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Linux Programmer's Manual (3)
mktemp - make a unique temporary filename
char *mktemp(char *template);
Feature Test Macro Requirements for glibc (see
- Since glibc 2.12:
_BSD_SOURCE || _SVID_SOURCE ||
(_XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) &&
!(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
- Before glibc 2.12:
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
Never use this function
function generates a unique temporary filename
The last six characters of template must
be XXXXXX and these are replaced with a string that makes the
Since it will be modified,
must not be a string constant, but should be declared as a character array.
function always returns template
If a unique name was created, the last six bytes of template
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,
is made an empty string, and
is set to indicate the error.
The last six characters of template were not XXXXXX.
POSIX.1-2008 removes the specification of
The prototype is in
for libc4, libc5, glibc1; glibc2 follows the Single UNIX Specification
and has the prototype in
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
is a security risk.
The race is avoided by
This page is part of release 3.66 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
- RETURN VALUE
- CONFORMING TO
- SEE ALSO
This document was created by
using the manual pages.
Time: 21:43:01 GMT, July 12, 2014