Implement shm_attach_to_open_removed() for OpenBSD
Add implementation which had been left by
0cfe2089 (Add runtime handlers for
97900ebf for FreeBSD/DragonFlyBSD).
This implementation is based on what
97900ebf (shm: have os remove shared memory if fio dies unexpectedly)
says. There seems to be no easy way to statically test versions like
KERNEL_VERSION() in Linux kernel.
The code assumes major/minor are both < 10. The minor has never been
10 or above. The major won't be 10 anytime soon based on the past
release cycle (current version is 6.1 after more than 2 decades).
https://en.wikipedia.org/wiki/OpenBSD_version_history
--
# uname
OpenBSD
# uname -r
6.1
# cat ./test1.c
#include <stdio.h>
#include "./os/os.h"
#include "./os/os-openbsd.h"
int main(void) {
printf("%d\n", shm_attach_to_open_removed());
return 0;
}
# gcc -Wall -g ./test1.c
# ./a.out
1
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@fb.com>