1#define _GNU_SOURCE
 2#include <string.h>
 3#include <stdlib.h>
 4#include <errno.h>
 5#include <sys/stat.h>
 6
 7char *mktemp(char *template)
 8{
 9	size_t l = strlen(template);
10	int retries = 100;
11	struct stat st;
12
13	if (l < 6 || memcmp(template+l-6, "XXXXXX", 6)) {
14		errno = EINVAL;
15		*template = 0;
16		return template;
17	}
18
19	do {
20		__randname(template+l-6);
21		if (stat(template, &st)) {
22			if (errno != ENOENT) *template = 0;
23			return template;
24		}
25	} while (--retries);
26
27	*template = 0;
28	errno = EEXIST;
29	return template;
30}