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  • gdb : multithreading

    - by Arpit
    Hi Wish to know that I have a program which uses two threads I have put the break point in both the threads. While running the program under gdb I want to switch between the threads and make them run. (thread t1 is active and running and thread t2 hold on the breakpoint I want to stop T1 running and run the T2) Is there any way that I can schedule the threads in gdb. Thanks Arpit

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  • Understanding how rpmbuild works

    - by ereOn
    Hi, For my work, I have to create a documentation on "How-to create a RPM package on Red Hat 5". I'm used to Debian and it's derivative (Ubuntu, and so on) and thus to Debian packages (aka. .deb files). It seems that the RPM logic is quite different from what I know already and I am having some issues understanding the "RPM logic". From what I read, it seems that ones need to be root to create a RPM package. While I understand why root could be required to install a package, I still don't understand why elevated privileges should be needed to just create one. If I try to create a RPM package as a user, changing the buildroot it fails on the %installstep because I don't have permission to write files into /usr/bin. Fair enough but... why does he want to copy my files into /usr/bin at this step ?! I just want to create the package, not install it ! I'm sure I'm missing something here. Is there anyone who could give me at least a basic understanding of how rpmbuild works and why ? Thank you very much !

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  • Flush kernel's TCP buffer with `MSG_MORE`-flagged packets

    - by timn
    send()'s man page reveals the MSG_MORE flag which is asserted to act like TCP_CORK. I have a wrapper function around send(): int SocketConnection_Write(SocketConnection *this, void *buf, int len) { errno = 0; int sent = send(this->fd, buf, len, MSG_NOSIGNAL); if (errno == EPIPE || errno == ENOTCONN) { throw(exc, &SocketConnection_NotConnectedException); } else if (errno == ECONNRESET) { throw(exc, &SocketConnection_ConnectionResetException); } else if (sent != len) { throw(exc, &SocketConnection_LengthMismatchException); } return sent; } Assuming I want to use the kernel buffer, I could go with TCP_CORK, enable whenever it is necessary and then disable it to flush the buffer. But on the other hand, thereby the need for an additional system call arises. Thus, the usage of MSG_MORE seems more appropriate to me. I'd simply change the above send() line to: int sent = send(this->fd, buf, len, MSG_NOSIGNAL | MSG_MORE); According to lwm.net, packets will be flushed automatically if they are large enough: If an application sets that option on a socket, the kernel will not send out short packets. Instead, it will wait until enough data has shown up to fill a maximum-size packet, then send it. When TCP_CORK is turned off, any remaining data will go out on the wire. But this section only refers to TCP_CORK. Now, what is the proper way to flush MSG_MORE packets? I can only think of two possibilities: Call send() with an empty buffer and without MSG_MORE being set Re-apply the TCP_CORK option as described on this page Unfortunately the whole topic is very poorly documented and I couldn't find much on the Internet. I am also wondering how to check that everything works as expected? Obviously running the server through strace' is not an option. So the only simplest way would be to usenetcat' and then look at its `strace' output? Or will the kernel handle traffic differently transmitted over a loopback interface?

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  • sendmail redhat

    - by lepricon123
    For some reason even after providing the sender's from adress my mails are not being delivered as from is missing as below maillog. Any suggestions? May 8 20:08:43 tawq02 sendmail[13443]: o4938hJD013443: ruleset=check_mail, arg1=<{}, relay=localhost.localdomain [127.0.0.1], reject=553 5.5.4 <{}... Domain name required for sender address {} May 8 20:08:43 tawq02 sendmail[13443]: o4938hJD013443: from=<{}, size=0, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]

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  • How to execute with /bin/false shell

    - by Amar
    I am trying to setup per-user fastcgi scripts that will run each on a different port and with a different user. Here is example of my script: #!/bin/bash BIND=127.0.0.1:9001 USER=user PHP_FCGI_CHILDREN=2 PHP_FCGI_MAX_REQUESTS=10000 etc... However, if I add user with /bin/false (which I want, since this is about to be something like shared hosting and I don't want users to have shell access), the script is run under 1001, 1002 'user' which, as my Google searches showed, might be a security hole. My question is: Is it possible to allow user(s) to execute shell scripts but disable them so they cannot log in via SSH?

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  • Can someone help fix my vimrc config?

    - by alex
    set nohlsearch set ai set bg=dark set showmatch highlight SpecialKey ctermfg=DarkGray set listchars=tab:>-,trail:~ set list autocmd BufRead *.py set smartindent cinwords=if,elif,else,for,while,try,except,finally,def,class set tabstop=4 set shiftwidth=4 set expandtab set autoindent set smartindent syntax on set listchars=tab:>- set listchars+=trail:. set ignorecase set smartcase map <C-t><up> :tabr<cr> map <C-t><down> :tabl<cr> map <C-t><left> :tabp<cr> map <C-t><right> :tabn<cr> map <F1> <Esc> imap <F1> <Esc> set pastetoggle=<F5> This is my vimrc. I want to fix it so that it doesn't show ---- ---- when other people tab. Thank.

