Recent questions tagged C

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Is it safe to do something like the following? #include <stdio.h> #include <malloc.h> #include <string.h> int ... )malloc(sizeof(char) * 15); 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 make a linux shared object (library) runnable on its own?

Noticing that gcc -shared creates an executable file, I just got the weird idea to check what happens when I try to ... a library -- or can I? 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 - X11 Wait for and Get Clipboard Text

I have to monitor the X11 Clipboard. For the moment, I request the ClipBoard Selection each 5 seconds, ... clipboard modifications with X11 ? 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 - Reading from stdin

What are the possible ways for reading user input using read() system call in Unix. How can we read from stdin byte by byte using read()? 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 there a document describing how Clang handles excess floating-point precision?

It is nearly impossible(*) to provide strict IEEE 754 semantics at reasonable cost when the only floating-point ... %rax fstpl (%rax) 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 - assigning more than one character in char

Why this program gives output 'y' #include <stdio.h> int main(void) { char ch='abcdefghijklmnopqrstuvwxy'; printf(" ... 0; } Code at ideone 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 add a Linux kernel driver module as a Buildroot package?

I am currently building an Embedded Linux for my Zybo Board from Xilinx. For this I use Buildroot. Now I want ... the Config.in and Makefile? 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 - Opengl drawing a 2d overlay on a 3d scene problem

I have a moving 3d scene set up, and I want to make a stationary 2d GUI overlay that is always ... glEnable(GL_DEPTH_TEST); glutSwapBuffers(); 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 store a variable at a specific memory location?

As i am relatively new to C , i have to use for one of my projects the following: i must declare some ... Laurentiu Update: I am using a 32uC 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 - free a double pointer

I created a 2-D matrix using double pointer like that: int** pt; pt = (int*) malloc(sizeof(int)*10); I ... used or it will be same as initial? 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 - Compare two floats

#include <stdbool.h> bool Equality(double a, double b, double epsilon) { if (fabs(a-b) < epsilon) return ... to execute.. Thanks for your 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 - Which thread handles the signal?

I have 2 threads(thread1 and thread2). And I have signal disposition for SIGINT. Whenever SIGINT occurs thread ... execute my signal handler? 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 - x86_64 : is stack frame pointer almost useless?

Linux x86_64. gcc 5.x I was studying the output of two codes, with -fomit-frame-pointer and without (gcc at ... good only for user space ? 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 do compilers not warn about out-of-bounds static array indices?

A colleague of mine recently got bitten badly by writing out of bounds to a static array on the stack (he added ... a warning at the very least? 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 convert char * to BSTR?

How can I pass a char * from C dll to VB Here is sample code: void Cfunc(char *buffer,int len) { ... . Could anyone please suggest a solution? 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 solve "BUG: scheduling while atomic: swapper /0x00000103/0, CPU#0"? in TSC2007 Driver?

I found tsc2007 driver and modified according to our needs. Our firm is producing its own TI DM365 board. In this ... start to use work queue. 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 - Where are syscalls located in glibc source

So I was looking through the linux glibc source and I don't see where it actually does anything. The following ... chdir) #include <stub-tag.h> 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 - /usr/bin/ld: cannot find -lc while compiling with makefile

Context first: I have a header (event.h), a program called event.c, and the main program main.c ... compiling this without installing anything? 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 - Checking if errno != EINTR: what does it mean?

I've found this piece of code used several times (also a similar one where it's used open() instead of write()). ... (POSIX.1); see signal(7). 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 - Questions about putenv() and setenv()

I have been thinking a little about environment variables and have a few questions/observations. putenv(char *string); ... () over setenv()? 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 - MPI Get Processor with Minimum value

In MPI, I am doing a reduce operation(minimum) on a value. This works fine, but how do I grab the ... data with the reduce operation)? 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 - Count number of digits - which method is most efficient?

There are more than one solution for finding the-number-of-digits in a given number. For example: Method ... complexity of library functions? 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 - getc Vs getchar Vs Scanf for reading a character from stdin

Of the below three functions: getc getchar & scanf which is the best one for reading a character from stdin and ... one better than the other? 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 read numbers separated by space using scanf

I want to read numbers(integer type) separated by spaces using scanf() function. I have read the following ... different variables. Please 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 does a pipe work in Linux?

How does piping work? If I run a program via CLI and redirect output to a file will I be able to ... feed back would be greatly 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 - Extend a line segment a specific distance

I am trying to find a way to extend a line segment by a specific distance. For example if I have a line ... that helps me any in this case. 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 - Getting multiple values with scanf()

I am using scanf() to get a set of ints from the user. But I would like the user to supply all 4 ints at ... 345 456 Is it possible to do this? 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 - Expressions "j = ++(i | i); and j = ++(i & i); should be a lvalue error?

I was expecting that in my following code: #include<stdio.h> int main(){ int i = 10; int j = 10; j = ++(i ... c99 mode: gcc x.c -Wall -std=c99. See Question&Answers more detail:os...

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

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