MKTEMP(3) NEWLIB MKTEMP(3)NAME
4.41 `mktemp', `mkstemp', `mkstemps'--generate unused file name
SYNOPSIS
#include <stdlib.h>
char *mktemp(char *PATH);
char *mkdtemp(char *PATH);
int mkstemp(char *PATH);
int mkstemps(char *PATH, int SUFFIXLEN);
char *_mktemp_r(struct _reent *REENT, char *PATH);
char *_mkdtemp_r(struct _reent *REENT, char *PATH);
int *_mkstemp_r(struct _reent *REENT, char *PATH);
int *_mkstemps_r(struct _reent *REENT, char *PATH, int LEN);
DESCRIPTION
`mktemp', `mkstemp', and `mkstemps' attempt to generate a file name
that is not yet in use for any existing file. `mkstemp' and `mkstemps'
create the file and open it for reading and writing; `mktemp' simply
generates the file name (making `mktemp' a security risk). `mkdtemp'
attempts to create a directory instead of a file, with a permissions
mask of 0700.
You supply a simple pattern for the generated file name, as the
string at PATH. The pattern should be a valid filename (including path
information if you wish) ending with at least six ``X'' characters.
The generated filename will match the leading part of the name you sup‐
ply, with the trailing ``X'' characters replaced by some combination of
digits and letters. With `mkstemps', the ``X'' characters end SUF‐
FIXLEN bytes before the end of the string.
The alternate functions `_mktemp_r', `_mkdtemp_r', `_mkstemp_r', and
`_mkstemps_r' are reentrant versions. The extra argument REENT is a
pointer to a reentrancy structure.
RETURNS
`mktemp' returns the pointer PATH to the modified string representing
an unused filename, unless it could not generate one, or the pattern
you provided is not suitable for a filename; in that case, it returns
`NULL'.
`mkdtemp' returns the pointer PATH to the modified string if the
directory was created, otherwise it returns `NULL'.
`mkstemp' and `mkstemps' return a file descriptor to the newly cre‐
ated file, unless it could not generate an unused filename, or the pat‐
tern you provided is not suitable for a filename; in that case, it
returns `-1'.
PORTABILITY
ANSI C does not require either `mktemp' or `mkstemp'; the System V
Interface Definition requires `mktemp' as of Issue 2. POSIX 2001
requires `mkstemp', and POSIX 2008 requires `mkdtemp', but `mkstemps'
is not standardized.
Supporting OS subroutines required: `getpid', `mkdir', `open',
`stat'.
SEE ALSOmktemp is part of the library. The full documentation for is main‐
tained as a Texinfo manual. If info and are properly installed at your
site, the command
info
will give you access to the complete manual.
NEWLIB April 2010 MKTEMP(3)
