git: d0af970e3ce4 - main - sysv shm: Fix SHM_REMAP flag value
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Date: Fri, 04 Oct 2024 20:35:05 UTC
The branch main has been updated by brooks: URL: https://cgit.FreeBSD.org/src/commit/?id=d0af970e3ce4a7e2108a4bc2442c6c98f6aa4ffa commit d0af970e3ce4a7e2108a4bc2442c6c98f6aa4ffa Author: Brooks Davis <brooks@FreeBSD.org> AuthorDate: 2024-10-04 20:34:03 +0000 Commit: Brooks Davis <brooks@FreeBSD.org> CommitDate: 2024-10-04 20:34:03 +0000 sysv shm: Fix SHM_REMAP flag value SHM_REMAP was incorrectly defined to 030000 which collides with SHM_RDONLY and SHM_RND. Renumber to 040000 (incidentally matching Linux). This is an ABI break, but the previous ABI was unusable (SHM_REMAP would imply SHM_RDONLY and vice versa). Fortunately SHM_REMAP has very few consumers in the wild (I spotted openjdk for Linux, libfabric, MIPCH, and one other MPI thing in Debian code search) Reviewed by: kib Fixes: ea7e7006db10 Implement shmat(2) flag SHM_REMAP. Differential Revision: https://reviews.freebsd.org/D46825 --- sys/sys/shm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/sys/shm.h b/sys/sys/shm.h index d80de811ef7d..df32230dcdc7 100644 --- a/sys/sys/shm.h +++ b/sys/sys/shm.h @@ -51,7 +51,7 @@ #define SHM_RDONLY 010000 /* Attach read-only (else read-write) */ #define SHM_RND 020000 /* Round attach address to SHMLBA */ -#define SHM_REMAP 030000 /* Unmap before mapping */ +#define SHM_REMAP 040000 /* Unmap before mapping */ #define SHMLBA PAGE_SIZE /* Segment low boundary address multiple */ /* "official" access mode definitions; somewhat braindead since you have