IOCTL(2) BSD System Calls Manual IOCTL(2)NAME
ioctl -- control device
SYNOPSIS
#include <sys/ioctl.h>
int
ioctl(int d, unsigned long request, char *argp);
DESCRIPTION
The ioctl() function manipulates the underlying device parameters of special files. In particular, many operating characteristics of charac-
ter special files (e.g. terminals) may be controlled with ioctl() requests. The argument d must be an open file descriptor.
An ioctl request has encoded in it whether the argument is an ``in'' parameter or ``out'' parameter, and the size of the argument argp in
bytes. Macros and defines used in specifying an ioctl request are located in the file <sys/ioctl.h>.
RETURN VALUES
If an error has occurred, a value of -1 is returned and errno is set to indicate the error.
ERRORS
Ioctl() will fail if:
[EBADF] d is not a valid descriptor.
[ENOTTY] d is not associated with a character special device.
[ENOTTY] The specified request does not apply to the kind of object that the descriptor d references.
[EINVAL] Request or argp is not valid.
SEE ALSO mt(1), cdio(1), chio(1), execve(2), fcntl(2), tty(4), intro(4)HISTORY
An ioctl() function call appeared in Version 7 AT&T UNIX.
4th Berkeley Distribution December 11, 1993 4th Berkeley Distribution
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IOCTL(2) System Calls Manual IOCTL(2)NAME
ioctl - control device
SYNOPSIS
#include <sys/ioctl.h>
ioctl(d, request, argp)
int d;
unsigned long request;
char *argp;
DESCRIPTION
Ioctl performs a variety of functions on open descriptors. In particular, many operating characteristics of character special files (e.g.
terminals) may be controlled with ioctl requests. The writeups of various devices in section 4 discuss how ioctl applies to them.
An ioctl request has encoded in it whether the argument is an "in" parameter or "out" parameter, and the size of the argument argp in
bytes. Macros and defines used in specifying an ioctl request are located in the file <sys/ioctl.h>.
RETURN VALUE
If an error has occurred, a value of -1 is returned and errno is set to indicate the error.
ERRORS
Ioctl will fail if one or more of the following are true:
[EBADF] D is not a valid descriptor.
[ENOTTY] D is not associated with a character special device.
[ENOTTY] The specified request does not apply to the kind of object that the descriptor d references.
[EINVAL] Request or argp is not valid.
SEE ALSO execve(2), fcntl(2), mt(4), tty(4), intro(4N)4th Berkeley Distribution March 4, 1986 IOCTL(2)
Has anyone over seen this message on bootup? When booting up, I get:
" Warning: lckdioctl: unknown ioctl cmd:5 ".
It scrolls down the screen 5 - 10 times, the I finally get a login. It is also posting to my syslog file. The system came up, but I am still getting the message... (1 Reply)
Hi,
I need to get the console window size for an application, for which I used ioctl() by passing the TIOCGWINSZ parameter. The ioctl() function does not fail (returns non zero), but it could not get the window size (gets 0x0). When I tried to verify the window size by the stty -a command, the... (2 Replies)
Hi All,
I have been trying to use the option -S in sudo for quite some time now but have not been successful. I get the error "Inappropriate ioctl for device" most of the time. Can anyone please tell me how to use this option to pass the password.
Your help is appreciated.
Thanks,
Ambika (2 Replies)
we have a test_script.sh.
This is returning O/S Message: Inappropriate ioctl for device, when set linesize is bigger than 1020, and hence not writing properly to file.
The issue is important, as our initialise feed calls the generate parm file script, which logs on to sql plus to make the... (1 Reply)
When I try to format a slice in Solaris 10 I get the follow error :confused: :
-bash-3.00# mkfs /dev/dsk/c1d0s5 18877824
Can not determine partition size: Inappropriate ioctl for device
Some format command output:....
AVAILABLE DISK SELECTIONS:
0. c1d0 <DEFAULT cyl 38735 alt 2... (0 Replies)
Hello,
I have a cron entry:
59 23 * * * . $HOME/.profile;mydate=`date '+%Y%m%d'`;mv filename filename_$mydate
Which works fine interactively, but gives me the following error when it runs in cron:
Your "cron" job on servername
. $HOME/.profile;mydate=`date '+
produced the... (4 Replies)
When I try to format a slice in Solaris 10 I get the follow error :
-bash-3.00# mkfs /dev/dsk/c1d0s5 18877824
Can not determine partition size: Inappropriate ioctl for device
Some format command output:....
AVAILABLE DISK SELECTIONS:
0. c1d0 <DEFAULT cyl 38735 alt 2 hd 64 sec 63>... (2 Replies)
Does anyone have a list of error codes when core dumps fail?
What is error 4? I also have another box that does error-2 occasionally.
if anyone has a list of these error codes, it would be appreciated, thanks!
I have the error below:
NOTICE: core_log: ns-admin core dump failed,... (2 Replies)
Dear all,
Problem goes like this:
I have a shell script which when run manually runs perfectly.
When same script is executed through a job schdeduler I get an error as Inappropriate ioctl for device and the script fails.
This problems seems quite guiling to me.
Any clues are heartly... (11 Replies)
Greetings,
Please help me with the following :
Where can I find what means exactly and how to use each of the second
argument of the ioctl() system call in Linux/386 : FIOxxx (file IOCTL
requests), SIOxxx (socket IOCTL requests), TCxxx TIOxxx (terminal
IOCTL requests) ?
... (1 Reply)
I was wondering if its possible to read mouse inputs using ioctl functions somehow ? If it is not too much of trouble can anyone write or even direct me to sample code of ioctl reading someother HID. (2 Replies)
Hi All,
int ioctl(int d, int request, ...);
Can somebody tell me how does ioctl decides the input parameter: "request".
Sometimes, its SNDCTL_TMR_TIMEBASE or TCGETS
or FIONREAD...etc.
What is the pattern??
I am asking this coz my strace returns this: ... (1 Reply)
Hi guys,
I am getting the following error in a running process, I got this from the truss command, after this appears, the process just fails.
ioctl(3, TCGETA, 0xFFBFB334) Err#25 ENOTTY
So, my question is, I think that I know what a ENOTTY is, but from the error, how... (1 Reply)
Source
a quick google search making clear that this isn't really new, and if we look at our bsd Forum we see that its the only operation systems forum with the last comment dated to June last year, whereas all the others have more recent comments.
One comment dated to 2014 is exactly what I... (10 Replies)