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32 .\" @(#)ioctl.2 8.2 (Berkeley) 12/11/93
34 .\" $FreeBSD: src/lib/libc/sys/ioctl.2,v 1.7.2.7 2001/12/14 18:34:01 ru Exp $
35 .\" $DragonFly: src/lib/libc/sys/ioctl.2,v 1.4 2008/11/10 23:47:31 swildner Exp $
48 .Fn ioctl "int d" "unsigned long request" ...
52 system call manipulates the underlying device parameters of special files.
53 In particular, many operating
54 characteristics of character special files (e.g.\& terminals)
55 may be controlled with
60 must be an open file descriptor.
64 is traditionally named
68 however, require the third argument to be a
76 has encoded in it whether the argument is an
80 argument, and the size of the argument
83 Macros and defines used in specifying an ioctl
85 are located in the file
88 If an error has occurred, a value of -1 is returned and
90 is set to indicate the error.
97 is not a valid descriptor.
100 is not associated with a character
103 The specified request does not apply to the kind
104 of object that the descriptor
114 points outside the process's allocated address space.
125 function call appeared in