All Questions
7,699
questions
1
vote
1
answer
28
views
Can't put values together into struct that is initiated by pointer and malloc [duplicate]
Just a simple struct called person, inside I need to store name and age. I'm trying to dynamically allocate memory for my struct.
Without using pointer:
#include <stdio.h>
#include <stdlib.h&...
-6
votes
2
answers
71
views
malloc(): corrupted top size on deleting an entry from binary file [closed]
I AM CREATING A SCHOOL MANAGEMENT SYSTEM . WHEN I TRY TO DELETE A STUDENT AFTER ADDING ONE I AM GETTING "malloc(): corrupted top size" ERROR .CANT FIND THE REASON.I AM A BEGINNER , HELP ...
- 3
0
votes
1
answer
53
views
How to get rid of C6387 warning on call to fwrite function?
In Visual Studio 2022, I am getting the following warning when I call fwrite.
Warning image C6387
It says: C6387:'fout' could be '0': this does not adhere to the specification for the function 'fwrite'...
- 3
0
votes
0
answers
17
views
Initializing an array created with malloc with arbitrary values
I need to create large float arrays using malloc, to be able to free the memory when I don't need the array anymore.
The values are arbitrary, meaning they are not all zeros or ones, much more random ...
0
votes
0
answers
69
views
How do I solve "realloc(): invalid next size" error?
Here is the section of code where my program crashes:
if (fromNode != toNode) {
pthread_mutex_lock(&mtxs[fromNode]);
g->out[fromNode]++;
if (g->in[toNode].index == g->in[...
- 11
0
votes
3
answers
87
views
Error in assigning values to memory location with for loop [duplicate]
I have just entered the world of C programming, and I'm currently learning how to use malloc & free.
I've written a short excercise code to printf the string entered with scanf, and I am having ...
- 27
4
votes
2
answers
125
views
Function to clear allocated memory is not working
I'm trying to make a DTC in C. This is the structure of the nodes:
typedef struct node {
int value;
struct node *lower;
struct node *higher;
} node;
To free the memory allocated using ...
3
votes
2
answers
148
views
Malloc sometimes fails immediately after a free
I want to test my code in low memory situations.
I wrote this function with setrlimit to limit the available memory :
unsigned short int oom_enable = 0;
char* _oomfill = NULL;
uint32_t oom_setup(...
0
votes
1
answer
35
views
How to know heap overflow point?
I'm attempting to write a program that determines all palindrome within a given range. My program calls a function (number of digits) that returns the size of an integer (ie. 400 would be 3 as it has ...
- 67
1
vote
1
answer
78
views
wrong values when displayed : C pointer or malloc issue?
My program multiplies a matrix 1 by a matrix 2. The matrix 3 is the result.
I can display matrix 1 and matrix 2 with the correct values but I am not able to display though the same function the ...
- 199
0
votes
3
answers
116
views
Using the malloc function once initializes all uninitialized variables with a 0
The malloc function is not supposed to initialize any value to any variable it is used on, like the calloc function does. Why then do I keep getting the initialized value of even other varibales to ...
0
votes
0
answers
87
views
How to catch and fix a memory leakage?
I wrote a shell-like program and I have a memory leakage that I'm unable to fix.
in case of invalid_command && command1 || command2 (and it happens only in this case, everything else working ...
- 1
0
votes
1
answer
53
views
Nothing prints when i type input into the serial monitor
I am new to Arduino. I am trying to learn how to use receive data over USB, but it is not working.
This is my code:
struct arrayData{
char* array;
int size;
};
void setup() {
// put your ...
- 11
2
votes
1
answer
66
views
Unable to debug python C extension using valgrind
I am trying to debug a C extension I made using CFFI. I am using Python 3.11 and Valgrind 3.18.1.
As far as I can tell from the docs the only setup needed is setting the PYTHONMALLOC=malloc ...
- 357
1
vote
2
answers
103
views
Troubleshooting malloc Usage and heap_size Configuration in STM32 Development
I'm currently working with ST's ARM-M4 chip to develop a program and have ported a networking library. During debugging, I've noticed that if I don't increase the heap_size in my .s file to 0x400, the ...
- 59