mkdtemp(3) Library Functions Manual mkdtemp(3)

mkdtemp - create a unique temporary directory

Standard C library (libc, -lc)

#include <stdlib.h>
char *mkdtemp(char *template);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):


    /* Since glibc 2.19: */ _DEFAULT_SOURCE
        || /* glibc 2.19 and earlier: */ _BSD_SOURCE
        || /* Since glibc 2.10: */ _POSIX_C_SOURCE >= 200809L

The mkdtemp() function generates a uniquely named temporary directory from template. The last six characters of template must be XXXXXX and these are replaced with a string that makes the directory name unique. The directory is then created with permissions 0700. Since it will be modified, template must not be a string constant, but should be declared as a character array.

The mkdtemp() function returns a pointer to the modified template string on success, and NULL on failure, in which case errno is set to indicate the error.

The last six characters of template were not XXXXXX. Now template is unchanged.

Also see mkdir(2) for other possible values for errno.

For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
mkdtemp () Thread safety MT-Safe


glibc 2.1.91. NetBSD 1.4. POSIX.1-2008.

mktemp(1), mkdir(2), mkstemp(3), mktemp(3), tempnam(3), tmpfile(3), tmpnam(3)

2024-05-02 Linux man-pages 6.9.1