dd(1): neutralize SIGINT while non-async-signal safe code is executingHEADmain

making the SIGINT handler (the terminate() function) safe to execute at
any interruption moment.  This fixes a race in
5807f35c541c26bbd91a3ae12506cd8dd8f20688 where SIGINT delivered right
after the check_terminate() but before a blocking syscall would not
cause abort.

Do it by setting the in_io flag around potentially blocking io syscalls.
If handler sees the flag, it terminates the program.  Otherwise,
termination is delegated to the before_io/after_io fences.

Reviewed by:	Andrew Gierth <andrew@tao146.riddles.org.uk>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D40281

0 files changed, 0 insertions, 0 deletions