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/* 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; either version 2 of the License, or
(at your option) any later version.
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 */
#define USES_TYPES
#include "mysys_priv.h"
#include "mysys_err.h"
#include <my_dir.h>
#include <errno.h>
#if defined(MSDOS) || defined(__WIN__) || defined(__EMX__) || defined(OS2)
#include <share.h>
#endif
/*
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(MSDOS) || defined(__WIN__) || defined(__EMX__) || defined(OS2)
/*
Check that we don't try to open or create a file name that may
cause problems for us in the future (like PRN)
*/
if (check_if_legal_filename(FileName))
{
errno= EACCES;
DBUG_RETURN(my_register_filename(-1, FileName, FILE_BY_OPEN,
EE_FILENOTFOUND, MyFlags));
}
if (Flags & O_SHARE)
fd = sopen((my_string) FileName, (Flags & ~O_SHARE) | O_BINARY, SH_DENYNO,
MY_S_IREAD | MY_S_IWRITE);
else
fd = open((my_string) FileName, Flags | O_BINARY,
MY_S_IREAD | MY_S_IWRITE);
#elif !defined(NO_OPEN_3)
fd = open(FileName, Flags, my_umask); /* Normal unix */
#else
fd = open((my_string) 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));
pthread_mutex_lock(&THR_LOCK_open);
do
{
err= close(fd);
} while (err == -1 && errno == EINTR);
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, MYF(0));
#if defined(THREAD) && !defined(HAVE_PREAD)
pthread_mutex_destroy(&my_file_info[fd].mutex);
#endif
my_file_info[fd].type = UNOPEN;
}
my_file_opened--;
pthread_mutex_unlock(&THR_LOCK_open);
DBUG_RETURN(err);
} /* my_close */
/*
Register file in my_file_info[]
SYNOPSIS
my_register_filename()
fd
FileName
type_file_type
*/
File my_register_filename(File fd, const char *FileName, enum file_type
type_of_file, uint error_message_number, myf MyFlags)
{
if ((int) fd >= 0)
{
if ((uint) fd >= my_file_limit)
{
#if defined(THREAD) && !defined(HAVE_PREAD)
(void) my_close(fd,MyFlags);
my_errno=EMFILE;
if (MyFlags & (MY_FFNF | MY_FAE | MY_WME))
my_error(EE_OUT_OF_FILERESOURCES, MYF(ME_BELL+ME_WAITTANG),
FileName, my_errno);
return(-1);
#endif
thread_safe_increment(my_file_opened,&THR_LOCK_open);
return(fd); /* safeguard */
}
pthread_mutex_lock(&THR_LOCK_open);
if ((my_file_info[fd].name = (char*) my_strdup(FileName,MyFlags)))
{
my_file_opened++;
my_file_info[fd].type = type_of_file;
#if defined(THREAD) && !defined(HAVE_PREAD)
pthread_mutex_init(&my_file_info[fd].mutex,MY_MUTEX_INIT_FAST);
#endif
pthread_mutex_unlock(&THR_LOCK_open);
DBUG_PRINT("exit",("fd: %d",fd));
return(fd);
}
pthread_mutex_unlock(&THR_LOCK_open);
(void) my_close(fd, MyFlags);
my_errno=ENOMEM;
}
else
my_errno=errno;
DBUG_PRINT("error",("Got error %d on open",my_errno));
if (MyFlags & (MY_FFNF | MY_FAE | MY_WME))
my_error(error_message_number, MYF(ME_BELL+ME_WAITTANG),
FileName, my_errno);
return(fd);
}
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