i am trying to print the time in ms using the gettimeofday function, but on execution the shell gives: Segmentation fault (core dumped) error and leaves the program.. here is the code:
struct timeval time1,time2;
double time_used1;
//get time1
gettimeofday(&time1, NULL);
[code]....
Whenever I enable gettimeofday in my code, previous working sendto(raw_eth, buffer, ...)
stopped working and Error: Bad file descriptor. the only thing I'm sure is it's not name pollution. Since all the variable defined in main() works if I make the wrap of gettimeofday an empty function.
I needed to find the time it takes to execute a for loop... I decided to use the gettimeofday() function and wrote the following code:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sched.h> // for use of sched_setaffinity
[code]....
In my script, I need to get execution time of a command (say 'ls') in mili seconds level. For this i tried using "time" command to retrieve the total execution time in milli seconds. But, the problem is that, how to save the output of time command in a variable. The format of the command is like "time ls -R /opt" Going further, the o/p of 'time' command is:
real 0m0.003s
user 0m0.004s
sys 0m0.000s
Here, in my script, I would like to use only middle line "user 0m0.004s" saved to the variable but unable to find out the way.
output of "last -a" is as follows:
usr pts/3 Tue Aug 17 12:28 - 12:44 (00:15) dom1.broadband.za
usr pts/3 Tue Aug 17 11:06 - 11:25 (00:18) dom1.broadband.za
I need to sum up $9, which is 15+18, but the parenthesis come in way and sum comes zero.
last -a|awk '{sum=sum+$9} {print sum}'
What am I doing wrong?
logging in a server through putty in the same network when i executed last command its showing system ip logged in time and logged out time the output as followsthis is my system
oot pts1 xx.xx.xx day month date time in time out timeand similarly am geeting other than this likeroot :0day month date time still logged in this is from more than 3 days its logged in
why there is a difference in the time shown by xtime and gettimeofday ? From what I have read I understand that xtime is not frequently updated and gettimeofday is more precise than xtime.
View 1 Replies View RelatedI am using Debian linux. I have 100 timers running. If a timer expired which will generate a signal and it was mapped to a same function handler. All the timers are mapped to one function handler. The problem is if the timer expires one at a time, the function handler called at a time. But if the 2 timers expires at a time, the function handler is called one time only instead 2 times. Is it possible to invoke the function handler as many times based on timer expirary happens simultaneoulsy?
View 14 Replies View RelatedIs there a way to get the current time as provided from NTP (not the currently set time on the server)?
View 4 Replies View RelatedI am trying to set time using settimeofday in linux. But it sets local time. i.e works like SetLocalTime in windows. But I want to set system time(like SetSystemTime in windows). I could'nt find no other api in linux. What should i do? I had tried with mktime/gmtime apis
View 3 Replies View RelatedI have a Lenny Raid-5 setup, and I use rsnapshot to occasionally backup the raid to an old external hard drive that I otherwise leave unplugged. That external went bad, so I figured I should setup its replacement with encryption and keep it off site when not in use.
While googling and coming across LUKS, I can across this post this post that mentioned the drive should be be filled with random data before setting it up for encryption, and had the following as a potential sufficiently-good option over the time-intensive dd /dev/random route:
badblocks -c 10240 -s -w -t random -v /dev/sdx
I was unfamiliar with badblocks, and came across this post after a google session which noted the time duration of scan is an important factor as well as the result.
I sshed into the NAS, and was about to run badblocks first in read mode, then in write mode, but then I considered the time consideration. I was going to use something similar to the following: nohup badblocksstuff &
My Question: Is there a way I can append to the resulting nohup.out a time to complete value?
I am using:
user@unknown:~$ sudo command -option > log
to save the results of "command" to the file "log", but I'd like to also get the result on the terminal, is this possible?
I am using ubuntu 10.04 lts.
How can I make the Linux ping to show the requests 'time out' instead of omitting the output?
Just like the Windows version of ping.
Let's say I am pinging a host, and want to output to a file each reply and its timestamp of when this started.
I know that it can be done with a loop and a shell script. Something like this
DO
echo "$(date)" >> results.txt ###includes the time and outputs results to txt###
ping -c 4 HOST >> results.txt ###a total of 4 pings at a rate of 1 per second###
REPEAT UNTIL USER PRESSES CTRL-C
Now, my first issue is that I need to be able to see results real-time as well.
Is there a way one can print to BOTH a screen and output? If one uses the ">>" command, it is essentially sending everything to the file. Running another ping command in parallel is not an option.
Terminal with real time dmesg output I want to use tty12 for system messages. Is there a way to mirror all kernel messages to there?
View 2 Replies View RelatedI have been having a lot of trouble lately with installing from CD/DVD. The DVD reader/writer on this laptop is new. Nevertheless, trying to install Ubuntu onto an exernal HD, I get 'input output error on sr0 logical block (a large number) After a long time the booting proceeds to a point, but I never get the actual installation started, and have to shut down manually.
The CD is fine, says the Ubuntu-checker. I just installed using my sons laptop, and there was no trouble. Question: does this indicate a motherboard failure? A memory block damaged? Do you know of a diagnostic tool I can use to check the reading of a CD/DVD?
As i am new to C++ i couldn't figure out how to input a file and make some change on the file and produce a output file. like this problem i have is.