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  • Android AVD error after update to 2.3

    - by outcast
    (ubuntu8.0.4+eclipse3.6.1+ADT8.0.1) I update android from(1.5+1.6+2.1+2.2) to 2.3,but I got 1:/home/workaccount/Android/android-sdk-linux_86//tools/emulator: /lib/tls/i686/cmov/libc.so.6: version GLIBC_2.8' not found (required by /home/workaccount/Android/android-sdk-linux_86//tools/emulator) 2:/home/workaccount/Android/android-sdk-linux_86//tools/emulator: /lib/tls/i686/cmov/libc.so.6: versionGLIBC_2.11' not found (required by /home/workaccount/Android/android-sdk-linux_86//tools/emulator) when I start an AVD. All versions can't work now. I delete everything expect eclipse,download adt, AndroidSDK, platform2.3/2.2 ,still error. Heeeelp!!!

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  • Lamp panel::Ubuntu

    - by Yosef
    Hi I just install ubuntu 10.04. I use to use wamp server on windows that have manager panel. Is lamp have such panel, or I have to time manually? Thanks, Yosef

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  • Squid parent cache for text/html only

    - by Salvador
    How do I configure the squid to only request text/html to the parent cache; right now I am using : cache_peer 127.0.0.1 parent 8080 0 no-query no-digest on the second hand I get a lot of direct request that do not use the parent proxy: some queries go like FIRST_UP_PARENT and some like DIRECT, how do I tell the squid to always use parent for text/html BTW .. is a transparent proxy I have tried : cache_peer 127.0.0.1 parent 8080 0 no-query no-digest acl elhtml req_mime_type -i ^text/html$ acl elhtml req_mime_type -i text/html cache_peer_access 127.0.0.1 allow elhtml cache_peer_access 127.0.0.1 deny all and it does not works Thanks in advance for the help.

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  • problem in allocating kernel memory by malloc(),

    - by basu sagar
    Is there any protection provided by kernel? Because when we tried to allocate memory using an malloc(), the kernel allowed to allocated around 124 MB of memory, and when we try to write into it, the kernel crashed. If there was protection of kernel memory area, this wouldn't have happened, I guess.

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  • Opencv python and webcam

    - by Neil Benn
    Hello, I'm working with OpenCV on a beagleboard with ubuntu and OpenCV 1.1 interfaced via Python. I'm trying to set something up to capture a feed from a UVC compatible webcam (logitech C250). I have tested the webcam with luvcview and it works but only if I set the input format to YUV. If I run it in 'normal' mode I am getting back jpeg frames and something - somewhere is not happy! I'm trying to connect with the webcam in OpenCV as I want to get the image back from the webcam and run some analysis on it. As I have a limited device this seems to be the most efficient way of doing it - however I need to instruct the capturing system to capture in YUV and not jpeg. Is there a way of doing this (for example luvcview allow me to enter luvcview -f YUVY)? Cheers, Neil

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  • How do you fix "failed command: IDENTIFY DEVICE" showing up in dmesg?

    - by Neil
    I just got a new Mushkin 60gb SSD, and it's now my primary drive in the ata1 spot. I've been getting these failed command: IDENTIFY DEVICE errors which are preventing rebooting and shutdown. Does anyone know what these could be caused by, or how to start troubleshooting? I've tried these kernels: 2.6.32-22-generic 2.6.31-17-generic And they both have the same error. Here is a link to my entire dmesg. And the relevant ata1.00 parts below: [ 59.804237] ata1: drained 256 bytes to clear DRQ. [ 59.804244] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen [ 59.804249] ata1.00: failed command: IDENTIFY DEVICE [ 59.804254] ata1.00: cmd ec/00:00:00:00:00/00:00:00:00:00/40 tag 0 pio 512 in [ 59.804256] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) [ 59.804258] ata1.00: status: { DRDY } [ 59.804264] ata1: hard resetting link [ 59.804266] ata1: nv: skipping hardreset on occupied port [ 60.272036] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 60.352193] ata1.00: configured for UDMA/133 [ 60.352204] ata1: EH complete

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  • How do I run all my PHPUnit tests?

