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  • who free's setvbuf buffer?

    - by Evan Teran
    So I've been digging into how the stdio portion of libc is implemented and I've come across another question. Looking at man setvbuf I see the following: When the first I/O operation occurs on a file, malloc(3) is called, and a buffer is obtained. This makes sense, your program should have a malloc in it for I/O unless you actually use it. My gut reaction to this is that libc will clean up its own mess here. Which I can only assume it does because valgrind reports no memory leaks (they could of course do something dirty and not allocate it via malloc directly... but we'll assume that it literally uses malloc for now). But, you can specify your own buffer too... int main() { char *p = malloc(100); setvbuf(stdio, p, _IOFBF, 100); puts("hello world"); } Oh no, memory leak! valgrind confirms it. So it seems that whenever stdio allocates a buffer on its own, it will get deleted automatically (at the latest on program exit, but perhaps on stream close). But if you specify the buffer explicitly, then you must clean it up yourself. There is a catch though. The man page also says this: You must make sure that the space that buf points to still exists by the time stream is closed, which also happens at program termination. For example, the following is invalid: Now this is getting interesting for the standard streams. How would one properly clean up a manually allocated buffer for them, since they are closed in program termination? I could imagine a "clean this up when I close flag" inside the file struct, but it get hairy because if I read this right doing something like this: setvbuf(stdio, 0, _IOFBF, 100); printf("hello "); setvbuf(stdio, 0, _IOLBF, 100); printf("world\n"); would cause 2 allocations by the standard library because of this sentence: If the argument buf is NULL, only the mode is affected; a new buffer will be allocated on the next read or write operation.

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  • COM Local Server

    - by Gamer
    Hi, Similar to LocalServer32, which is used to specify the path to a 32Bit Local COM server, is there any registry entry for specifying the path to a 64Bit Local COM Server? If there is none, can we use LocalServer32 for 64Bit servers also? Note: In my knowledge there are only 2 registry entries - LocalServer and LocalServer32. According to MSDN the former is used for registering 16bit server and the latter to register a 32bit server. Thanks and Regards, Gamer

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  • ASP.Net MVC 2.0: EditorFor setting name via attributes

    - by vdh_ant
    Hey guys Just wondering how do I mimic the following using attributes... <%= Html.EditorFor(x => x.SportProgramIdList, "FormMultiSelectDropDownList", "SportProgramIds")%> I know I can specify the template by using [UIHint("FormMultiSelectDropDownList")] but I am left with the problem with how to set the name... Cheers Anthony

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  • Modal Tab Bar ViewController

    - by Kevin Sylvestre
    I need to present a modal tab bar controller using interface builder. I'd like to be able to specify and design the tab bar controller in a InfoViewController.xib file, then present it from a variety of locations within the application using something like: UIViewController *vc = [InfoViewController create]; [self presentModalViewController:vc animated:YES];

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  • Optional parameters in Visual Studio 2008 Crystal Reports

    - by Andrew
    I am developing a Crystal Report in Visual Studio 2008. I am trying to implement optional parameters so that a user does not have to specify a value or range for a particular field. Essentially, this means there is no filtering done on that field if the user wishes. However, I can't seem to figure out how to do this. Does anyone have any ideas? Let me know if more information is required.

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  • Papervision 3D: How can I force dimensions on a collada file

    - by imadethisthing
    Hey everyone, I'm working with Collada files and I need them to be a certain size. When instantiating them in pv3d you set the filename, materials, and scale. Scale works like a percentage, and there's no way to get the width, height, or depth of the DAE once in flash. I want to be able to specify the size of DAE in 3D space relative to other pv3d native geometry.

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  • NHibernate complex one-to-one mapping

    - by Eugene Strizhok
    There is a table A containing common unversioned data for entities. There are also tables B,C,D with versioned data of particular entity type. All of these tables are referencing table A. The task is to add a mapping of a property of entity's type, for example, stored in table B, which would reference table A, and specify a rule how entity should be fetch from table B based on identifier from table A. (For example, to fetch latest version of an entity). It it possible with NHibernate?

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  • efficient algorithm for drawing circle arcs?

