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  • Why can't a bind linux service to the loop-back only?

    - by Jon Trauntvein
    I am writing a server application that will provide a service on an ephemeral port that I only want accessible on the loopback interface. In order to do this, I am writing code like the following: struct sockaddr_in bind_addr; memset(&bind_addr,0,sizeof(bind_addr)); bind_addr.sin_family = AF_INET; bind_addr.sin_port = 0; bind_addr.sin_addr.s_addr = htonl(inet_addr("127.0.0.1")); rcd = ::bind( socket_handle, reinterpret_cast<struct sockaddr *>(&bind_addr), sizeof(bind_addr)); The return value for this call to bind() is -1 and the value of errno is 99 (Cannot assign requested address). Is this failing because inet_addr() already returns its result in network order or is there some other reason?

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  • Is there a way to inspect the current rpath on Linux?

    - by Justicle
    I'm aware that it is possible to use 'readelf -d | grep RPATH' to inspect a given binary from the shell, but is it possible to do this within a process? Something like (my completely made up system call): /* get a copy of current rpath into buffer */ sys_get_current_rpath(&buffer); I'm trying to diagnose some suspect SO linking issues in our codebase, and would like to inspect the RPATH this way if possible (I'd rather not have to spawn an external script).

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  • Why do virtual memory addresses for linux binaries start at 0x8048000?

    - by muteW
    Disassembling an ELF binary on a Ubuntu x86 system I couldn't help but notice that the code(.text) section starts from the virtual address 0x8048000 and all lower memory addresses seem to be unused. This seems to be rather wasteful and all Google turns up is either folklore involving STACK_TOP or protection against null-pointer dereferences. The latter case looks like it can be fixed by using a single page instead of leaving a 128MB gap. So my question is this - is there a definitive answer to why the layout has been fixed to these values or is it just an arbitrary choice?

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  • Best practice for C++ audio capture API under Linux?

    - by braddock
    I need to create a C++ application with a simple audio recording from microphone functionality. I can't say that there aren't enough audio APIs to do this! Pulse, ALSA, /dev/dsp, OpenAL, etc. My question is what is the current "Best practice" API? Pulse seems supported by most modern distros, but seems almost devoid of documentation. Will OpenAL be supported across different distros, or is it too obscure? Have I missed any? Is there not a simple answer? thanks!

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  • How can I convert spaces to tabs in Vim or Linux?

    - by cwd
    I've looked over several questions on Stack Overflow for how to convert spaces to tabs without finding what I need. There seem to be more questions about how to convert tabs to spaces, but I'm trying to do the opposite. In Vim I've tried :retab and :retab! without luck, but I believe those are actually for going from tabs to spaces anyways. I tried both expand and unexpand at the command prompt without any luck. Here is the file in question: http://gdata-python-client.googlecode.com/hg-history/a9ed9edefd61a0ba0e18c43e448472051821003a/samples/docs/docs_v3_example.py How can I convert leading spaces to tabs using either Vim or the shell?

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  • Running commands though PHP/Perl scripts as a priviledged user on Linux.

    - by jtd
    Background: I am writing a script for a company that will allow users to create FTP accounts through a web interface. In the background, the script must run a bunch of commands: Add the user to the system (useradd) Open and edit various files mail the user via sendmail and a few other things... I'm basically looking for the most secure way of doing this. I've heard of the setuid method, the sudo method, and of course, running httpd as a priviledged user. There will be sanity checks on the data entered of course before any commands are executed (ie. only alphanumeric characters in usernames) What is the method used by the popular scripts out there (webmin for example), as it must be fairly secure?

