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MKTEMP(3)                  Linux Programmer's Manual                 MKTEMP(3)

NAME
       mktemp - make a unique temporary file name

SYNOPSIS
       #include <stdlib.h>

       char *mktemp(char *template);

DESCRIPTION
       The mktemp() function generates a unique temporary file name 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 returns NULL on error (template did not end in
       XXXXXX) and template otherwise.  If the call was successful, the last
       six bytes of template will have been modified in such a way that the
       resulting name is unique (does not exist already). If the call was
       unsuccessful, template is made an empty string.

ERRORS
       EINVAL The last six characters of template were not XXXXXX.

CONFORMING TO
       BSD 4.3. POSIX dictates tmpnam(3).

NOTE
       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 BSD 4.3 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).

SEE ALSO
       mkstemp(3), tempnam(3), tmpfile(3), tmpnam(3)

GNU                               1993-04-03                         MKTEMP(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTE | BUGS | SEE ALSO

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