.

lib/safe-read.c

@@ -0,0 +1,31 @@
+/* Read LEN bytes at PTR from descriptor DESC, retrying if necessary.
+   Return the actual number of bytes read, zero for EOF, or negative
+   for an error.  */
+
+int
+safe_read (desc, ptr, len)
+     int desc;
+     char *ptr;
+     int len;
+{
+  int n_remaining;
+
+  n_remaining = len;
+  while (n_remaining > 0)
+    {
+      int n_chars = read (desc, ptr, n_remaining);
+      if (n_chars < 0)
+	{
+#ifdef EINTR
+	  if (errno == EINTR)
+	    continue;
+#endif
+	  return n_chars;
+	}
+      if (n_chars == 0)
+	break;
+      ptr += n_chars;
+      n_remaining -= n_chars;
+    }
+  return len - n_remaining;
+}