    - by JJ
    I have script called Script.php and tests for it in Tests/Script.php, but when I run phpunit Tests it does not execute any tests in my test file. How do I run all my tests with phpunit? PHPUnit 3.3.17, PHP 5.2.6-3ubuntu4.2, latest Ubuntu Output: $ phpunit Tests PHPUnit 3.3.17 by Sebastian Bergmann. Time: 0 seconds OK (0 tests, 0 assertions) And here are my script and test files: Script.php <?php function returnsTrue() { return TRUE; } ?> Tests/Script.php <?php require_once 'PHPUnit/Framework.php'; require_once 'Script.php' class TestingOne extends PHPUnit_Framework_TestCase { public function testTrue() { $this->assertEquals(TRUE, returnsTrue()); } public function testFalse() { $this->assertEquals(FALSE, returnsTrue()); } } class TestingTwo extends PHPUnit_Framework_TestCase { public function testTrue() { $this->assertEquals(TRUE, returnsTrue()); } public function testFalse() { $this->assertEquals(FALSE, returnsTrue()); } } ?>

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  • 1 domain.. 2 server and 2 applications

    - by basit.
    i have a site like twitter.com on server one and on server two i have forum, which path is like domain.com/forum on server one i wanted to implement wild card dns and put main domain on it. but on server two i wanted to keep forum separate, i cant give sub-domain forum.domain.com, because all its links are already put in search engines and link back to domain.com/forum. so i was wondering, how can i put domain and wild card dns on server one and still able to give path on server 2 for domain.com/forum (as sub-folder). any ideas? do you think htaccess can do that job? if yes, then how?

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  • converting .doc and .xls file to html on rhel 4 server using php

    - by prateek
    i have a rhel 4 server and use php as a server side scripting language. There are many doc and excel files that are uploaded to the server daily. i make these files to be downloaded. i want to implement the view as html feature and they should preserve the formatting also. so which tools can be used or it can be done through php only. (on php4)

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  • kernelHow to read/write files within kernel module?

    - by Methos
    I know all the discussions about why one should not read/write files from kernel, instead how to use /proc or netlink to do that. I want to read/write anyway. I have also read http://www.linuxjournal.com/article/8110 However, problem is 2.6.30 does not export sys_read(). Rather its wrapped in SYSCALL_DEFINE3. So if I use that in my module, I get following warnings: WARNING: "sys_read" [xxx.ko] undefined! WARNING: "sys_open" [xxx.ko] undefined! Obviously insmod cannot load the module because linking does not happen correctly. Questions: How to read/write within kernel after 2.6.22 (where sys_read()/sys_open() are not exported)? In general, how to use system calls wrapped in macro SYSCALL_DEFINEn() from within the kernel?

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  • php cli script hangs with no messages

    - by julio
    Hi-- I've written a PHP script that runs via SSH and nohup, meant to process records from a database and do stuff with them (eg. process some images, update some rows). It works fine with small loads, up to maybe 10k records. I have some larger datasets that process around 40k records (not a lot, I realize, but it adds up to a lot of work when each record requires the download and processing of up to 50 images). The larger datasets can take days to process. Sometimes I'll see in my debug logs memory errors, which are clear enough-- but sometimes the script just appears to "die" or go zombie on me. My tail of the debug log just stops, with no error messages, the tail of the nohup log ends with no error, and the process is still showing in a ps list, looking like this-- 26075 pts/0 S 745:01 /usr/bin/php ./import.php but no work is getting done. Can anyone give me some ideas on why a process would just quit? The obvious things (like a php script timeout and memory issues) are not a factor, as far as I can tell. Thanks for any tips PS-- this is hosted on a godaddy VDS (not my choice). I am sort of suspecting that godaddy has some kind of limits that might kick in on me despite what overrides I put in the code (such as set_time_limit(0);).

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  • How te execute with /bin/false shell

    - by Amar
    Hello I am trying to setup per-user fastcgi scripts that will run each on different port and with different user. Here is example of my script: #!/bin/bash BIND=127.0.0.1:9001 USER=user PHP_FCGI_CHILDREN=2 PHP_FCGI_MAX_REQUESTS=10000 etc... However, if I add user with /bin/false (which I want, since this is about to be something like shared hosting and I dont want users to have shell access), the script is run'd under 1001, 1002 'user' which, as I googled, might be security hole. My question is: Is it possible to allow user(s) execute shell scripts but disable them to log in via SSH ? Thank you

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  • how does ` cat << EOF` work in bash?

    - by hasen j
    I needed to write a script to enter multi-line input to a program (psql) After a big of googling, I found the following syntax works: cat << EOF | psql ---params BEGIN; `pg_dump ----something` update table .... statement ...; END; EOF This correctly concatenates all these strings and passes the result as an input to psql. but I have no idea how/why it works, can some one please explain? I'm referring mainly to cat << EOF, I know > outputs to a file, >> appends to a file, < reads input from file. What does << exactly do? And is there a man page for it?

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  • How to detect segmentation fault details using Valgrind?

    - by Davit Siradeghyan
    Hi all I have a std::map< std::string, std::string which initialized with some API call. When I'm trying to use this map I'm getting segmentation fault. How can I detect invalid code or what is invalid or any detail which can help me to fix problem? Code looks like this: std::map< std::string, std::string> cont; some_func( cont ); // getting parameter by reference and initialize it std::cout << cont[ "some_key" ] << '\n'; // getting segmentation fault here

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