General :: Fork Behavior While Copying File Descriptors
Jun 17, 2010
I am quite confused about the following description on fork. Could you please explain it ?The child process shall have its own copy of the parent's file descriptors. Each of the child's file descriptors shall refer to the same open file description with the corresponding file descriptor of the parent.For example, I am opening a socket and then fork. Now, does the child have a separate socket or is shares it with the parent. Does I have any impact on using it in child?
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Jun 4, 2010
File descriptors with pipes-Can someone help me with this three situations, what would happen?
a) a process open the same file twice and read through two file descriptors
b) a process does fork and both parent- and child-processes read parallell
c) two processes opens and read from same file.
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Nov 28, 2010
On linux, is there a way to count the number of file descriptors open to a some file?
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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, 2011
When a application is ran from the shell:fork() is calledexecve() is calledI know the shell stats the file to make sure the required permissions are allowed in the child shell. But I can not find this in the man fork. Nor can I find this in man execve. Which one of these processes/calls stats the binary to be ran?
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Jan 14, 2010
I have run into a limit of 1024 file descriptors. I have searched a lot and have tried various solutions.How can the max file descriptors be set in Ubuntu?
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Sep 2, 2009
Can someone please tell me how to permanently increase the default file descriptors limit on RHEL4?right now ulimit -n is 1024...I'd like to increase it to around 10000
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Nov 9, 2010
Its my Friend Problem .any one can tells that how can the file descriptors limits can be raise for the squid. In cache.log running out of file descriptors warning is coming.
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May 24, 2010
I am using sabayon 5 - 32bit OS. I experience dullness and sluggish performance now and then.So number of free file descriptors is constantly zero , checked by utilising a while loop sleeping for 5 secs.would this be the root cause of the sluggishness I face in accessing application (media player)Also USB transfer is very very slow and sometimes it gets stuck
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Jan 10, 2011
I have a weird problem with one of my servers. When system is booted and right before I should se "INIT 2.86 starting..." message, all the messages disappear. Only kernel messages get logged to console and later login prompt, but nothing in betweek (there are 20+ services starting successfully, just without emitting a single character).I checked /proc/PID/fd of the boot script (in my case called /etc/rc.d/rc.boot but that does not matter).
The only significant difference in hardware to other servers is that this one runs RV350 AP [Radeon 9600] graphic card.Now, my question is: where could those FDs go or why are they not opened?Does anyone have a clue about this, or a hint?
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Dec 23, 2008
Is there any limitation on the number of file descriptors that can be opened. If yes how to find the maximum number of file descriptors that can be opened at a time.
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Jul 23, 2010
I have problem with free allocated file descriptors it's always zero!
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Mar 1, 2011
Asuming I have two files, one large file and one small file, I want to write the smaller file to the large file without overwriting the remaining part of the larger file.
Both are binary files, and the large file can become very large, so I want to avoid copying the whole file, as that will take some time. Is there any standard Linux console utility to do this, or do I need to write it myself?
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May 1, 2010
This for Kernel 2.6.29.6. I'm trying to code a kernel module that displays process information.
how to count opened file descriptors per task. I have been able to write a module that lists all the current process names along with their pid number in /var/log/messages. Basically, I cycle through the ring of processes using the macro for_each_process(task) and printk the comm and pid of each task. I'm trying to see how many file descriptors each task has open. I've been reading up in books and all over the internet. At first I thought I needed to access max_fds under files_struct, but that just lists the maximum number of file descriptors that can be opened per task, which by default is set at 256. I then thought about counting the elements in the fd_array. But then I learned that every task's fd_array is initially set at 32. Now I know that I need to access open_fds of type fd_set * in files_struct. open_fds is a pointer to all the open file descriptors. The problem is that I don't know how to access a pointer of type fd_set.
Is there a good guide or book that really focuses on type fd_set and open_fds? Every book and resource I've read never really go into depth on this. relationship between files struct, open_fds, and the open file descriptors in task?
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Nov 4, 2009
copying permissions from one file to another.I know that command for changing permission is "chmod", for example chmod 666 filename However, I have one file filename1 and by listing all contents of a directory with ls -al I can find out its permissions in form -rwwx and similar. Now I want to define exact same permissions to other file "filename2". How to use chmod command to accomplish this. Other way around would be to simply copy permissions from one file to another. Is there any command for this purpose?
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Jul 25, 2010
The current directory contains:A file called "original.txt" Many directories called "source_001", "source_002", "source_003" ... From the command line how do you copy "original.txt" to "source_001" and "source_002" and "source_003" ...
The total number of these source directories is unknown, it changes every week.
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Mar 7, 2011
Is it possible to copy a file on multiple remote machines through scp in one command?
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May 6, 2010
I'm getting a video from a camera connected to the computer and saving it to a constantly increasing file.
The thing is that I'm trying to make a non-stop copy of this file over the network (i.e. using scp, rsync or something like that).
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Nov 16, 2010
Solaris is the os used. I want to copy files from UNIX Machine to windows network drive.I know smbclient,ftp can be used. But is there any other best option i can use?
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Jul 23, 2010
I am trying to copy four files from my machine, through a second machine, and finally to the destination. The destination computer can only be reached through the second computer, and I am curious to know if there is an easy way to do this. I am able to ssh to the middle machine and then ssh from there to the destination. I know that I could just copy from the first machine to the second, and then from there to the third. I guess that I'm curious to know what kind of command I can run to do this all at once or even if I could do such a thing (which I'm betting I can). I need to copy these files as root on the destination machine too.
