On Thu, Mar 30, 2017 at 11:19:53AM -0700, Linus Torvalds wrote: > So quite frankly, I'd much rather see that people who really want to > check would instead just > > fd = open(... O_ATOMIC); > if (fd < 0) > .. regular error handling .. > > /* Did we actually get O_ATOMIC? */ > if (!(O_ATOMIC & fnctl(fd, F_GETFL, NULL))) > .. warn about lack of O_ATOMIC .. > > because I suspect that you will find users that might *want* atomic > behavior, but in the absence of atomicity guarantees will want to > still be able to do IO. That would be nice, but still won't work as we blindly copy f_flags into F_GETFL, not even masking our internal FMODE_ bits.
