I am trying to ptrace a process and when the system call is 'cd' change directory,
the ptrace process is able to trap it by comparing it against "__NR__open" system call. When I try to read the name of the directory from ebx register using peek_data I am getting ".message" and not the directory name.
The same thing works fine when I am tracing a file open system call.
In practice I have a script that call a java program that call a linux system command. The script if I run it, from a shell functions well,so it is not a java problem. The problem come out when i put this script in a crontab schedulation. The result in this case is that java do not execute the system command. I think it depends on crontab
View 4 Replies View RelatedI am trying to run the configure command to install a package in linux with Java. Now my workspace location of Eclipse project is /home/user/Workspace/projectx. The source package say zebra is located in /project/test/zebra. Now there is a configure script which I want to run using java and all the outout files will also be created in /project/test/zebra.
Now in Java the code I am using runs the configure command but all the files it creates in current workspace of project which is in /home/user/Workspace/projectx directory.
Now as I tried to do 'cd' command but as it's internal command of linux so it doesn't work and I don't know how to make it work. code...
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
I want to populate an array of string by files exists in directory on mounting of file system. I got an entry point for file system mount. I can use either do_mount function or fill_superblock function. But I am not clear about how to call readdir from there itself. I need inputs for calling readdir from fill_superblock function.
View 2 Replies View RelatedI have a script that I would like to run when my laptops connects to a new network (e.g. changes to another SSID). I've done some searching on the net but could not find any suitable solution (but I bet there is).
View 6 Replies View Relatediam trying to add a system call to the kernel version 2.6.33.7.Iam running fedora 13.I have followed all the steps given in this <hekimian-williams.com/?p=20 -> tutorial,but iam getting a error in make saying undfined reference to mysyscall in syscall_table_32.
View 1 Replies View Relatedwhat is what is signal 0 in linux system call ?i can't find that in kill -l signal list . i need to know what is signal 0 . * for examples signal 1 is SIGHUP and signal 2 is SIGINIT . what is signal 0 ?
View 1 Replies View Relatedin below program why was new_args[0], rather than the reference the_cmd, passed to the execvp system call?
Code:
/*
A _very_ limited shell program
[code]....
My ubuntu version is 9.10
I was working on adding a call system to my linux kernel.
I tried a lot of threads and .pdf files which explaining how to add a system call. Like :
1- This thread
2- .pdf file
and many ..
I tried working with linux-2.6.18.1 , 2.6.33.1 , 2.6.28.1 and many many.
But , all of them are returning -1 as result ..
I prefer working on 2.6.28 kernel version or above like 2.6.33.1
I have a process that forks, where the childs puts some data of random size and exits while the parent should get the data and does some manipulation.. here I have used a pipe for child to write the data and parent to read the data.. Child simply dumps the data, and the data is of any size even child and parent doesnt know.
I have used select in the parent to see whether there is any data coming on the reading end of the pipe.. if there is a data.. I copy into a buffer.. Im reading the data continusly when the child exits after closing the writing end of pipe. Parent gets blocked on the read part But my question is how parent know the other of pipe is closed when using the select call. In otherwords.. while using select in readfds, how would i know the other end has closed the pipe..
mplement the read system call in unix...i want the code for read system call...
View 6 Replies View RelatedI have added a new system call for kernel version Linux 2.6.25-14.fc9.i686. after kernel compilation and running the user mode program i am getting the below error
Error :: Function not implemented
Error number 29
I cannot find the syscall_table.S or entry.S file in the source code , so i didn't made the entry of the syscall in this file, how much necessary the entry of syscall presence in this list and how to get this file?
I am searching for any system call similar to "ls" command we use in shell. My requirement is knowing the files and directories in curent working directory and process them based on there type. Here as of now I spawn another procees with system command like system
("sh ls -l | grep ^d | awk '{print $9}'").
Instead of this I want to use any system command where I can capture this information directly into my local character buffer. My opinion is that system calls will not spawn another process as a result less time it takes, another reason is once I use the system command again I need to capture the information to a local file then again read it into local buffer. I want to avoid the file manipulation here.
I am trying to figure out how i would go about finding out where system call is made and error checking is not done. I have code below, if somebody can point me in the right direction where system call is made but error checking is not done.Quote:
#include "shell.h"
#include <stdio.h>
#include <string.h>
[code]....
I successfully added a new system call in CentOS Kernel but I don't know where to view it! My kernel version is -2.6.32.5
View 2 Replies View Relatedhow to create a new system call Linux? what is the process of creating ?my project is to create a system call for displaying owner of a file..where exactly we have to write the system call code? and where are the places need to change ?
