MKSTEMP(3)

NAME
       mkstemp - create a unique temporary file

SYNOPSIS
       #include <<unistd.h>>

       int mkstemp(char *template);

DESCRIPTION
       The  mkstemp()  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.  The file is then created  with
       mode read/write and permissions 0666 (glibc 2.0.6 and ear-
       lier), 0600 (glibc 2.0.7 and later).

RETURN VALUE
       The mkstemp() function returns the file descriptor  fd  of
       the temporary file.

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

       EEXIST The temporary file is not unique.

BUGS
       The old behaviour (creating a file with mode 0666) may  be
       a  security risk, especially since other Unix flavours use
       0600, and somebody might overlook this detail when porting
       programs.

CONFORMING TO
       BSD 4.3

SEE ALSO
       mktemp(3) tmpnam(3) tempnam(3) tmpfile(3)