Programming :: Setting The Umask To 0, Have Full Access To The Files Generated By The Daemon?
Jan 7, 2011
To create a daemon, you need to execute these 2 lines (among others):Code: init log
umask 0 What do each of these do?I didn't find anything on the 1st line. (The queries returned mostly "the log of the init (process)".)Google cast some light on the 2nd line: By setting the umask to 0, we will have full access to the files generated by the daemon. Even if you aren't planning on using any files, it is a good idea to set the umask here anyway, just in case you will be accessing files on the filesystem.
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Apr 3, 2009
I have several directories, each owned by root and a group of the same name,By setting the sgid bit, I made sure that newly created files and directories are owned by the correct group, and that directories have the sgid bit set too.On each newly created directory or file, the permissions are set to 755. This is because this is the default umask, and I cannot change a users umask. I actually only want files created below a particular directory to have group write access, inheriting this behaviour to newly created directories properly.I'm not on samba or NFS, I have to do this for SSH users.The filesystem is ext3.I started to fool around with ACLs, but couldn't find what I was looking for.
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Dec 29, 2008
We have users that send files to our server via sftp... We normallyhave umask set to 022 but for these files we would like to force a umask of 002... I've tried to change in the .bash_profile but does not seem to make any difference...
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Jan 30, 2010
I'm struggling to understand an aspect of mounting and mountpoints with /etc/fstab. There is a large number of sites and threads that make recommendations using things like uid, gid, umask, and other options. These methods, however, which I've used, are file-system specific, useful only for filesystems such as (V)FAT and NTFS that allow them.My current situation is that I am mounting partition /dev/sdb5 in, let's call it /media/myMount. My goals:Mount this partition automatically upon boot using /etc/fstab...The partition should be fully accessible only to a specific user or group.What I've done is create the mount point in /media:
If user michapma were to carry out the mount, I believe it would work; however, I want the mount to happen automatically during boot. So, how can I achieve my user (or group) permission goals for this and any other such partitions using fstab?The manpage for mount has been helpful, but after reading many tutorials and forum threads, the only way I know how to do it is to have the user do the mounting or rely on the file-system specific options.
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Mar 16, 2011
My Debian system has by default umask permissions of 0022, which I never liked. One user can read all the files of another seems very insecure to me.
I am planing to set it to 007, so that user and group have rw but all others have none.
Are there any side effects to that? I have noticed from a trial I did where I was changing permissions on the filesystem that some system stuff in the OS does not work anymore, if "others" have no read permission anymore, so that is why I am asking.
And why are chmod / umask permissions sometimes stated as 4 digits? What is this "all" group in the end? Isn't that already covered by "others"?
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Nov 8, 2010
I am trying to configure mpd (music player daemon) to access my music files that are stored on a windows server (NAS).
In the mpd configuration file I have to point to the directory in which the music is.
How do I do that? Is it something to do with mount?
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Mar 16, 2011
Does anyone have a solution for cron file permissions. I need them to be automatically generated 640, right not I believe they are 0644. Could I add a umask varible to the syslog.conf file to set the umask for cron generated files? Or is there a better way to do this. I am speaking only of logs generated by root.
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Aug 20, 2010
I ran a test where I filled up the /var partition. The disk_full_action in auditd.conf is SUSPEND. I was expecting to see a message in /var/log/messages to indicate that the audit daemon was suspended because it did not have any space left on the partition.Why didn't I get these messages? Also, how can I tell if the audit daemon is suspended?
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May 31, 2010
Im having trouble setting my SAMBA server correctly. I have two Win machines, one with WIN7 and one with XP. I have one Ubuntu machine and Ubuntu Server 10.04. My problem is that I can only acess files from the Win 7 Machine. When I try to map out the shared dirs on my serverI get asked for user and password, when I enter my creditensials it dosent help.. What to do? I used the sample smb.conf file and open for no restrictions..
[Code]....
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Oct 28, 2009
I have ext3 partition mounted on /mnt/shared/ as follows
Code:
Permissions above are of the actual mounted fs.
Goal is to have all files created on the fs
1) to belong to group 'users'
2) to have this groups permissions set to rw (rwx for directories) so that all users who belong to group 'users' have full read/write access to data and everyone else to have only read access.
