From 1baf5e2a66516cbc706eeb23f2451862a7ab0f89 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Wed, 25 Nov 2009 18:26:35 +0100
Subject: [PATCH] test-pread: cover failure with ESPIPE and EINVAL

* tests/test-pread.c (main): Test for failure, too.
* tests/test-pread.sh: Invoke with stdin on a pipe.
Suggested by Eric Blake.
---
 ChangeLog           |  5 +++++
 tests/test-pread.c  | 16 ++++++++++++++++
 tests/test-pread.sh |  2 +-
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 2e5f9fbe61..2ec9906c43 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2009-11-25  Jim Meyering  <meyering@redhat.com>
 
+	test-pread: cover failure with ESPIPE and EINVAL
+	* tests/test-pread.c (main): Test for failure, too.
+	* tests/test-pread.sh: Invoke with stdin on a pipe.
+	Suggested by Eric Blake.
+
 	pread: improvement and fix
 	* modules/pread (Depends-on): Depend on lseek, for portability to
 	e.g., mingw.  Suggested by Eric Blake.
diff --git a/tests/test-pread.c b/tests/test-pread.c
index cf4179f32f..fd5db8e8a1 100644
--- 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                                                                         \
@@ -72,7 +73,22 @@ main (void)
 	}
     }
 
+  {
+    /* 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;
 }
diff --git a/tests/test-pread.sh b/tests/test-pread.sh
index 98971a4c58..5ab88eb6ff 100755
--- a/tests/test-pread.sh
+++ b/tests/test-pread.sh
@@ -3,6 +3,6 @@
 . $srcdir/init.sh --set-path=.
 
 fail=0;
-test-pread || fail=1
+echo abc | test-pread || fail=1
 
 Exit $fail
-- 
2.30.2