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-.\" Copyright (c) 1988, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)tmpnam.3	8.2 (Berkeley) 11/17/93
-.\" $FreeBSD$
-.\"
-.Dd March 18, 2007
-.Dt TMPFILE 3
-.Os
-.Sh NAME
-.Nm tempnam ,
-.Nm tmpfile ,
-.Nm tmpnam
-.Nd temporary file routines
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdio.h
-.Ft FILE *
-.Fn tmpfile void
-.Ft char *
-.Fn tmpnam "char *str"
-.Ft char *
-.Fn tempnam "const char *tmpdir" "const char *prefix"
-.Sh DESCRIPTION
-The
-.Fn tmpfile
-function
-returns a pointer to a stream associated with a file descriptor returned
-by the routine
-.Xr mkstemp 3 .
-The created file is unlinked before
-.Fn tmpfile
-returns, causing the file to be automatically deleted when the last
-reference to it is closed.
-The file is opened with the access value
-.Ql w+ .
-The file is created in the directory determined by the environment variable
-.Ev TMPDIR
-if set.
-The default location if
-.Ev TMPDIR
-is not set is
-.Pa /tmp .
-.Pp
-The
-.Fn tmpnam
-function
-returns a pointer to a file name, in the
-.Dv P_tmpdir
-directory, which
-did not reference an existing file at some indeterminate point in the
-past.
-.Dv P_tmpdir
-is defined in the include file
-.In stdio.h .
-If the argument
-.Fa str
-is
-.Pf non- Dv NULL ,
-the file name is copied to the buffer it references.
-Otherwise, the file name is copied to a static buffer.
-In either case,
-.Fn tmpnam
-returns a pointer to the file name.
-.Pp
-The buffer referenced by
-.Fa str
-is expected to be at least
-.Dv L_tmpnam
-bytes in length.
-.Dv L_tmpnam
-is defined in the include file
-.In stdio.h .
-.Pp
-The
-.Fn tempnam
-function
-is similar to
-.Fn tmpnam ,
-but provides the ability to specify the directory which will
-contain the temporary file and the file name prefix.
-.Pp
-The environment variable
-.Ev TMPDIR
-(if set), the argument
-.Fa tmpdir
-(if
-.Pf non- Dv NULL ) ,
-the directory
-.Dv P_tmpdir ,
-and the directory
-.Pa /tmp
-are tried, in the listed order, as directories in which to store the
-temporary file.
-.Pp
-The argument
-.Fa prefix ,
-if
-.Pf non- Dv NULL ,
-is used to specify a file name prefix, which will be the
-first part of the created file name.
-The
-.Fn tempnam
-function
-allocates memory in which to store the file name; the returned pointer
-may be used as a subsequent argument to
-.Xr free 3 .
-.Sh RETURN VALUES
-The
-.Fn tmpfile
-function
-returns a pointer to an open file stream on success, and a
-.Dv NULL
-pointer
-on error.
-.Pp
-The
-.Fn tmpnam
-and
-.Fn tempfile
-functions
-return a pointer to a file name on success, and a
-.Dv NULL
-pointer
-on error.
-.Sh ENVIRONMENT
-.Bl -tag -width Ds
-.It Ev TMPDIR
-.Pf [ Fn tempnam
-only]
-If set,
-the directory in which the temporary file is stored.
-.Ev TMPDIR
-is ignored for processes
-for which
-.Xr issetugid 2
-is true.
-.El
-.Sh COMPATIBILITY
-These interfaces are provided from System V and
-.Tn ANSI
-compatibility only.
-.Pp
-Most historic implementations of these functions provide
-only a limited number of possible temporary file names
-(usually 26)
-before file names will start being recycled.
-System V implementations of these functions
-(and of
-.Xr mktemp 3 )
-use the
-.Xr access 2
-system call to determine whether or not the temporary file
-may be created.
-This has obvious ramifications for setuid or setgid programs,
-complicating the portable use of these interfaces in such programs.
-.Pp
-The
-.Fn tmpfile
-interface should not be used in software expected to be used on other systems
-if there is any possibility that the user does not wish the temporary file to
-be publicly readable and writable.
-.Sh ERRORS
-The
-.Fn tmpfile
-function
-may fail and set the global variable
-.Va errno
-for any of the errors specified for the library functions
-.Xr fdopen 3
-or
-.Xr mkstemp 3 .
-.Pp
-The
-.Fn tmpnam
-function
-may fail and set
-.Va errno
-for any of the errors specified for the library function
-.Xr mktemp 3 .
-.Pp
-The
-.Fn tempnam
-function
-may fail and set
-.Va errno
-for any of the errors specified for the library functions
-.Xr malloc 3
-or
-.Xr mktemp 3 .
-.Sh SEE ALSO
-.Xr mkstemp 3 ,
-.Xr mktemp 3
-.Sh STANDARDS
-The
-.Fn tmpfile
-and
-.Fn tmpnam
-functions
-conform to
-.St -isoC .
-.Sh SECURITY CONSIDERATIONS
-The
-.Fn tmpnam
-and
-.Fn tempnam
-functions are susceptible to a race condition
-occurring between the selection of the file name
-and the creation of the file,
-which allows malicious users
-to potentially overwrite arbitrary files in the system,
-depending on the level of privilege of the running program.
-Additionally, there is no means by which
-file permissions may be specified.
-It is strongly suggested that
-.Xr mkstemp 3
-be used in place of these functions.
-(See
-the FSA.)