Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
MKSTEMP(3)                 Linux Programmer's Manual                MKSTEMP(3)

NAME
       mkstemp - create a unique temporary file

SYNOPSIS
       #include <stdlib.h>

       int mkstemp(char *template);

DESCRIPTION
       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.

RETURN VALUE
       The mkstemp() function returns the file descriptor fd of the temporary
       file or -1 on error.

ERRORS
       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.

NOTES
       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.

CONFORMING TO
       BSD 4.3, POSIX 1003.1-2001

NOTE
       The prototype is in _unistd.h_ for libc4, libc5, glibc1; glibc2 follows
       the Single Unix Specification and has the prototype in _stdlib.h_.

SEE ALSO
       mkdtemp(3), mktemp(3), tmpnam(3), tempnam(3), tmpfile(3)

GNU                               2001-12-23                        MKSTEMP(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | CONFORMING TO | NOTE | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=mkstemp&sektion=3&manpath=Red+Hat+Linux%2fi386+9>

home | help