"Program that processes an input file and produces an output file. The input file will contain lines of data, each containing two floating point numbers. The lines of the output file should contain the two numbers read and their average (with a '$' sign and 2 places after the decimal point)."
I have a file with something like** The total time for processing is 1245 seconds *when I doawk 'BEGIN{FS="The total time for processing"} {print $2 } ' fileI get correctly on screen 1245 seconds *but when I try to direct this to a file awk 'BEGIN{FS="The total time for processing"} {print $2 } ' file > outputthenoutput is empty ie the 1245 seconds * is not saved in ...Know why?
View 4 Replies View Relatedtime a.out
106.130u 0.000s 1:46.28 99.8% 0+0k 0+0io 83pf+0w
As per my understanding of the man page:
the first value is the time since the code execution started and ended,
the second values is the time spent in usermode
the third one being in kernel mode
Is the 99.8% indicating time spent in kernel mode?
Also, what does this indicate?
0+0k 0+0io 83pf+0w .
The program definitely takes more than a minute to execute - then why is the first value so small?
With the command "tail -300 /var/log/apache2/access.log | less" i can look in the log for the 300 latest visitors. and i wanted to ask if it's possiblle to get that command to run from a php file and if yes how ?
View 4 Replies View RelatedLex's (actually Flex) output contains this:
Code:
#ifdef __cplusplus
extern "C" int yywrap (void );
[code]...
I am trying to learn C Programing and I'm having trouble on the output of my script. my script should count the characters in input but it doesn't give me any numbers..
here's my program code:
Code:
#include <stdio.h>
main()
{
double nc;
[code]....
i am having problem with displaying my text. my text file is displayed in such a way and is called test.......
Code:
Sam Worthington ... Jake SullyasZoe Saldana ... NeytiriasSigourney Weaver ... Dr. Grace AugustineasStephen Lang ... Colonel Miles QuaritchasJoel Moore ... Norm Spellman (as Joel David Moore)asGiovanni Ribisi ... Parker SelfridgeasMichelle Rodriguez ... Trudy ChaconasLaz Alonso ... Tsu'teyasWes Studi ... EytukanasCCH Pounder ... MoatasDileep Rao ... Dr. Max PatelasMatt Gerald ... Corporal Lyle WainfleetasSean Anthony Moran ... Private FikeasJason Whyte ... Cryo Vault Med TechasScott Lawrence ... Venture Star Crew Chiefmore
What i am trying to do is for the program to read "as" and then from there start a new line... thus the expected output is...
Code:
Sam Worthington ... Jake Sully
Zoe Saldana ... Neytiri
Sigourney Weaver ... Dr. Grace Augustine
[code]....
I keep getting the error saying ...
Code:
editmain.cpp.98:error: initializer fails to determine size of 'str'
what does this mean, and how can i be able to format my file in the way i want?
have a file (called it A) contains;
hostname 192.168.23.65
hostname 10.18.13.253
hostname 10.18.16.253
[code]...
See the first program below :
Code:
This code when compiled gives the following errors:
1. conflicting types for 'fun' at line no: 9
2. previous declaration of 'fun' was here at line no: 3
Why is this happening?
If i modify the above program as shown in the second program below:
Code:
This code when compiled gives no errors.
Why the difference occurs between the first and second program?
is there a way in code to tell SDL to be directed to another desktop? This is so I can full screen debug rather than running in windowed mode. By other desktop I don't mean other machine just another workspace.*
* sorry don't know correct term for this it seems in Debian you have 4 you can select from the low right of the desktop, seems to be called desktop 1-2 in ubuntu.
I have a script that generates a bunch of output, including the expansions details provided by: set -v -xI am trying to pipe everything that is displayed to a file, in addition to displaying it on the screen. I've managed to get stderr and stdout into the file, but the expansions are only printed to the screen. Here is what I have so far:sudo -u <user> source my_job.sh |tee my_log.txt 2>&1
View 2 Replies View RelatedI am again struggling to make a script work, but hey, it is fun, I am learning new things. I discovered the set -x option which was, for me, like the second coming. Still, what I am not able to do is redirect ALL output to a (log) file, including what is produced by the -x setting. Let's assume a very simple script:
Code: #!/bin/bash
set -x
source="/home/atelier/Bureau/"
ls -la $source and I am running it as . test.sh >> /var/log/test.rmcb.log
The result of ls goes inded into the log file, but the rest still shows on the console where I am running the script: Code: ++ source=/home/atelier/Bureau/
++ ls --color=auto -la /home/atelier/Bureau/ Is there a way to redirect EVERYTHING to the log file ?
I need to re-direct the output within an awk script, but not to already known, fixed filenames. The output file names depend on values of the fields. For example (the actual problem is surely more complicated), if, on a given line, the second field is DATA, the third is 1984, I would like to print some information in a file called output_DATA_1984. This could/would change in the following line of the same input file. Such things are pretty easy in bash, put I cannot do it in awk, as I can only find manual references for redirecting output to fixed filenames between double quotes.
View 2 Replies View Relatedi'm programming a small widget for a panel and need some information from my system. The command on the shell would be whoami to find out which user i am. This information is needed for my widget to set up the title of the widget, the information of the user will be retrieved out of the /etc/passwd (the code works just fine), but i don't know how i can get the information. One possibility would be to create a child process, call whoami with execlp(). But how can i retrieve the output of that process?
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