Recent questions tagged C

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c - How does the compiler allocate memory without knowing the size at compile time?

I wrote a C program that accepts integer input from the user, that is used as the size of an integer array, ... using malloc() and calloc()? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Dynamically allocating array explain

This is sample code my teacher showed us about "How to dynamically allocate an array in C?". But I don't ... also really confusing me..... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Producer Consumer program using semaphores and pthreads

I have written a code for producer-consumer problem.But I am not getting the output.There is no compilation error, ... ; } pthread_exit(NULL); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Android NDK: custom WebView compiling from source

My goal is to create a modified version of WebView (call it WebViewCustom) in Android for my personal use in my ... the main steps of this task? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Linux Threads suspend/resume

I'm writing a code in which I have two threads running in parallel. 1st is the main thread which started ... where it was paused / suspended. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What happens when a thread forks?

I know calling fork() sys_call from a thread is a bad idea. However, what will happen if a thread creates a new ... { // Do something; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Linux Socket: How to detect disconnected network in a client program?

I am debugging a c based linux socket program. As all the examples available in websites, I applied the ... can not change server side? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c preprocessor - Making something both a C identifier and a string?

Say you want to generate a matched list of identifiers and strings enum { NAME_ONE, NAME_TWO, NAME_THREE }; ... put parameters within a string? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How do unix signals work?

How do signals work in unix? I went through W.R. Stevens but was unable to understand. Please help me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - return to lib_c buffer overflow exercise issue

I'm supposed to come up with a program that exploits the "return to libc buffer overflow". This is, when executed ... : export MYSHELL="/bin/sh" See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Cast int to pointer - why cast to long first? (as in p = (void*) 42; )

In the GLib documentation, there is a chapter on type conversion macros. In the discussion on converting an int to a ... the cast to a pointer? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Difference between -> and . in a struct?

If I have a struct like struct account { int account_number; }; Then what's the difference between doing myAccount. ... ? -> seems so messy. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Can't get rid of "this decimal constant is unsigned only in ISO C90" warning

I'm using the FNV hash as a hashing algorithm on my Hash Table implementation but I'm getting the warning in the ... options to get rid of it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Linking a shared library against a static library: must the static library be compiled differently than if an application were linking it?

At least on Linux and Solaris, static libraries are really just a bunch of compiled .o's tossed into one big ... though, does anyone know?). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What is the best way to return an error from a function when I'm already returning a value?

I wrote a function in C that converts a string to an integer and returns the integer. When I call the function I ... = -num; } return num; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How universally is C99 supported?

How universally is the C99 standard supported in today's compilers? I understand that not even GCC fully ... compilers will understand me? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - how to find gcc version on mac

I am using OS 10.9 on mac machine. I want to know the version of gcc I am using. So I tried gcc -- ... gcc command executes clang or gcc(gnu). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - 'readline/readline.h' file not found

I have included: #include "stdio.h" #include <readline/readline.h> #include <readline/history.h> and my compiler ... .die.net/man/3/readline See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - ALSA tutorial required

I am New to audio programming.I want to create small application which is capable of playing and gives volume ... well as alsa programming . See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Combining static libraries

Suppose I have three C static libraries say libColor.a which depends on *libRGB.*a which in turn depends ... update static libraries/archives). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - method vs function vs procedure vs class?

I know the basics of this methods,procedures,function and classes but i always confuse to differentiate among those ... with simple examples ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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426 views

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c - Cuda Shared Memory array variable

I am trying to declare a variable for matrix multiplication as follows: __shared__ float As[BLOCK_SIZE][BLOCK_SIZE]; I am ... + tx] = Csub; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why cgo's performance is so slow? is there something wrong with my testing code?

I'm doing a test: compare excecution times of cgo and pure Go functions run 100 million times each. The cgo function ... OS X 10.9.4 (13E28) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Pointer-array-extern question

File 1.c int a[10]; File main.c: extern int *a; int main() { printf("%d ", a[0]); return 0; } Gives me a segfault! What's going wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to use printf() in multiple threads

I am implementing a multithreaded program that uses different cores, and many threads are executed simultaneously. Each ... ) call in another? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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c - How to utilize a thread pool with pthreads?

I have a queue of jobs and I want to make a pool of four threads where I can throw my jobs at. What I ... new work to do, without killing them? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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432 views

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c - Understanding loff_t *offp for file_operations

I'm designing a device driver that simply reads and writes to a character buffer. My question is however ... that I seem ambiguous about. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to encode PNG to buffer using libpng?

I'm currently using the following to write a PNG to a file: #include <png.h> #include <stdio.h> ... the first to need this functionality. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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