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Showing content from https://cplusplus.com/reference/cstdio/tmpnam/ below:

function

tmpnam

char * tmpnam ( char * str );

Generate temporary filename

Returns a string containing a file name different from the name of any existing file, and thus suitable to safely create a temporary file without risking to overwrite an existing file.

If str is a null pointer, the resulting string is stored in an internal static array that can be accessed by the return value. The content of this string is preserved at least until a subsequent call to this same function, which may overwrite it.

If str is not a null pointer, it shall point to an array of at least L_tmpnam characters that will be filled with the proposed temporary file name.

The file name returned by this function can be used to create a regular file using fopen to be used as a temporary file. The file created this way, unlike those created with tmpfile is not automatically deleted when closed; A program shall call remove to delete this file once closed.

Parameters

str: Pointer to an array of characters where the proposed temporary name will be stored as a C string. The suggested size of this array is at least L_tmpnam characters.
Alternativelly, a null pointer can be specified to use an internal static array to store the proposed temporary name, whose pointer is returned by the function.

Return Value On success, a pointer to the C string containing the proposed name for a temporary file:

If str was a null pointer, this points to an internal buffer (whose content is preserved at least until the next call to this function).
If str was not a null pointer, str is returned.

If the function fails to create a suitable filename, it returns a null pointer.

Example

/* tmpnam example */
#include <stdio.h>

int main ()
{
  char buffer [L_tmpnam];
  char * pointer;

  tmpnam (buffer);
  printf ("Tempname #1: %s\n",buffer);

  pointer = tmpnam (NULL);
  printf ("Tempname #2: %s\n",pointer);

  return 0;  
}

This program will generate two different names for temporary files. Each one has been created by one of the two methods in which tmpnam can be used.

Possible output:

Tempname #1: /s4s4.
Tempname #2: /s4s4.1