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MKTEMP
!!!MKTEMP
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTE
BUGS
SEE ALSO
----
!!NAME


mktemp - make a unique temporary file name
!!SYNOPSIS


__#include
__''template''__);
__
!!DESCRIPTION


The __mktemp()__ 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. Since it will be
modified, ''template'' must not be a string constant, but
should be declared as a character array.
!!RETURN VALUE


The __mktemp()__ function returns NULL on error
(''template'' did not end in XXXXXX) and ''template''
otherwise. If the call was successful, the last six bytes of
''template'' will have been modified in such a way that
the resulting name is unique (does not exist already). If
the call was unsuccessful, ''template'' is made an empty
string.
!!ERRORS


__EINVAL__


The last six characters of ''template'' were not
XXXXXX.
!!CONFORMING TO


BSD 4.3. POSIX dictates tmpnam(3).
!!NOTE


The prototype is in '''' for libc4,
libc5, glibc1; glibc2 follows the Single Unix Specification
and has the prototype in
''''.
!!BUGS


Never use __mktemp()__. Some implementations follow BSD
4.3 and replace XXXXXX by the current process id and a
single letter, so that at most 26 different names can be
returned. Since on the one hand the names are easy to guess,
and on the other hand there is a race between testing
whether the name exists and opening the file, every use of
__mktemp()__ is a security risk. The race is avoided by
mkstemp(3).
!!SEE ALSO


mkstemp(3), tempnam(3), tmpfile(3),
tmpnam(3)
----

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Last edited on Tuesday, June 4, 2002 12:24:28 am by "perry"

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