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• Default input and output buffering for fopen'd files?

  - by Evan Teran

  So a FILE stream can have both input and output buffers. You can adjust the output stream using setvbuf (I am unaware of any method to play with the input buffer size and behavior). Also, by default the buffer is BUFSIZ (not sure if this is a POSIX or C thing). It is very clear what this means for stdin/stdout/stderr, but what are the defaults for newly opened files? Are they buffered for both input and output? Or perhaps just one? If it is buffered, does output default to block or line mode?

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• NSBitmapImageRep data Format as application icon image??

  - by Joe

  i have a char* array of data that was in RGBA and then moved to ARGB Bottom line is the set application image looks totally messed up and i cant put my finger on why? //create a bitmap representation of the image data. //The data is expected to be unsigned char** NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes : (unsigned char**) &dest pixelsWide:width pixelsHigh:height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:NO colorSpaceName:NSDeviceRGBColorSpace bitmapFormat:NSAlphaFirstBitmapFormat bytesPerRow: 0 bitsPerPixel:0 ]; NSImage *image = [[NSImage alloc] initWithSize:NSMakeSize(width, height)]; [image addRepresentation:bitmap]; if( image == NULL) { printf("image is null\n"); fflush(stdout); } [NSApp setApplicationIconImage :image]; What in these values is off? the image looks very multicolored and pixelated, with transparent parts/lines as well.

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• what does the '~' mean in python?

  - by hidroto

  what does the '~' mean in python? i found this BF interpreter in python a while ago. import sys #c,i,r,p=0,0,[0]*255,raw_input() c=0 i=0 p=raw_input() r=[0]*255 while c<len(p): m,n,u=p[c],0,r[i] if m==">":i+=1 if m=="<":i-=1 if m=="+":r[i]+=1 if m=="-":r[i]-=1 if m==".":sys.stdout.write(chr(u)) if m=="[": if ~u: while 1: m=p[c] if m=="]":n-=1 if m=="[":n+=1 if ~n:break c+=1 if m=="]": if u: while 1: m=p[c] if m=="]":n-=1 if m=="[":n+=1 if ~n:break c-=1 c+=1 and i want to know what it does because i want to make one on my ti 84 (and a PF one) BF is http://en.wikipedia.org/wiki/Brainfuck and PF is something similar

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• Why is Log4j rootLogger not filtering log events according to event level?

  - by Derek Mahar

  Why is the Log4j rootLogger in my application not filtering log events according to level? In my log4j.properties, I have several loggers: log4j.rootLogger=info,stdout log4j.logger.com.name.myapp=debug,myapp log4j.logger.org.castor=debug,castor log4j.logger.org.exolab.castor=debug,castor log4j.logger.org.hibernate=debug,hibernate log4j.logger.org.springframework=debug,spring Each of the loggers receive and record numerous log events at levels DEBUG and above, which is what I expect. The rootLogger, however, despite being set to level INFO, is displaying all of these events, too, including the DEBUG events, which is not what I expect. Instead, I would expect it to filter the DEBUG events, but display only the events at level INFO and higher (WARN, ERROR, and FATAL). Why is rootLogger displaying all of the events?

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• PHP: How To call Standard Library Functions

  - by Andi

  Hi, I'm starting with PHP for dynamic web pages. I have some libaries written in ANSI C for getting/setting parameters and other proprietary stuff. I wonder, is there a simple solution to use a wrapper inside PHP to call this funtions? Is there a already existing class/library? What would be the best practice to do this on my own? I don't want do make calls to external applications and use stdin/stdout! Is there a simple example available? I don't want to dig through the Zend documentation for now, I only need a feeling for the complexity. Thanks, kind regards, Andi

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• Cucumber - How configure it to use "--format pretty" as default?

  - by Gabriel L. Oliveira

  I'm starting learning rails, and having some troubles on configure cucumber to run my bdd tests. What I want is run cucumber features and this translate to cucumber features --format pretty I tried to do this editing the config/cucumber.yml file (on a rails project). Edited the line: default: <%= std_opts % features resulting on: default: <%= std_opts % --format pretty features But it make some erros happen: Using the default profile... All but one formatter must use --out, only one can print to each stream (or STDOUT) (RuntimeError) What I can do to make this option "--format pretty" default? Also, is there any other good option to put as default to make result more clear? Thank you.

