am 51ccef27: Merge "Add TEMP_FAILURE_RETRY macro for darwin"

* commit '51ccef27cab58277775e62518a59666d2a059b62':
  Add TEMP_FAILURE_RETRY macro for darwin

adb/sysdeps.h

@@ -277,6 +277,21 @@ extern char*  adb_strtok_r(char *str, const char *delim, char **saveptr);
 #include <string.h>
 #include <unistd.h>
 
+/*
+ * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
+ * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
+ * not already defined, then define it here.
+ */
+#ifndef TEMP_FAILURE_RETRY
+/* Used to retry syscalls that can return EINTR. */
+#define TEMP_FAILURE_RETRY(exp) ({         \
+    typeof (exp) _rc;                      \
+    do {                                   \
+        _rc = (exp);                       \
+    } while (_rc == -1 && errno == EINTR); \
+    _rc; })
+#endif
+
 #define OS_PATH_SEPARATOR '/'
 #define OS_PATH_SEPARATOR_STR "/"
 #define ENV_PATH_SEPARATOR_STR ":"