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.
The fp_ioctl kernel service can be called from the process environment only.
| 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.
The fp_ioctl kernel service is part of Base Operating System (BOS) Runtime.
The ioctl subroutine.
Logical File System Kernel Services in AIX Version 4.3 Kernel Extensions and Device Support Programming Concepts.