Programming :: Get Process Statistics From Kernel And Return Them Buf?

Apr 7, 2011

I am want get next information: Get process statistics from kernel and return them buf as

Quote:

number of processes : ticks_user : ticks_system : ticks_interrupt : cpuseconds : procsizes : resident segment sizes I am find some this information in /proc/[pid]/stat, but there are is not data about ticks system, ticks_interrupt, cpusecond. Where I am can find it information???

I am write on C, better if it will file witch information, and not programm.

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Programming :: Pthread_create Does Not Return The PID ( Process ID)?

Aug 5, 2010

I am using pthread_create system call to create a thread. However pthread_create does not return the PID ( process ID). Is there any quick way to fınd the PID of the created thread.

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Programming :: Can Expect Return Control Of A Spawned Process To A Shell Script

Nov 19, 2009

Is it possible to have an Expect script spawn an SSH session, log in, then go into interactive mode and give control of the SSH session to a Bash script? Here's a simplified example of the script so far:

Code:
#!/bin/bash
expect -c "

[code]....

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OpenSUSE Network :: Strange Ifconfig Statistics For Eth0 With 2.6.37.2-1-desktop Kernel?

Feb 28, 2011

The computer and system in question is the laptop from my description and openSUSE 11.3 with a different kernel from this repository :[URL]..free to move this thread if it should reside in the beta/prerelease forums section. The IMHO relevant information about my hardware and system is shown below.

The kernel I'm using :

Code:
grzes@opensuse:~> Linux opensuse.local 2.6.37.2-1-desktop #1 SMP PREEMPT 2011-02-25 19:59:41 +0100 i686 i686 i386 GNU/Linux
The hardware and drivers I'm using :
Code:
02:00.0 Network controller [0280]: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)

[Code]...

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Programming :: Kernel Module "read()" Return Value?

Apr 6, 2010

I wrote a character device driver for an Embedded Linux build (Kernel Revision 2.6.17.1) running on ARM9. In the module's "read()" function, I'm returning the number of bytes that were copied into the user buffer. I saw some module code samples online and in most cases the "read()" function is returning the number of bytes read.The very strange behavior I saw in my case was, if I use a variable to return the value from the module's "read()" function, the user application reading from the module always saw "0".For instance:

Code:
static int zlg7289_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{

[code]....

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Programming :: Allocate A Cpu Core For Kernel Process?

Aug 3, 2010

My system has Intel Xeon 4-core cpu(hyperthreading 8-core) and run 64-bit linux. I want to allocate one core for general process(kernel process & other processes). And then, I want to allocate the rest of core for the specific multi-thread program.

Q1: I know that I can pthread_setaffinity() for user-mode thread and mpstat for monitoring. So, how can I allocate a core for kernel process and monitor it?

Q2: How can I restrict use of the cores for the multi-thread program? I don't want kernel process to use the cores for the multi-thread program.

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Programming :: Make A (user Space )process Pre Emptive / In 2.6 Kernel?

Dec 10, 2008

I am writing a program which i dont want the kernel scheduler to preempt before certain time duration. I am using the system call sched_get_priority_max to set the maximum priority. However it is not producing results.

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General :: Could Not Receive Return Value From Daemon Process?

Mar 17, 2011

each time my linux is booting, it check something like eth0 and something else. but there is something i write below that fail... Code: could not receive return value from daemon proccess?

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General :: Init.d Process Does Not Return To Prompt?

Jul 9, 2010

I have a script in /etc/rc.d/init.d named foo. I want to start/stop/restart my process as follows:$ foo start But I do not see the [OK] message once it starts. There is no shell prompt returned either. It seems that my own process is the problem. The executable that foo calls is built from this sample code:

int main()
{
do {
printf("Hello world
");
sleep(1);
} while (1);
}

Do I have to return some kind of signal handle for this to work?

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General :: Fork() Always Return 0 Even In The Parent Process?

Mar 18, 2011

my code is very simple:

int pid, status;
printf("parent process id=%d, to call fork
",getpid());
if(pid=fork()<0)

[Code].....

but everytime I can only get two fork return pid=0. In parent process, the pid returned by fork() should be >0 and equal to the child process id.

