Provided by: manpages-pt-dev_20040726-4_all
mkstemp - create a unique temporary file
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.
EINVAL The last six characters of template were not XXXXXX. Now
template is unchanged.
EEXIST Could not create a unique temporary filename. Now the contents
of template are undefined.
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.
The prototype is in <unistd.h> for libc4, libc5, glibc1; glibc2 follows
the Single Unix Specification and has the prototype in <stdlib.h>.
mktemp(3), tmpnam(3), tempnam(3), tmpfile(3)