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TMPFILE(3)							    TMPFILE(3)

NAME
       tempnam, tmpfile, tmpnam - temporary file routines

SYNOPSIS
       #include <stdio.h>

       FILE *
       tmpfile(void);

       char *
       tmpnam(char *str);

       char *
       tempnam(const char *tmpdir, const char *prefix);

DESCRIPTION
       Tmpfile	opens  a  file using a file name generated by the routine tmp‐
       nam(3), and returns a pointer to the stream associated with  the	 file.
       The  created  file is unlinked before tmpfile returns, causing the con‐
       tents of the file to be deleted automatically when the  last  reference
       to  it is closed.  The file is opened with the access value ``w+''.  If
       tmpnam returns NULL, or if tmpfile is unable to open the file,  a  NULL
       pointer is returned.

       Tmpnam returns a pointer to a file name, in the directory ``/usr/tmp'',
       which did not reference an existing file at some indeterminate point in
       the  past.   If the argument s is non-NULL, this file name is copied to
       the buffer it references.  Otherwise, memory to contain this file  name
       is  allocated  by  tmpnam.  In either case, tmpnam returns a pointer to
       the file name; in the latter case, the return value may be  used	 as  a
       subsequent argument to free(3).

       In  the	current implementation, the memory buffer referenced by s must
       be at least 16 bytes long.

       Tempnam is similar to tmpnam, but provides the ability to  specify  the
       directory  which will contain the temporary file and the file name pre‐
       fix.

       The environmental variable ``TMPDIR'' (if set), the  argument  dir  (if
       non-NULL),  the	directory  ``/usr/tmp'' and the directory ``/tmp'' are
       tried, in the listed order, as directories in which to store the tempo‐
       rary  file.   Tempnam allocates memory in which to store the file name;
       the returned pointer may be used as a subsequent argument  to  free(3).
       The  argument  prefix, if non-NULL, is used to specify a file name pre‐
       fix, which will be the first part of the created file name.

       Tmpnam and tempname return a NULL pointer if unable to allocate	memory
       or find a file which may be created.

       The manifest constants ``TMP_MAX'', ``P_tmpdir'' and ``L_tmpnam'', doc‐
       umented for the routines tmpnam and tempnam in other systems,  are  not
       available  in  this  implementation.  If the source code requires them,
       simply use:

	      #define	TMP_MAX	       308915776
	      #define	P_tmpdir       "/usr/tmp"
	      #define	L_tmpnam       1024

BUGS
       These interfaces are provided for System	 V  compatibility  only.   The
       mkstemp(3) interface is strongly preferred.

       There  are  three  important problems with these interfaces (as well as
       with the historic mktemp(3) interface).	First,	there  is  an  obvious
       race  between  file  name  selection  and  file creation.  Second, most
       implementations provide only a limited number (usually 26) of  possible
       temporary  file	names  before  file  names  will start being recycled.
       Third, the System V implementations of these functions (and mktemp) use
       the  access(2)  system  call  to determine whether or not the temporary
       file may be created.  This has obvious ramifications for setuid or set‐
       gid programs, complicating the portable use of these interfaces in such
       programs.

       The mkstemp(3) interface has none  of  these  problems;	the  mktemp(3)
       implementation  in  this	 system	 suffers  only from the race condition
       described above.

       The tmpfile interface should not be used if there  is  any  possibility
       that  the user does not wish the temporary file to be publicly readable
       or writable.

SEE ALSO
       fopen(3), mkstemp(3), mktemp(3)

4.4 Berkeley Distribution	 June 22, 1990			    TMPFILE(3)
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