGIFCONF     0x8912          /* get iface list               */
#define SIOCGIFFLAGS    0x8913          /* get flags                    */
#define SIOCSIFFLAGS    0x8914          /* set flags                    */
#define SIOCGIFADDR     0x8915          /* get PA address               */
#define SIOCSIFADDR     0x8916          /* set PA address               */
#define SIOCGIFDSTADDR  0x8917          /* get remote PA address        */
#define SIOCSIFDSTADDR  0x8918          /* set remote PA address        */
#define SIOCGIFBRDADDR  0x8919          /* get broadcast PA address     */
#define SIOCSIFBRDADDR  0x891a          /* set broadcast PA address     */
#define SIOCGIFNETMASK  0x891b          /* get network PA mask          */
#define SIOCSIFNETMASK  0x891c          /* set network PA mask          */
#define SIOCGIFMETRIC   0x891d          /* get metric                   */
#define SIOCSIFMETRIC   0x891e          /* set metric                   */
#define SIOCGIFMEM      0x891f          /* get memory address (BSD)     */
#define SIOCSIFMEM      0x8920          /* set memory address (BSD)     */
#define SIOCGIFMTU      0x8921          /* get MTU size                 */
#define SIOCSIFMTU      0x8922          /* set MTU size                 */
#define SIOCSIFNAME     0x8923          /* set interface name           */
#define SIOCSIFHWADDR   0x8924          /* set hardware address         */
#define SIOCGIFENCAP    0x8925          /* get/set encapsulations       */
#define SIOCSIFENCAP    0x8926
#define SIOCGIFHWADDR   0x8927          /* Get hardware address         */
#define SIOCGIFSLAVE    0x8929          /* Driver slaving support       */
#define SIOCSIFSLAVE    0x8930
#define SIOCADDMULTI    0x8931          /* Multicast address lists      */
#define SIOCDELMULTI    0x8932
#define SIOCGIFINDEX    0x8933          /* name -> if_index mapping     */
#define SIOGIFINDEX     SIOCGIFINDEX    /* misprint compatibility :-)   */
#define SIOCSIFPFLAGS   0x8934          /* set/get extended flags set   */
#define SIOCGIFPFLAGS   0x8935
#define SIOCDIFADDR     0x8936          /* delete PA address            */
#define SIOCSIFHWBROADCAST      0x8937  /* set hardware broadcast addr  */
#define SIOCGIFCOUNT    0x8938          /* get number of devices */

#define SIOCGIFBR       0x8940          /* Bridging support             */
#define SIOCSIFBR       0x8941          /* Set bridging options         */

#define SIOCGIFTXQLEN   0x8942          /* Get the tx queue length      */
#define SIOCSIFTXQLEN   0x8943          /* Set the tx queue length      */


/* ARP cache control calls. */
                    /*  0x8950 - 0x8952  * obsolete calls, don't re-use */
#define SIOCDARP        0x8953          /* delete ARP table entry       */
#define SIOCGARP        0x8954          /* get ARP table entry          */
#define SIOCSARP        0x8955          /* set ARP table entry          */

/* RARP cache control calls. */
#define SIOCDRARP       0x8960          /* delete RARP table entry      */
#define SIOCGRARP       0x8961          /* get RARP table entry         */
#define SIOCSRARP       0x8962          /* set RARP table entry         */

/* Driver configuration calls */

#define SIOCGIFMAP      0x8970          /* Get device parameters        */
#define SIOCSIFMAP      0x8971          /* Set device parameters        */

/* DLCI configuration calls */

#define SIOCADDDLCI     0x8980          /* Create new DLCI device       */
#define SIOCDELDLCI     0x8981          /* Delete DLCI device           */

/* Device private ioctl calls.  */

/* These 16 ioctls are available to devices via the do_ioctl() device
   vector.  Each device should include this file and redefine these
   names as their own. Because these are device dependent it is a good
   idea _NOT_ to issue them to random objects and hope.  */

#define SIOCDEVPRIVATE          0x89F0  /* to 89FF */

/*
 *      These 16 ioctl calls are protocol private
 */

#define SIOCPROTOPRIVATE 0x89E0 /* to 89EF */