diff options
Diffstat (limited to 'mysys/my_open.c')
| -rw-r--r-- | mysys/my_open.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/mysys/my_open.c b/mysys/my_open.c new file mode 100644 index 00000000..4d26a7b2 --- /dev/null +++ b/mysys/my_open.c @@ -0,0 +1,158 @@ +/* Copyright (c) 2000, 2011, 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 <m_string.h> +#include <errno.h> +#include "my_atomic.h" + +CREATE_NOSYMLINK_FUNCTION( + open_nosymlinks(const char *pathname, int flags, int mode), + openat(dfd, filename, O_NOFOLLOW | flags, mode), + open(pathname, O_NOFOLLOW | flags, mode) +); + +/* + 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: %lu", + FileName, Flags, MyFlags)); + if (!(MyFlags & (MY_WME | MY_FAE | MY_FFNF))) + MyFlags|= my_global_flags; +#if defined(_WIN32) + fd= my_win_open(FileName, Flags); +#else + if (MyFlags & MY_NOSYMLINKS) + fd = open_nosymlinks(FileName, Flags | O_CLOEXEC, my_umask); + else + fd = open(FileName, Flags | O_CLOEXEC, my_umask); +#endif + + fd= my_register_filename(fd, FileName, FILE_BY_OPEN, + EE_FILENOTFOUND, MyFlags); + DBUG_RETURN(fd); +} /* my_open */ + + +/* + Close a file + + SYNOPSIS + my_close() + fd File sescriptor + myf Special Flags + +*/ + +int my_close(File fd, myf MyFlags) +{ + int err; + char *name= NULL; + DBUG_ENTER("my_close"); + DBUG_PRINT("my",("fd: %d MyFlags: %lu",fd, MyFlags)); + if (!(MyFlags & (MY_WME | MY_FAE))) + MyFlags|= my_global_flags; + + if ((uint) fd < my_file_limit && my_file_info[fd].type != UNOPEN) + { + name= my_file_info[fd].name; + my_file_info[fd].name= NULL; + my_file_info[fd].type= UNOPEN; + } +#ifndef _WIN32 + err= close(fd); +#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 | (MyFlags & (ME_NOTE | ME_ERROR_LOG))), + name,errno); + } + if (name) + { + my_free(name); + } + my_atomic_add32_explicit(&my_file_opened, -1, MY_MEMORY_ORDER_RELAXED); + 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) + { + my_atomic_add32_explicit(&my_file_opened, 1, MY_MEMORY_ORDER_RELAXED); + if ((uint) fd >= my_file_limit || (MyFlags & MY_NO_REGISTER)) + DBUG_RETURN(fd); + my_file_info[fd].name = my_strdup(key_memory_my_file_info, FileName, MyFlags); + statistic_increment(my_file_total_opened,&THR_LOCK_open); + my_file_info[fd].type = type_of_file; + DBUG_PRINT("exit",("fd: %d",fd)); + DBUG_RETURN(fd); + } + 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; + my_error(error_message_number, + MYF(ME_BELL | (MyFlags & (ME_NOTE | ME_ERROR_LOG))), + FileName, my_errno); + } + DBUG_RETURN(-1); +} |