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How can I free an array of pointers where each pointer points to an address of a string which I allocated inside of a function?

I created a simple array of pointers, *pointers[], inside my main and I'm passing it to readline which returns the amount of lines I have read.

The purpose of this is to store all the lines of the input separated by '\n'. Each line is stored in a pointer in the array of pointers.

So after readline is called and it returns, I can printf("%s", pointers[0]) which will show the first line the user typed in.

The way I assign a line to each pointer in my array is inside readline by allocating a char pointer, *p, to have MAXLENGTH sizes and passing the current address of p to the respective pointer. After each assignment is done, I jump to the next free address of p.

Finally, my question is if I have to free (and how) my array of pointers after the readline routine is complete and I have printed all the lines stored.

I'll leave the two functions, main and readline, here for you.

Assuming I have this program below

The size of the array is 3 and basically when deleting it and then try to print the size again , I still get the value 3 . Why is that ?

I create a wireframe mesh of two lines between three points:

By these functions:

I have below data

against below query

In c++ I have the next code

In the following example, I'm trying to use shmget to allocate memory for one integer, and 10 foo structs and trying to access them linearly. However, it errors out with an "Address Boundary error".

For a MacOS system (but should be the same on Linux), I tried to allocate the exact amount of memory the two data structures should have taken and tried to byte address them linearly.

Needing several variations of a simple modal dialog with an MFC project, I wrote a simple class, CDialogDlg, which extends the standard MFC CDialog class and contains hooks for implementation specific callbacks that are normally implemented as methods in the class extending CDialog. These callbacks, if provided, are used when processing some events such as dialog initialization, OK button processing, and the DoDataExchange() function which provides the method for interfacing the dialog class variables and the actual dialog controls.

My first version of this class used standard functions for the callbacks. So the callback setting methods of the extended class set a function pointer with the address of the standard function.

I am trying to do explicit specialization for a template function called from another template function. Following is a minimum non-working example and I am trying to implement the following idea:

CInt, CDouble and CStr are equivalent of operations that I need to perform. But, CStr constructor expects a little different format. MyClass is equivalent of a factory, which when requested will return one of the instances of CInt, CDouble or CStr.

The motivation for this structure: Assume that GetCClass function is called from a function with ~100 lines and only one difference: the type of class. The values returned from GetCClass have same APIs.

EDIT 1: Platform is x86_64 for the sample program.

EDIT 2: I am editing this for better understanding. Below are two different questions. First question is can invalid read/write cause SIGBUS? and second question is Will Valgrind be useful for SIGBUS Analysis?. Sample code is for the second question to support my opinion that is Valgrind will not be useful at all in case of SIGBUS error. I might be wrong here.

Actual Scenario: We have a screen reader app which is crashing after 2 days of continuous testing (once crash due to SIGBUS). I have a coredump file but i don't have the right binary and debug packages. So essentially i have to test this in a different binary and coredump is not working properly in gdb due to mismatch in debug packages. I can see some invalid read/write in screen-reader module during Valgrind analysis. My teammate suggested that by fixing these invalid read/write will resolve this problem but i think it will not fix it. Below is my understanding of both the signals.

SIGSEGV: Address is valid but read/write permissions are not there.

SIGBUS: Address itself is invalid(CPU not able to find address due to mis aligment etc.)

I have a question related to SIGBUS signal. I have searched similar questions on stack overflow but didn't find any clear answer to this question.

Can Invalid read/write cause bus error(SIGBUS)?.

My understanding is that Invalid Read/Write will always cause Segmentation Fault (SIGSEGV) and best way to fix bus error is by running gdb on application. Valgrind analysis in case of bus error will not be helpful at all. Below code explains that in more detail.