This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
Re: RFC: reject unknown open flags
On 03/30/2017 11:19 AM, Linus Torvalds wrote:
like "dd" growing an atomic flag and setting it on stdout),
'dd' typically assumes that if a flag O_FOO is not #defined by
<fcntl.h>, then 'dd' can "#define O_FOO 0" and the rest of dd's code can
assume O_FOO works "well enough" on older systems. I hope this
backward-compatibility hack will suffice for O_ATOMIC too.
I'm assuming you'd also possible want to be able to use F_SETFL to set
O_ATOMIC after the fact
Just for fun, one thread can set O_ATOMIC at the same time another
thread is doing a 'write'....