So I'm trying to create a signal handler using pthreads which works on both OS X and Linux. The code below works on OS X but doesn't work on Fedora 13. The application is fairly simple. It spawns a pthread, registers SIGHUP and waits for a signal. After spawning the signal handler I block SIGHUP in the main thread so the signal should o...
Can someone explain this behaviour? test.c: #include <stdio.h> int main(void) { printf("%d, %d\n", (int) (300.6000/0.05000), (int) (300.65000/0.05000)); printf("%f, %f\n", (300.6000/0.05000), (300.65000/0.05000)); return 0; } $ gcc test.c $ ./a.out 6012, 6012 6012.000000, 6013.000000 I checked the assembly code and it...
Hi, I am searching a character at first occurence in string using the following code. But it is taking some time when the character is too long or the character that I am searching is at far extent, which delays other operations. How could I tackle this problem. The code is below here. Note: attrPtr is a char * which holds a referenc...
#include <stdio.h> void main() { int p[]={0,1,2,3,4}; int *a[]={p,p+1,p+2,p+3,p+4}; printf("%u %u %u",a,*a,*(*a)); } What *(*a) will print(will it print 0 or it's address)? And if we make array p as static(static int p[]), output gets changed .Why? ...
I've heard that objective-C is a proper superset of C, but is objective-C 2.0? The reason I ask is that either it isn't, or I misunderstand the phrase 'proper superset', because this code is valid C syntax: #import <stdio.h> int main () { char *nil = "hello"; printf("%s\n",nil); } But does not compile in Objective-C 2.0. Obv...
In C++, we have the abstraction and data hiding. Can we achieve this through C? ...
The following code manipulates pointers to point at the same location; I'm puzzled about why when I ran the code, the output didn't show value coinciding. #include "stdio.h" main() { int i=3,*x; float j=1.5,*y; char k='c',*z; x=&i; y=&j; z=&k; printf("\nAddress of x= %u",x); printf("\nAddress of y= %u",y); printf...
I have a function that is doing memcpy, but it's taking up an enormous amount of cycles. Is there a faster alternative/approach than using memcpy to move a piece of memory? ...
What are the differences (in performance, usability and functionality) in using #pragma once and #if !defined MYHEADER_INCLUDED_ constructs? Or what is the difference between the two? ...
i know it sounds crazy but, i just want to ask if is a compiler support multi programming language? like Delphi could also support C/C++/C# etc? if there is, please let me know. or how? ...
Possible Duplicate: How to generate a random number from within a range - C I'm looking for something I can use in C that will give me a random number between a and b. So something like rand(50) would give me a number between 1 and 50. ...
I've recently updated to a testing distribution, which is now using GCC 4.4.3. Now I've set everything up, I've returned to coding and have built my project and I get one of these horrible messages: *** glibc detected *** ./boxyseq: free(): invalid pointer: 0x0000000001d873e8 *** I absolutely know what is wrong here, but was rather con...
hi all, I found this structure called OBJECT_ATTRIBUTE in one of the nt dll functions..I was curious to know about that structure and I went through its documentation(msdn)...In the OBJECT_ATTRIBUTE structure there is a parameter called PUNICODE_STRING objectName...As per the msdn documentation..it says that the objectName "the name...
I'm using the standard gcc compiler in math software development with C-language. I don't know that much about compilers or compiler options, and I was just wondering, is it possible to make faster executables using another compiler or choosing better options? The default Makefile sets options -ffast-math and -O3 and I think both of them...
Hello all , What are the techniques used to write an embedded C software which has multi features. Features can be configurable for multi-hardware platform. I have developed a firmware based on a RTOS for ARM7. Now i want to make it a baseline firmware which can be used with similar, more or less features (configurable) on different mi...
Why infinite recursion leads to seg fault ? Why stack overflow leads to seg fault. I am looking for detailed explanation. int f() { ...
Hello! Is there any good plain C (or at least C++) library for parsing URL's that also supports IDN, so that it can easily parse url like http://президент.рф/ ...
I tried to use the function called NTCreateFile. When I compiled it gave me an error saying "_NTCreateFile identifier not found". I inlcuded the header winternl.h. So next I tried to use ZwCreatFile, as per MSDN I included ntifs.h, but I am not able to include that header. It says "not able to open/find the directory". I am using V@2008...
Say I had a library called libfoo which contained a class, a few static variables, possibly something with 'C' linkage, and a few other functions. Now I have a main program which looks like this: int main() { return 5+5; } When I compile and link this, I link against libfoo. Will this have any effect? Will my executable increase ...
I am using gsoap's wsseapi plugin and would like to store hashed sha1 passwords rather than plain text. I have spent a rediculous amount of time experimenting with various methods of hashing the plain text password for storage. Can anyone suggest a way to hash a password so it can be later verified against a username token digest sent b...