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

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

       tmpfile - create a temporary file

       #include <stdio.h>

       FILE *tmpfile(void);

       The  tmpfile() function shall create a temporary file and open a corresponding stream. The
       file shall be automatically deleted when all references to the file are closed.	The  file
       is opened as in fopen() for update (w+).

       In  some  implementations, a permanent file may be left behind if the process calling tmp-
       file() is killed while it is processing a call to tmpfile().

       An error message may be written to standard error if the stream cannot be opened.

       Upon successful completion, tmpfile() shall return a pointer to the  stream  of	the  file
       that  is  created.  Otherwise, it shall return a null pointer	and set errno to indicate
       the error.

       The tmpfile() function shall fail if:

       EINTR  A signal was caught during tmpfile().

       EMFILE {OPEN_MAX} file descriptors are currently open in the calling process.

       ENFILE The maximum allowable number of files is currently open in the system.

       ENOSPC The directory or file system which would contain the new file cannot be expanded.

	      The file is a regular file and the size of the file cannot be represented correctly
	      in an object of type off_t.

       The tmpfile() function may fail if:

       EMFILE {FOPEN_MAX} streams are currently open in the calling process.

       ENOMEM Insufficient storage space is available.

       The following sections are informative.

   Creating a Temporary File
       The  following  example	creates  a  temporary file for update, and returns a pointer to a
       stream for the created file in the fp variable.

	      #include <stdio.h>
	      FILE *fp;

	      fp = tmpfile ();

       It should be possible to open at least {TMP_MAX} temporary files during	the  lifetime  of
       the  program  (this limit may be shared with tmpnam()) and there should be no limit on the
       number simultaneously open other than this limit and any limit on the number of open files
       ( {FOPEN_MAX}).



       fopen()	,  tmpnam()  ,	unlink()  ,  the Base Definitions volume of IEEE Std 1003.1-2001,

       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				       TMPFILE(P)

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