Recent questions tagged C

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c - Why is int x[n] wrong where n is a const value?

I cannot understand why doing this is wrong: const int n = 5; int x[n] = { 1,1,3,4,5 }; ... clarification of what's happening in the background. 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 - Who can give me the latest netlink programming samples?

I'm writing a Linux driver using netlink to communicate between user space and kernel space. But I can't ... netlink socket. Thanks in advance! 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 - Generating random number within Cuda kernel in a varying range

I am trying to generate random number random numbers within the cuda kernel. I wish to generate the random numbers from ... and 5 and so on... 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 this statement printed twice in while loop?

I wrote this simple program for practise: #include <stdio.h> #include <stdlib.h> #include <string.h> #define ... ... host-mb:c_practice host$ 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 at background when convert int to float

I have some no understanding about how one can cast int to float, step by step? Assume I have a signed integer ... . Moreover, for float to int 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 - strcat implementation

I tried to implement the strcat by myself, and I found the strcat implementation from Wiki like this......but when I ... ] = ''; return dest; } 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 can't I copy an array by using `=`?

I'm starting to learn C by reading K&R and going through some of the exercises. After some struggling, I was ... array copying index by index? 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 - extern declaration, T* v/s T[]

I saw following piece of code in a legacy project. /* token.c */ struct token id_tokens[MAX_TOKENS] ... guaranteed to be equivalent? 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 - Extract current route from netlink message, code attached

I'm trying to monitor route changes with netlink socket, but how should I get the updated route address ? Code: ... (sock); return 0; } 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 - fast elapsed time on linux

I am looking for a fast way to get the elapsed time between two calls of a function in C. I considered using ... , to use in a benchmark 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 - Reading from a promiscuous network device

I want to write a real-time analysis tool for wireless traffic. Does anyone know how to read from a promiscuous ( ... t seem to make sense 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 - /lib64/libc.so.6: version `GLIBC_2.14' not found

I am facing the following error regarding glibc. ./simulator: /lib64/libc.so.6: version `GLIBC_2.14' not found ( ... t it be 2.19 error ? 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 - Winsock UDP packets being dropped?

We have a client/server communication system over UDP setup in windows. The problem we are facing is that when ... provide more info. 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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527 views

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c - What is the purpose of the first "node" in the declaration: "typedef struct node { - - - } Node;"?

I am studying code examples from my professor in order to become better acquainted with linked data structures. In our ... "struct node *next"? 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 - Does Linux's splice(2) work when splicing from a TCP socket?

I've been writing a little program for fun that transfers files over TCP in C on Linux. The program reads a file ... .3 (running coLinux on XP.) 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 - strcat concat a char onto a string?

Using GDB, I find I get a segmentation fault when I attempt this operation: strcat(string,&currentChar); Given that ... a char onto 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 - String in function parameter

int main() { char *x = "HelloWorld"; char y[] = "HelloWorld"; x[0] = 'Z'; //y[0] = ' ... for function parameters?? Please share your knowledge. 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 - correct way to assign function pointer

I'm a little confused about the correct syntax for assigning a function pointer to a variable. If I have a ... or am I missing 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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706 views

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c - char x[256] vs. char* = malloc(256*sizeof(char));

Someone here recently pointed out to me in a piece of code of mine I am using char* name = malloc(256* ... level terms what the difference is? See Question&Answers more detail:os...

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

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367 views

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c - Standard sorting networks for small values of n

I'm looking for a sorting network implementation of a 5-element sort, but since I couldn't find a good ... above-mentioned criteria are met.) See Question&Answers more detail:os...

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

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481 views

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c - How to allow certain threads to have priority in locking a mutex use PTHREADS

Assume that the following code is being executed by 10 threads. pthread_mutex_lock(&lock) Some trivial code ... task? Regards lali 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 - replace a dynamic shared library in run time

I need to use different dynamic library over a execution cycle of a program. Looking at dlfcn.h I ... Using dynamic library Segmentation fault 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 - TCP Connect error 115 Operation in Progress What is the Cause?

My application creats a TCP connection, This is working normaly. But in one network server has many IP say 174.X.X. ... 1; } } return success; } See Question&Answers more detail:os...

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

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443 views

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c - How do I call Windows DLL functions from Ruby?

I want to access functions within a DLL using Ruby. I want to use the low-level access of C while still ... code. How do I accomplish this? 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 - (K&R) At least the first 31 characters of an internal name are significant?

When taken literally, it makes sense, but what exactly does it mean to be a significant character of a variable name ... mean by "single case"? See Question&Answers more detail:os...

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

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498 views

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c - What happens to fields not named by a designated initializer?

In C99 (and not in C++), it's possible to initialize structs using this syntax: struct info { char ... What happens to the unspecified fields? See Question&Answers more detail:os...

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

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541 views

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c - What is the difference between locking with `fcntl` and `flock`?

I'm reading for hours but can't understand what is the difference between the two locks. The only thing I ... want to use fcntl() locks? See Question&Answers more detail:os...

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

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520 views

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c - To use goto or not?

This question may sound cliched, but I am in a situation here. I am trying to implement a finite state automaton ... as I am on an internship. See Question&Answers more detail:os...

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

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