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-rw-r--r--mysys/my_write.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/mysys/my_write.c b/mysys/my_write.c
new file mode 100644
index 00000000..06914b25
--- /dev/null
+++ b/mysys/my_write.c
@@ -0,0 +1,120 @@
+/* Copyright (c) 2000, 2016, Oracle and/or its affiliates.
+ Copyright (c) 2011, 2016, MariaDB
+
+ 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 <errno.h>
+
+
+ /* Write a chunk of bytes to a file */
+
+size_t my_write(File Filedes, const uchar *Buffer, size_t Count, myf MyFlags)
+{
+ size_t writtenbytes, written;
+ uint errors;
+ DBUG_ENTER("my_write");
+ DBUG_PRINT("my",("fd: %d Buffer: %p Count: %lu MyFlags: %lu",
+ Filedes, Buffer, (ulong) Count, MyFlags));
+ errors= 0; written= 0;
+ if (!(MyFlags & (MY_WME | MY_FAE | MY_FNABP)))
+ MyFlags|= my_global_flags;
+
+ /* The behavior of write(fd, buf, 0) is not portable */
+ if (unlikely(!Count))
+ DBUG_RETURN(0);
+
+ for (;;)
+ {
+#ifdef _WIN32
+ if(Filedes < 0)
+ {
+ my_errno= errno= EBADF;
+ DBUG_RETURN((size_t)-1);
+ }
+ writtenbytes= my_win_write(Filedes, Buffer, Count);
+#else
+ writtenbytes= write(Filedes, Buffer, Count);
+#endif
+
+ /**
+ To simulate the write error set the errno = error code
+ and the number pf written bytes to -1.
+ */
+ DBUG_EXECUTE_IF ("simulate_file_write_error",
+ if (!errors) {
+ errno= ENOSPC;
+ writtenbytes= (size_t) -1;
+ });
+
+ if (writtenbytes == Count)
+ break;
+ if (writtenbytes != (size_t) -1)
+ { /* Safeguard */
+ written+= writtenbytes;
+ Buffer+= writtenbytes;
+ Count-= writtenbytes;
+ }
+ my_errno= errno;
+ DBUG_PRINT("error",("Write only %ld bytes, error: %d",
+ (long) writtenbytes, my_errno));
+#ifndef NO_BACKGROUND
+ if (my_thread_var->abort)
+ MyFlags&= ~ MY_WAIT_IF_FULL; /* End if aborted by user */
+
+ if ((my_errno == ENOSPC || my_errno == EDQUOT) &&
+ (MyFlags & MY_WAIT_IF_FULL))
+ {
+ wait_for_free_space(my_filename(Filedes), errors);
+ errors++;
+ continue;
+ }
+
+ if ((writtenbytes == 0 || writtenbytes == (size_t) -1))
+ {
+ if (my_errno == EINTR)
+ {
+ DBUG_PRINT("debug", ("my_write() was interrupted and returned %ld",
+ (long) writtenbytes));
+ continue; /* Interrupted */
+ }
+
+ if (!writtenbytes && !errors++) /* Retry once */
+ {
+ /* We may come here if the file quota is exeeded */
+ errno= EFBIG; /* Assume this is the error */
+ continue;
+ }
+ }
+ else
+ continue; /* Retry */
+#endif
+
+ /* Don't give a warning if it's ok that we only write part of the data */
+ if (MyFlags & (MY_NABP | MY_FNABP))
+ {
+ if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
+ {
+ my_error(EE_WRITE, MYF(ME_BELL | (MyFlags & (ME_NOTE | ME_ERROR_LOG))),
+ my_filename(Filedes),my_errno);
+ }
+ DBUG_RETURN(MY_FILE_ERROR); /* Error on read */
+ }
+ break; /* Return bytes written */
+ }
+ if (MyFlags & (MY_NABP | MY_FNABP))
+ DBUG_RETURN(0); /* Want only errors */
+ DBUG_RETURN(writtenbytes+written);
+} /* my_write */