Programming :: No Output To Log File From Daemon Program?
Mar 18, 2011
I am learning Linux daemon programming and write a simple daemon program. The issue is no data is written to the log file (/var/tmp/simpledeamon.log) though the file is successfully created (it's file size is zero from ls -l output). Could someone kindly point out the error in my program,The code is based on the Devin Watson's article at Here is the code:
// simplydaemon.cpp
// A simple Linux daemon.
#include <sys/types.h>
[code]...
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Jun 8, 2009
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?
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Aug 14, 2010
I am creating a 15 integer array which is input from the user and outputted for the.
Ex.
Enter the array values: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Your values are: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Code:
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Sep 15, 2010
The below program is giving unpredictable and wrong output when I compile with g++ under Ubuntu OS , tried with the complier avilable with Ubuntu 8.04 and Ubuntu 10.04 LTS.
But it works fine when complied and ran Redhat g++ 3.4.6
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Jun 29, 2011
I'm using Ubuntu and I'm programing with eclipse CDT. My goal is to execute a php file and read the output to my c++ program. To do so I thought I should use fork(), dup2() and execl. When in shell, the call "php myscript.php" worked just fine, but when in c++ I tried:
execl("usr/bin/php", "php", "home/geiger/workspace/SemiServer/server_content/myscript.php", NULL);
And it didn't work (the process wasn't terminated and I got no output). I tried different version of this call, like losing the "php" string and/or drop "home/geiger" from the path string, to no better result.
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Jan 15, 2010
Ok so Basically i have 2 questions
1. i know how to create a file with c++ using but is there a way to save it to a specific location on your computer with windows and linux
Code:
2. i need to know how to run/execute/open a file in a c++ program im using and its not working
Code:
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May 1, 2011
My script.
This is may script:
Code:
Problem: Output file doest not exclude the values in grep -av
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Feb 28, 2011
My employer issues pdf files with everyones work schedules. I copy the content and save it as plain text in a file called unformatted (hope to be able to automate this step someday). Im working on a SED script that reduces unformatted to only display what I want to see and saves the result in a file Iïve named formatted. After that I have to manually copy formatted and save it with that days date as a filename e.g. 2011-02-25 or whatever day is scheduled in the pdf, for use on a mobile device (Nokia N900). I noticed that the date occurs on certain lines in the file so I added a line like:
sed -n 's/^Date: (201[1-9])/([0-1][0-9])/([0-3][0-9]).*/1-2-3/p' < unformatted >theDate
That creates a file theDate with the date in it that I wish to use as the filename for this particular instance. So I would like to skip the file formatted all together and have the sed- script write to a new file using the content of the Date as a filename, but how do I make that happen? And of course it would be more elegant if I could skip the intermediate theDate file as well.
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Feb 23, 2011
Is there already a program that reads multiple pipes or file descriptors and writes to the standard output (not splitting lines).Like cat, but reading all files simultaneously and preserving lines.It is needed to avoid coding of select/epoll loops or using multithreading in simple programs. Like "select loop for bash".
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May 6, 2010
have a file (called it A) contains;
hostname 192.168.23.65
hostname 10.18.13.253
hostname 10.18.16.253
[code]...
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Aug 6, 2010
I 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 $source and I am running it as . test.sh >> /var/log/test.rmcb.log
The result of ls goes inded into the log file, but the rest still shows on the console where I am running the script: Code: ++ source=/home/atelier/Bureau/
++ ls --color=auto -la /home/atelier/Bureau/ Is there a way to redirect EVERYTHING to the log file ?
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May 3, 2011
I want to pipe the output of ls in a folder to a file (lets call it test.txt) but when i do so, but when i do ls > test.txt in test.txt there is also test.txt (logical
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Jul 24, 2010
Code:
I'm trying to make several files: each named after the display and containing resolutions. But for some reason I get null when trying to read lines.
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Mar 15, 2010
i have wrote a long piece of code above with the "main" which is calling openFile( &fout, filename )filename contains the txt name in a form of "data.txt"i wanna read the data from the file and output it into fout for later use.the data in that file is a vector looking interger group.i have the following code:
int openFile( ofstream * fout, const char * filename)
{
ifstream iFile(filename);
[code]...
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Oct 12, 2010
I'm writing output of top command to a file However since top does not provide time I would like to append the 'date' command and then write all this to a file.
so something like top -d 1 -b; echo 'date' >>file
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Feb 11, 2010
I have got a script with an outer and inner loop. The inner loop issues loads of echo's which need to be redirected to a log file determined by the outer loop. The obvious solution is to redirect every echo to >$LOG and set LOG in the outer loop.
Code:
for f in $FILES ; do
LOG=<logfile>
for l in $LINES ; do
[code]....
it is possible to map stdout to $LOG in the outer loop without having to redirect every subsequent individual command output?
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Sep 6, 2010
I did a select on my db and now I need that this if consult return true for me salve the columns information in file. How I do this in Shell?!
