latest sources commit

deps/mysqllite/mysys/my_open.c

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+/* Copyright (C) 2000 MySQL AB, 2008-2009 Sun Microsystems, Inc
+
+   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_dir.h>
+#include <errno.h>
+
+
+/*
+  Open a file
+
+  SYNOPSIS
+    my_open()
+      FileName	Fully qualified file name
+      Flags	Read | write 
+      MyFlags	Special flags
+
+  RETURN VALUE
+    File descriptor
+*/
+
+File my_open(const char *FileName, int Flags, myf MyFlags)
+				/* Path-name of file */
+				/* Read | write .. */
+				/* Special flags */
+{
+  File fd;
+  DBUG_ENTER("my_open");
+  DBUG_PRINT("my",("Name: '%s'  Flags: %d  MyFlags: %d",
+		   FileName, Flags, MyFlags));
+#if defined(_WIN32)
+  fd= my_win_open(FileName, Flags);
+#elif !defined(NO_OPEN_3)
+  fd = open(FileName, Flags, my_umask);	/* Normal unix */
+#else
+  fd = open((char *) FileName, Flags);
+#endif
+
+  DBUG_RETURN(my_register_filename(fd, FileName, FILE_BY_OPEN,
+				   EE_FILENOTFOUND, MyFlags));
+} /* my_open */
+
+
+/*
+  Close a file
+
+  SYNOPSIS
+    my_close()
+      fd	File sescriptor
+      myf	Special Flags
+
+*/
+
+int my_close(File fd, myf MyFlags)
+{
+  int err;
+  DBUG_ENTER("my_close");
+  DBUG_PRINT("my",("fd: %d  MyFlags: %d",fd, MyFlags));
+
+  mysql_mutex_lock(&THR_LOCK_open);
+#ifndef _WIN32
+  do
+  {
+    err= close(fd);
+  } while (err == -1 && errno == EINTR);
+#else
+  err= my_win_close(fd);
+#endif
+  if (err)
+  {
+    DBUG_PRINT("error",("Got error %d on close",err));
+    my_errno=errno;
+    if (MyFlags & (MY_FAE | MY_WME))
+      my_error(EE_BADCLOSE, MYF(ME_BELL+ME_WAITTANG),my_filename(fd),errno);
+  }
+  if ((uint) fd < my_file_limit && my_file_info[fd].type != UNOPEN)
+  {
+    my_free(my_file_info[fd].name);
+#if !defined(HAVE_PREAD) && !defined(_WIN32)
+    mysql_mutex_destroy(&my_file_info[fd].mutex);
+#endif
+    my_file_info[fd].type = UNOPEN;
+  }
+  my_file_opened--;
+  mysql_mutex_unlock(&THR_LOCK_open);
+  DBUG_RETURN(err);
+} /* my_close */
+
+
+/*
+  Register file in my_file_info[]
+   
+  SYNOPSIS
+    my_register_filename()
+    fd			   File number opened, -1 if error on open
+    FileName		   File name
+    type_file_type	   How file was created
+    error_message_number   Error message number if caller got error (fd == -1)
+    MyFlags		   Flags for my_close()
+
+  RETURN
+    -1   error
+     #   Filenumber
+
+*/
+
+File my_register_filename(File fd, const char *FileName, enum file_type
+			  type_of_file, uint error_message_number, myf MyFlags)
+{
+  DBUG_ENTER("my_register_filename");
+  if ((int) fd >= MY_FILE_MIN)
+  {
+    if ((uint) fd >= my_file_limit)
+    {
+#if !defined(HAVE_PREAD) 
+      my_errno= EMFILE;
+#else
+      thread_safe_increment(my_file_opened,&THR_LOCK_open);
+      DBUG_RETURN(fd);				/* safeguard */
+#endif
+    }
+    else
+    {
+      mysql_mutex_lock(&THR_LOCK_open);
+      if ((my_file_info[fd].name = (char*) my_strdup(FileName,MyFlags)))
+      {
+        my_file_opened++;
+        my_file_total_opened++;
+        my_file_info[fd].type = type_of_file;
+#if !defined(HAVE_PREAD) && !defined(_WIN32)
+        mysql_mutex_init(key_my_file_info_mutex, &my_file_info[fd].mutex,
+                         MY_MUTEX_INIT_FAST);
+#endif
+        mysql_mutex_unlock(&THR_LOCK_open);
+        DBUG_PRINT("exit",("fd: %d",fd));
+        DBUG_RETURN(fd);
+      }
+      mysql_mutex_unlock(&THR_LOCK_open);
+      my_errno= ENOMEM;
+    }
+    (void) my_close(fd, MyFlags);
+  }
+  else
+    my_errno= errno;
+
+  DBUG_PRINT("error",("Got error %d on open", my_errno));
+  if (MyFlags & (MY_FFNF | MY_FAE | MY_WME))
+  {
+    if (my_errno == EMFILE)
+      error_message_number= EE_OUT_OF_FILERESOURCES;
+    DBUG_PRINT("error",("print err: %d",error_message_number));
+    my_error(error_message_number, MYF(ME_BELL+ME_WAITTANG),
+             FileName, my_errno);
+  }
+  DBUG_RETURN(-1);
+}
+
+
+
+
+#ifdef EXTRA_DEBUG
+
+void my_print_open_files(void)
+{
+  if (my_file_opened | my_stream_opened)
+  {
+    uint i;
+    for (i= 0 ; i < my_file_limit ; i++)
+    {
+      if (my_file_info[i].type != UNOPEN)
+      {
+        fprintf(stderr, EE(EE_FILE_NOT_CLOSED), my_file_info[i].name, i);
+        fputc('\n', stderr);
+      }
+    }
+  }
+}
+
+#endif