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• Better way to make a bash script self-tracing?

  - by Kevin Little

  I have certain critical bash scripts that are invoked by code I don't control, and where I can't see their console output. I want a complete trace of what these scripts did for later analysis. To do this I want to make each script self-tracing. Here is what I am currently doing: #!/bin/bash # if last arg is not '_worker_', relaunch with stdout and stderr # redirected to my log file... if [[ "$BASH_ARGV" != "_worker_" ]]; then $0 "$@" _worker_ >>/some_log_file 2>&1 # add tee if console output wanted exit $? fi # rest of script follows... Is there a better, cleaner way to do this?

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• Can I get a faster output pipe than /dev/null ?

  - by naugtur

  Hi I am running a huge task [automated translation scripted with perl + database etc.] to run for about 2 weeks non-stop. While thinking how to speed it up I saw that the translator outputs everything (all translated sentences, all info on the way) to STDOUT all the time. This makes it work visibly slower when I get the output on the console. I obviously piped the output to /dev/null, but then I thought "could there be something even faster?" It's so much output that it'd really make a difference. And that's the question I'm asking You, because as far as I know there is nothing faster... (But I'm far from being a guru having used linux on a daily basis only last 3 years)

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• MPI C fprintf() output not showing up if the process hangs on MPI_Recv

  - by Karolis

  I'm writing an MPI C program. I have troubles debugging it, because whenever I use fprintf, like this: fprintf(stdout, "worker: %d", worker); if the program hangs, because of some blocking MPI_Recv, I can't see any output. I'm sure the line of code is reached, because I can put a return statement after the fprintf statement, in which case the process finishes execution and the output is printed. Any ideas, on how to print (see the output) even though the process gets blocked later by Recv? I hope this makes sense.

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• Configuration for log4j to log ERROR level to a DB table

  - by firnnauriel

  Using the default config of a fresh Grails project, how do i change it so that ONLY error level messages will go to 'Message' table? // log4j configuration log4j = { // Example of changing the log pattern for the default console // appender: // //appenders { // console name:'stdout', layout:pattern(conversionPattern: '%c{2} %m%n') //} error 'org.codehaus.groovy.grails.web.servlet', // controllers 'org.codehaus.groovy.grails.web.pages', // GSP 'org.codehaus.groovy.grails.web.sitemesh', // layouts 'org.codehaus.groovy.grails.web.mapping.filter', // URL mapping 'org.codehaus.groovy.grails.web.mapping', // URL mapping 'org.codehaus.groovy.grails.commons', // core / classloading 'org.codehaus.groovy.grails.plugins', // plugins 'org.codehaus.groovy.grails.orm.hibernate', // hibernate integration 'org.springframework', 'org.hibernate', 'net.sf.ehcache.hibernate' warn 'org.mortbay.log' } Thanks for any leads on this.

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• What's the proper way to fork() in FastCGI ?

  - by eugene y

  I have an app running under Catalyst+FastCGI. And I want it to fork() to do some work in background. I used this code for plain CGI long ago: defined(my $pid = fork) or die "Can't fork: $!"; if ($pid) { # print response exit 0; } die "Can't start a new session: $!" if setsid == -1; close STDIN or die $!; close STDOUT or die $!; close STDERR or die $!; # do some work in background I tried some variations on this under FastCGI but with no success. How should forking be done under FastCGI?

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• NSView -(void)keyDown in console program

  - by Jonas Byström

  I'm not getting the -(void)keyDown callback on my inherited NSOpenGLView (note that mouseMoved does not work either though I do setAcceptsMouseMovedEvents:YES, but that is not an issue yet). It implements - (BOOL)acceptsFirstResponder { return YES; } but still no luck. My knowledgeable friend implied that it might have something to do with that the application is still a console application and not a bundled .app (I'm currently porting it). If so: is there some way to circumvent? Could the cause be something else? When I terminate my console application, I frequently see all my keypresses go to stdout so it does seem reasonable...

