Recent questions tagged C

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c - What is the __STDC_VERSION__ value for C11?

I know that compilers use __STDC__ to indicate that a compiler is standard C and, from, there, you can use ... know what the actual value is? 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 legal to use memset(…, 0, …) on an array of doubles?

Is it legal to zero the memory of an array of doubles (using memset( ,?0,? )) or struct containing doubles? ... of what the standard is saying.) 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 - comparing int with size_t

If i have a int and a size_t variable,can i compare them like: int i=1; size_t y=2; if(i==y) // do ... or i have to type-cast one of them? 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 shorten a 64-bit hash value down to a 48-bit value?

I already have a 64 bit hash function in a library (C coding), but I only need 48 bits. I need to ... ://stackoverflow.com/a/47895889/4731718. 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 - Array of variable length in struct

I've created 2 structures to represent images (a pixel and an image one) in C. typedef struct pixel { unsigned ... error and how I can solve it 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 - Terminating a thread gracefully not using TerminateThread()

My application creates a thread and that runs in the background all the time. I can only terminate the thread ... Please, code is needed here. 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 - Uninterruptable process in Windows(or Linux)?

Is there any way to make a program that cannot be interrupted (an uninterrupted program)? By that, I mean a ... t find any thing on Google. 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 - memory barrier and cache flush

Is there any archs where a memory barrier is implemented even with a cache flush? I read that memory ... means a cache flush/invalidation. 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 - mmap fails when length is larger than 4GB

(The correct code is in 'Update 5') I tried to map a range of memory from 0x100000000 to 0x200000000 in this ... and all these give kind help! 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 print the current thread stack trace inside the Linux kernel?

I would like to be able to print the stack trace of a thread in the Linux kernel. In details: I want ... fruitless (stepping makes no sense). 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 - Send string in PUT request with libcurl

My code looks like this: curl = curl_easy_init(); if (curl) { headers = curl_slist_append(headers, client_id_header); ... 127.0.0.1/test.php 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 - Why am I getting the last octet repeated when my Perl program outputs a UTF-8 encoded string in cmd.exe?

Update As @ikegami suggested, I reported this as a bug. Bug #121783 for perl5: Windows: UTF-8 encoded output ... qq{xcexb1xcexb2xcexb3}" αβγ?γ? 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 - Include struct in the %union def with Bison/Yacc

I am trying to include a struct as part of the union with Bison, but I get an error on the 'struct node ... Anyone know what I am doing 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 convert a char[] string to int in the Linux kernel?

How convert char[] to int in linux kernel with validation that the text entered is actually an int? ... ); return procfs_buffer_size; } 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 resolve fatal error LNK1000: Internal error during IncrBuildImage?

I am trying to recompile solution file for memcached project on Windows 7 64 bit with Visual Studio 2008 and got ... = 00000000 Dr7 = 00000000 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 - warning: assignment discards qualifiers from pointer target type

I wrote the following code: void buildArrays(char *pLastLetter[],int length[], int size, const char str[]) { int ... it and how to fix it? 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 - Using nl80211.h to scan access points

I'm trying to use nl80211.h for scanning access points for a simple WLAN manager. I can't find any example code ... }. How can I use them? See Question&Answers more detail:os...

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

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343 views

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c - in-place bit-reversed shuffle on an array

For a FFT function I need to permutate or shuffle the elements within an array in a bit-reversed way. That's a ... C, but any language is fine. 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 decrypt simple XOR encryption

I found the following XOR encryption function on the internet: void xor_encrypt(char *key, char *string) { int ... , all 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 - Malloc function (dynamic memory allocation) resulting in an error when it is used globally

#include<stdio.h> #include<string.h> char *y; y=(char *)malloc(40); // gives an error here int main() { strcpy ... ); strcpy(y,"hello world"); } See Question&Answers more detail:os...

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

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477 views

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c - Finding an interface name from an IP address

I need to get the interface name by providing an IP address. There is no system call to get this. I need ... IP address from an interface name. 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 Undefined Behaviour to cast away the constness of a function parameter?

Imagine I have this C function (and the corresponding prototype in a header file) void clearstring(const char * ... "pmg"; clearstring(name); 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 debug the entry-point of fork-exec process in GDB?

I have a C linux application (A) that spawns another process (P) when it is started. When I want to debug P I ... altering the code of A or P) 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's the best way to serialize data in a language-independent binary format?

I'm looking into a mechanism for serialize data to be passed over a socket or shared-memory in a language- ... not look for some standard? 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 - When to use strncpy or memmove?

(gcc 4.4.4 c89) I have always used strncpy to copy strings. I have never really used memmove or memcpy ... , server->h_length); Many 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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c - Performance benefits of strict aliasing

In C, what exactly are the performance benefits that come with observing strict aliasing? 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 - uint32_t vs int as a convention for everyday programming

When should one use the datatypes from stdint.h? Is it right to always use as a convention them? What was the ... size types like int and short? See Question&Answers more detail:os...

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

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394 views

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c - Code for malloc and free

Where can I find the code for malloc my gcc compiler is using at the moment? I actually want to write my own ... I want to see the real code. See Question&Answers more detail:os...

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

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