Filebuf equivalent ?

[Pinpoint]

Hi,

I need the Unix C++ equivalent of the Windows ifstream/ofstream filebuf setting, ie

os.open("file.dat", ios:ut, filebuf::sh_none) ;

Can anyone tell me if there is one, or some other way to ensure a file cannot be updated twice simultaneously ?

Thanks.

 

[danielhozac]

I'm not sure what you're after, but it sounds like file locking. If you are on a POSIX compliant system, you could accomplish this with a [tt]fcntl[/tt] call.

//Daniel

 

[ArkM]

As far as I know, filebuf::sh_none is not Windows feature, it was part of OLD (more than deptecated) stream library only. The C++ Standard totally ignores file sharing. I think, it's the most serious defect of C++ Std file i/o.
I think, it's impossible to write portable sharing stream file program in C++. Use old good C file i/o library (open or fopen etc). io.h's are non-standard headers, but are nearly identical on Win and Unix (in file sharing aspect).
I will be glad to read more optimistic words about true standard C++ stream file sharing. I was distressed when read C++ Standard file i/o part.