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• Ending tail -f started in a shell script

  - by rangalo

  I have the following. A Java process writing logs to the stdout A shell script starting the Java process Another shell script which executes the previous one and redirects the log I check the log file with the tail -f command for the success message. Even if I have exit 0 in the code I cannot end the tail -f process. Which doesn't let my script to finish. Is there any other way of doing this in Bash? The code looks like the following. function startServer() { touch logfile startJavaprocess > logfile & tail -f logfile | while read line do if echo $line | grep -q 'Started'; then echo 'Server Started' exit 0 fi done }

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• IO redirect engine with metadata

  - by hawk.hsieh

  Is there any C library or tool to redirect IO and be able to configured by a metadata. And provide a dynamic link library to perform custom process for feeding data into next IO. For example, network video recorder: record video: socket do_something() file preview video: socket do_something() PCI device http service: download file: socket do_something(http) file socket post file: socket do_something(http) file serial control: monitor device: uart do_something(custom protocol) popen("zip") socket I know the unix-like OS has IO redirect feature and integrate all application you want. Even socket IO you can use /dev/tcp or implement a process to redirect to stdout. But this is process based , the process's foot print is big , IPC is heavy. Therefore, I am looking for something to redirect IO in a process and the data redirect between IO is configurable with a metadata (XML,jason or others).

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• Ruby class variable is reset after rails app initialized

  - by Phuong Nguy?n

  I tried to assign a class static variable like this class QueryLogger < Logger @@query_logger_default_instance = nil def self.default_instance # Use global variable because static variable doesn't work @@query_logger_default_instance ||= self.new(STDOUT) end end In initializers folder of my rails app, I added a file with this code block ActiveRecord::Base.logger = QueryLogger.default_instance In a request (action of controller), I make a call to this: QueryLogger.default_instance. My assumption is that the call to default_instance will always report the same. However, it does not. Now I try to watch stuff in NetBeans by setting breakpoint inside default_instance. Thing happen as expected, the default_instance get called twice, one due to the initializer block and one due to the call to my action. Surprising thing is, in both times, @@query_logger_default_instance report nil inside NetBeans inspector. The first nil report is correct, but the second shocked me. It's look like static variable gets reset after rails app initialized. Is there some magic there?

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• erlang io:format, and a hanging web application

  - by williamstw

  While I'm learning a new language, I'll typically put lots of silly println's to see what values are where at specific times. It usually suffices because the languages typically have available a tostring equivalent. In trying that same approach with erlang, my webapp just "hangs" when there's a value attempted to be printed that's not a list. This happens when variable being printed is a tuple instead of a list. There's no error, exception, nothing... just doesn't respond. Now, I'm muddling through by being careful about what I'm writing out and as I learn more, things are getting better. But I wonder, is there a way to more reliably to [blindly] print a value to stdout? Thanks, --tim

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• Python interpreter invocation with "-c" and indentation issues

  - by alexander

  I'm trying to invoke Python using the "-c" argument to allow me to run some arbitrary python code easily, like this: python.exe -c "for idx in range(10): print idx" Now this code works fine, from within my batch file, however, I'm running into problems when I want to do anything more than this. Consider the following Python code: foo = 'bar' for idx in range(10): print idx this would then give you 0-9 on the stdout. However, if I collapse this into a single line, using semicolons as delimiters, to get the following: foo = 'bar';for idx in range(10): print idx and try to run it using python.exe -c it get a SyntaxError raised: C:\Python>python.exe -c "foo = 'bar';for idx in range(10): print idx" File "<string>", line 1 foo = 'bar';for idx in range(10): print idx ^ SyntaxError: invalid syntax Anyone know how I can actually use this without switching to a separate .py file?

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• OpenOffice Calc Macro: Run shell command and return output as result of custom function

  - by Mark

  I would like to write a custom OpenOffice function that runs a shell command and puts the result into the cell from which it was invoked. I have a basic macro working, but I can't find a way to capture the command's output. Function MyTest( c1 ) MyTest = Shell("bash -c "" echo hello "" ") End Function The above always returns 0. Looking at the documentation of the Shell command, I don't think it actually returns STDOUT. How would I capture the output so that I can return it in my function? Thanks!

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• How to debug Perl program sudden exits?

