Name

Library

Synopsis

Return values

Detailed description

The third argument to ioctl is traditionally named char *argp. Most uses of ioctl in 3.0, however require the third argument to be a caddr_t or an int.

An ioctl request has encoded in it whether the argument is an "in" argument or "out" argument, and the size of the argument argp in bytes. Macros and defines used in specifying an ioctl request are located in the file

Examples

 /**
  * Detailed description  : Sample usage of ioctl system call ,for command SIOCGIFINDEX which gets socket interface index , by passing socket interface home.
  *
  *
**/
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <sys/ioctl.h>
int main()
{
  int ret = 0;
        struct ifreq ifr;
        int sockfd;
                
        sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);      
        strncpy(ifr.ifr_name, "Ethernet with Daemon Dynamic IP", sizeof(ifr.ifr_name));
        
                if (ioctl(sockfd, SIOCGIFINDEX, 𝔦) != -1)
                {
                ret = -1;
                }
                
        close(sockfd);
        return ret; }

         

Errors

See also

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