On 2009-03-18 09:43Z, Corinna Vinschen wrote: > On Mar 17 21:15, Charles Wilson wrote: >> Is there a cygwin analogue to the msvc _set_fmode()? That is, a function >> that sets the default mode of fopen, even if you don't explicitly >> specify it "rb" or whatever. >> >> Obviously, there's "use binary (or text) mounts". Less obviously, you >> can link against /usr/lib/binary.o (or -lbinmode), or text.o (or >> automode.o or textreadmode.o and the similar .a's). But I'm looking for >> an actual function call to replace the following code in libarchive: >> >> +#if defined(_WIN32) && !defined(__CYGWIN__) > > The !defined(__CYGWIN__) is not necessary because gcc for Cygwin doesn't > define _WIN32. > >> /* Make sure open() function will be used with a binary mode. */ >> /* on cygwin, we need something similar, but instead link against */ >> /* a special startup object, binmode.o */ >> _set_fmode(_O_BINARY); >> #endif >> >> I'm using binmode.o at present, but I'd prefer to just make a func call >> at the same place the WIN32-specific code does. (FWIW, you can't call >> the w32api _set_fmode() function and expect it to work; the msvc runtime >> and cygwin maintain different default _fmode variables). > > Cygwin has no such function call except for the per-descriptor function > setmode (fd, mode). IMHO using binmode.o is much more elegant. The > only other choice you have is this: > > extern int _fmode; > _fmode = O_BINARY; > > _fmode is defined in crt0.o so you can simply access it if you like. > But anyway, using binmode.o is much more elegant, IMHO. I don't see > what speaks against using it.
If a drop-in replacement for _set_fmode() is nonetheless still wanted, then _mingw32_init_fmode() here: http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/mingw/crt1.c?cvsroot=src might provide ideas for implementing it (or reasons to avoid it: for example, standard streams would already have been opened before such a function could be called). An alternative that keeps all toolchains working the same way is to link with 'binmode.o' for Cygwin, and 'Binmode.obj' for msvc: http://msdn.microsoft.com/en-us/library/ee2849wt(VS.80).aspx if it's acceptable to change the upstream package. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
