Work around limit in writev in 2.6.38+ kernels

git-mirror · Jun 24, 2011 · d5495a1 · d5495a1
1 parent 0b1cbaa
commit d5495a1
Show file tree

Hide file tree

Showing 4 changed files with 17 additions and 3 deletions.
diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,10 @@
+2011-06-24  Ulrich Drepper  <drepper@gmail.com>
+
+	[BZ #12874]
+	* sysdeps/unix/sysv/linux/Makefile (CFLAGS-tst-writev.c): Define.
+	* sysdeps/wordsize-64/tst-writev.c: Work around problem with 2.6.38+
+	kernels which artificially limit size of requests.
+
 2011-06-22  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* sysdeps/i386/i686/multiarch/Makefile (sysdep_routines): Add

diff --git a/NEWS b/NEWS
@@ -9,7 +9,7 @@ Version 2.15
 
 * The following bugs are resolved with this release:
 
-  12885, 12907
+  12874, 12885, 12907
 
 * New program pldd to list loaded object of a process
   Implemented by Ulrich Drepper.

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
@@ -22,6 +22,7 @@ sysdep_routines += sysctl clone llseek umount umount2 readahead \
 		   eventfd eventfd_read eventfd_write prlimit
 
 CFLAGS-gethostid.c = -fexceptions
+CFLAGS-tst-writev.c += -DARTIFICIAL_LIMIT=0x7ffff000
 
 sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
 		  sys/klog.h sys/kdaemon.h \

diff --git a/sysdeps/wordsize-64/tst-writev.c b/sysdeps/wordsize-64/tst-writev.c
@@ -96,8 +96,14 @@ do_test (void)
 
   if (ret != (ssize_t) EXPECTED)
     {
-      printf ("writev() return value: %zd != EXPECTED: %zd\n", ret, EXPECTED);
-      return 1;
+#ifdef ARTIFICIAL_LIMIT
+      if (ret != (ssize_t) ARTIFICIAL_LIMIT)
+#endif
+	{
+	  printf ("writev() return value: %zd != EXPECTED: %zd\n",
+		  ret, EXPECTED);
+	  return 1;
+	}
     }
 
   return 0;