Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 112 insertions, 0 deletions

diff --git a/mysys/my_read.c b/mysys/my_read.c
new file mode 100644
index 00000000..6b4f17e9
--- /dev/null
+++ b/mysys/my_read.c
@@ -0,0 +1,112 @@
+/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#include "mysys_priv.h"
+#include "mysys_err.h"
+#include <my_base.h>
+#include <errno.h>
+
+/*
+  Read a chunk of bytes from a file with retry's if needed
+
+  The parameters are:
+    File descriptor
+    Buffer to hold at least Count bytes
+    Bytes to read
+    Flags on what to do on error
+
+    Return:
+      -1 on error
+      0  if flag has bits MY_NABP or MY_FNABP set
+      N  number of bytes read.
+*/
+
+size_t my_read(File Filedes, uchar *Buffer, size_t Count, myf MyFlags)
+{
+  size_t readbytes, save_count= 0;
+  DBUG_ENTER("my_read");
+  DBUG_PRINT("my",("fd: %d  Buffer: %p  Count: %lu  MyFlags: %lu",
+                   Filedes, Buffer, (ulong) Count, MyFlags));
+  if (!(MyFlags & (MY_WME | MY_FAE | MY_FNABP)))
+    MyFlags|= my_global_flags;
+
+  for (;;)
+  {
+    errno= 0;					/* Linux, Windows don't reset this on EOF/success */
+#ifdef _WIN32
+    readbytes= my_win_read(Filedes, Buffer, Count);
+#else
+    readbytes= read(Filedes, Buffer, Count);
+#endif
+    DBUG_EXECUTE_IF ("simulate_file_read_error",
+                     {
+                       errno= ENOSPC;
+                       readbytes= (size_t) -1;
+                       DBUG_SET("-d,simulate_file_read_error");
+                       DBUG_SET("-d,simulate_my_b_fill_error");
+                     });
+
+    if (readbytes != Count)
+    {
+      int got_errno= my_errno= errno;
+      DBUG_PRINT("warning",("Read only %d bytes off %lu from %d, errno: %d",
+                            (int) readbytes, (ulong) Count, Filedes,
+                            got_errno));
+
+      if (got_errno == 0 || (readbytes != (size_t) -1 &&
+                         (MyFlags & (MY_NABP | MY_FNABP))))
+        my_errno= HA_ERR_FILE_TOO_SHORT;
+
+      if ((readbytes == 0 || (int) readbytes == -1) && got_errno == EINTR)
+      {  
+        DBUG_PRINT("debug", ("my_read() was interrupted and returned %ld",
+                             (long) readbytes));
+        continue;                              /* Interrupted */
+      }
+
+      /* Do a read retry if we didn't get enough data on first read */
+      if (readbytes != (size_t) -1 && readbytes != 0 &&
+          (MyFlags & MY_FULL_IO))
+      {
+        Buffer+= readbytes;
+        Count-= readbytes;
+        save_count+= readbytes;
+        continue;
+      }
+
+      if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
+      {
+        if (readbytes == (size_t) -1)
+          my_error(EE_READ,
+                   MYF(ME_BELL | (MyFlags & (ME_NOTE | ME_ERROR_LOG))),
+                   my_filename(Filedes), got_errno);
+        else if (MyFlags & (MY_NABP | MY_FNABP))
+          my_error(EE_EOFERR,
+                   MYF(ME_BELL | (MyFlags & (ME_NOTE | ME_ERROR_LOG))),
+                   my_filename(Filedes), got_errno);
+      }
+      if (readbytes == (size_t) -1 ||
+          ((MyFlags & (MY_FNABP | MY_NABP)) && !(MyFlags & MY_FULL_IO)))
+        DBUG_RETURN(MY_FILE_ERROR);	/* Return with error */
+    }
+
+    if (MyFlags & (MY_NABP | MY_FNABP))
+      readbytes= 0;			/* Ok on read */
+    else
+      readbytes+= save_count;
+    break;
+  }
+  DBUG_RETURN(readbytes);
+} /* my_read */