gold/

* testsuite/binary_unittest.cc (read_all): New function.
	(Sized_binary_test): Use it instead of ::read.
	* fileread.cc (do_read): Don't assume pread always reads the whole
	amount in a single call.

gold/testsuite/binary_unittest.cc

@@ -38,6 +38,29 @@
 #include "test.h"
 #include "testfile.h"
 
+namespace
+{
+
+ssize_t
+read_all (int fd, unsigned char* buf, ssize_t size)
+{
+  ssize_t total_read = 0;
+  while (size > 0)
+    {
+      ssize_t nread = ::read(fd, buf, size);
+      if (nread < 0)
+	return nread;
+      if (nread == 0)
+	break;
+      buf += nread;
+      size -= nread;
+      total_read += nread;
+    }
+  return total_read;
+}
+
+} // End anonymous namespace.
+
 namespace gold_testsuite
 {
 
@@ -57,7 +80,7 @@ Sized_binary_test()
   int o = open_descriptor(-1, gold::program_name, O_RDONLY);
   CHECK(o >= 0);
   unsigned char* filedata = new unsigned char[st.st_size];
-  CHECK(::read(o, filedata, st.st_size) == st.st_size);
+  CHECK(read_all(o, filedata, st.st_size) == static_cast<ssize_t>(st.st_size));
   CHECK(::close(o) == 0);
 
   Binary_to_elf binary(static_cast<elfcpp::EM>(0xffff), size, big_endian,