mktemp

Syntax

#include <stdio.h> char *mktemp(char *template);

Description

template is a file specification that ends with six trailing X characters. This function replaces the XXXXXX with a set of characters such that the resulting file name names a nonexisting file.

Note that since MS-DOS is limited to eight characters for the file name, and since none of the X's get replaced by a dot, you can only have two additional characters before the X's.

Return Value

If a unique name cannot be chosen, NULL is returned. Otherwise the resulting filename is returned.

Portability

ANSI/ISO C	No
POSIX	No

Example

char template[] = "/tmp/ccXXXXXX"; if (mktemp(template) != NULL) { FILE *q = fopen(template, "w"); ... }