V8/usr/man/man3/mktemp.3

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.TH MKTEMP 3 
.SH NAME
mktemp, tmpnam \- make a unique file name
.SH SYNOPSIS
.nf
.B char *mktemp(template)
.B char *template;
.PP
.B #include <stdio.h>
.PP
.B char *tmpnam(s)
.B char s[L_tmpnam];
.fi
.SH DESCRIPTION
.I Mktemp
replaces
.I template
by a unique file name, and returns the
address of the template.
The template should look like a file name with six trailing
X's, which will be replaced with the
current process id and a unique letter.
.PP
.I Tmpnam
places in the string pointed to by
.I s
a unique file name referring to a standard directory 
for temporary files (/tmp) and returns
.I s.
If
.I s
is 0,
.I tmpnam
returns the address of a fixed internal buffer that contains the name.
(Note: it is bad form to leave files in the temporary directory.)
.SH "SEE ALSO"
getuid(2) for
.I getpid
.SH BUGS
.I Tmpnam
should not be tied to
.IR stdio (3).