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  • Linux: Find all symlinks of a given 'original' file? (reverse 'readlink')

    - by sdaau
    Hi all, Consider the following command line snippet: $ cd /tmp/ $ mkdir dirA $ mkdir dirB $ echo "the contents of the 'original' file" > orig.file $ ls -la orig.file -rw-r--r-- 1 $USER $USER 36 2010-12-26 00:57 orig.file # create symlinks in dirA and dirB that point to /tmp/orig.file: $ ln -s $(pwd)/orig.file $(pwd)/dirA/ $ ln -s $(pwd)/orig.file $(pwd)/dirB/lorig.file $ ls -la dirA/ dirB/ dirA/: total 44 drwxr-xr-x 2 $USER $USER 4096 2010-12-26 00:57 . drwxrwxrwt 20 root root 36864 2010-12-26 00:57 .. lrwxrwxrwx 1 $USER $USER 14 2010-12-26 00:57 orig.file -> /tmp/orig.file dirB/: total 44 drwxr-xr-x 2 $USER $USER 4096 2010-12-26 00:58 . drwxrwxrwt 20 root root 36864 2010-12-26 00:57 .. lrwxrwxrwx 1 $USER $USER 14 2010-12-26 00:58 lorig.file -> /tmp/orig.file At this point, I can use readling to see what is the 'original' (well, I guess the usual term here is either 'target' or 'source', but those in my mind can be opposite concepts as well, so I'll just call it 'original') file of the symlinks, i.e. $ readlink -f dirA/orig.file /tmp/orig.file $ readlink -f dirB/lorig.file /tmp/orig.file ... However, what I'd like to know is - is there a command I could run on the 'original' file, and find all the symlinks that point to it? In other words, something like (pseudo): $ getsymlinks /tmp/orig.file /tmp/dirA/orig.file /tmp/dirB/lorig.file Thanks in advance for any comments, Cheers!

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  • How can I do a 'where' clause in Linux shell?

    - by Hoa
    I have a CSV file and I would like to filter all the lines where the 19th column has two or more characters. I know the individual pieces but can't figure out how to glue them together. First I have to cat the file. The following prints the 19th column awk -F "," '{print $19}' file.txt awk also has length and ifs And I know it all has to be glued together using pipes. I'm just getting stuck at the exact syntax since I have not done much bash programming before.

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  • Linux How to print all the files with the same prefix after searching for them?

    - by Alyx
    I need to search through a directory which contains many sub directories, each which contain files. The files read as follows question1234_01, where 1234 are random digits and the suffix _01 is the number of messages that contain the prefix, meaning they are apart of the same continuing thread. find . -name 'quest*' | cut -d_ -f1 | awk '{print $1}' | uniq -c | sort -n example output: 1 quest1234 10 quest1523 This searches for all the files then sorts them in order. What I want to do is print all the files which end up having the most occurrences, in my example the one with 10 matches. So it should only output quest1523_01 - 11

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  • How to set baud rate to 307200 on Linux?

    - by cairol
    Basically I'm using the following code to set the baud rate of a serial port: struct termios options; tcgetattr(fd, &options); cfsetispeed(&options, B115200); cfsetospeed(&options, B115200); tcsetattr(fd, TCSANOW, &options); This works very well. But know I have to communicate with a device that uses a baud rate of 307200. How can I set that? cfsetispeed(&options, B307200); doesn't work, there is no B307200 defined.

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  • How to restart Linux from inside a C++ program?

    - by Dave K
    I have a Qt 4 GUI where I need to have a option in a drop-down menu that allows the user to choose to restart the computer. I realize this might seem redunant with the ability to restart the computer in other ways, but the choice needs to stay there. I've tried using system() to call the following: a suid-root shell script a non-suid shell script a suid-root binary program and all of them just cause reboot: must be superuser to be printed. Using system() to call reboot directly does the same thing. I'm not especially attached to using system() to do this, but it seemed like the most direct choice. How can I reboot the system from the GUI?

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  • How to controll (and emulate) monitor/projector on Linux?

