Programming :: Check The Presence Of USB Using /proc Interface In A C Program
Feb 22, 2010
I want to check whether a USB is plugged in its slot from a C program. I want to make use of /proc interface for the same. During my reading i found that /proc/bus/usb/devices will tell how many USB devices are currently present.
So whether i can open this file and use stat call to identify whether the size is 0. If size is 0, i can assume no USB present. Else i can assume USB is present.
Whether my understanding correct. If USB inserted, how can i check the folders present in the USB stick.
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May 1, 2011
I have a kernel module program which is used to create a entry in the proc file system. I have to read and write values in the entry. Its taken from a online tutorial stuff.how to write the value to the proc entry in the program ?
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Sep 24, 2009
Can you please do me favor and let me know how can I check for the presence of inernal (built-in) Bluetooth device on my Linux server ?
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Jun 3, 2011
I am writing a simple C program which has to find whether the system is connected to network/internet or not..
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Jan 11, 2010
Title : Author : Price
France : Mark : 40
Persia : John : 50
how i arranged my database. I am trying to write aprogram which does a search either using Title, Author or both.
[Code]....
but i am still unclear on how i am able to make the program check if either on of the input(either $Title or $Author) is not filled up, and if one of it is not filled up, use the other one which is filled to do a search.
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Apr 20, 2010
in gcc how to read a blank line ie a string of length 0.
my code: Code:
#include<stdio.h>
#include<string.h>
#include<string>
using namespace std;
[Code]....
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Jun 17, 2011
Sed seems to react to the presence of "" in its input if the immediately following character makes the pair a recognizable code. In the code following see that the "a" and "" are missing in the output, and that the "c" caused sed to terminate at that point. Is there any way to prevent it reacting like this?
Code:
g y="the shell built-in command. The following character sequences
> have special meaning:
> a Alert (bell).
> Backspace.
>
> c Suppress trailing newline.
> f Form feed.
>
[Code]....
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May 14, 2011
I need to write script to look for the presence of memory allocation calls without corresponding calls to free the memory
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Feb 22, 2011
I need to record Tx/Rx bw in my c program at defined intervals. I am aware that there a bunch of available tools but I need a minimal version with only Tx/Rx bw with no other details. I have tried the tool bwm-ng which mostly serves my purpose but either it runs continuously in the console or saves result in html file. It does not have any options to save the result in txt file which could have been easy to parse.
Is there any other simple way to record Tx/Rx bw in a program?(without using tools from /proc/net/ or any) I am using Mandriva Linux 2.6.31.5.
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Jul 6, 2010
I've got the F13 LiveCD that I was able to boot and use using the "nomodeset" boot option. From the desktop I'm trying to perform an Install to Hard Drive. I've read the Install from LiveCD post regarding the creation of a /boot partition and a / root partition. I've tried creating them without the LVM group and with. But every time I appempt to install I get...
An error occurred mounting device proc as /proc: mount failed: (9, None). This is a fatal error and the install cannot continue.
Hardware is a Sager 8887 (P4, 3.06HT, 60GB HDD, Radeon 9000 graphics adapter)
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Jul 22, 2010
is there a way to make the /proc filesystem writeable? With aufs or unionfs i can't join the /proc filesystem with a writable directory directly. But i think it should work by using one of this file systems.If i try to join two dirs write-proc and virtual-proc Code: mount -v -t aufs -o dirs=/tmp/write-proc/:/tmp/virtual-proc/ none /tmp/joined-proc/ and afterwards make a bind mount /proc to virtual-proc Code: mount --bind /proc /tmp/virtual-proc/ i can't see any change in /tmp/joined-proc.
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Aug 19, 2010
I want to put check menu & check list in utility dialog.i dont know how i do this
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Dec 22, 2009
I would like to know the command to check the NIC interface in redhat linux.I know ifconfig works, but is there any specific command shows the the interface which in disabled mode too ..
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Dec 6, 2010
I have a requirement, to read the complete proc filesystem from the linux pc.. Does linux provide some functions to read the proc filesystem means the directories and files present in the filesystem.. in short I want to create a treeview of proc filesystem. and if a user selects the file in the proc.. I should show the contents in the respective file. So I want some library or functions to read the proc filesystem..
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Jan 16, 2010
I am trying to run my code repeatedly in a loop about 50 times for timing measurement. I have C code running on ubuntu 8 on a single processor, Intel x86. My code is something like this
Code:
for (loop =0;loop<=50;loop++)
{
// other operations
pDir = opendir("/proc");
while (pDir == NULL)
[Code]...
