New module attribute 'Applicability'.

[gnulib.git] / tests / test-pread.c

diff --git a/tests/test-pread.c b/tests/test-pread.c
index cf4179f..0ef387d 100644 (file)
--- a/tests/test-pread.c
+++ b/tests/test-pread.c
@@ -24,6 +24,7 @@
 #include <stdlib.h>
 #include <sys/types.h>
 #include <fcntl.h>
+#include <errno.h>
 
 #define ASSERT(expr) \
   do                                                                         \
@@ -64,15 +65,30 @@ main (void)
       ASSERT (init_pos == pos);
 
       for (i = 0; i < N; i++)
-       {
-         char byte_buf;
-         ASSERT (pread (fd, &byte_buf, 1, i) == 1);
-         ASSERT (byte_buf == buf[i]);
-         ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos);
-       }
+        {
+          char byte_buf;
+          ASSERT (pread (fd, &byte_buf, 1, i) == 1);
+          ASSERT (byte_buf == buf[i]);
+          ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos);
+        }
     }
 
+  {
+    /* Invalid offset must evoke failure with EINVAL.  */
+    char byte;
+    ASSERT (pread (fd, &byte, 1, (off_t) -1) == -1);
+    ASSERT (errno == EINVAL);
+  }
+
   ASSERT (close (fd) == 0);
 
+  {
+    char byte;
+    /* Trying to operate on a pipe must evoke failure with ESPIPE.
+       This assumes that stdin is a pipe, and hence not seekable.  */
+    ASSERT (pread (STDIN_FILENO, &byte, 1, 1) == -1);
+    ASSERT (errno == ESPIPE);
+  }
+
   return 0;
 }