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       mktemp - make a unique temporary file name


       #include <stdlib.h>

       char *mktemp(char *template);


       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.


       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.


       EINVAL The last six characters of template were not XXXXXX.


       BSD 4.3. POSIX dictates tmpnam(3).


       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  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).


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