Recent questions tagged c

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c - Bitwise operations equivalent of greater than operator

I am working on a function that will essentially see which of two ints is larger. The parameters that are passed ... ifs, whiles, fors etc... 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 something to replace the <ucontext.h> functions?

The user thread functions in <ucontext.h> are deprecated because they use a deprecated C feature ( ... at implementing cooperative threading. 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 take command line argument in Codeblock 10.05?

I am writing a C code in codeblock version 10.05. The program is: int main(int argc , char *argv[]) ... How can i supply command line arguments? 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 declare an inline function in C99 multi-file project?

I want to define an inline function in a project, compiled with c99. How can I do it? When I declare the ... uses both lib1.o and lib2.o 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 use _mm_malloc? (as opposed to _aligned_malloc, alligned_alloc, or posix_memalign)

There are a few options for acquiring an aligned block of memory but they're very similar and the ... advantage? Historical accident? 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 - Specifically, how does fork() handle dynamically allocated memory from malloc() in Linux?

I have a program with a parent and a child process. Before the fork(), the parent process called malloc() ... allocated memory on the heap. 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 - increment value of int being pointed to by pointer

I have an int pointer (i.e., int *count) that I want to increment the integer being pointed at by using the ... ++ operator as well. Any ideas? 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 - Taking string input in char pointer

#include<stdio.h> #include<string.h> #include<stdlib.h> int main(){ char *s; printf("enter the string : ") ... related to the input buffer of C? 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 ensure a dynamically allocated array is private in openmp

I'm working in C with openMP using gcc on a linux machine. In an openmp parallel for loop, I can ... the dynamically allocated array as private? 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 - Understanding the hardware of printf

I was wondering if there was any resources available online that explains what happens with something, like printf ... (BIOS/kernel calls) 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 - Partitioning struct into private and public sections?

In C++ and Java, data structures can have private, public and protected regions. I'd like to port this ... Oriented concepts into C. 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 - How to get the absolute path for a given relative path programmatically in Linux?

How to get the absolute path for a given relative path programmatically in Linux? Incase of Windows we have ... _fullpath of Windows in Linux? 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 type cast a void pointer?

Being new to C, the only practical usage I have gotten out of void pointers is for versatile functions that may ... pointer instead of a void? 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 - Difference in position-independent code: x86 vs x86-64

I was recently building a certain shared library (ELF) targeting x86-64 architecture, like this: g++ -o binary.so ... with -fPIC on the former? 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 should -m32 option of gcc be used?

I am writing a program which if I compile on a Suse 10 32-bit system without adding the -m32 option ... there any updates or changes required? 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 - UNIX Portable Atomic Operations

Is there a (POSIX-)portable way in C for atomic variable operations similar to a portable threading with pthread? ... X in a similar way. 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 much overhead can the -fPIC flag add?

Question I am testing a simple code which calculates Mandelbrot fractal. I have been checking its performance depending ... and slower with 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 - Size of pointers: Dependent factors

I am finding difficulties in understanding the factors on which the size of pointer variables in C is dependent ... available to the program. 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 do I synchronize access to shared memory in LynxOS/POSIX?

I am implementing two processes on a LynxOS SE (POSIX conformant) system that will communicate via shared ... appropriate in this scenario? 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 possible to find the Memory Allocated to the Pointer, without searching for the malloc statement

Suppose I have allocated memory to some pointer in a function foo: void foo() { // ... int *ptr = malloc( ... to the pointer, using GDB? 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 pointer to array of structs

I know this question has been asked a lot, but I'm still unclear how to access the structs. I want to make ... type? test_t *_array_ptr[2];? 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 GCC generate bswap instruction for big endian store without builtins?

Update: This was fixed in GCC 8.1. I'm working on a function that stores a 64-bit value into memory in ... : I found the corresponding GCC bug. 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: this decimal constant is unsigned only in ISO C90

Piece of code : long rangeVar = 0; rangeVar = atol(p_value); if (rangeVar >= -2147483648 && rangeVar <= ... only in ISO C90 Thanks in Advance 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 is x86 instruction cache synchronized?

I like examples, so I wrote a bit of self-modifying code in c... #include <stdio.h> #include <sys/mman.h> // ... I tend to get lost in 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 - Programmatically verify certificate chain using OpenSSL API

This is very similar to other questions but the ones I've looked at either don't have an answer or don ... doesn't touch the disk unnecessarily. 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 calloc(4, 6) the same as calloc(6, 4)?

I'm a beginner C programmer, and I assumed that this would be the case, but would like some affirmation if ... just take one argument instead? 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 does MSVS not optimize away +0?

This question demonstrates a very interesting phenomenon: denormalized floats slow down the code more than an order ... leave them unsigned. 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 to find "gmp.h"?

I am installing a library, and got this error message: xxxx@ubuntu$ make (cd num; make all) make[1]: ... which package it is exactly about? See Question&Answers more detail:os...

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

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