Programming :: Ioctl TIOCMGET Call Doesn't Detect TIOCM_CTS
Apr 6, 2011
I am having the following problem. The following code works fine on my P.C. Ubuntu x64, and on a jetway mini-itx board with an atom processor. The problem is, the same code doesn't work on the intel equivalent of the jetway board. I thought the maybe, I didn't have the port configured right, so I turned on Hardware Flow control and also tried turning on the modem bits I needed with TIOCMBIS. Neither worked. Here is the code. There are two threads, one of them, respsponding to the client, and using the RTS and DTR pins to power two relays. The other, manages listening to CTS and DSR for input. Here is the class with the first thread.
Code:
/*
* DigitalIOCore.cpp
*
* Created on: Nov 1, 2010
* Author: jonathan
[code]....
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Jul 4, 2011
I want to modify ioctl TIOCMWAIT to return the same thing that ioctl TIOCMGET returns. Currently wait returns an int of zero or -1 when a change in status occurs. Why not make it return the new status?
This will make the operation faster by not requiring another call to ioctl.The extra call requires 2 to 16 uSeconds to complete on my x64 laptop. How would I make this proposal to the kernal people?
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Feb 12, 2010
Hi I am trying to add the device by using followig code strip and it says that eth1 is not defind in the code.
strncpy(ifr.ifr_name,eth1,IFNAMSIZ);
if (ioctl(sd, SIOCGIFINDEX, &ifr) == -1) {
return 0;
}
How do I write down the DEVICE name in the ifr.ifr_name structure ?
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Apr 8, 2010
I have a kernel function device_ioctl(). How do I define it in file_operations?
1. struct file_operations memory_fops = {
ioctl:device_ioctl
};
2. struct file_operations memory_fops = {
.ioctl=device_ioctl
};
3. struct file_operations memory_fops = {
device_ioctl
};
which one is the right one?
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Jul 22, 2011
Please send me the code how to assign ipv6 address using ioctl system call using C.
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Sep 23, 2009
i wanted to capture the stdout and stdin of a child process within a parent so that any output of child is sent to the parent and any input taken from the parent. code is simple enough and i have followed all code guidlines on the internet (some guidlines do differ also) my select call either hangs if i do not give a tmeout and with a timeout it returns 0 descriptors to be written to or read from:
below is the simple code for parent:
int main(void)
{
int outfd[2];
int infd[2];
[code].....
why select hangs without a timeout ... why can it not detect that the pipe is write ready i.e parent can write to it ... if it does not detect tha read pipe as having data...
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Feb 28, 2011
I was trying to get the ssid of WLAN through the following C program
What is the cause of this error?
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Jul 21, 2010
I'm creating a usb device driver that needs to be able to read from two different endpoints. I couldn't see any way of having two read functions in the driver, so I got round this by reading from one of the endpoints with read, and the other with ioctl.However this hasn't worked, the ioctl call from c returns -1. I added a printk command in the driver in the ioctl function, however looking at kern.log I can see that this function is never being called. Does anyone have any ideas as to what the problem called be, or a better method of being able to read from two different endpoints?
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Jan 18, 2011
I just want to read and write some values (integer) to my driver. I used put/get user but always getting errors.
driver
Quote:
int Wert;
static int device_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsinged long arg)
int ret;
[code]...
Quote:
int WERT
ret=ioctl(fd, SETIT, WERT)
ret=ioctl(fd, GETIT, WERT)
if i say in C++ WERT is 5 the value arg of the driver becomes 5 but not WERT the returnvalue of get and put user is -1 so it failed.
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Jul 1, 2010
I use ioctl to get the console window size (the SSH window). I use the following code:
struct winsize ws;
int returnValue = ioctl(pCommandStructure->terminal, TIOCGWINSZ, &ws);
int numberOfColumnsOfTerminalWindow = ws.ws_col;
When I debug on linux pc, it gives me the correct window width. But after I try it on router (this is my enventual place where my code shall run), ioctl always give me 0 width, that is, numberOfColumnsOfTerminalWindow == 0. but the returnValue is 0 which means that the function call succeeds.
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Jul 1, 2010
I use ioctl to get the cosole window size (the SSH window).
I use the following code:
When I debug on linux pc, it gives me the correct window width. But after I try it on router (this is my enventual place where my code shall run), ioctl always give me 0 width, that is, numberOfColumnsOfTerminalWindow == 0. but the returnValue is 0 which means that the function call succeeds.
