Poul-Henning Kamp wrote: > In message <[EMAIL PROTECTED]>, John Baldwin writes: > > >+ frame = td->td_frame; > >+ frame->tf_eax = retval; /* Child returns zero */ > >+ frame->tf_edx = aux; /* I dunno */ > > > >You could always ask about that instead of having a I dunno comment. :) > >I think that we no longer use 2 return values from syscalls for FreeBSD > >syscalls (I know we did for fork1() at one point, possibly still do > >so that 4.x libc works ok on 5.x kernel). Linux does depend on edx being > >preserved across a syscall though IIRC. > > We do for 64bit returns like lseek(2)
And also pipe(2) has a dual return from the syscall itself. libc massages this into something that C programs like. Cheers, -Peter -- Peter Wemm - [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED] "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
