TMPNAM(3) Linux Programmer's Manual TMPNAM(3)
NAME
tmpnam - create a name for a temporary file
SYNOPSIS
#include<stdio.h>
char*tmpnam(char*s);
DESCRIPTION
The 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 s is NULL this name is generated
in an internal static buffer and may be overwritten by the next call to
tmpnam(). If s is not NULL, the name is copied to the character array
(of length at least L_tmpnam) pointed at by s and the value s is
returned in case of success.
The path name that is created, has a directory prefix P_tmpdir. (Both
L_tmpnam and P_tmpdir are defined in <stdio.h>, just like the TMP_MAX
mentioned below.)
RETURNVALUE
The tmpnam() function returns a pointer to a unique temporary filename,
or NULL if a unique name cannot be generated.
ERRORS
No errors are defined.
NOTES
Portable applications that use threads cannot call tmpnam() with NULL
parameter if either _POSIX_THREAD_SAFE_FUNCTIONS or _POSIX_THREADS is
defined.
The tmpnam() function generates a different string each time it is
called, up to TMP_MAX times. If it is called more than TMP_MAX times,
the behaviour is implementation defined.
BUGS
Never use this function. Use mkstemp(3) instead.
CONFORMINGTO
SVID 2, POSIX, BSD 4.3, ISO 9899
SEEALSO
mktemp(3), mkstemp(3), tempnam(3), tmpfile(3)
1999-06-14 TMPNAM(3)
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