tmpfile

Interface

#include <stdio.h>
FILE 
tmpfile (void)
char 
tmpnam (char *str)
char 
tempnam (const char *tmpdir, const char *prefix)

Description

Example 1

#include <stdio.h>
 
int main()
{
  // create a temporary binary file
  // using the "wb+" access parameters
  FILE *f = tmpfile();
 
  // ...use the temporary file...
 
  // close and delete the temporary file
  fclose(f);
  return 0;
}

The tmpnam function returns a pointer to a file name, in the <span class="Dv">P_tmpdir</span> directory, which did not reference an existing file at some indeterminate point in the past. <span class="Dv">P_tmpdir</span> is defined in the include file #include <stdio.h> If the argument \c str is non- <span class="Dv">NULL</span>, the file name is copied to the buffer it references. Otherwise, the file name is copied to a static buffer. In either case, tmpnam returns a pointer to the file name. \n \n The buffer referenced by \c str is expected to be at least <span class="Dv">L_tmpnam</span> bytes in length. <span class="Dv">L_tmpnam</span> is defined in the include file #include <stdio.h> \n \n The tempnam function is similar to tmpnam , but provides the ability to specify the directory which will contain the temporary file and the file name prefix. \n \n The environment variable <span class="Ev">TMPDIR</span> (if set), the argument \c tmpdir (if non- <span class="Dv">NULL</span>), the directory <span class="Dv">P_tmpdir</span>, and the directory <span class="Pa">/tmp</span> are tried, in the listed order, as directories in which to store the temporary file. \n \n The argument \c prefix, if non- <span class="Dv">NULL</span>, is used to specify a file name prefix, which will be the first part of the created file name. The tempnam function allocates memory in which to store the file name; the returned pointer may be used as a subsequent argument to free.

Return Values

Errors

Security Considerations

Compatibility