MKTEMP(3) Library Functions Manual MKTEMP(3)NAME
mktemp - make a unique file name
Mktemp replaces template by a unique file name, and returns the address of the template. The template should look like a file name with
six trailing X's, which will be replaced with the current process id and a unique letter.
SEE ALSO getpid(2)MKTEMP(3)
Check Out this Related Man Page
MKTEMP(3) Linux Programmer's Manual MKTEMP(3)NAME
mktemp - make a unique temporary filename
char *mktemp(char *template);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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
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.
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, and errno is set to indicate the error.
EINVAL The last six characters of template were not XXXXXX.
4.3BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of mktemp().
The prototype is in <unistd.h> for libc4, libc5, glibc1; glibc2 follows the Single UNIX Specification and has the prototype in <stdlib.h>.
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 test-
ing whether the name exists and opening the file, every use of mktemp() is a security risk. The race is avoided by mkstemp(3).
SEE ALSO mkstemp(3), tempnam(3), tmpfile(3), tmpnam(3)COLOPHON
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be found at http://www.kernel.org/doc/man-pages/.
GNU 2013-04-19 MKTEMP(3)