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} 31