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Programming :: Implement A System Call For Displaying The System Statistics

Nov 6, 2010

I have been assigned to implement a system call that report the system statistics over all memory which are

Total Pages in Active LRU list
Total Pages in Inactive LRU List

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Programming :: Termios Programming - Without Removing Carriage Return / Enter Key

Jun 30, 2010

I trying to write a UART(interfacing of serial devices) to linux machine but after I execute the following code to receive data I need to enter key (carriage return).... but I don't want to remove carriage return/enter key

[Code]....

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Slackware :: Kernel Hang During Boot Process - Slack 13.1 Stable W/ Kernel 2.6.33.4-smp

Jun 20, 2010

I installed a fresh copy of Slackware 13.1 (stable) on one of my media servers and I am experiencing something strange.... When I power up the machine, I see the kernel booting, no errors, until it gets to the point where it says:

And then randomly freeze there.... Well the machine is not totally frozen because the cursor still blinks. But it will never continue... Like I said, this happens on a random basis... After a reset, it might go through or simply stall at the same spot.

I remember after installing Slack 13.1, I rebooted the machine but forgot to remove the DVD from the player, so the install routine started up, and froze at the same point when it was loading the kernel for the setup programs...

My mobo is a MSI k9N platinum.

I never had this problem before.... (well I never used 13.1 before). Since I got this machine, I used slack 12.2 and slack 13-current with success.

This problem makes the machine extremely unreliable because I intent to use it as a backup and media server, so chances I will WOL the machine and use it remotely... if that happens.

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Programming :: Displaying Process Id In Shell Script But There Is No Such Process?

Nov 9, 2010

I have a shell script to identify whether the process is running or not. If the process is not running, then I execute another script file to run my application. Below is my script and saved this script as monitorprocess.sh Code: #!/bin/bash

result=$(ps -ef | grep -v grep | grep "applicationname.sh" | awk '{print $2}')
echo $result
if [ "$result" == "" ];

[code]...

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Programming :: Difference Between Init.rc Process And Normal Process?

Mar 31, 2011

Is there any difference in cpu usage for process in init.rc(runs automatic when boot is happened) and manually running process. Will these both have same priority by default...?

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Programming ::get The PID Of The Process Giving Kill Signal To A Process?

Nov 26, 2008

I tried googling but didn't get any answer for this.I have a process called "abc" and it is running with PID "123".I have a putty session opened with PID "999".I am giving kill -TERM 123 from putty session.My process "abc" before dying it should catch the PID of the terminal which provided TERM signal to it.Is there any way to find this out

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Programming :: Else &amp; Return Values?

Oct 12, 2010

i am having two small issues with a function i have made.sorry if it is a mess, i am still learning bash.the first is calling the nonpersistssh function (second line) and assigning the return value to nonpersistdiag.the function returns 1, but nonpersistdiag seems to only contain 0. i am unsure on how to proceed.the second problem is the nested else clause on line 10. it is a syntactical error. how would i declare it correctly?

Code: function endsession(){
nonpersistdiag=$[nonpersistssh]# a function that returns an exit code
sudo /etc/init.d/ssh stop; sshdiag=$?

[code]....

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Programming :: Return And Exit In C

Jun 3, 2011

What are the uses of return 0, return 1 and exit statements in C

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Programming :: Return Value From A Function?

Nov 15, 2010

On this link [URL]4 a return type is defined

Code:
return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG);
What is the above function returning.I am not clear with definition of what is being returned in the above code.

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Programming :: What Exactly Does Echo $0 Return

Jan 18, 2010

I'm confused about what "echo $0" in a shell actually return. Consider these tests:

Code:
[root@e11apvl151 ~]# # Login shell:
[root@e11apvl151 ~]# echo $0
-bash
[root@e11apvl151 ~]# # Starting a new shell
[root@e11apvl151 ~]# bash
[root@e11apvl151 ~]# echo $0
bash
[root@e11apvl151 ~]# screen
[root@e11apvl151 ~]# echo $0
/bin/bash

Depending on wether the shell is a login shell, a regular shell, or a screen utility, I get different results.