Now because of setgid bit (s) in group permissions every file created has group 'users' and additionally setgid bit is set for directories. Because every users umask by default (on my system) is set to 0022 all created files will have permissions 644 for ordinary files and 755 for directories.
Net result of above means that users A and B who both belong to group 'users' won't be able to modify files created by the other.
So how can I make files created on the fs to be created always with umask 0002 WITHOUT changing default umask for users that is used elsewhere (like in their home directory) ?
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Aug 21, 2010
I am sitting here at my computer at 2:30am on a saturday morning with no idea what the hell im doing. But here's my goal I have a KML File for Google Earth. This file is generated with the GPS locations of certain sites.
I have a text file with extra information about certain sites. What i'm trying to figure out how to do is by using perl I want to open the text file grab the first location on line one and search for it in the KML file. When that line is found I want to edit the Description field in that KML file and add something to the description and change the placemark from Yellow to Blue.
Can anyone give me advice on the best way to handle this and where I can start. I can understand if nobody wants to give me the answer directly but I would like to be pointed in the right direction
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Aug 5, 2010
I wanted to get the ORACLE_HOME of the listener's running on the server.I have been using the following to get the reult. /opt/oracle/admin/PHYPE/bdump> ps -ef|grep /bin/tnslsnr|grep -v grep|awk '{print $9}'
Result is as follows
/opt/oracle/product/10.2/bin/tnslsnr
/opt/oracle/product/9.2.0/bin/tnslsnr
/opt/oracle/product/10.2/bin/tnslsnr
/opt/oracle/product/10.2/bin/tnslsnr
/opt/oracle/product/9.2.0/bin/tnslsnr
/opt/oracle/product/10.2/bin/tnslsnr
Now i wanted to cut the /bin/tnslsnr part and the remaining should write to the file.
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Apr 27, 2011
I'm having a bit of trouble understanding umask and mkdir in C++. In my program, I want to create a directory with the permissions 755.
If I do:-
Code:
The permissions come out all messed up.
But if I do:-
Code:
The permissions are set as expected.
I am having trouble understanding why umask(0); is needed, and what is the 'proper' way to use it so I can make my directory. From what I can understand from the man pages and everything, I need to set the umask in my program to allow it permission to make a directory with those permissions? And I don't get why umask(0); fixes it anyway!
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Jan 24, 2010
I write my courses with Latex and I used Kdvi to read them. Since there is Okular the rendreing is very bad and I have to use back xdvi which works perfectly but is less friendly. I have no problem with pdf files. Did somebody exprience the same thing? How is it possible to solve it? I forgot to say that the problem occurs with opensuse 11.2, 11.2 and I've updated to the last version of Okular
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Oct 8, 2010
I want to write a program in C which will generate a maze randomly and find the solution for it ..
The idea behind is in [url]
How the 16 bit integer is stored in a variable...Earlier I wrote a program on trees and displayed it using dotty...Is there any such tool to display a maze...I am using ubuntu 10.04
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May 4, 2010
I'm using mrtg to generate html files. With mrtg , i use indexmaker . Inside html files , i have found some html tag like "<SMALL>some text</SMALL>".
There is the manner to delete text inside two tags ? With bash script?
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Jul 3, 2010
Is there an online resource to lookup error messages generated when compiling C++ code?
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Aug 25, 2010
I have two sets of data. 1,2,3,4 and 6,7,8 and I have written a fortran code to put them in order as below:
program gap
implicit none
integer:: i, j
do i = 1,4
do j = 6, 8
[Code]...
I want a space once every row loop has finish.I am dont know how to write the data as shown above using the fortran code in this post.
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Apr 25, 2011
Not sure if this is the right place to ask this question. In Solaris we have umask (shell builtin) and /usr/bin/umask. However I could not find /usr/bin/umask in Linux.
I want to know the difference between both and how can we achieve the functionality of /usr/bin/umask in Linux as its not there...
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Oct 1, 2010
Code:
<html>
<head>
</head>
<body>
[Code]....
Alright this works fine to pull the directories/files in the /var/Store/2010/ directory.
But when you click on of the links it tries to http://'serveradress'/$filename
note that $filename in the url is the filename clicked on so the php script is working. but I need it to change to that dir so that you can see the folder/files there and work your way up/down/side wise thru the folder tree to where you need to go. Not try and pop it as a direct url which doesn't work.
