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mkostemp(3c)
Standard C Library Functions mkstemp(3C)
NAME
mkstemp, mkstemps, mkostemp, mkostemps - make a unique file name from a
template and open the file
SYNOPSIS
#include <stdlib.h>
int mkstemp(char *template);
int mkstemps(char *template, int slen);
#include <stdlib.h>
#include <fcntl.h>
int mkostemp(char *template, int flags);
int mkostemps(char *template, int slen, int flags);
DESCRIPTION
The mkstemp() function replaces the contents of the string pointed to
by template by a unique file name, and returns a file descriptor for
the file open for reading and writing. The function thus prevents any
possible race condition between testing whether the file exists and
opening it for use. The string in template should look like a file name
with six trailing 'X's; mkstemp() replaces each 'X' with a character
from the portable file name character set. The characters are chosen
such that the resulting name does not duplicate the name of an existing
file.
The mkstemps() function behaves the same as mkstemp(), except it per‐
mits a suffix to exist in the template. The template should be of the
form /tmp/tmpXXXXXXsuffix. The slen parameter specifies the length of
the suffix string.
The mkostemp() and mkostemps() functions behave the same as mkstemp()
and mkstemps() functions respectively, except that they take a flags
parameter to specify flags to be passed to open(2) in addition to the
default O_CREAT | O_EXCL | O_RDWR flags.
RETURN VALUES
Upon successful completion, these functions return an open file
descriptor. Otherwise −1 is returned if no suitable file could be cre‐
ated.
ERRORS
These functions can set errno to the same values as lstat(2) and
open(2).
USAGE
It is possible to run out of letters.
These functions do not check to determine whether the file name part of
template exceeds the maximum allowable file name length.
These functions are frequently used to create a temporary file that
will be removed by the application before the application terminates.
The tmpfile(3C) function is preferred over the mkstemp() function for
creating temporary files when control is not needed over the path,
name, and flags used to open(2) the file.
These functions have transitional interfaces for 64-bit file offsets.
See lf64(7).
The mkostemp() and mkostemps() functions allow atomically applying the
O_CLOEXEC and O_CLOFORK flags to the file descriptor when it is cre‐
ated, with no opportunity for other threads to call functions in the
fork or exec families between the open() call and a call to fcntl() to
set such flags, thus aiding in thread safety.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ StandardSee below.
See standards(7) for descriptions of the following standards:
tab() box; cw(2.2i) |cw(3.3i) lw(2.2i) |lw(3.3i) INTERFACESAPPLICABLE
STANDARDS _
mkstemp()
T{
POSIX.1-2001 through 2008,
SUS through SUSv4,
XPG4v2 through XPG7
T} _ T{
mkstemps()
mkostemp()
mkostemps()
T} None
SEE ALSO
getpid(2), open(2), mktemp(3C), tmpfile(3C), attributes(7), lf64(7),
standards(7)
HISTORY
The mkstemp() function was added to SunOS in SunOS 4.0 and has been
included in all Sun and Oracle releases of Solaris.
The mkstemps() function was defined in OpenBSD 2.4, and was added to
Oracle Solaris in the Oracle Solaris 11.0 release.
The mkostemp() and mkostemps() functions were defined in GNU libc 2.11,
and were added to Oracle Solaris in the Oracle Solaris 11.4.15 release.
Oracle Solaris 11.4 5 Aug 2019 mkstemp(3C)