After about 28-29 times the loop stops executing. I initially had a return -1 if I got pDir == NULL. That caused my program to exit, and I dont want that. Any clues on why this happens, and how I can circumvent this?
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Oct 1, 2010
I'm trying to retrieve a single string or value from /proc/cpuinfo, but when I try to extract the model (not the model name) the model name comes with it, also it likes to print it twice...
Code:
model="`cat /proc/cpuinfo | grep model | cut -d: -f2 | cut -c1-3`"
echo $model
All i want this to do is spit out the model number once. (I need to pass it to another script)
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Dec 8, 2010
I am trying to read the /proc/net/tcp6 file of a huge server (chat server) for monitoring the tcp6 connection states.
My server's tcp6 file has more than 26000 lines. For monitoring the server connections, my monitoring tool has to read the /proc/net/tcp6 file quickly in a regular interval (5 secs) and process. Presently it takes minimum 6-7 seconds for reading the whole file.
My tool can able to read the normal file (26,000 lines) less than 1 second, but it is not possible to read the same size of proc file.
I have 2 questions:
1) Why proc file takes more read time than normal file?
2) Is there any way to read the /proc/net/tcp6 file more quickly?
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Mar 22, 2011
I have not been able to write bash to use a PID file to ensure no other instance of the same script is running! All three methods I can think of to see if the PID in the PID file is another instance of the script make the script exit with a return code of 1 but the same commands run at the command prompt work as expected.
The first attempt was:
Code:
The first attempted workaround was:
Code:
The second attempted workaround (with debug to make the following command prompt copy and paste meaningful) was:
Code:
Here's the command prompt session, testing with a stale PID file and then manually running the problem command and it behaving as expected:
Code:
This on Slackware64 13.1 which has bash 4.1.7.
In desperation I tried rebooting but the behaviour was the same.
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Mar 23, 2010
Is there a way to make a program use a specific network interface ? When using my laptop at work i may be physicaly connected to multiple networks. i was wondering if i can make sure that certain applications use a specific network interface. I would google around for the answer but i cant figure out how to phrase it correctly for a search.
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Apr 18, 2011
I am looking for network backup software with GUI frontend, that can take backup of linux and windows as well.
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Jan 29, 2011
Suppose I have both a hardwired and a wireless network connection active on the same system at the same time. Can I tell my browser which one to use? Can I tell other programs which one to use? Or do they choose for themselves> Or does some automatic system protocol select which one to use for them?
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Jun 17, 2011
Is there any way in a machine with 2 (or more) network devices to only allow 1 program to use interface1 and force all other programs to use the other?
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Sep 6, 2010
I want to check what program is using some ports. I have
Code:
netstat -a | grep localhost
tcp 0 0 localhost:58935 localhost:www ESTABLISHED
tcp6 355 0 localhost:www localhost:58935 ESTABLISHED
udp 0 0 localhost:53888 localhost:53888 ESTABLISHED
I try ps aux | grep 53888. What other command can I use?
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Jul 28, 2011
my server get hanged when ever their is loading problem. i wanna a program to get cpu load and also when load get high from a specified load value it should restart service. is their is any programm or how to write that programm..
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Nov 30, 2009
grub editor program or graphic interface that's in a repository. i would prefer that to having to do say KGRUBeditor from source, plus i dont want to install the kde requirements for it.
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Dec 11, 2010
I am looking for a program with a web interface to show my servers hardware status. hdd usage, cpu load, memory etc.
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Jan 30, 2011
I am looking for a program with a web interface to show my servers hardware status. hdd usage, cpu load, memory etc.
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Feb 9, 2010
I currently doing a network emulator program and the features must includes the web-based interface for user configuration. I able to run my program through command line. But I would like to ask how to associate my program to web-based interface for user configuration?
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Feb 15, 2011
I will have to code this. However I am lacking of time since I have too much to do. make a short code bash/dash to prompt the country with Zenity, then, get the PLS or m3u url and prompt with another zenity which radio to play. http://www.listenlive.eu/index.html
My code to get url's radio country.htm is:
Code:
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May 18, 2011
I'm not talking about like:
apt-get check
I mean it's like, and I thought it was this:
valgrind <application>
Needs:
x
y
z
Does anyone know what I'm talking about? A lot of programs I'm getting segmentation faults like Rhythmbox, a few games, etc. so I dunno.
EDIT: gdb kind of works, but doesn't show me what another program would..
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