1 .\" $OpenBSD: ioctl.2,v 1.11 2001/07/30 01:12:43 deraadt Exp $
2 .\" $NetBSD: ioctl.2,v 1.5 1995/02/27 12:33:47 cgd Exp $
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35 .\" @(#)ioctl.2 8.2 (Berkeley) 12/11/93
44 .Fd #include <sys/ioctl.h>
46 .Fn ioctl "int d" "unsigned long request" "..."
50 function manipulates the underlying device parameters of special files.
51 In particular, many operating
52 characteristics of character special files (e.g., terminals)
53 may be controlled with
59 must be an open file descriptor. The third argument is called
61 and contains additional information needed by this device
62 to perform the requested function.
66 or a pointer to a device-specific data structure, depending upon
73 has encoded in it whether the argument is an
78 parameter, and the size of the third argument
81 Macros and defines used in specifying an ioctl
83 are located in the file
84 .Ao Pa sys/ioctl.h Ac .
86 If an error has occurred, a value of \-1 is returned and
88 is set to indicate the error.
95 is not a valid descriptor.
98 is not associated with a character
101 The specified request does not apply to the kind
102 of object that the descriptor
112 points outside the process's allocated address space.
125 function call appeared in