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-'\" t
-.\" Copyright (c) 1999 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2003-11-15, aeb, added tmpnam_r
-.\"
-.TH tmpnam 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-tmpnam, tmpnam_r \- create a name for a temporary file
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.P
-.BI "[[deprecated]] char *tmpnam(char *" s );
-.BI "[[deprecated]] char *tmpnam_r(char *" s );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR tmpnam_r ()
-.nf
- Since glibc 2.19:
- _DEFAULT_SOURCE
- Up to and including glibc 2.19:
- _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-.B Note:
-avoid using these functions; use
-.BR mkstemp (3)
-or
-.BR tmpfile (3)
-instead.
-.P
-The
-.BR tmpnam ()
-function returns a pointer to a string that is a valid filename,
-and such that a file with this name did not exist at some point
-in time, so that naive programmers may think it
-a suitable name for a temporary file.
-If the argument
-.I s
-is NULL, this name is generated in an internal static buffer
-and may be overwritten by the next call to
-.BR tmpnam ().
-If
-.I s
-is not NULL, the name is copied to the character array (of length
-at least
-.IR L_tmpnam )
-pointed to by
-.I s
-and the value
-.I s
-is returned in case of success.
-.P
-The created pathname has a directory prefix
-.IR P_tmpdir .
-(Both
-.I L_tmpnam
-and
-.I P_tmpdir
-are defined in
-.IR <stdio.h> ,
-just like the
-.B TMP_MAX
-mentioned below.)
-.P
-The
-.BR tmpnam_r ()
-function performs the same task as
-.BR tmpnam (),
-but returns NULL (to indicate an error) if
-.I s
-is NULL.
-.SH RETURN VALUE
-These functions return a pointer to a unique temporary
-filename, or NULL if a unique name cannot be generated.
-.SH ERRORS
-No errors are defined.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR tmpnam ()
-T} Thread safety MT-Unsafe race:tmpnam/!s
-T{
-.na
-.nh
-.BR tmpnam_r ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-.TP
-.BR tmpnam ()
-C11, POSIX.1-2008.
-.TP
-.BR tmpnam_r ()
-None.
-.SH HISTORY
-.TP
-.BR tmpnam ()
-SVr4, 4.3BSD, C89, POSIX.1-2001.
-Obsolete in POSIX.1-2008.
-.TP
-.BR tmpnam_r ()
-Solaris.
-.SH NOTES
-The
-.BR tmpnam ()
-function generates a different string each time it is called,
-up to
-.B TMP_MAX
-times.
-If it is called more than
-.B TMP_MAX
-times,
-the behavior is implementation defined.
-.P
-Although these functions generate names that are difficult to guess,
-it is nevertheless possible that between the time that
-the pathname is returned and the time that the program opens it,
-another program might create that pathname using
-.BR open (2),
-or create it as a symbolic link.
-This can lead to security holes.
-To avoid such possibilities, use the
-.BR open (2)
-.B O_EXCL
-flag to open the pathname.
-Or better yet, use
-.BR mkstemp (3)
-or
-.BR tmpfile (3).
-.P
-Portable applications that use threads cannot call
-.BR tmpnam ()
-with a NULL argument if either
-.B _POSIX_THREADS
-or
-.B _POSIX_THREAD_SAFE_FUNCTIONS
-is defined.
-.SH BUGS
-Never use these functions.
-Use
-.BR mkstemp (3)
-or
-.BR tmpfile (3)
-instead.
-.SH SEE ALSO
-.BR mkstemp (3),
-.BR mktemp (3),
-.BR tempnam (3),
-.BR tmpfile (3)