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  • Arduino wireless options

    - by user541597
    I am currently working on a wireless solution for my arduino and computer. I am trying to connect a Transmitter to my computer and a receiver to my arduino. I have seen a lot of examples with arduino to arduino communication but none for computer to arduino. What would I need to interface the transmitter with my computer, PIC? If anyone can provide any insight or any links it would be greatly appreciated. Thanks,

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  • bash: assign grep regex results to array

    - by Ryan
    Hello everyone, I am trying to assign a regular expression result to an array inside of a bash script but I am unsure whether that's possible, or if I'm doing it entirely wrong. The below is what I want to happen, however I know my syntax is incorrect: indexes[4]=$(echo b5f1e7bfc2439c621353d1ce0629fb8b | grep -o '[a-f0-9]\{8\}') such that: index[1]=b5f1e7bf index[2]=c2439c62 index[3]=1353d1ce index[4]=0629fb8b Any links, or advice, would be wonderful :)

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  • NGINX rewrite for vanity URLs when file doesn't exist (try_files and rewrite together)

    - by user1721724
    I'm trying to get vanity URLs on my server. If the file path from the URL doesn't exist, I want to rewrite the URL to profile.php, but if my users have periods in their usernames, their vanity URL doesn't work. Here is my conf block. server { listen 80; server_name www.example.com; rewrite ^/([a-zA-Z0-9-_]+)$ /profile.php?url=$1 last; root /var/www/html/example.com; error_page 404 = /404.php; location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ { expires 1y; log_not_found off; } location ~ \.php$ { fastcgi_pass example_fast_cgi; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /var/www/html/example.com$fastcgi_script_name; include fastcgi_params; } location / { index index.php index.html index.htm; } location ~ /\.ht { deny all; } location /404.php { internal; return 404; } } Any help would be appreciated. Thanks!

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  • Is there a way to click a link in Firefox and open a file in an existing VIM session?

    - by btelles
    Hi there, I know it's possible to open links in an html page (let's say, if you're using Firefox) with TextMate if the link has this format: <a href="txmt://open?url=file:///home/.../index.html.haml">View</a> But is it possible to do a similar thing with VIM? Perhaps like so: <a href="vim://open?url=file:///home/.../index.html.haml">View</a> Ideally this would use an existing VIM session. Cheers, Bernie

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  • My linux server "Number of processes created" and "Context switches" are growing incredibly fast

    - by Jorge Fuentes González
    I have a strange behaviour in my server :-/. Is a OpenVZ VPS (I think is OpenVZ, because /proc/user_beancounters exists and df -h returns /dev/simfs drive. Also ifconfig returns venet0). When I do cat /proc/stat, I can see how each second about 50-100 processes are created and happens about 800k-1200k context switches! All that info is with the server completely idle, no traffic nor programs running. Top shows 0 load average and 100% idle CPU. I've closed all non-needed services (httpd, mysqld, sendmail, nagios, named...) and the problem still happens. I do ps -ALf each second too and I don't see any changes, only a new ps process is created each time and the PID is just the same as before + 1, so new processes are not created, so I thought that process growing in cat /proc/stat must be threads (Yes, seems that processes in /proc/stat counts threads creation too as this states: http://webcache.googleusercontent.com/search?q=cache:8NLgzKEzHQQJ:www.linuxhowtos.org/System/procstat.htm&hl=es&tbo=d&gl=es&strip=1). I've changed to /proc dir and done cat [PID]\status with all PIDs listed with ls (Including kernel ones) and in any process voluntary_ctxt_switches nor nonvoluntary_ctxt_switches are growing at the same speed as cat /proc/stat does (just a few tens/second), Threads keeps the same also. I've done strace -p PID to all process too so I can see if any process is crating threads or something but the only process that has a bit of movement is ssh and that movement is read/write operations because of the data is sending to my terminal. After that, I've done vmstat -s and saw that forks is growing at the same speed processes in /proc/stat does. As http://linux.die.net/man/2/fork says, each fork() creates a new PID but my server PID is not growing! The last thing I can think of is that all process data that proc/stat and vmstat -s show is shared with all the other VPS stored in the same machine, but I don't know if that is correct... If someone can throw some light on this I would be really grateful.

