codekingpro/portable-devtools

1/* src/include/port/linux.h */2 3/*4 * As of July 2007, all known versions of the Linux kernel will sometimes5 * return EIDRM for a shmctl() operation when EINVAL is correct (it happens6 * when the low-order 15 bits of the supplied shm ID match the slot number7 * assigned to a newer shmem segment).  We deal with this by assuming that8 * EIDRM means EINVAL in PGSharedMemoryIsInUse().  This is reasonably safe9 * since in fact Linux has no excuse for ever returning EIDRM; it doesn't10 * track removed segments in a way that would allow distinguishing them from11 * private ones.  But someday that code might get upgraded, and we'd have12 * to have a kernel version test here.13 */14#define HAVE_LINUX_EIDRM_BUG15 16/*17 * Set the default wal_sync_method to fdatasync.  With recent Linux versions,18 * xlogdefs.h's normal rules will prefer open_datasync, which (a) doesn't19 * perform better and (b) causes outright failures on ext4 data=journal20 * filesystems, because those don't support O_DIRECT.21 */22#define PLATFORM_DEFAULT_SYNC_METHOD	SYNC_METHOD_FDATASYNC23