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Sep 30, 2010
I need to figure out how to arrange for the fastest-possible read-access of a large or huge memory-mapped file. I'm writing high-speed real-time object-chasing software for a NASA telescope (on earth). This software must detect images of fast moving objects (across arbitrary fields of fixed stars), estimate what direction and speed the object image is traveling (based on the length and direction of a streak on the detection image), then chase after the object while capturing new 4Kx4K pixel images every 2~5 seconds, quickly matching its speed and trajectory, then continue to track and capture images until the object vanishes (below horizon, into earth shadow, etc).
I have created two star "catalogs". Both contain the same 1+ billion stars (and other objects), but one is a "master catalog" that contains all known information about each object (128 bytes per object == 143GB) while the other is a "nightly build" that only contains the information necessary to perform the real-time process (32 bytes per object == 36GB) with object positions precisely updated for precession and proper-motion each night. Almost always the information in the "nightly build" catalog will be sufficient for the high-speed (real-time) processes.
[Code]...
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Mar 9, 2011
I have a Kingston 8gb Datatraveler that has been giving me troubles lately. For some reason after I delete files from it it still shows up as full and the files are shown in the hidden trash files. How do I get rid of these files? I can't delete them as they just show back up. Also, I tried to format the drive with gparted and it won't unmount. When I right click and select information, at the bottom it says: Unable to find mount point. Unable to read the contents of the file system. Because of this, some operations may be unavailable.
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Apr 27, 2011
I have written a daemon server. I would like to add the ability for the daemon to update itself. That is, it should be able to download the latest version of the code (when it receives a signal from a client) and then restart itself. I am stuck on getting the daemon to restart itself. The problem is killing the old daemon without killing the process that is starting the new daemon. In my latest attempt, the daemon that is updating itself runs a program in a subshell (using system) that starts a restarter daemon that runs the original daemon (again using system) with the restart command option. With the restart option, the new version of the daemon sends a terminate signal to the old version. Obviously, when I run the original daemon manually with the restart option, it restarts reliably. I figured that issuing the same restart command from a daemon would adequately isolate the process doing the restarting from the program being restarted. Using ps, I can see that the daemon does actually restart. However, the client locks. In fact, a few times, the OS locked and I had to reset.
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Jul 25, 2010
I have a 60GB partition with / and home on it. I logged on yesterday and it gave me a warning saying that I had only 1.9 GB of disk space left. I ignored it for a day and assumed that i had too many videos and pics.But the next day i had not added any files or downloaded any software but i had 0B left. I used the disk usage analyser and found that 33GBs came from /var/log. It was from two log files. syslog and daemon.log 16.5GB each!! I opened them up and i found that this line of text was repeated hnundreds of thousands of times.
Code:
Jul 22 19:32:36 aulenback-desktop ntfs-3g[5315]: Failed to decompress file: Value too large for defined data type
[code]...
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Apr 21, 2010
I would like to know if is it necessary(and why) to use setsid to create a session leader in order to create a daemon process?
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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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May 10, 2010
I am working on a daemon that I want to change some variables while its running. Is this possible?I want to implement a command line type interface for my daemon so I can send it commands that will change the current values of specific variables, and also be able tell the daemon to load/save a config file.The only thing I have found so far is passing arguments to a daemon, but that seems to be a one-time shot when your first starting it.
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Jan 5, 2010
I want to create a script which toggles a daemon (here proftpd). On the first execution it should start it and on the next one it should stop it but first check if proftpd is already running or not (and make the decision to start or stop on that).I have created this script:
Code:
#!/bin/sh
# proftpd-toggle
[code]...
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Mar 8, 2010
Am not sure of the best way to go about writing a script. All I need at the moment is to start a java http server program at startup.How should I write languagetool.sh so as to be able to stop the script execution?
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Jan 15, 2010
I am currently trying to set up a small network in which my first computer has a NFS share going to three other computers. I have been able to set up this share correctly, however I am having problems in granting full Read/Write permissions to all user accounts across the computers.
At the moment I am not using NIS or any-other account synchronization tool and I am wondering if there is another way, without the need of the mentioned tools.
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