#include <stdlib.h>

       int mkstemp(char *template);

       int mkostemp(char *template, int flags);

       int mkstemps(char *template, int suffixlen);

       int mkostemps(char *template, int suffixlen, int flags);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
           || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200112L

       mkostemp(): _GNU_SOURCE
       mkstemps(): _BSD_SOURCE || _SVID_SOURCE
       mkostemps(): _GNU_SOURCE

       The mkstemp() function generates a unique temporary filename from  tem-
       plate,  creates and opens the file, and returns an open file descriptor
       for the file.

       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 file is created with permissions 0600, that is, read plus write for
       owner only.  The returned file descriptor provides both read and  write
       access  to  the file.  The file is opened with the open(2) O_EXCL flag,
       guaranteeing that the caller is the process that creates the file.

       The mkostemp() function is like mkstemp(),  with  the  difference  that
       flags  as  for  open(2)  may  be  specified  in  flags (e.g., O_APPEND,

       The mkstemps() function is like mkstemp(), except that  the  string  in
       template  contains a suffix of suffixlen characters.  Thus, template is
       of the form prefixXXXXXXsuffix, and the string XXXXXX  is  modified  as
       for mkstemp().

       The   mkostemps()  function  is  to  mkstemps()  as  mkostemp()  is  to

       On success, these functions return the file descriptor of the temporary
       file.  On error, -1 is returned, and errno is set appropriately.


       mkostemp() is available since glibc 2.7.   mkstemps()  and  mkostemps()
       are available since glibc 2.11.

       mkstemp(): 4.3BSD, POSIX.1-2001.

       mkstemps(): unstandardized, but appears on several other systems.

       mkostemp() and mkostemps(): are glibc extensions.

       In  glibc  versions  2.06 and earlier, the file is created with permis-
       sions 0666, that is, read and write for all users.  This  old  behavior
       may  be  a security risk, especially since other UNIX flavors use 0600,
       and  somebody  might  overlook  this  detail  when  porting   programs.
       POSIX.1-2008  adds  a  requirement  that  the file be created with mode

       More generally, the POSIX specification of mkstemp() does not say  any-
       thing  about  file  modes, so the application should make sure its file
       mode creation mask (see umask(2)) is set appropriately  before  calling
       mkstemp() (and mkostemp()).

       The  prototype  for mktemp() is in <unistd.h> for libc4, libc5, glibc1;
       glibc2 follows POSIX.1 and has the prototype in <stdlib.h>.

       mkdtemp(3), mktemp(3), tempnam(3), tmpfile(3), tmpnam(3)

       This page is part of release 3.54 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at

GNU                               2012-12-21                        MKSTEMP(3)
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