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Programming :: Tell If Grep Didn't Return Anything?

Mar 15, 2011

I have a file:

979798707
787862348
766428634

I want to see if all the records in the file are present in the contents of the files of a particular directory.

Basically I want to say if grep doesn't return anything, then report.

For example in /tmp dir I have 4 files and flast 2 values (787862348 and 766428634) are present in the files of /tmp dir, but first one (979798707) is not. I want to echo that in a reporting file.

something like:

while read line
do
# if ! grep -rl $line /tmp
echo $line >> are_not_present
done < "myFile"

How do I achieve " if ! grep -rl $line /tmp"? That is, if the line is found by grep, then grep will print the output, but if grep does'nt find it, it will print nothing. How can I check if grep didn't find it (i.e. printed nothing)?

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Programming :: C - Return To The Beginning Of A File?

Dec 16, 2010

I'm reading a text file with fscanf using a loop until feof(inFile). How can I return to the top of the file? As in I have one loop that scans until the eof and then after it there's another loop and I want to start from the beginning of the file again scanning to the end of it. How do I get back there?

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Programming :: Echo Hello Command Does Not Return

Jan 11, 2010

I am testing the serial ports on a Single Board Computer(SBC) running Linux kernel 2.6.29. I usually do this by connecting the serial port to another PC serial port, then doing "cat /dev/ttyS0" on PC and "echo hello > /dev/ttyS0" on the SBC. However in the current system, "echo hello > /dev/ttyS0" command does not return at all! Also no characters appear on the destination port. I am running the echo command as root. The system boot messages show that the serial port in indeed /dev/ttyS0.

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Programming :: Getting Return Value From Program Ran In Background?

Mar 10, 2010

I think my title pretty much explains it. I am writing a script and I want to start a program in the background, and when that program finishes I want to check the return value to make sure there was no error.For example normal I would do something like this:

#!/bin/sh
program
if [ ! $? -eq 0 ]; then
echo "There was an error"
exit 1
fi

Now I want to do something like this:

#!/bin/sh
PRTN=`program1 &`
program2
if [ ! $? -eq 0 ]; then

[code]....

In this case if program2 finishes before program1, I don't think the return value from program1 $PRTN would be valid at the time it is checked.

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Programming :: Ofstream Return A Boolean In 'if (!ofs)'?

Mar 19, 2011

C++ code:
Code:
#include<fstream.h>

[code]....

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Programming :: Can't Understand Return Value Of Gawk?

Mar 10, 2010

I write a little script by bash.

#!/bin/bash
a=`gawk '/Iterations /{print $0}' hoge.log | gawk 'BEGIN{FS=" "}{print ($4)}'`
a=`expr 3 '*' $a`

[code]...

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Programming :: Prevent Echo As Return Value?

Jan 25, 2010

I have always encountered this problem in ubuntu bash shell scripts that echo command in a function will be treated as a return value when used in a function. e.g.

[code]...

The output would simply be xyz. Hence the echo seems to function as a "return" command when used in a function with a return value.

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Programming :: Does't Create Directory But Return As Value '0'?

Feb 23, 2010

$val = mkdir $directory, 755
print $val;
does't create directory but return as value '0'

[code]....

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Programming :: Pthreads Return Value Valid Or Not

Jun 14, 2010

I have confusion regarding pthreads return value. All in short, is the is a valid return value ?

[source]
void * myThrRoutine(void *arg)
{
struct myStruct **myst = (struct myStruct**) arg;
cout<<"In thread "<<(*myst)->var<<(*myst)->msg<<endl;
int x = 20;
pthread_exit((void*)x);
}
[/source]

This seems to work fine on pthread_join , but I want to ensure it is not by chance.

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Programming :: Python: Get The Return Value Of The Last Function?

Jun 13, 2010

But it's been hell finding an answer, or I just don't know what to look for..I have a prompt that asks for a float, and if the user doesn't put in a valid number, then it should die with an error message.

Code:
def die_with_error():
print 'ERROR: You didn't specify a valid number!'

[code]....

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