Recent questions tagged C

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c - Extracting precise frequencies from FFT Bins using phase change between frames

I have been looking through this fantastic article: http://blogs.zynaptiq.com/bernsee/pitch-shifting-using-the-ft/ ... scratch, step by step? 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 - Understanding CPU cache and cache line

I am trying to understand how CPU cache is operating. Lets say we have this configuration (as an example). ... I got something wrong. Thanks 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 - Reverse an array without using iteration

A question was asked to me today and I do not believe it is possible, but I could be wrong or am over ... without using some form of iteration. 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 - ASCII strings and endianness

An intern who works with me showed me an exam he had taken in computer science about endianness issues. There was a ... ask : who is right here? 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 stdint.h and inttypes.h

What is the difference between stdint.h and inttypes.h? If none of them is used, uint64_t is not recognized but ... them it is a defined type. 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 'global' and 'static global'

A global variable's scope is in all the files, while a static global variable's scope is just the file ... global variables stored in memory? 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 - The real difference between "int" and "unsigned int"

int: The 32-bit int data type can hold integer values in the range of ?2,147,483,648 to 2,147,483,647. You may ... , O.o. I'm a bit confused. 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 are asynchronous signal handlers executed on Linux?

I would like to know exactly how the execution of asynchronous signal handlers works on Linux. First, I am unclear ... used? How does it work? 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 - gcc debug symbols (-g flag) vs linker's -rdynamic option

glibc provides backtrace() and backtrace_symbols() to get the stack trace of a running program. But for this ... for backtrace_symbols to work ? 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 - pthread_join() and pthread_exit()

I have a question about C concurrency programming. In the pthread library, the prototype of pthread_join is int ... a difference in type? 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 can one see content of stack with GDB?

I am new to GDB, so I have some questions: How can I look at content of the stack? Example: to see ... an error. Platform: Linux and GDB 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 is a while loop needed around pthread wait conditions?

I'm learning pthread and wait conditions. As far as I can tell a typical waiting thread is like this: ... *one* thread pthread_mutex_unlock(&m); 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 I make Makefile to recompile only changed files?

I have been struggling a bit to get make to compile only the files that have been edited. However I didn't ... a_functions.o main.o -o program1 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 command-line tool to clean up code?

When I'm writing C - code I solely use an editor and gcc. I was wondering if anyone could suggest a good ... . Does anybody know a good tool? 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 doesn't this memory eater really eat memory?

I want to create a program that will simulate an out-of-memory (OOM) situation on a Unix server. I created ... ) with no swap and virtualized. 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 __DATE__ and __TIME__ predefined macros in as two integers, then stringify?

Want to use __ DATE __ and __ TIME __ as integer for giving automated version to my code in compile time. ... get-the-marco-name-not-its-value 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 detect if the current process is being run by GDB?

The standard way would be the following: if (ptrace(PTRACE_TRACEME, 0, NULL, 0) == -1) printf("traced! ") ... principle of the thing :)) Thanks 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 - pthreads mutex vs semaphore

What is the difference between semaphores and mutex provided by pthread library ? 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 - Writing programs to cope with I/O errors causing lost writes on Linux

TL;DR: If the Linux kernel loses a buffered I/O write, is there any way for the application to find out? I ... its writes had failed. Not fun. 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 purpose of fork()?

In many programs and man pages of Linux, I have seen code using fork(). Why do we need to use fork() and what is its purpose? 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 predefined macro can I use to detect clang?

I'm trying to detect the compiler used to compile my source code. I can easily find predefined macros to ... is currently compiling my code ? 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 does one represent the empty char?

I'm currently writing a little program but I keep getting this error when compiling error: empty character constant ... way to represent 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 - Aligning to cache line and knowing the cache line size

To prevent false sharing, I want to align each element of an array to a cache line. So first I need to know ... 63 is aligned to a cache line. 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 in the kernel during malloc?

I was asked this question during an interview. What they wanted to know was when the user calls malloc(4) ... help would be greatly appreciated. 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 - Where to put include statements, header or source?

Should I put the includes in the header file or the source file? If the header file contains the include statements ... in my source file only? 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 Difference Between read() and recv() , and Between send() and write()?

What is the difference between read() and recv(), and between send() and write() in socket programming ... , speed and other behaviors? 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 does this for loop exit on some platforms and not on others?

I have recently started to learn C and I am taking a class with C as the subject. I'm currently ... across different OSes and computers. 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 purpose of epoll's edge triggered option?

From epoll's man page: epoll is a variant of poll(2) that can be used either as an edge-triggered or a ... why it is necessary in the example. See Question&Answers more detail:os...

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

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