    - by klew
    I would like to write some C/C++ program to controll monitor/projector attached to my computer. I've googled around, but I couldn't find almost anything that would lead me in some direction. Do you know where I can learn about it? What I would like to do is to write "Hello world" on an external monitor. It would be also nice to have some "monitor emulator" that will act as physicaly attached monitor (or to write program to emulate it). I'm not sure if it is possible. I couldn't find anything like this. I'm working on Ubuntu 9.10 with Gnome.

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  • How can I modify the application file of an application that is currently running (on Linux)?

    - by Hach-Que
    I have an application running called AppFS. This application has an ext2 filesystem just attached to the end of the file (it's positioned so that the application binary exists in a 1MB spacing area, followed by the ext2 data). Now I've got FUSE embedded in the program and I've managed to extract the filesystem out of the application data into a temporary file so that FUSE can mount / use it. The problem I have now is writing the temporary file back into the application file. I get "Text file busy" presumably because the application has locked itself and won't let writes occur. Is there a way I can force the file to become unlocked so I can write data to it? (It's important to note that I'm not changing the application binary area - just rewriting the ext2 component.) It needs to be unlocked without requiring root permissions (unlocked by the same user who started the application).

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  • How to read system information in C++ on Windows and Linux?

    - by f4
    I need to read system information like CPU/RAM/disks usage in C++. Maybe swap, network and process too but that's less important. It has probably been done thousand of times before so I first tried to search for a library. Someone here suggested SIGAR, which seems to fit my needs but it has a GPL license and it is for inclusion in a proprietary product. So it's not an option here. I feel like it's something not that easy to implement, as it'll need testing on several platforms. So a library would be welcome. If you don't know of any library, could you point me in the right direction for both platforms?

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  • Linux rpm installs but cannot erase. Why?

    - by rmosley
    My Perl code installed several (4) rpm files as root. the next install removes them (rpm -e) before installing a newer version. One does not remove, with rpm -e giving the error that it is not installed. However, later when the updated file is installed, the message is given that it is already installed. Manual attempts to remove give the same results. My questions are how to force removal something from the rpm database, and why does this contradication exist (not installed from rpm -e and already installed from rpm -Uvh and rpm -ivh)?

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  • Difference between the address space of parent process and its child process in Linux?

    - by abbas1707
    Hi, I am confused about it. I have read that when a child is created by a parent process, child gets a copy of its parent's address space. What it means here by copy? If i use code below, then it prints same addresses of variable 'a' which is on heap in all cases. i.e in case of child and parent. So what is happening here? #include <sys/types.h> #include <stdio.h> #include <unistd.h> #include <stdlib.h> int main () { pid_t pid; int *a = (int *)malloc(4); printf ("heap pointer %p\n", a); pid = fork(); if (pid < 0) { fprintf (stderr, "Fork Failed"); exit(-1); } else if (pid == 0) { printf ("Child\n"); printf ("in child heap pointer %p\n", a); } else { wait (NULL); printf ("Child Complete\n"); printf ("in parent heap pointer %p\n", a); exit(0); } }

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  • Is there a (Linux) C++ IDE that can 'construct' a project from a makefile?

    - by Paul
    I am working on a legacy C app which uses makefiles. I am more comfortable (and more productive) working from within an IDE, so I am looking for an IDE that can import the makefile and create a project. Incidentally, these are hand written makefiles (not complicated ones like those generated by Autoconf). I am using Code::Blocks at the moment, but it seems it is unable to import makefiles ...

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  • How to programatically set a permanent environment variable in Linux?

    - by Richard
    I am writing a little install script for some software. All it does is unpack a target tar, and then i want to permanently set some environment variables - principally the location of the unpacked libs and updating $PATH. Do I need to programmatically edit the .bashrc file, adding the appropriate entries to the end for example, or is there another way? What's standard practice? Edit: The package includes a number of run scripts (20+) that all use these named environment variables, so I need to set them somehow (the variable names have been chosen such that a collision is extremely unlikely)

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  • How do I manage a Python based daemon on Linux?

