Recent questions tagged C

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c - "lvalue required as left operand of assignment " error

The following code produces a "lvalue required as left operand of assignment" if( c >= 'A' && c <= 'Z' ... and how would I write it correctly? 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 - strtok wont accept: char *str

strtok wont work correctly when using char *str as the first parameter (not the delimiters string). Does it have ... delims); } 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 - Strings without a '' char?

If by mistake,I define a char array with no as its last character, what happens then? I'm asking this because I ... doh+ or doh^ 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 - Memory Isolation in new Linux Kernels, or what?

This my module perfectly hijacks user's console: https://pastebin.com/99YJFnaq And it was Linux kernel 4. ... the code with bypassing. 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 - Waste in memory allocation for local variables

This my program: void test_function(int a, int b, int c, int d){ int flag; char buffer[10]; flag = 31337 ... use the VM provides with the book. 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 - Calling a function in gcc inline assembly

Say, I want to call a function with the following signature in inline assembly of gcc. How can I do that? int some_function( void * arg ); 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 - Detecting and skipping line comments with Flex

How can I detect one line comments like // in Flex and skip those lines? Also, for /* comments, will the following ... c != 0) putchar(c1); } 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 - CUDA Dynamic Parallelism MakeFile

This is my first program using Dynamic Parallelism and I am unable to compile the code. I need to be able ... here run: build ./BlackScholes 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 printf() when printing multiple strings (%s) leaves newline and how to solve this?

I made a program which accepts strings (first/last names) but instead of a typical output of Phil Snowken age 3 , i am ... [i].age); 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 - Showing characters in extended ASCII code (Ubuntu)

I need to print characters part of ASCII extended, namely something like: char p = 219; // a rectangle printf ... see the rectangle? Thank you See Question&Answers more detail:os...

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

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489 views

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c - Conditional "pragma omp"

I am trying different kinds of parallelization using OpenMP. As a result I have several lines of #pragma omp parallel ... parallel for for ... 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 do we need to cast what malloc returns?

int length = strlen(src); char *structSpace = malloc(sizeof(String) + length + 1); String *string = ( ... *I created a struct called 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 - Quick strlen question

I've come to bother you all with another probably really simple C question. Using the following code: int ... Was that just a coincidence? See Question&Answers more detail:os...

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

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523 views

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c - Linux, UDP datagrams, and kernel timestamps: Lots of examples and stackoversflow entries later, and still cannot get timestamps at all

I have been trying and failing to get Linux (kernel 4.1.4) to give me timestamps for when UDP datagrams ... timestamps to get something out. See Question&Answers more detail:os...

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

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560 views

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c - Can't link OpenSSL code

I am trying to build an openssl simple program. Here is the complete code: #include <stdio.h> #include <stdlib.h> ... can I get this 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 - format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[64]

I'm creating a program using C, and I have this line in my code : scanf("%s", &path); When I compile the ... error? And how can I solve 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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453 views

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c - pthreads - Join on group of threads, wait for one to exit

In the POSIX thread interface, pthread_join(thread) can be used to block until the specified thread exits. Is ... threads, not a processes See Question&Answers more detail:os...

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

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298 views

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c - How can I read a child process's output?

I have written a function that attempts to read a child process's command line output via a pipe. This should be a ... -1; } // end launch() See Question&Answers more detail:os...

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

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651 views

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c - Is support of Annex K in C11 required for a conforming implementation?

While answering a question that made use of some functions (sscanf_s and sprintf_s) that I thought were not ... define an optional extension? 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 - Confusion about raw vs. cooked terminal modes?

I currently have a chat client that communicates successfully with a server. I am supposed to modify the behavior ... from using raw mode? See Question&Answers more detail:os...

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

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374 views

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c - What is the rationale for one past the last element of an array object?

According to N1570 (C11 draft) 6.5.6/8 Additive operators: Moreover, if the expression P points to the last ... Is there any rationale for 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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371 views

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c - Can the Libsndfile library be used on the iPhone iOS?

Can the Libsndfile C library be used on the iPhone operating system? If so, do I need to just 'include' ... more complicated then that. 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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483 views

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c - Gtk+ and OpenGL bindings

Simple and short: What is the most advanced OpenGL binding for GTK+? I would prefer a widget which ... have shortcomings/ serious issues. See Question&Answers more detail:os...

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

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355 views

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c - reversing linked list

I am trying to reverse a linked list using recursion and wrote the following code for it. The list is start of ... list. What am I doing 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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508 views

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c - What does the n stand for in `sscanf(s, "%d %n", &i, &n)`?

The man page states that the signature of sscanf is sscanf(const char *restrict s, const char *restrict ... assumption above for n correct? 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 extract the pre-master secret using an OpenSSL-based client?

I have an application I'm making that uses OpenSSL 1.0.2 and I'd like to examine the traffic with ... pre-master secret file for Wireshark. See Question&Answers more detail:os...

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

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284 views

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c - Different declarations of qsort_r on Mac and Linux

Let's see function qsort_r in Linux (/usr/include/stdlib.h): typedef int (*__compar_d_fn_t)(const void *, ... somewhere to solve this problem? See Question&Answers more detail:os...

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

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383 views

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c - Possible to define a function-like macro with a variable body?

I've been looking at the GCC docs for defining macros and it looks like what I want isn't possible, but I figure ... yes, I know this is evil. See Question&Answers more detail:os...

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

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