  - by taw

  I have Perl program based on io::async, and it sometimes just exits after a few hours/days without printing any error message whatsoever. There's nothing in dmesg or /var/log either. STDOUT/STDERR are both autoflush(1) so data shouldn't be lost in buffers. It doesn't actually exit from IO::Async::Loop->loop_forever - print I put there just to make sure of that never gets triggered. Now one way would be to keep peppering the program with more and more prints and hope one of them gives me some clue. Is there better way to get information what was going on in a program that made it exit/silently crash?

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• Generating code at compile-time using scripts

  - by Manux

  Hello, I would ideally like to be able to add (very repetitive) C/C++ code to my actual code, but at compile time, code which would come from say, the stdout of a python script, the same way one does with macros. For example, let's say I want to have functions that depend on the public attributes of a given class, being able to just write the following in my C++ code would be a blessing: generate_boring_functions(FooBarClass,"FooBarClass.cpp") Is that feasible using conventional means? Or must I hack with Makefiles and temporary source files? Thanks.

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• Diagonal Output of Assembly programe

  - by Yousuf Umar

  i have this assembly programe and i want to diagonal ouptut of this programe but i dont know how to put tabspace in assembly section .text global _start ;must be declared for using gcc _start: ;tell linker entry point mov edx, len ;message length mov ecx, msg ;message to write mov ebx, 1 ;file descriptor (stdout) mov eax, 4 ;system call number (sys_write) int 0x80 ;call kernel mov eax, 1 ;system call number (sys_exit) int 0x80 ;call kernel section .data msg db 'Y',10,'O',10,'U',10,'S',10,'U',10,'F' ;our dear string len equ $ - msg ;length of our dear string output of my programe is Y O U S U F output shoud like this Y O U S U F or is there any other way to write this programe and get this output

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• Is it possible to run php exec through cygwin?

  - by Scarface

  Hey guys I have one command that works on my remote linux server but not my windows (WAMP package) local server. I really want to create an identical workstation so I can test locally and then update my remote server. If anyone has any suggestions or solutions other than converting to linux, I would really appreciate it. <?php $safe_path = escapeshellarg('fake-virus.txt'); $command = '/usr/bin/clamscan --stdout ' . $safe_path; $out = ''; $int = -1; exec($command, $out, $int); echo $int; if ($int == 0) { // all good; } else { echo 'o no';// VIRUS!; } ?>

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• Segmentation fault when using files C++

  - by Popa Mihai

  I am using ubuntu 12.04. I have been trying a few IDE's for simple C++ school projects. However, with codelite, anjuta and kdevelop I encountered a problem: when I am trying to read / write in files I get segmentation fault: core dumped. I am using a basic source: #include<stdio.h> FILE*f=fopen("test.in","r"); FILE*g=fopen("test.out","w"); int main () { int a,b; fscanf(f,"%d %d",&a,&b); fprintf(g,"%d\n",a+b); fclose(f); fclose(g); return 0; } I have to say that programs with stdin/stdout work well. Thank you,

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• Can you make a python script behave differently when imported than when run directly?

  - by futuraprime

  I often have to write data parsing scripts, and I'd like to be able to run them in two different ways: as a module and as a standalone script. So, for example: def parseData(filename): # data parsing code here return data def HypotheticalCommandLineOnlyHappyMagicFunction(): print json.dumps(parseData(sys.argv[1]), indent=4) the idea here being that in another python script I can call import dataparser and have access to dataParser.parseData in my script, or on the command line I can just run python dataparser.py and it would run my HypotheticalCommandLineOnlyHappyMagicFunction and shunt the data as json to stdout. Is there a way to do this in python?

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• mutliprocessing.Pool.add_sync() eating up memory

  - by Austin

  I want to use multithreading to make my script faster... I'm still new to this. The Python doc assumes you already understand threading and what-not. So... I have code that looks like this from itertools import izip from multiprocessing import Pool p = Pool() for i, j in izip(hugeseta, hugesetb): p.apply_async(number_crunching, (i, j)) Which gives me great speed! However, hugeseta and hugesetb are really huge. Pool keeps all of the _i_s and _j_s in memory after they've finished their job (basically, print output to stdout). Is there any to del i, and j after they complete?

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