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  • How can I do a clean Mod_Rewrite that hides the variable numbers passed in the query string but just

    - by Jay Bee
    Hi, I have been developing web applications for a while now. My applications have been fairing poorly in search engine results because of the dynamic links that my websites generate. I admire the way some developers do their mod_rewrite to produce something like: http://www.mycompany.com/accommodation/europe/ to run a substitute of "index.php?category_id=2&country=23" How can I achieve that in my urls? Warm regards, JB

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  • Why use ASP.NET MVC 2 for REST services? Why not WCF?

    - by Jeremy McGee
    So I see that MVC 2 now supports [HttpPut] and [HttpDelete] as well as [HttpGet] and [HttpPost], making it possible to do a full RESTful Web service using it. I've been using the REST toolkit for WCF for a while and find it fairly powerful, but I'd be interested to find out what (if any) advantages there are using the MVC 2 approach. Links, war stories, or even pure hear-say are welcome.

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  • Clarification on signals (sighup), jobs, and the controlling terminal

    - by asolberg
    So I've read two different perspectives and I'm trying to figure out which one is right. 1) Some sources online say that signals sent from the controlling terminal are ONLY sent to the foreground process group. That means if want a process to continue running in the background when you logout it is sufficient to simply suspend the job (ctrl-Z) and resume it in the background (bg). Then you can log out and it will continue to run because SIGHUP is only sent to the foreground job. See: http://blog.nelhage.com/2010/01/a-brief-introduction-to-termios-signaling-and-job-control/ ...In addition, if any signal-generating character is read by a terminal, it generates the appropriate signal to the foreground process group.... 2) Other sources claim you need to use the "nohup" command at the time the program is executed, or failing that, issue a "disown" command during execution to remove it from the jobs table that listens for SIGHUP. They say if you don't do this when you logout your process will also exit even if its running in a background process group. For example: http://docstore.mik.ua/orelly/unix3/upt/ch23_11.htm ...If I log out anyway, the shell sends my background job a HUP signal... In my own experiments with Ubuntu linux it seems like 1) is correct. I executed a command: "sleep 20 &" then logged out, logged back in and pressed did a "ps aux". Sure enough the sleep command was still running. So then why is it that so many people seem to believe number 2? And if all you have to do is place a job in the background to keep it running why do so many people use "nohup" and "disown?"

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  • How does 'binding' in JSF work?

    - by Roman
    I've created custom component which shows chart. Now I need to make binding support for this component i.e. generated chart-image should be available (as array of bytes) to backing bean via binding mechanism. I'd like to know some general info about binding implementation techniques. Any links and examples are welcome as well. Thanks in advance!

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  • nginx: how do I add new site/server_name in nginx?

    - by Neo
    I'm just starting to explore Nginx on my Ubuntu 10.04. I installed Nginx and I'm able to get the "Welcome to Nginx" page on localhost. However I'm not able to add a new server_name, even when I make the changes in site-available/default file. Tried reloading/restarting Nginx, but nothing works. One interesting observation. "http://mycomputername" in browser works. So somehow there is a command like 'server_name $hostname' somewhere over-riding my rule. File: sites-available/mine.enpass server { listen 80; server_name mine.enpass ; access_log /var/log/nginx/localhost.access.log; location / { root /var/www/nginx-default; index index.html index.htm; } } File: nginx.confg user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; # multi_accept on; } http { include /etc/nginx/mime.types; access_log /var/log/nginx/access.log; sendfile on; #tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; tcp_nodelay on; gzip on; gzip_comp_level 2; gzip_proxied any; gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; }

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  • How to use facebook connect with cakephp ?

    - by Harsha M V
    I am trying to integrate facebook connect with my cakephp application. i am not sure how facebook conenct works. can some one guide me over this. or provide me links to some tutorial. is there particular fields that you should have to get the facebook connect to work ?

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  • Debugging into a shared library source from consuming app, using QTCreator

    - by morpheous
    I am using QTCreator (1.3.1) on Ubuntu Karmic. I have built two projects: a shared library an application that links to the shared library I am debugging the application, and need to step into the implementation (i.e. the source) of one of the functions exported by the shared library. Does anyone know how to setup the QTCreator to allow me to step into the source of a shared library?

