Merge branch 'ps/reftable-portability'

Update reftable library part with what is used in libgit2 to improve
portability to different target codebases and platforms.

* ps/reftable-portability:
  reftable/system: add abstraction to mmap files
  reftable/system: add abstraction to retrieve time in milliseconds
  reftable/fsck: use REFTABLE_UNUSED instead of UNUSED
  reftable/stack: provide fsync(3p) via system header
  reftable: introduce "reftable-system.h" header

1 files changed, 32 insertions, 0 deletions

diff --git a/reftable/system.c b/reftable/system.c
index 725a25844e..9063641f30 100644
--- a/reftable/system.c
+++ b/reftable/system.c
@@ -4,7 +4,9 @@
 #include "basics.h"
 #include "reftable-error.h"
 #include "../lockfile.h"
+#include "../trace.h"
 #include "../tempfile.h"
+#include "../write-or-die.h"
 
 uint32_t reftable_rand(void)
 {
@@ -131,3 +133,33 @@ int flock_commit(struct reftable_flock *l)
 
 	return 0;
 }
+
+int reftable_fsync(int fd)
+{
+	return fsync_component(FSYNC_COMPONENT_REFERENCE, fd);
+}
+
+uint64_t reftable_time_ms(void)
+{
+	return getnanotime() / 1000000;
+}
+
+int reftable_mmap(struct reftable_mmap *out, int fd, size_t len)
+{
+	void *data = xmmap_gently(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (data == MAP_FAILED)
+		return REFTABLE_IO_ERROR;
+
+	out->data = data;
+	out->size = len;
+
+	return 0;
+}
+
+int reftable_munmap(struct reftable_mmap *mmap)
+{
+	if (munmap(mmap->data, mmap->size) < 0)
+		return REFTABLE_IO_ERROR;
+	memset(mmap, 0, sizeof(*mmap));
+	return 0;
+}