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From: mini@giants.wpd.sgi.com (Mark Minnihan)
Newsgroups: comp.lang.c++
Subject: fstream problems
Message-ID: <1991Feb6.021342.24547@odin.corp.sgi.com>
Date: 6 Feb 91 02:13:42 GMT
Sender: news@odin.corp.sgi.com (Net News)
Reply-To: mini@giants.wpd.sgi.com (Mark Minnihan)
Organization: sgi
Lines: 27

I'm having a problem with the AT&T iostream library that I haven't been
able to solve.  The scenario is as follows :

fstream my_stream("/tmp/foo",ios::out);

my_stream.seekg(100000);

my_stream << "DUMMY LINE" << endl;

my_stream.close();

My problem results when the write fails( insufficient disk space,etc ).
When I query the status of the stream with "my_stream.fail()", I do not
get an error condition.  However, if I get the file descriptor from the
stream and use it to call the "write" system call, the write returns -1
as expected.  I should add that when using my_stream to attempt the
writes, "/tmp/foo" is created as a zero length file if there is
insufficient disk space.  Given that I would like to use fstream and
not the file descriptor, how do I catch these types of errors.
Needless to say, your help is greatly appreciated.


-- 

                                 thanks,

                                    Mark Minnihan