1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
'\" t
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH mkdtemp 3 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
mkdtemp \- create a unique temporary directory
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.B #include <stdlib.h>
.P
.BI "char *mkdtemp(char *" template );
.fi
.P
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.P
.BR mkdtemp ():
.nf
/* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc 2.19 and earlier: */ _BSD_SOURCE
|| /* Since glibc 2.10: */ _POSIX_C_SOURCE >= 200809L
.fi
.SH DESCRIPTION
The
.BR mkdtemp ()
function generates a uniquely named temporary
directory from
.IR template .
The last six characters of
.I 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,
.I template
must not be a string constant, but should be declared as a character array.
.SH RETURN VALUE
The
.BR mkdtemp ()
function returns a pointer to the modified template
string on success, and NULL on failure, in which case
.I errno
is set to indicate the error.
.SH ERRORS
.TP
.B EINVAL
The last six characters of
.I template
were not XXXXXX.
Now
.I template
is unchanged.
.P
Also see
.BR mkdir (2)
for other possible values for
.IR errno .
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.na
.nh
.BR mkdtemp ()
T} Thread safety MT-Safe
.TE
.SH STANDARDS
POSIX.1-2008.
.SH HISTORY
glibc 2.1.91.
NetBSD 1.4.
POSIX.1-2008.
.SH SEE ALSO
.BR mktemp (1),
.BR mkdir (2),
.BR mkstemp (3),
.BR mktemp (3),
.BR tempnam (3),
.BR tmpfile (3),
.BR tmpnam (3)
|