    - by banister
    I am using the mid-point circle algorithm (bresenham circle) to efficiently draw whole circles. Is there something similar to draw circle arcs? I would like to specify a start angle and end angle and have only that portion of the circle drawn. Thanks in advance! EDIT: I would like to draw filled circle arcs too, i.e pie-slices. :)

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  • Second choice font in HTML

    - by Amar Ravikumar
    This might be slightly basic. Sorry for that but I was wondering if it is possible that the second choice font we specify in HTML (using font/font-family) can be of a different font-size. Eg. Use Lucida Grande, size 13 or Arial, size 14 if that wasn't found

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  • What is the gstreamer caps syntax?

    - by joeforker
    What is the syntax for caps, specifying media capabilities, in gstreamer? Caps are strings that specify the type of media allowed and look like "audio/x-raw-int,..." but I haven't been able to find good documentation on exactly what is allowed in a caps string.

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  • Unique Constraint Nhibernate.

    - by Will
    I have a object with a Nhibernate mapping that has a surrogate ID and a natual ID. Since of cource the natural ID is uniquely constrained a insert query will fail if the object is already in the database with the same natural ID. My solution for this has been to manually check to see if natural IDs are in the database before trying to insert. Is there a way to specify Nhibernate to do a select before insert on natural Id's/Unique Constraints?

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  • Set PATH in NetBeans

    - by J. Pablo Fernández
    When running Ruby code on NetBeans (like when running the tests) I'm having some failures because a program is not being found. That program is installed somewhere in /opt and while for the shell I get that added to my PATH, it seems NetBeans is not getting it. How do I specify the PATH in NetBeans?

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  • Query MySQL with unicode char code.

    - by Ben
    Hi, I have been having trouble searching through a MySQL table, trying to find entries with the character (UTF-16 code 200E) in a particular column. This particular code doesn't have a glyph, so it doesn't seem to work when I try to paste it into my search term. Is there a way to specify characters as their respective code point instead for a query? Thanks, -Ben

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  • XHTML Column Padding Bug

    - by Axel Myers
    Try setting the padding of <td> to more than 1px, you can't. You can only specify 0 or 1px padding for this td. But why ? It's same in both transitional and strict document types. http://www.pro-turk.net/xhtml_col.html

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  • Fiddler - Daily stop start

    - by weismat
    What is the best way to stop/start Fiddler as a daily task? I am usin Fiddler to monitor/logs https trafficon machine which runs fully automated and runs software which is not controlled by me, but uses https. My machine stopped yesterday because Fiddler went out of memory after running over 3 days and now I want to have a clean way to start/stop it. I guess I could just specify a process duration in the task manager, but I would prefer something cleaner, especially to avoid issues when things are started manually.

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  • Populating Specific Cells Using VBA

    - by Daniel
    I am using VBA to pull from a SQL table and it automatically populates cell E14. Not sure why it's that cell, but is there a way to specify which cell it pulls the data into? Here's what I have right now: strSQL = "SELECT distinct Source FROM dbo.Simulations WHERE SimulationID = 5

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  • Using Gems with MacRuby

    - by Craig Williams
    How do you use gems from a MacRuby .5 application on Snow Leopard? Do I need to specify the gem path? If so, how do I do this? Best scenario is to package the gems inside the application so the user would not have to install them when the app is distributed.

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  • Sql Shorthand For Dates

    - by vigilant
    Is there a way to write a query equivalent to select * from log_table where dt >= 'nov-27-2009' and dt < 'nov-28-2009'; but where you could specify only 1 date and say you want the results for that entire day until the next one. I'm just making this up, but something of the form: select * from log_table where dt = 'nov-27-2009':+1;

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  • What is the web.debug.config and web.release.config file for?

    - by chobo
    Hi, I just upgraded to VS 2010 and MVC 2.0 and I noticed the web.config has two additional files attached to it? Are thee files used to specify debug and release specific settings, so you don't clutter up the main web.config? Does it even make sense to place a connection string in the root web.config file if I have have a local and remote one in the debug and release web.configs respectively. Thanks!

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