From: Dmitry V. Levin <ldv@altlinux.org>
Date: Wed, 18 May 2016 09:21:54 +0000 (+0000)
Subject: tests/pread64-pwrite64.c: robustify against os specific issues
X-Git-Tag: v4.12~115
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ff2b853e7fce27621ef01aacfbccab62f489bf16;p=strace

tests/pread64-pwrite64.c: robustify against os specific issues

Do not assume that pwrite64 syscall fails when only part of the
specified memory buffer is accessible.  With some kernels, one
accessible byte at the end of page is enough for pwrite64 syscall
to return 1.

* tests/pread64-pwrite64.c (main): Tweak the test that can lead
to a partial write.
---

diff --git a/tests/pread64-pwrite64.c b/tests/pread64-pwrite64.c
index b1d45de3..4a0932a9 100644
--- a/tests/pread64-pwrite64.c
+++ b/tests/pread64-pwrite64.c
@@ -156,12 +156,11 @@ main(void)
 		perror_msg_and_fail("pwrite64: expected 0, returned %ld", rc);
 	tprintf("pwrite64(1, \"\", 0, 0) = 0\n");
 
-	rc = pwrite(1, w, w_len + 1, 0);
+	rc = pwrite(1, efault, 1, 0);
 	if (rc != -1)
 		perror_msg_and_fail("pwrite64: expected -1 EFAULT"
 				    ", returned %ld", rc);
-	tprintf("pwrite64(1, %p, %u, 0) = -1 EFAULT (%m)\n",
-		w, w_len + 1);
+	tprintf("pwrite64(1, %p, 1, 0) = -1 EFAULT (%m)\n", efault);
 
 	rc = pwrite(1, nil, 1, -3);
 	if (rc != -1)