diff --git a/include/system/graphics.h b/include/system/graphics.h
index be86ae4..b33900b 100644
--- a/include/system/graphics.h
+++ b/include/system/graphics.h
@@ -297,6 +297,136 @@
     HAL_TRANSFORM_RESERVED  = 0x08,
 };
 
+/**
+ * Colorspace Definitions
+ * ======================
+ *
+ * Colorspace is the definition of how pixel values should be interpreted.
+ * It includes primaries (including white point) and the transfer
+ * characteristic function, which describes both gamma curve and numeric
+ * range (within the bit depth).
+ */
+
+enum {
+    /*
+     * Arbitrary colorspace with manually defined characteristics.
+     * Colorspace definition must be communicated separately.
+     *
+     * This is used when specifying primaries, transfer characteristics,
+     * etc. separately.
+     *
+     * A typical use case is in video encoding parameters (e.g. for H.264),
+     * where a colorspace can have separately defined primaries, transfer
+     * characteristics, etc.
+     */
+    HAL_COLORSPACE_ARBITRARY = 0x1,
+
+    /*
+     * YCbCr Colorspaces
+     * -----------------
+     *
+     * Primaries are given using (x,y) coordinates in the CIE 1931 definition
+     * of x and y specified by ISO 11664-1.
+     *
+     * Transfer characteristics are the opto-electronic transfer characteristic
+     * at the source as a function of linear optical intensity (luminance).
+     */
+
+    /*
+     * JPEG File Interchange Format (JFIF)
+     *
+     * Same model as BT.601-625, but all values (Y, Cb, Cr) range from 0 to 255
+     *
+     * Transfer characteristic curve:
+     *  E = 1.099 * L ^ 0.45 - 0.099, 1.00 >= L >= 0.018
+     *  E = 4.500 L, 0.018 > L >= 0
+     *      L - luminance of image 0 <= L <= 1 for conventional colorimetry
+     *      E - corresponding electrical signal
+     *
+     * Primaries:       x       y
+     *  green           0.290   0.600
+     *  blue            0.150   0.060
+     *  red             0.640   0.330
+     *  white (D65)     0.3127  0.3290
+     */
+    HAL_COLORSPACE_JFIF = 0x101,
+
+    /*
+     * ITU-R Recommendation 601 (BT.601) - 625-line
+     *
+     * Standard-definition television, 625 Lines (PAL)
+     *
+     * For 8-bit-depth formats:
+     * Luma (Y) samples should range from 16 to 235, inclusive
+     * Chroma (Cb, Cr) samples should range from 16 to 240, inclusive
+     *
+     * For 10-bit-depth formats:
+     * Luma (Y) samples should range from 64 to 940, inclusive
+     * Chroma (Cb, Cr) samples should range from 64 to 960, inclusive
+     *
+     * Transfer characteristic curve:
+     *  E = 1.099 * L ^ 0.45 - 0.099, 1.00 >= L >= 0.018
+     *  E = 4.500 L, 0.018 > L >= 0
+     *      L - luminance of image 0 <= L <= 1 for conventional colorimetry
+     *      E - corresponding electrical signal
+     *
+     * Primaries:       x       y
+     *  green           0.290   0.600
+     *  blue            0.150   0.060
+     *  red             0.640   0.330
+     *  white (D65)     0.3127  0.3290
+     */
+    HAL_COLORSPACE_BT601_625 = 0x102,
+
+    /*
+     * ITU-R Recommendation 601 (BT.601) - 525-line
+     *
+     * Standard-definition television, 525 Lines (NTSC)
+     *
+     * For 8-bit-depth formats:
+     * Luma (Y) samples should range from 16 to 235, inclusive
+     * Chroma (Cb, Cr) samples should range from 16 to 240, inclusive
+     *
+     * For 10-bit-depth formats:
+     * Luma (Y) samples should range from 64 to 940, inclusive
+     * Chroma (Cb, Cr) samples should range from 64 to 960, inclusive
+     *
+     * Transfer characteristic curve:
+     *  E = 1.099 * L ^ 0.45 - 0.099, 1.00 >= L >= 0.018
+     *  E = 4.500 L, 0.018 > L >= 0
+     *      L - luminance of image 0 <= L <= 1 for conventional colorimetry
+     *      E - corresponding electrical signal
+     *
+     * Primaries:       x       y
+     *  green           0.310   0.595
+     *  blue            0.155   0.070
+     *  red             0.630   0.340
+     *  white (D65)     0.3127  0.3290
+     */
+    HAL_COLORSPACE_BT601_525 = 0x103,
+
+    /*
+     * ITU-R Recommendation 709 (BT.709)
+     *
+     * High-definition television
+     *
+     * For 8-bit-depth formats:
+     * Luma (Y) samples should range from 16 to 235, inclusive
+     * Chroma (Cb, Cr) samples should range from 16 to 240, inclusive
+     *
+     * For 10-bit-depth formats:
+     * Luma (Y) samples should range from 64 to 940, inclusive
+     * Chroma (Cb, Cr) samples should range from 64 to 960, inclusive
+     *
+     * Primaries:       x       y
+     *  green           0.300   0.600
+     *  blue            0.150   0.060
+     *  red             0.640   0.330
+     *  white (D65)     0.3127  0.3290
+     */
+    HAL_COLORSPACE_BT709 = 0x104,
+};
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/init/property_service.c b/init/property_service.c
index fe7cbb5..56ae56f 100644
--- a/init/property_service.c
+++ b/init/property_service.c
@@ -24,6 +24,7 @@
 #include <dirent.h>
 #include <limits.h>
 #include <errno.h>
+#include <sys/poll.h>
 
