ofstream no longer has file permissions?

I'm porting some code from AIX's xlC compiler to gcc.  One of the
problems I'm banging my head against right now is this one particular
use of an of an ofstream.  The current call looks like:

ofstream fstrm(cstrFileName,ios::out,0640);
(cstrFileName is a Rogue Wave string, but that's not the issue,
because I can just use cstrFileName.data()).

The ofstream in gcc, and as far as I can tell the C++ standard, does
not have the third parameter for file permissions.  Am I missing
something?  There doesn't seem to be another way of ensuring the file
has the right permissions, is there?

Thanks in advance.



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