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MKSTEMP(3P)			    POSIX Programmer's Manual			      MKSTEMP(3P)

PROLOG
       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME
       mkstemp - make a unique filename

SYNOPSIS
       #include <stdlib.h>

       int mkstemp(char *template);

DESCRIPTION
       The  mkstemp() function shall replace the contents of the string pointed to by template by
       a unique filename, and return a file descriptor for the file open for reading and writing.
       The  function  thus  prevents any possible race condition between testing whether the file
       exists and opening it for use. The string in template should look like a filename with six
       trailing  'X'  s;  mkstemp() replaces each 'X' with a character from the portable filename
       character set. The characters are chosen such that the resulting name does  not	duplicate
       the name of an existing file at the time of a call to mkstemp().

RETURN VALUE
       Upon  successful completion, mkstemp() shall return an open file descriptor. Otherwise, -1
       shall be returned if no suitable file could be created.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
   Generating a Filename
       The following example creates a file with a 10-character name beginning with  the  charac-
       ters "file" and opens the file for reading and writing. The value returned as the value of
       fd is a file descriptor that identifies the file.

	      #include <stdlib.h>
	      ...
	      char template[] = "/tmp/fileXXXXXX";
	      int fd;

	      fd = mkstemp(template);

APPLICATION USAGE
       It is possible to run out of letters.

       The mkstemp() function need not check to determine whether the filename part  of  template
       exceeds the maximum allowable filename length.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       getpid(),    open(),    tmpfile(),    tmpnam(),	  the	 Base	Definitions   volume   of
       IEEE Std 1003.1-2001, <stdlib.h>

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				      MKSTEMP(3P)
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