Name
mktemp — make a unique temporary filename
Synopsis
#include <stdlib.h>
char
*mktemp( |
char * | template); |
![[Note]](../stylesheet/note.png) |
Note | ||
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DESCRIPTION
The mktemp() function
generates a unique temporary filename from template. The last six
characters of template must be XXXXXX and
these are replaced with a string that makes the filename
unique. Since it will be modified, template must not be a string
constant, but should be declared as a character array.
RETURN VALUE
The mktemp() function always
returns template. If
a unique name was created, the last six bytes of template will have been
modified in such a way that the resulting name is unique
(i.e., does not exist already) If a unique name could not be
created, template is
made an empty string.
NOTES
The prototype is in <unistd.h>
for libc4, libc5, glibc1; glibc2 follows the Single Unix
Specification and has the prototype in <stdlib.h>
BUGS
Never use mktemp(). Some
implementations follow 4.3BSD and replace XXXXXX by the
current process ID and a single letter, so that at most 26
different names can be returned. Since on the one hand the
names are easy to guess, and on the other hand there is a
race between testing whether the name exists and opening the
file, every use of mktemp() is
a security risk. The race is avoided by mkstemp(3).
COLOPHON
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright (C) 1993 David Metcalfe (davidprism.demon.co.uk) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Sat Jul 24 18:48:06 1993 by Rik Faith (faithcs.unc.edu) Modified Fri Jun 23 01:26:34 1995 by Andries Brouwer (aebcwi.nl) (prompted by Scott Burkett <scottbIntNet.net>) Modified Sun Mar 28 23:44:38 1999 by Andries Brouwer (aebcwi.nl) |