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AIX Version 4.3 Kernel and Subsystems Technical Reference, Volume 1

fp_ioctl Kernel Service


Issues a control command to an open device or file.


#include <sys/types.h>
#include <sys/errno.h>
int fp_ioctl (fp, cmd, arg, ext)
struct file *fp;
unsigned int cmd;
caddr_t arg;
int ext;


fp Points to a file structure returned by the fp_open or fp_opendev kernel service.
cmd Specifies the specific control command requested.
arg Indicates the data required for the command.
ext Specifies an extension argument required by some device drivers. Its content, form, and use are determined by the individual driver.


The fp_ioctl kernel service is an internal interface to the function provided by the ioctl subroutine.

Execution Environment

The fp_ioctl kernel service can be called from the process environment only.

Return Values

0 Indicates a successful operation.

If an error occurs, one of the values from the /usr/include/sys/errno.h file is returned. The ioctl subroutine contains valid errno values.

Implementation Specifics

The fp_ioctl kernel service is part of Base Operating System (BOS) Runtime.

Related Information

The ioctl subroutine.

Logical File System Kernel Services in AIX Version 4.3 Kernel Extensions and Device Support Programming Concepts.

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