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Full Discussion: ioctl()
Top Forums Programming ioctl() Post 17398 by developer on Thursday 14th of March 2002 12:59:11 PM
Old 03-14-2002
Briefly the ioctl function is called with three arguments. The first is a file descriptor, a socket in the case of network programming. The second argument is the request, e.g. what you want to do, there are many of them like SIOCGIFADDR which returns to you the protocol address assigned to your interface. The third argument is a pointer and it depends of the request, for instance if you want to get interface configuration parameters the pointer is of struct ifconf type. You can check the manual page of ioctl_list so as to get a list of the available requests.
The problem is that ioctl is not the same for all unix like os, it may vary. Last week I was trying to configure a proxy arp server with ioctl but the damn thing was not working properly. I posted a mail to the linux kernel mailing list but anfortunately nobody answered.
Last edited by developer; 03-18-2002 at 08:05 AM..
 

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LEARN ABOUT MOJAVE

ioctl

IOCTL(2)						      BSD System Calls Manual							  IOCTL(2)

NAME

     ioctl -- control device

SYNOPSIS

     #include <sys/ioctl.h>

     int
     ioctl(int fildes, unsigned long request, ...);

DESCRIPTION

     The ioctl() function manipulates the underlying device parameters of special files.  In particular, many operating characteristics of charac-
     ter special files (e.g. terminals) may be controlled with ioctl() requests.  The argument fildes must be an open file descriptor.

     An  ioctl request has encoded in it whether the argument is an ``in'' parameter or ``out'' parameter, and the size of the argument argp in
     bytes.  Macros and defines used in specifying an ioctl request are located in the file <sys/ioctl.h>.

RETURN VALUES

     If an error has occurred, a value of -1 is returned and errno is set to indicate the error.

ERRORS

     ioctl() will fail if:

     [EBADF]		fildes is not a valid descriptor.

     [EINVAL]		Request or argp is not valid.

     [ENOTTY]		fildes is not associated with a character special device.

     [ENOTTY]		The specified request does not apply to the kind of object that the descriptor fildes references.

SEE ALSO

     cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)

HISTORY

     An ioctl() function call appeared in Version 7 AT&T UNIX.

4th Berkeley Distribution					 December 11, 1993					 4th Berkeley Distribution
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