Recent questions tagged C

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c - Why do we need to compile for different platforms (e.g. Windows/Linux)?

I've learned the basics about CPUs/ASM/C and don't understand why we need to compile C code differently ... -Extension to my Linux executable? 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 - I Wanna know the Internal Members of struct FILE, the latest ones

When I read pg.176 of The C programming Language by K&R, I was very excited. I found all the members of struct FILE ( ... , fp->fd); 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 - Code Blocks redirecting input output

I'm new to code blocks, and I can't seem to get it to work with command line arguments of < input > ... am I missing here? 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 - Fastest way to convert binary to decimal?

I've got four unsigned 32-bit integers representing an unsigned 128-bit integer, in little endian order: typedef struct { ... { break; } } } } 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 - AES Encryption -Key Generation with OpenSSL

As a reference and as continuation to the post: how to use OpenSSL to decrypt Java AES-encrypted data? I ... /examples/links on this? 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 - How to use sendmsg() to send a file-descriptor via sockets between 2 processes?

After @cnicutar answers me on this question, I tried to send a file-descriptor from the parent process to ... msg_name and msg_namelen instead. 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 - Access of static variable from one file to another file

I recently came across the question like how to access a variable which declared static in file1.c to another ... to access static variable? 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 protect a global variable shared by isr and regular function?

Let's say I have function 1 and an isr routine, both share and update the same flag without any lock between ... can solve problems of syncs ? 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 - Unit testing for failed malloc()

What is the best way for unit testing code paths involving a failed malloc()? In most instances, it probably ... actually go about doing 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 - Resizing glitch with Ncurses?

I'm writing an ncurses program and am trying to make it respond correctly to terminal resizing. While I can ... a cleaner solution. 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 - Do I need static libraries to statically link?

On 'C', Linux, Do I need static libraries to statically link, or the shared ones I have suffice? If not, why ... 't they contain the same data?) 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 determine which command line options gcc passes to ld by default?

Consider the hello world C program: hello.c: #include "stdio.h" int main() { printf("Hello, World! "); } If ... through to ld in command [1] ? 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 - A way to find the size and location of padding in a struct?

I'm trying to write a tool that will take as input some C code containing structs. It will compile the code, ... to finding padding in a struct. 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 - Padding in union is present or not

Hello all, I want to know whether union uses padding? since the size of union is the largest data member size, can there be padding at the end? 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 - Bootloader for Cortex M3

I am using a LPC 1768 board from mbed, (with cortex M3 cpu) and I am trying to achieve something here, mainly ... . Thanks a lot for any help. 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 to pointer from integer of different size, pthread code

I have this code for matrix multiplication, using pthreads, but I get the error "cast to pointer from integer of ... prod, (void *)i); 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 curses on linux giving me following error?

Trying to get getch() working to capture key press. #include <curses.h> ... ... WINDOW *w; char f; ... `wgetch' undefined reference to `stdscr' 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 - Using the make command without makefiles?

I was compiling some C code for an assignment and I ran "make codeFile", where "codeFile" was the ... .org/TimothyDaly_files/class5/node5.html 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 use fftw_plan_many_dft on a transposed array of data?

I have a 2D array of data stored in column-major (Fortran-style) format, and I'd like to take the FFT of each row ... ); // do stuff 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 - Making assembly function inline in x64 Visual Studio

I know that MSVC compiler in x64 mode does not support inline assembly snippets of code, and in order to use assembly ... way to do what I want? 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 - Random float number

I wrote this function to get a pseudo random float between 0 .. 1 inclusive: float randomFloat() { float r = ( ... system("PAUSE"); 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 - File transfer server/client using socket

I am trying to make a file transfer between server and client, but is working very badly. Basically what needs to happen is: ... > 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 - indexing into an array with SSE

Suppose I have an array: uint8_t arr[256]; and an element __m128i x containing 16 bytes, x_1, x_2, ... ... Thanks in advance for your help. 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 integral overflow with scanf

When recently answering another question, I discovered a problem with code like: int n; scanf ("%d", &n); ... success in scanning the item. 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 - Socket recv() hang on large message with MSG_WAITALL

I have an application that reads large files from a server and hangs frequently on a particular machine. It has ... ways to debug the issue. 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 - Conforming variant of the old "struct hack" (?)

I believe I've found a way to achieve something like the well-known "struct hack" in portable C89. I'm curious if ... UB), or is it UB too? 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 properly seed a mersenne twister RNG?

This is actually not as simple as I first thought. In the absence of a hardware RNG, what is the best way to ... is used to generate UUID's? 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 - Can a C macro contain temporary variables?

I have a function that I need to macro'ize. The function contains temp variables and I can't remember if there ... this case - not much choice. See Question&Answers more detail:os...

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

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