Recent questions tagged C

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c - Why does malloc allocate a different number of bytes than requested?

I have this piece of code #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <string.h> int ... bigger than 1024. Am I wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How are multiple prior declarations resolved for a new declaration with extern?

What should the third x refer to in: #include <stdio.h> static char x = '1'; int main(void) { char x ... which of these should be the case? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - _beginthread vs CreateThread

What is the difference between CreateThread and beginthread APIs in Windows? Which one is preferrable for thread creation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - UNIX Pipes Between Child Processes

I'm trying to write a program that will spawn an arbitrary number of child processes and pipe between them, ... so it can continue executing. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Convert integer to string without access to libraries

I recently read a sample job interview question: Write a function to convert an integer to a string. Assume you do ... would you go about this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Mouse movement events in NCurses

I wonder if there is such a thing as mouse movement events in NCurses, and if there is a way to catch ... evenet? Many thanks in advance! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Loading two instances of a shared library

For a test I'd like to load two instances of a shared library from an application. The code in the ... this portable for windows and linux? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What is long double on x86-64?

Someone told me that: Under x86-64, FP arithmetic is done with SSE, and therefore long double is 64 bits. But ... 16 80-bit extended (IEEE-754) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Do C99 signed integer types defined in stdint.h exhibit well-defined behaviour in case of an overflow?

All operations on "standard" signed integer types in C (short, int, long, etc) exhibit undefined behaviour if they yield ... + 1); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - StackWalk64 on Windows - Get symbol name

Alright, second question on SO in one day. Looks like Windows programming makes me happy... : S I'm ... , without third party libraries... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - malloc zeroing out memory?

Given this C code compiled with gcc 4.3.3 #include <stdio.h> #include <stdlib.h> int main(int argc, char * ... memory it returns? If so, why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Freeing allocated memory: realloc() vs. free()

so I have a piece of memory allocated with malloc() and changed later with realloc(). At some point in my ... and then do another malloc()? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to get fullstacktrace using _Unwind_Backtrace on SIGSEGV

I handle SIGSEGV by code: int C() { int *i = NULL; *i = 10; // Crash there } int B ... which cause SIGSEGV signal using _Unwind_Backtrace? thnx See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Does a string literal count as a partial initializer and zero-initialize?

In C, you can partially initialize a struct or array, with the result that the members/elements that aren't ... 's what the spec requires. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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643 views

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c - Is there any way to get 64-bit time_t in 32-bit programs in Linux?

On Windows I can call: _time32(__time32_t); // to get 32-bit time_t _time64(__time64_t); // to get 64-bit ... in Linux (compiling with GCC)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How do I fill a va_list

If I have a va_list I know how to extract all its elements: void printInts(int n,...) { va_list va; ... that va_list of all its parameters. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is it OK to access past the size of a structure via member address, with enough space allocated?

Specifically, is the following code, the line below the marker, OK? struct S{ int a; }; #include <stdlib.h> int main(){ ... ), str); // ^^^^^^^ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is it always safe to convert an integer value to void* and back again in POSIX?

This question is almost a duplicate of some others I've found, but this specifically concerns POSIX, and a very ... portable thing to be doing. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - kvm: module verification failed: signature and/or required key missing - tainting kernel

I'm using Ubuntu 14.04 LTS and kernel version 3.13.11.4. I'm trying to load patched KVM modules kvm ... an warning. Any help is appreciated! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c preprocessor - Scope of macros in C?

How these macros are evaluated? # define i 20 void fun(); int main(){ printf("%d",i); fun(); printf ... output as 3030. Please Explain. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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627 views

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c - Eclipse CDT "Symbol NULL could not be resolved"

I just installed Eclipse CDT with MinGW. All the environment variables are set, includes, etc. Tried running ... resolved Any insights? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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308 views

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c - Does sin_addr.s_addr = INADDR_ANY; need htonl at all?

I came across two threads: Socket with recv-timeout: What is wrong with this code? Reading / Writing to a socket ... doesn't. Which is right? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How does the compiler know that the comma in a function call is not a comma operator?

Consider the function call (calling int sum(int, int)) printf("%d", sum(a,b)); How does the compiler decide ... that it is not a comma operator. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Making a Hash Pyramid

Currently doing the CS-50 course and was wondering if anyone could help me with this. I'm supposed to create ... would be much appreciated! :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Problem in Timers and signal

I have implemented a POSIX timer using timer_create( ) API, and this will generate SIGUSR1 when the timer expires ... generated by the timer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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302 views

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c - System call fork() and execv function

I'm trying to run two executables consecutively using this c code: #include <stdio.h> #include <unistd.h> int ... parent after the child exits? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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323 views

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c - How to use a defined struct from another source file?

I am using Linux as my programming platform and C language as my programming language. My problem is, I define ... this structure in a header? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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271 views

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c - Correct way of defining NULL and NULL_POINTER?

As far as I know, C defines NULL like this: #define NULL ( (void *) 0) Then, how should we define ... be the logical definition, if any ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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