View 5 Replies View RelatedI'm trying to use system to call echo and pass variables to it. That was a success. The problem is the variables inside the while-loop i wrote cannot be manipulated. what I'm doing wrong here? here's the code:
Code:
#include <iostream>
#include <stdlib.h>
#include <string>
#include <sstream>
[Code]....
How can it be determined whether a function defined in some file of an application source-code(meant for multiple operating systems e.g., Linux, AmigaOS) is actually called when the application run on Linux?
View 9 Replies View RelatedAs per my knowledge, one can use systemcall to call the driver functions for example using open, close... Now is there any way to call driver functions directly from application without using system call?
View 4 Replies View Relatedim writing a simple socket program and im getting below mentioned warning msg. what does it mean and what i have to do to avoid this warning ??
/usr/include/sys/socket.h:214: note: expected 'socklen_t * __restrict__' but argument is of type 'int *'
I am looking for a open source system to manage the cdr files generated by the cisco call manger. I have found a couple of systems but they are too costly.Is there any cheap or free software that can build a solution for this purpose.
View 1 Replies View RelatedI want to test my system call that be goint to add to kernel, But when i finish compiling kernel, i found my system call code not work. the code i want to return the system time "struct timespec":
/*----------Start of mycall.c----------*/
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/kernel.h>
[code]....
so i want a method to test the new system call before compiling kernel.
Anyone know the reason why a sleep( ) on a Redhat Linux OS would cause the system to indefinitely hang? It's doing this every 10 or so calls in my program and I have to press the reboot button on my computer. My program is reading from a UDP port that has messages sent to it 20 times per second. When I sleep I assume the internal UDP buffer is getting more and more filled.
View 14 Replies View RelatedThese are the settings on my server, which has a static ip:
Code:
[tim@computim ~]$ cat /etc/exports
/media/cavern 192.168.1.*(rw,sync)
Code:
[tim@computim ~]$ cat /etc/hosts.deny
portmap:ALL
mountd:ALL
rquotad:ALL
statd:ALL
lockd:ALL
Code:
[tim@computim ~]$ cat /etc/hosts.allow
portmap: 192.168.1.2/100
lockd: 192.168.1.2/100
rquotad: 192.168.1.2/100
mountd: 192.168.1.2/100
statd: 192.168.1.2/100
When I try to mount the disk from my client machine I get the error:
Code:
[tim@localhost ~]$ sudo mount -t nfs 192.168.1.10:/media/cavern /media/cavern
mount.nfs mount system call failed
Thinking the problem might be due to iptables I tried the following command as recommended by a book I found on google:
Code:
sudo iptables -A INPUT -i wlan0 -f -j ACCEPT
didn't help so tried disabling the firewall - still getting the error
Both machines are running FC11 - should i be using nfs4?
i've written small tool in C which makes measurements on my router (OpenWrt White Russian).
It is working as a deamon. If the tool is started manually, everything works fine. If it is started per script on startup, the following system call doesn't work :
Code: sprintf(command,"/bin/cat /root/%s%s | /usr/bin/ssh -p2222 user(at)host -i /root/.ssh/id_rsa "/bin/cat >> result/%s%s"", apmac, source, apmac, dest);
rc = system (command); the returned rc in this case is 256.
first i thought it is a problems with the user rights for the tool, so i have added +s to it. but that didn't help. as i said, when the daemon is started by hand, the system call works fine.
I need to receive a number of raw ethernet packets (say, 100 packets) into a user-mode accessible buffer large enough to hold all the packets. The way I have done this so far is by looping over the recvfrom() system call 100 times, passing an incremented pointer addressing the location in my buffer to store the packet. Is there a way to receive the 100 packets into my buffer with one system call, perhaps by instructing the kernel to DMA the 100 packets into my buffer?
View 1 Replies View RelatedPlease send me the code how to assign ipv6 address using ioctl system call using C.
View 1 Replies View RelatedI am running an embedded Linux Release 2.4.19-uc0.
I have code in several places that calls
reboot(LINUX_REBOOT_CMD_RESTART)
successfully. I need to put it into a new place in a application running on the system. When I do, it seems to just lock up the system and does not return from the call nor leave me able to Telnet in or Ping or anything. I've tried puttingtrace code in to write info out to a file, but that too is not working (as it never returns from the reboot() call.I don't get any error from reboot(), it just does not return and does not appear to restart the system.
I'm working on Linux OS (Suse/redhat) and trying to format a linux partition from a c program. Is there a way to do this without using : 'system ("mkfs.ext4 /dev/sdxy")'
View 4 Replies View Related