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Sep 10, 2010
Consider this PHP Script or just skip to the Output:
Code
Code:
-bash-2.05b# cat myDate.php
#!/usr/bin/php -q
<?php
[code]....
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Sep 4, 2010
I have a requirement like this:Cut the characters from each line of a file with following positions: 21-24, 25-34 ,111-120.Thse fields now need to be placed in a tab delimited output file.Currently this is how I am achieving it:
#!/bin/sh
cat newsmaple.txt | cut -c 21-24 > out1.txt
cat newsmaple.txt | cut -c 25-34 >out2.txt
[code]....
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Mar 15, 2010
I have a problem when using awk:
e.g: awk '{processing text}' File1 > File2
But when I'm processing the File1, I want to print out some messages to the screen (not the File2). How can I do that?
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Feb 18, 2010
The perl script I wrote works fine if I print the result to screen
x0_amber.pl 1 1000 0 5
But whenever I want to output to a file with
x0_amber.pl 1 1000 0 5 > x0_out
it never really prints out to the file.
It worked earlier, but I was playing with my PATH lately, I don't know if it's related to that
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Jul 22, 2010
Within PyGTK I'm using gobject.spawn_async to launch a bash script. I would like the output of that bash script to be displayed within my application. I have a textview set up to receive the text ...
Here are the commands that launch the program:
Code:
def run_command(command):
global keep_pulsing
keep_pulsing=True
(cpid, cstdin, cstdout, cstderr) = gobject.spawn_async(command,flags=gobject.SPAWN_DO_NOT_REAP_CHILD|gobject.SPAWN_STDERR_TO_DEV_NULL,standard_code....
Here are the two callback functions. But like I say ... I have no idea how to get that data from the 'cstdout' file descriptor into a textbuffer.
Code:
### THE FOLLOWING ARE GLOBALS:
textview = wTree.get_widget('textview1')
textbuffer=textview.get_buffer()
def update_textview_callback(fd, condition):
global keep_pulsing
if keep_pulsing:
progressbar.pulse()
code....
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Apr 10, 2011
i am trying to daemonize my (java) program on ubuntu. For that end i created a script based on /etc/init.d/skeleton script which obviously uses start-stop-daemon.
But I cannot make the process (java program) run on the background. it keeps running in the same terminal i start my daemon script. Trying --background option for start-stop-daemon does not help.
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Nov 11, 2010
i want to make a program to write the result of access to a file ,i mean for example a user wants to (open,delete,edit)a file but if he has no access to this file ,something write to a log file.so after that i can check which user got access denied by accessing to which file.or if any tools available that can do this?or if there is any built in log access file that record the permission denied to files?
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Mar 14, 2009
i wanted to know how can I pars a xml file (read data from xml file) and from C program.is there any function to do this for me in C.
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Mar 7, 2010
An error occured during running a code. I've made run configurations properly and I've chosen GNU Elf parser,Elf parser, Mach-O parser and Cygwin PE parser as a binary parser. Eclipse CDT can not find any error in the code and code runs in terminal properly. Here are the code:
Code:
/*
* pmutex.c
*
* Created on: Mar 7, 2010
*/
#include <stdio.h>
[Code]...
Eclipse denies to run it.I've made an investigation over the eclipse.org, but I can not find any solution.
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Jun 26, 2011
I have the following problem. I call a C++ program from a Java servlet by using Runtime exec. The OS is ubuntu and I use Netbeans 7.0 with Glassfish 3.1 web server.The program executes but it does not open and write into a specified file in a specified folder. The same C++ program compiled under Windows opens and writes this file.How can I solve this problem in Linux?
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Jul 19, 2011
how to detect if a file is being opened by any application so that i can block it just before opening it... Actually i am working on android and using iNotify in JNI to detect the OPENING of a file...but the file is getting opened before the iNotify detects it..and therefore its displaying the contents of the file unmodified .. The actual requirement is that if anyone is trying to open the file it should be modified by my program and then the modified file should be opened.
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Sep 3, 2010
i create a file with .py extension and run it then on windows it opens up directly in command prompt, but wat to do if i wish to do the same in ubuntu, i.e. i want the .py file to run in terminal as a console program, which does not happen as such.
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Sep 2, 2010
I recently faced a problem. At my college, I linked my laptop with my friend's laptop with an ad-hoc wifi network. I wanted to send him a file. I was running Ubuntu, and he was running XP. Unfortunately, I could not find an easy way to send him the file. Another problem I faced was when I wanted to transfer the contents of my hard disk to another computer. I had to install Filezilla server on the other computer, and upload the files from one computer to the other.
I feel that its a really cumbersome method of transferring files in the same network. Mobile phones have bluetooth, and a file can be sent to another mobile very easily without any fuss. Does anyone know whether any such program exists already? If not, I want to write such a program that will allow one user to add another user to a personal network, and send or recieve files and/or communicate in other ways. The only language I know is Python (self-taught). I was wondering what GUI framework to use. I've never written a GUI program before, and would like to hear your opinions. This will be a very basic program, and must be able to run on many platforms.
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