 #include <cutils/misc.h>
 #include <cutils/sockets.h>
@@ -368,6 +369,9 @@
     socklen_t addr_size = sizeof(addr);
     socklen_t cr_size = sizeof(cr);
     char * source_ctx = NULL;
+    struct pollfd ufds[1];
+    const int timeout_ms = 2 * 1000;  /* Default 2 sec timeout for caller to send property. */
+    int nr;
 
     if ((s = accept(property_set_fd, (struct sockaddr *) &addr, &addr_size)) < 0) {
         return;
@@ -380,7 +384,21 @@
         return;
     }
 
-    r = TEMP_FAILURE_RETRY(recv(s, &msg, sizeof(msg), 0));
+    ufds[0].fd = s;
+    ufds[0].events = POLLIN;
+    ufds[0].revents = 0;
+    nr = TEMP_FAILURE_RETRY(poll(ufds, 1, timeout_ms));
+    if (nr == 0) {
+        ERROR("sys_prop: timeout waiting for uid=%d to send property message.\n", cr.uid);
+        close(s);
+        return;
+    } else if (nr < 0) {
+        ERROR("sys_prop: error waiting for uid=%d to send property message. err=%d %s\n", cr.uid, errno, strerror(errno));
+        close(s);
+        return;
+    }
+
+    r = TEMP_FAILURE_RETRY(recv(s, &msg, sizeof(msg), MSG_DONTWAIT));
     if(r != sizeof(prop_msg)) {
         ERROR("sys_prop: mis-match msg size received: %d expected: %zu errno: %d\n",
               r, sizeof(prop_msg), errno);
@@ -556,7 +574,8 @@
                     || (sb.st_gid != 0)
                     || (sb.st_nlink != 1)) {
                 ERROR("skipping insecure property file %s (uid=%u gid=%u nlink=%d mode=%o)\n",
-                      entry->d_name, sb.st_uid, sb.st_gid, sb.st_nlink, sb.st_mode);
+                      entry->d_name, (unsigned int)sb.st_uid, (unsigned int)sb.st_gid,
+                      sb.st_nlink, sb.st_mode);
                 close(fd);
                 continue;
             }