diff options
Diffstat (limited to 'libpq/postgresql/port/linux/pg_config_os.h')
| -rw-r--r-- | libpq/postgresql/port/linux/pg_config_os.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/libpq/postgresql/port/linux/pg_config_os.h b/libpq/postgresql/port/linux/pg_config_os.h new file mode 100644 index 0000000..7a6e46c --- /dev/null +++ b/libpq/postgresql/port/linux/pg_config_os.h @@ -0,0 +1,22 @@ +/* src/include/port/linux.h */ + +/* + * As of July 2007, all known versions of the Linux kernel will sometimes + * return EIDRM for a shmctl() operation when EINVAL is correct (it happens + * when the low-order 15 bits of the supplied shm ID match the slot number + * assigned to a newer shmem segment). We deal with this by assuming that + * EIDRM means EINVAL in PGSharedMemoryIsInUse(). This is reasonably safe + * since in fact Linux has no excuse for ever returning EIDRM; it doesn't + * track removed segments in a way that would allow distinguishing them from + * private ones. But someday that code might get upgraded, and we'd have + * to have a kernel version test here. + */ +#define HAVE_LINUX_EIDRM_BUG + +/* + * Set the default wal_sync_method to fdatasync. With recent Linux versions, + * xlogdefs.h's normal rules will prefer open_datasync, which (a) doesn't + * perform better and (b) causes outright failures on ext4 data=journal + * filesystems, because those don't support O_DIRECT. + */ +#define PLATFORM_DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC |