Permanent storage implementation

1 files changed, 64 insertions, 0 deletions

diff --git a/c_src/fsynchelper.c b/c_src/fsynchelper.c
new file mode 100644
index 0000000..e6a04be
--- /dev/null
+++ b/c_src/fsynchelper.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2014 Kungliga Tekniska Högskolan
+ * (KTH Royal Institute of Technology, Stockholm, Sweden).
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <sys/time.h>
+#include <sys/select.h>
+
+#include "erlport.h"
+
+static int
+dosync(int fd)
+{
+#ifdef F_FULLFSYNC
+    int ret = fcntl(fd, F_FULLFSYNC);
+#else
+    int ret = fsync(fd);
+#endif
+    return ret;
+}
+
+int
+main()
+{
+    char buf[100];
+    ssize_t len;
+
+    /* XXX: exits when command size is 0 */
+
+    while ((len = read_command(buf, sizeof(buf)-1)) > 0) {
+        buf[len] = '\0';
+        while (1) {
+            int fd;
+
+            fd = open(buf, O_RDONLY);
+            if (fd == -1) {
+                /* XXX: better errors */
+                write_status("openerror");
+                break;
+            }
+
+            if (dosync(fd) == 0) {
+                write_status("ok");
+            } else if (errno == EBADF) {
+                write_status("ebadf");
+            } else if (errno == EINTR) {
+                close(fd);
+                continue;
+            } else {
+                write_status("fsyncerror");
+            }
+
+            close(fd);
+            break;
+        }
+    }
+
+    return 0;
+}