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Showing content from https://cplusplus.com/reference/cstdlib/_Exit/ below:

function

<cstdlib>

_Exit 
[[noreturn]] void _Exit (int status) noexcept;

Terminate calling process

Terminates the process normally by returning control to the host environment, but without performing any of the regular cleanup tasks for terminating processes (as function exit does).

No object destructors, nor functions registered by atexit or at_quick_exit are called.

Whether C streams are closed and/or flushed, and files open with tmpfile are removed depends on the particular system or library implementation.

If status is zero or EXIT_SUCCESS, a successful termination status is returned to the host environment.


If status is EXIT_FAILURE, an unsuccessful termination status is returned to the host environment.
Otherwise, the status returned depends on the system and library implementation.

Parameters
status
Status code.
If this is 0 or EXIT_SUCCESS, it indicates success.
If it is EXIT_FAILURE, it indicates failure.

Return Value none (the function never returns).

Example 
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/* _Exit example */
#include <stdio.h>      /* printf, fopen */
#include <stdlib.h>     /* _Exit, EXIT_FAILURE */

int main ()
{
  FILE * pFile;
  pFile = fopen ("myfile.txt","r");
  if (pFile==NULL)
  {
    printf ("Error opening file");
    _Exit (EXIT_FAILURE);
  }
  else
  {
    /* file operations here */
  }
  return 0;
}

Data races Concurrently calling this function multiple times has no effect.

Exceptions (C++)No-throw guarantee: this function never throws exceptions.

See also
exit
Terminate calling process (function)
quick_exit
Terminate calling process quick (function)
abort
Abort current process (function)

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