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Mar 13, 2011
I'm trying to resume copying from a mounted CIFS device to my local hdd with cURL. I tried
Code:
$ curl -C - -O file://myfile
and also
Code:
$ curl -C <manual offset> -O file://myfile
(looked up the manual offset using "$ wc -c")
This resumes copying if I cancel it eg with ^C.
But it does not work if I unmount and remount the CIFS device. cURL then ignores my given offset and continues again from start as if nothing were there without saying a word. With "-C -" the same effect.
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Jun 26, 2010
Create a copy of the file above and call it commands.sorted. Use the vi command to manually sort this file. I.e. use yy to copy a line, P or p to paste a line, and dd delete a line. Order the commands with the two lines starting with double quotes first. Then list the rest of the command in alphabetical order.
Anyone have any ideas what he's talking about? Can I copy a file and rename it at the same time while copying it to the same exact directory again? Now sure what the two lines things means either. I have an email out to him but it usually takes a long time for him to answer me. I got alot of work to do so everytime I get hung up it kills me.
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Jan 29, 2011
why sadc (a front end for sar data collection) would append a "?" to the output file when run from cron? And more particularly, how should I correct it? I have a RHEL 5.4 system which is doing this.e.g./usr/lib64/sa/sadc -d 10 6 /tmp/test produces output file /tmp/test when run from the command line but when run from cron the file produced is called "/tmp/test?"
Normal system logging with sysstat, which uses the same sadc command (with a couple of other options, and none of the options -d, -F, -L affect this behaviour), produces output files /var/log/sa/sadd where "dd" is the day of the month. There does not seem to be any control over this within the sysstat start-up scripts, other than use of option "-" to generate standard output files, so I expect that the dd is being done within the code. Is this associated with the "?" ?.Whatever is going on, the appended query seems to get added to everything as it still happens if I make the output file /tmp/test_$(/bin/date +\%d).Is this a bug or am I missing something fundamental about cron?
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May 10, 2011
In both Slackware 12.2 (gtk 2.12.12) and Slackware 13.1 (gtk 2.18.9), the left-hand side panel of the GTK file chooser (File Open and Save) dialog box displays three sections. The first section contains two options: Search and Recently Used. The second section contains several options. The third section are personal bookmarks I have created and stored in $HOME/.gtk-bookmarks.
Modifying the bookmarks section is straightforward, but I am searching for ways to modify the first and second sections.
1. In both 12.2 and 13.1, the second section shows the following: $HOME directory, Desktop, File System. In 13.1, several mount points now appear. I think the criterion being used is the mount point being outside the main root tree. Several of these mount points are configured in fstab with the noauto option and are user mounted only as necessary. I do not want any of these volumes appearing in that section nor the Desktop option. Is there a way to exclude those volumes and options?
2. In that same second section are two mounted volumes from a second internal drive. Those two partitions are part of my bookmarks. In 12.2 those two partitions appeared in the bookmarks section. In 13.1 those two bookmarks are ignored and instead appear in the second section. I prefer those two points appear in my bookmarks section because I prefer my own labels rather than mount point names. Is there a way to do that?
3. Is there an option in $HOME/.config/gtk-2.0/filechooser.ini to control the width of the side panel?
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Aug 31, 2009
1) Write a C program using the fork() system call that that generates the Fibonacci sequence in the child process. The number of the sequence will be provided in the command line. For example, if 5 is provided, the first five numbers in the Fibonacci sequence will be output by the child process. Because the parent and child processes have their own copies of the data, it will be necessary for the child to output the sequence. Have the parent invoke the wait() call to wait for the child process to complete before exiting the program. Perform necessary error checking to ensure that a non-negative number is passed on the command line.
2) Repeat the preceding exercise, this time using the CreateProcess () in the Win32 API. In this instance, you will need to specify a separate program to be invoked from CreateProcess(). It is this separate program that will run as a child process outputting the Fibonacci sequence. Perform necessary error checking to ensure that a non-negative number is passed on the command line.i have done with Fibonacci sequence .but i dont know how to include tht fork() function and win32 api .any one can help to finish?
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Aug 19, 2010
I've a script that forks to another script.
The problem is that the child will not return to main process.
Main script "fork.sh"
Code:
The child process "smb_fork.sh"
Code:
when running it from the terminal "sh -x ./foork.sh"
Code:
My goal is via cron connect to ~100 remote winXP computers and download a single file. There fore I like to fork the process.
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Aug 2, 2011
trying to fork multiple child but the program does not go as i want...
My code :
Code:
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
[code].....
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Jun 14, 2010
I am having problems with scp during a backup operationI added a ps -ef before and after the scp operation used during the backup.The backup is a script to backup a Zimbra ServerI am including the code segment that I am having problems
Code:
# DRCP Section. To scp newly created archives to a remote system
if [ "$DRCP" = "yes" ]
[code]...
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Jun 3, 2010
When I try to copy PDF files from one folder to another folder, it give me this error: "Error while copying "2004-SNUG-Europe-paper_...log_DPI_with_SystemC.pdf". There was an error copying the file into /media/CCDCE66BDCE64F70/Backup Master/Heterogeneous_cosimulation/Documentation" "Error splicing file: Input/output error" What is the reason of this error and how can this be fixed?
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Jun 29, 2010
I have a 7.2 GB file (VMWare virtual machine file) that I am trying to copy from its original location to the another folder OR to external hard drive...each time I try to do this, I always get the following error after the copying process reach 'exactly' 1.4 GB
Error reading from file input/output error
And I have to either Cancel or Skip
I've tried to split the files to smaller pieces but the idea didn't work as I still get the same error whenever I try to compress/ split or do any operation with this file. how I can copy this file?
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