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Jan 19, 2011
Cairo-Dock corrupts on suspend resume.My problem is that cairo-dock gets corrupted after I resume from suspend. I've tried to solve this problem but can't find anything more than others suffering from the same dilemma. So I came to conclusion that the easiest way ist to restart cairo-dock. I now have made the working scripts to shut it off and to start it but now the trash applet and home -directory applet won't workIt says :warning : (/build/buildd/cairo-dock-plug-ins-2.2.0~4/shortcuts/src/applet-.c:cd_shortcuts_list_drives:306) and same for rest apps.I am exporting $HOME variable and I have made sure $HOME works so I don't understand. The problem seems to be cairo-dock can't be started with su -m USER -c "exec /home/USER/ohjelmointi/shell/cairo-dock-on.sh &"it just doesn't know how to load something for the applets. But otherwise the settings load fine
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Aug 20, 2010
I am looking for a way to make a video call from windows to linux. I do prefer over MSN or skype protocol so it would mean less trouble starting new accounts for all sides.
Now here are my problems: pidgin doesn't support video calls on msn protocol and skype doesn't support video calls over GPRS.
I like the simple looking interface on pidgin and I have a sierra wireless 880E pcmcia 3G modem. the windows side is using the WLM so no problems there.
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Feb 23, 2009
I was wondering if there was a way to add a switch to a gcc/g++ call everytime. I have a few libraries that I need to compile for different processors. Each has a makefile which calls gcc to compile. Here is the best option I could come up with so far:Include a Makefile and define CC as gcc -mcpu=xxx.
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Jan 8, 2010
i have only basic knowledge of C so guys plz help me...is C language support call the C executable inside the C ?example contect mainA.c have a many function define in the struct,when i compile mainA and make a executable the name is ( A ),can i use executable C inside the C <my C program call the executable ( A ) > .
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Apr 3, 2011
in below program why was new_args[0], rather than the reference the_cmd, passed to the execvp system call?
Code:
/*
A _very_ limited shell program
[code]....
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Jun 1, 2010
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Sep 29, 2010
There are examples everywhere about calling f77 subroutine from IDL, but I have not found any material about IDL calling fortran written in f90 way(free style). I tried the following example, but write the subroutines in free style. When I run the makefile, it gives an error 'undefined reference to main_'.
Code:
SUBROUTINE SUM_ARRAY(argc, argv) !Called by IDL
INTEGER*4 argc, argv(*) !Argc and Argv are integers
j = LOC(argc) !Obtains the number of arguments (argc)
[code]....
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Feb 24, 2010
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Nov 29, 2010
In practice I have a script that call a java program that call a linux system command. The script if I run it, from a shell functions well,so it is not a java problem. The problem come out when i put this script in a crontab schedulation. The result in this case is that java do not execute the system command. I think it depends on crontab
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Oct 8, 2010
I am facing issue in my OPENSSL code. I have written openssl client. It sends request to the host and receives response for that request.
My problem is, it connects, sends request successfully to host at first time only in sencond attempt it fails on SSL_write(). where SSL_get_error() returns SSL_ERROR_SYSCALL error.
In that ERR_get_error() returns 0. man page shows "If ret == 0, an EOF was observed that violates the protocol".
Code Snippet.
w=SSL_write(SSLRequestData.ssl,c2s,c2sl);
switch(SSL_get_error(SSLRequestData.ssl,w))
{
case SSL_ERROR_NONE:
if(c2sl!=w)
[Code]....
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Dec 8, 2010
I have a process that forks, where the childs puts some data of random size and exits while the parent should get the data and does some manipulation.. here I have used a pipe for child to write the data and parent to read the data.. Child simply dumps the data, and the data is of any size even child and parent doesnt know.
I have used select in the parent to see whether there is any data coming on the reading end of the pipe.. if there is a data.. I copy into a buffer.. Im reading the data continusly when the child exits after closing the writing end of pipe. Parent gets blocked on the read part But my question is how parent know the other of pipe is closed when using the select call. In otherwords.. while using select in readfds, how would i know the other end has closed the pipe..
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Sep 18, 2010
I am trying to figure out how i would go about finding out where system call is made and error checking is not done. I have code below, if somebody can point me in the right direction where system call is made but error checking is not done.Quote:
#include "shell.h"
#include <stdio.h>
#include <string.h>
[code]....
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Sep 4, 2010
i used ldap for authentication.now i have a perl script that users use it for login(contact.pl),then this script calls a shell script(ip.sh) for create iptables chain.
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May 24, 2011
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Jul 20, 2011
I have a script which takes an array as an input to the file.ex: test.ksh -l <array_value>
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I store the value I get in l in varaible myLvalue.Now indise my Script I want to run a for loop for thevalue I get in -l.If I write the for loop as below. I'm getting value x.However I'm expecting the loop to run for a and b.
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Aug 30, 2010
I successfully added a new system call in CentOS Kernel but I don't know where to view it! My kernel version is -2.6.32.5
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Mar 24, 2011
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Apr 9, 2011
My little 40 GiBs hdd is kind of small by current standards. When I start running out of space, I always wondered what else I could do with those hundreds of music videos? Put 'em on dvd!
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Jul 16, 2011
what will i do? so that i can install ubuntu on that partition?
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