View Source: mkstemp(3) - Waikato Linux Users Group

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


mkstemp - create a unique temporary file
!!SYNOPSIS


__#include
__''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.
!!BUGS


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.


Don't use this function, use tmpfile(3) instead. It's
better defined and more portable.
!!CONFORMING TO


BSD 4.3, SUSv2
!!NOTE


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


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

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

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