    - by BCS
    I have a working Python based program that I want to run as a daemon. Currently I'm doing it in a very hackish manner of starting it in with screen-d -m name session and killing it with pkill -f name. Eventually I'm doing to have to move this to the better system we use here (thus I don't want to modify the program) but in the interim, I'm looking for a cleaner way to do this. My current thinking is kick it off as a background task from an inti.d script but how do I bring it back down?

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  • Will the program installed in a folder function properly if I remove the write permission in linux? [on hold]

    - by Kevin Powell
    I have a user account on a cluster( a server), and can only install program like python on the home folder. In case I might accidentally delete the bin, lib, share,include folders coming with the installation of python on the home folder. I change the permissions of the above folder like this chmod -w folder but I am worried when the program need to write/delete some files of the folders, it might not function because the removal of write permission. Am I right? or I the run, including write files in the folder, of a program have permissions different than the permission of user. BTW, is there a way to hide the folders without changing the names?

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  • FFmpeg Video Hosting for Linux and Windows Server

    - by Aditi
    FFmpeg hosting is a special type of web hosting where the host servers have video transcoding software loaded on them, which allows the automatic conversion of videos from one format to another. FFmpeg is a cross-platform solution for recording, converting, transcoding and stream audio and video. It includes libavcodec – the leading audio/video codec library. FFmpeg hosting gets its name from a set of server side programs (modules) called FFmpeg. There are a number of applications or web scripts available, which allow webmasters to create their own video sharing websites. Video hosting typically requires: PHP 4.3 and above (including support of CLI) Mencoder and also Mplayer FFMpeg-PHP MySQL database server LAME MP3 Encoder Libogg + Libvorbis GD Library 2 or higher CGI-BIN There are number of web service providers who provide FFmpeg hosting service. Following is a list of some of the Best FFmpeg hosting providers for both Linux and Windows Server below. Dream Host Dreamhost provides for web based email access, mail filtering, spam filtering, unlimited email ids, vacation autoresponder, python support, full CGI access and many more services. Price: $7.95 View Details Micfo It offers unlimited disk space and bandwidth. Other services include free domain for life and free Website Transfer with many more services. All in all one of the best option to consider. Price: $5 View Details Host Upon HostUpon offers FFMpeg Hosting on all their hosting packages, with readily installed modules to start a Video website or Social Network with Video uploading. These scripts such as Boonex Dolphin / PHPMotion / Social Engine / ABKsoft Scripts / Joomla Video Plugin / Clipshare / ClipBucket / Social Media / Rayzz / Vidi Script work with their ffmpeg. Their FFMPEG hosting plan offers 24/7/365 support with typical response time of 15min or less. Price: $5.95 View Details DownTown Host DownTown Host provides full and exceptional support by live chat and telephone. It has high-power, modern servers and the finest web server technology. It offers free search engine Submission and continuous data backup protection with free email forwarding and site move. There are many more services too. Site5 This ffmpeg service provider offers uptime guarantee, a real time stats on each server and many more attractive services. Price: $4.95 View Details Cirtex Hosting Cirtex Hosting allows to host 7 websites & domains and provides for unlimited storage space and monthly bandwidth. It also offers FTP and email accounts and many more services. Price: $2.49 View Details FLV Hosting FLV hosting supplies RTMP SERVER STREAMING for large size video streaming and server side recording. It is flexible and costs less. They customize to the clients requirements. Price: $9.95 View Details AptHost This hosting service provides for 24x7x365 Premium Support and fully ffmpeg enabled services. Price: $4.95 View Details HostMDS Great Support, Priced Low. It provides for SSH access, CGI, Ruby on Rails, Perl, PHP, MySQL, front page extentions, 24/7 Support, FREE Domain transfer and spam filtering. It offers instant account setup, low latency fast bandwidth & much more! They were formerly known as Vistapages. Price: $4.95 View Details Related posts:Best WordPress Video Themes for a Video Blog Free Web Based Applications 24+ Coda Alternatives for Windows and Linux

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