Originální popis anglicky:
mkstemp - create a unique temporary file
Návod, kniha: Linux Programmer's Manual
#include <stdlib.h>
int mkstemp(char *template);
The
mkstemp() function generates a unique temporary file name from
template. The last six characters of
template must be XXXXXX and
these are replaced with a string that makes the filename unique. The file is
then created with mode read/write and permissions 0666 (glibc 2.0.6 and
earlier), 0600 (glibc 2.0.7 and later). Since it will be modified,
template must not be a string constant, but should be declared as a
character array. The file is opened with the O_EXCL flag, guaranteeing that
when
mkstemp returns successfully we are the only user.
The
mkstemp() function returns the file descriptor fd of the temporary
file or -1 on error.
- EEXIST
- Could not create a unique temporary filename. Now the
contents of template are undefined.
- EINVAL
- The last six characters of template were not XXXXXX.
Now template is unchanged.
The old behaviour (creating a file with mode 0666) may be a security risk,
especially since other Unix flavours use 0600, and somebody might overlook
this detail when porting programs.
More generally, the POSIX specification does not say anything about file modes,
so the application should make sure its umask is set appropriately before
calling
mkstemp.
BSD 4.3, POSIX 1003.1-2001
The prototype is in
<unistd.h> for libc4, libc5, glibc1; glibc2
follows the Single Unix Specification and has the prototype in
<stdlib.h>.
mkdtemp(3),
mktemp(3),
tempnam(3),
tmpfile(3),
tmpnam(3)