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  • Python directory list returned to Django template

    - by Shu
    Total Python newb here. I have a images directory and I need to return the names and urls of those files to a django template that I can loop through for links. I know it will be the server path, but I can modify it via JS. I've tried os.walk, but I keep getting empty results.

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  • bin_at in dlmalloc

    - by chunhui
    In glibc malloc.c or dlmalloc It said "repositioning tricks"As in blew, and use this trick in bin_at. bins is a array,the space is allocated when av(struct malloc_state) is allocated.doesn't it? the sizeof(bin[i]) is less then sizeof(struct malloc_chunk*)? Who can describe this trick for me? I can't understand the bin_at macro.why they get the bins address use this method?how it works? Very thanks,and sorry for my poor English. /* To simplify use in double-linked lists, each bin header acts as a malloc_chunk. This avoids special-casing for headers. But to conserve space and improve locality, we allocate only the fd/bk pointers of bins, and then use repositioning tricks to treat these as the fields of a malloc_chunk*. */ typedef struct malloc_chunk* mbinptr; /* addressing -- note that bin_at(0) does not exist */ #define bin_at(m, i) \ (mbinptr) (((char *) &((m)->bins[((i) - 1) * 2])) \ - offsetof (struct malloc_chunk, fd)) The malloc_chunk struct like this: struct malloc_chunk { INTERNAL_SIZE_T prev_size; /* Size of previous chunk (if free). */ INTERNAL_SIZE_T size; /* Size in bytes, including overhead. */ struct malloc_chunk* fd; /* double links -- used only if free. */ struct malloc_chunk* bk; /* Only used for large blocks: pointer to next larger size. */ struct malloc_chunk* fd_nextsize; /* double links -- used only if free. */ struct malloc_chunk* bk_nextsize; }; And the bin type like this: typedef struct malloc_chunk* mbinptr; struct malloc_state { /* Serialize access. */ mutex_t mutex; /* Flags (formerly in max_fast). */ int flags; #if THREAD_STATS /* Statistics for locking. Only used if THREAD_STATS is defined. */ long stat_lock_direct, stat_lock_loop, stat_lock_wait; #endif /* Fastbins */ mfastbinptr fastbinsY[NFASTBINS]; /* Base of the topmost chunk -- not otherwise kept in a bin */ mchunkptr top; /* The remainder from the most recent split of a small request */ mchunkptr last_remainder; /* Normal bins packed as described above */ mchunkptr bins[NBINS * 2 - 2]; /* Bitmap of bins */ unsigned int binmap[BINMAPSIZE]; /* Linked list */ struct malloc_state *next; #ifdef PER_THREAD /* Linked list for free arenas. */ struct malloc_state *next_free; #endif /* Memory allocated from the system in this arena. */ INTERNAL_SIZE_T system_mem; INTERNAL_SIZE_T max_system_mem; };

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  • Create Word/RTF file with table of contents from Java

    - by Glen
    Hi, I want to create a Word or RTF file with a table of contents (with links to each section) from Java. From my understanding, iText & Apache POI do not support generating a table of contents. Some clients of the app still use older versions of Word, so I need a library that supports the older Word doc format. Does anyone know how I can do this? Thanks, Glen

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  • Nginx configuration question

    - by Pockata
    Hey guys, i'm trying to make the autoindex feature only run for my ip address with this code: server{ ... autoindex off; ... if ($remote_addr ~ ..*.*) { autoindex on; } ... } But it doesn't work. It gives my a 403 :/ Can someone help me :) Btw, i'm using Debian Lenny and Nginx 0.6 :) EDIT: Here's my full configuration: server { listen 80; server_name site.com; server_name_in_redirect off; client_max_body_size 4M; server_tokens off; # log_subrequest on; autoindex off; # expires max; error_page 500 502 503 504 /var/www/nginx-default/50x.html; # error_page 404 /404.html; set $myhome /bla/bla; set $myroot $myhome/public; set $mysubd $myhome/subdomains; log_format new_log '$remote_addr - $remote_user [$time_local] $request ' '"$status" "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; # Star nginx :@ access_log /bla/bla/logs/access.log new_log; error_log /bla/bla/logs/error.log; if ($remote_addr ~ 94.156.58.138) { autoindex on; } # Subdomains if ($host ~* (.*)\.site\.org$) { set $myroot $mysubd/$1; } # Static files # location ~* \.(jpg|jpeg|gif|css|png|js|ico)$ { # access_log off; # expires 30d; # } location / { root $myroot; index index.php index.html index.htm; } # PHP location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $myroot$fastcgi_script_name; include fastcgi_params; } # .Htaccess location ~ /\.ht { deny all; } } I forgot to mention that when i add the code to remove static files from my access log, the static files cannot be accessed. I don't know if it's relevant :)

