author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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/** @file ../include/sys/ioccom.h |
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@internalComponent |
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*/ |
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/** @fn ioctl(int aFid, unsigned long aCmd, ...) |
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@param aFid |
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@param aCmd |
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@param ... |
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@return If an error has occurred, a value of -1 is returned and errno is set to indicate the error. |
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@code |
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#include < sys/ioctl.h > |
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@endcode |
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The ioctl system call manipulates the underlying device parameters of special files. |
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In particular, many operating |
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characteristics of character special files (e.g. terminals) |
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may be controlled with ioctl requests. |
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The argument aFid |
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must be an open file descriptor. |
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The third argument to ioctl is traditionally named char *argp . |
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Most uses of ioctl in 3.0, |
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however require the third argument to be a caddr_t |
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or an int. |
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An ioctl request has encoded in it whether the argument is an "in" |
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argument |
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or "out" |
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argument, and the size of the argument argp in bytes. |
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Macros and defines used in specifying an ioctl request are located in the file \#include \<sys/ioctl.h \> |
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Examples: |
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@code |
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/* Detailed description : Sample usage of ioctl system call ,for command SIOCGIFINDEX |
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* which gets socket interface index , by passing socket interface home.*/ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <stdio.h> |
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#include <sys/ioctl.h> |
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int main() |
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{ |
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int ret = 0; |
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struct ifreq ifr; |
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int sockfd; |
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sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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strncpy(ifr.ifr_name, "Ethernet with Daemon Dynamic IP", sizeof(ifr.ifr_name)); |
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if (ioctl(sockfd, SIOCGIFINDEX, 𝔦) != -1) |
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{ |
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ret = -1; |
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} |
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close(sockfd); |
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return ret; } |
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@endcode |
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@see fcntl() |
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@capability Deferred @ref Rsocket::Open |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def _IOR(g,n,t) |
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IO read. |
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@publishedAll |
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@released |
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*/ |
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/** @def _IOW(g,n,t) |
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IO write. |
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@publishedAll |
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@released |
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*/ |
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/** @def _IOWR(g,n,t) |
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IO read write. |
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@publishedAll |
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@released |
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*/ |
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