From 57e8823548ad6e65d33b2153edeb18fb0edc20e6 Mon Sep 17 00:00:00 2001
From: Austin Foxley <austinf@cetoncorp.com>
Date: Sat, 17 Oct 2009 14:32:36 -0700
Subject: cancellation support for a large amount of the required syscalls

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
---
 libc/sysdeps/linux/common/readv.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

(limited to 'libc/sysdeps/linux/common/readv.c')

diff --git a/libc/sysdeps/linux/common/readv.c b/libc/sysdeps/linux/common/readv.c
index 3c40a0d8d..fce396d5f 100644
--- a/libc/sysdeps/linux/common/readv.c
+++ b/libc/sysdeps/linux/common/readv.c
@@ -2,7 +2,8 @@
 /*
  * readv() for uClibc
  *
- * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ * Copyright (C) 2006 by Steven J. Hill <sjhill@realitydiluted.com>
+ * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
  *
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
@@ -10,5 +11,40 @@
 #include <sys/syscall.h>
 #include <sys/uio.h>
 
+#ifdef __UCLIBC_HAS_THREADS_NATIVE__
+#include <sysdep-cancel.h>
+
+/* We should deal with kernel which have a smaller UIO_FASTIOV as well
+   as a very big count.  */
+static ssize_t __readv (int fd, const struct iovec *vector, int count)
+{
+  ssize_t bytes_read;
+
+  bytes_read = INLINE_SYSCALL (readv, 3, fd, vector, count);
+
+  if (bytes_read >= 0 || errno != EINVAL || count <= UIO_FASTIOV)
+    return bytes_read;
+
+  /* glibc tries again, but we do not. */
+  //return __atomic_readv_replacement (fd, vector, count);
+
+  return -1;
+}
+
+ssize_t readv (int fd, const struct iovec *vector, int count)
+{
+  if (SINGLE_THREAD_P)
+    return __readv (fd, vector, count);
+
+  int oldtype = LIBC_CANCEL_ASYNC ();
+
+  int result = __readv (fd, vector, count);
+
+  LIBC_CANCEL_RESET (oldtype);
+
+  return result;
+}
+#else
 _syscall3(ssize_t, readv, int, filedes, const struct iovec *, vector,
 		  int, count)
+#endif
-- 
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