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  • From SEO point of view, is it better to use Domain-Dash.com or Domainwithoutdash.com?

    - by Msc. Adrian Lopez
    I have been reading forums and so, but found not a clear answer or nor conclusive, about the strategic decission of using domain-with-dash.com or notusingdashes.com Is there a problem or disadvantage in ranking for those key words? Is it better having the-domain-with-dash.com than shortdomain.net? many cases you dont have the dot.com available for that specific key word. what are your opinions, please prove facts, or add links to the source. What Google has to say?

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  • arduino emacs development

    - by aaa
    hi. I would like to use emacs as a development environment for arduino programming. If you use emacs to program arduino, can you share some tips or links which you find useful. Is there official (or de facto) emacs mode? Also, am I going to miss something which is in arduino IDE if I use emacs exclusively? thank you .

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  • Why does the rename() syscall prohibit moving a directory that I can't write to a different director

    - by Daniel Papasian
    I am trying to understand why this design decision was made with the rename() syscall in 4.2BSD. There's nothing I'm trying to solve here, just understand the rationale for the behavior itself. 4.2BSD saw the introduction of the rename() syscall for the purpose of allowing atomic renames/moves of files. From 4.3BSD-Reno/src/sys/ufs/ufs_vnops.c: /* * If ".." must be changed (ie the directory gets a new * parent) then the source directory must not be in the * directory heirarchy above the target, as this would * orphan everything below the source directory. Also * the user must have write permission in the source so * as to be able to change "..". We must repeat the call * to namei, as the parent directory is unlocked by the * call to checkpath(). */ if (oldparent != dp->i_number) newparent = dp->i_number; if (doingdirectory && newparent) { VOP_LOCK(fndp->ni_vp); error = ufs_access(fndp->ni_vp, VWRITE, tndp->ni_cred); VOP_UNLOCK(fndp->ni_vp); So clearly this check was added intentionally. My question is - why? Is this behavior supposed to be intuitive? The effect of this is that one cannot move a directory (located in a directory that one can write) that one cannot write to another directory that one can write to atomically. You can, however, create a new directory, move the links over (assuming one has read access to the directory), and then remove one's write bit on the directory. You just can't do so atomically. % cd /tmp % mkdir stackoverflow-question % cd stackoverflow-question % mkdir directory-1 % mkdir directory-2 % mkdir directory-1/directory-i-cant-write % echo "foo" > directory-1/directory-i-cant-write/contents % chmod 000 directory-1/directory-i-cant-write/contents % chmod 000 directory-1/directory-i-cant-write % mv directory-1/directory-i-cant-write directory-2 mv: rename directory-1/directory-i-cant-write to directory-2/directory-i-cant-write: Permission denied We now have a directory I can't write with contents I can't read that I can't move atomically. I can, however, achieve the same effect non-atomically by changing permissions, making the new directory, using ln to create the new links, and changing permissions. (Left as an exercise to the reader) . and .. are special cased already, so I don't particularly buy that it is intuitive that if I can't write a directory I can't "change .." which is what the source suggests. Is there any reason for this besides it being the perceived correct behavior by the author of the code? Is there anything bad that can happen if we let people atomically move directories (that they can't write) between directories that they can write?

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  • PHP Video Editing and Streaming

    - by Gaurav Padia
    Hi, I am developing online video streaming website on PHP. I need two functionalities: Need to add title/text at bottom of the video dynamically. Need to add background music to video dynamically. Is it possible with PHP or any available open source library? Can anyone guide me or provide links to this type of library ? Thanks.

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