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Linux 2.6 - man page for tempnam (linux section 3posix)

TEMPNAM(P)			    POSIX Programmer's Manual			       TEMPNAM(P)

NAME
       tempnam - create a name for a temporary file

SYNOPSIS
       #include <stdio.h>

       char *tempnam(const char *dir, const char *pfx);

DESCRIPTION
       The tempnam() function shall generate a pathname that may be used for a temporary file.

       The tempnam() function allows the user to control the choice of a directory. The dir argu-
       ment points to the name of the directory in which the file is to be created. If dir  is	a
       null  pointer  or points to a string which is not a name for an appropriate directory, the
       path prefix defined as P_tmpdir in the <stdio.h> header shall be used. If  that	directory
       is not accessible, an implementation-defined directory may be used.

       Many applications prefer their temporary files to have certain initial letter sequences in
       their names. The pfx argument should be used for this. This argument may be a null pointer
       or point to a string of up to five bytes to be used as the beginning of the filename.

       Some  implementations  of tempnam() may use tmpnam() internally.  On such implementations,
       if called more than {TMP_MAX} times in a single process, the behavior  is  implementation-
       defined.

RETURN VALUE
       Upon successful completion, tempnam() shall allocate space for a string, put the generated
       pathname in that space, and return a pointer to it. The pointer shall be suitable for  use
       in a subsequent call to free(). Otherwise, it shall return a null pointer and set errno to
       indicate the error.

ERRORS
       The tempnam() function shall fail if:

       ENOMEM Insufficient storage space is available.

       The following sections are informative.

EXAMPLES
   Generating a Pathname
       The following example generates a pathname for a temporary file in  directory  /tmp,  with
       the  prefix  file. After the filename has been created, the call to free() deallocates the
       space used to store the filename.

	      #include <stdio.h>
	      #include <stdlib.h>
	      ...
	      char *directory = "/tmp";
	      char *fileprefix = "file";
	      char *file;

	      file = tempnam(directory, fileprefix);
	      free(file);

APPLICATION USAGE
       This function only creates pathnames. It is the application's responsibility to create and
       remove  the  files.  Between  the time a pathname is created and the file is opened, it is
       possible for some other process to create a file with the same name. Applications may find
       tmpfile() more useful.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fopen()	, free() , open() , tmpfile() , tmpnam() , unlink() , the Base Definitions volume
       of IEEE Std 1003.1-2001, <stdio.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				       TEMPNAM(P)


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