latest sources commit

deps/mysqllite/mysys/my_delete.c

@@ -0,0 +1,125 @@
+/* Copyright (C) 2000 MySQL AB
+
+   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include "mysys_priv.h"
+#include "mysys_err.h"
+#include <my_sys.h>
+
+int my_delete(const char *name, myf MyFlags)
+{
+  int err;
+  DBUG_ENTER("my_delete");
+  DBUG_PRINT("my",("name %s MyFlags %d", name, MyFlags));
+
+  if ((err = unlink(name)) == -1)
+  {
+    my_errno=errno;
+    if (MyFlags & (MY_FAE+MY_WME))
+      my_error(EE_DELETE,MYF(ME_BELL+ME_WAITTANG+(MyFlags & ME_NOINPUT)),
+	       name,errno);
+  }
+  else if ((MyFlags & MY_SYNC_DIR) &&
+           my_sync_dir_by_file(name, MyFlags))
+    err= -1;
+  DBUG_RETURN(err);
+} /* my_delete */
+
+#if defined(__WIN__)
+/**
+  Delete file which is possibly not closed.
+
+  This function is intended to be used exclusively as a temporal solution
+  for Win NT in case when it is needed to delete a not closed file (note
+  that the file must be opened everywhere with FILE_SHARE_DELETE mode).
+  Deleting not-closed files can not be supported on Win 98|ME (and because
+  of that is considered harmful).
+  
+  The function deletes the file with its preliminary renaming. This is
+  because when not-closed share-delete file is deleted it still lives on
+  a disk until it will not be closed everwhere. This may conflict with an
+  attempt to create a new file with the same name. The deleted file is
+  renamed to <name>.<num>.deleted where <name> - the initial name of the
+  file, <num> - a hexadecimal number chosen to make the temporal name to
+  be unique.
+
+  @param the name of the being deleted file
+  @param the flags instructing how to react on an error internally in
+         the function
+
+  @note The per-thread @c my_errno holds additional info for a caller to
+        decide how critical the error can be.
+
+  @retval
+    0	ok
+  @retval
+    1   error
+
+
+*/
+int nt_share_delete(const char *name, myf MyFlags)
+{
+  char buf[MAX_PATH + 20];
+  ulong cnt;
+  DBUG_ENTER("nt_share_delete");
+  DBUG_PRINT("my",("name %s MyFlags %d", name, MyFlags));
+
+  for (cnt= GetTickCount(); cnt; cnt--)
+  {
+    errno= 0;
+    sprintf(buf, "%s.%08X.deleted", name, cnt);
+    if (MoveFile(name, buf))
+      break;
+
+    if ((errno= GetLastError()) == ERROR_ALREADY_EXISTS)
+      continue;
+
+    /* This happened during tests with MERGE tables. */
+    if (errno == ERROR_ACCESS_DENIED)
+      continue;
+
+    DBUG_PRINT("warning", ("Failed to rename %s to %s, errno: %d",
+                           name, buf, errno));
+    break;
+  }
+
+  if (errno == ERROR_FILE_NOT_FOUND)
+  {
+    my_errno= ENOENT;    // marking, that `name' doesn't exist 
+  }
+  else if (errno == 0)
+  {
+    if (DeleteFile(buf))
+      DBUG_RETURN(0);
+    /*
+      The below is more complicated than necessary. For some reason, the
+      assignment to my_errno clears the error number, which is retrieved
+      by GetLastError() (VC2005EE). Assigning to errno first, allows to
+      retrieve the correct value.
+    */
+    errno= GetLastError();
+    if (errno == 0)
+      my_errno= ENOENT; // marking, that `buf' doesn't exist
+    else
+      my_errno= errno;
+  }
+  else
+    my_errno= errno;
+
+  if (MyFlags & (MY_FAE+MY_WME))
+    my_error(EE_DELETE, MYF(ME_BELL + ME_WAITTANG + (MyFlags & ME_NOINPUT)),
+             name, my_errno);
+  DBUG_RETURN(-1);
+}
+#endif