diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/sys/ioctl.2 | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/lib/libc/sys/ioctl.2 b/lib/libc/sys/ioctl.2 index 400fb9f236a..32ef467d437 100644 --- a/lib/libc/sys/ioctl.2 +++ b/lib/libc/sys/ioctl.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: ioctl.2,v 1.6 1999/05/23 14:10:54 aaron Exp $ +.\" $OpenBSD: ioctl.2,v 1.7 1999/05/28 01:51:48 aaron Exp $ .\" $NetBSD: ioctl.2,v 1.5 1995/02/27 12:33:47 cgd Exp $ .\" .\" Copyright (c) 1980, 1991, 1993 @@ -43,7 +43,7 @@ .Sh SYNOPSIS .Fd #include <sys/ioctl.h> .Ft int -.Fn ioctl "int d" "unsigned long request" "char *argp" +.Fn ioctl "int d" "unsigned long request" "..." .Sh DESCRIPTION The .Fn ioctl @@ -53,19 +53,30 @@ characteristics of character special files (e.g. terminals) may be controlled with .Fn ioctl requests. +.Pp The argument .Fa d -must be an open file descriptor. +must be an open file descriptor. The third argument is called +.Fa arg +and contains additional information needed by this device +to perform the requested function. +.Fa arg +is either an +.Fa int +or a pointer to a device-specific data structure, depending upon +the given +.Fa request . .Pp -An ioctl +An +.Nm .Fa request has encoded in it whether the argument is an .Dq in parameter or .Dq out -parameter, and the size of the argument -.Fa argp +parameter, and the size of the third argument +.Pq Fa arg in bytes. Macros and defines used in specifying an ioctl .Fa request |