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mikx
358
deps/mysqllite/mysys/my_fopen.c
vendored
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358
deps/mysqllite/mysys/my_fopen.c
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/* Copyright (C) 2000 MySQL AB, 2008-2009 Sun Microsystems, Inc
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "mysys_priv.h"
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#include "my_static.h"
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#include <errno.h>
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#include "mysys_err.h"
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#if defined(__FreeBSD__)
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extern int getosreldate(void);
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#endif
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static void make_ftype(char * to,int flag);
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/*
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Open a file as stream
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SYNOPSIS
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my_fopen()
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FileName Path-name of file
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Flags Read | write | append | trunc (like for open())
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MyFlags Flags for handling errors
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RETURN
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0 Error
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# File handler
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*/
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FILE *my_fopen(const char *filename, int flags, myf MyFlags)
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{
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FILE *fd;
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char type[5];
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DBUG_ENTER("my_fopen");
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DBUG_PRINT("my",("Name: '%s' flags: %d MyFlags: %d",
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filename, flags, MyFlags));
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make_ftype(type,flags);
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#ifdef _WIN32
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fd= my_win_fopen(filename, type);
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#else
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fd= fopen(filename, type);
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#endif
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if (fd != 0)
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{
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/*
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The test works if MY_NFILE < 128. The problem is that fileno() is char
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on some OS (SUNOS). Actually the filename save isn't that important
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so we can ignore if this doesn't work.
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*/
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int filedesc= my_fileno(fd);
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if ((uint)filedesc >= my_file_limit)
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{
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thread_safe_increment(my_stream_opened,&THR_LOCK_open);
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DBUG_RETURN(fd); /* safeguard */
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}
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mysql_mutex_lock(&THR_LOCK_open);
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if ((my_file_info[filedesc].name= (char*)
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my_strdup(filename,MyFlags)))
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{
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my_stream_opened++;
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my_file_total_opened++;
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my_file_info[filedesc].type= STREAM_BY_FOPEN;
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mysql_mutex_unlock(&THR_LOCK_open);
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DBUG_PRINT("exit",("stream: 0x%lx", (long) fd));
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DBUG_RETURN(fd);
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}
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mysql_mutex_unlock(&THR_LOCK_open);
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(void) my_fclose(fd,MyFlags);
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my_errno=ENOMEM;
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}
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else
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my_errno=errno;
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DBUG_PRINT("error",("Got error %d on open",my_errno));
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if (MyFlags & (MY_FFNF | MY_FAE | MY_WME))
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my_error((flags & O_RDONLY) || (flags == O_RDONLY ) ? EE_FILENOTFOUND :
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EE_CANTCREATEFILE,
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MYF(ME_BELL+ME_WAITTANG), filename, my_errno);
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DBUG_RETURN((FILE*) 0);
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} /* my_fopen */
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#if defined(_WIN32)
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static FILE *my_win_freopen(const char *path, const char *mode, FILE *stream)
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{
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int handle_fd, fd= _fileno(stream);
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HANDLE osfh;
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DBUG_ASSERT(path && stream);
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/* Services don't have stdout/stderr on Windows, so _fileno returns -1. */
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if (fd < 0)
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{
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if (!freopen(path, mode, stream))
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return NULL;
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fd= _fileno(stream);
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}
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if ((osfh= CreateFile(path, GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE |
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FILE_SHARE_DELETE, NULL,
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OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL,
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NULL)) == INVALID_HANDLE_VALUE)
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return NULL;
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if ((handle_fd= _open_osfhandle((intptr_t)osfh,
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_O_APPEND | _O_TEXT)) == -1)
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{
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CloseHandle(osfh);
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return NULL;
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}
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if (_dup2(handle_fd, fd) < 0)
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{
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CloseHandle(osfh);
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return NULL;
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}
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_close(handle_fd);
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return stream;
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}
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#elif defined(__FreeBSD__)
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/* No close operation hook. */
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static int no_close(void *cookie __attribute__((unused)))
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{
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return 0;
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}
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/*
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A hack around a race condition in the implementation of freopen.
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The race condition steams from the fact that the current fd of
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the stream is closed before its number is used to duplicate the
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new file descriptor. This defeats the desired atomicity of the
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close and duplicate of dup2().
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See PR number 79887 for reference:
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http://www.freebsd.org/cgi/query-pr.cgi?pr=79887
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*/
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static FILE *my_freebsd_freopen(const char *path, const char *mode, FILE *stream)
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{
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int old_fd;
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FILE *result;
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flockfile(stream);
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old_fd= fileno(stream);
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/* Use a no operation close hook to avoid having the fd closed. */
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stream->_close= no_close;
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/* Relies on the implicit dup2 to close old_fd. */
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result= freopen(path, mode, stream);
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/* If successful, the _close hook was replaced. */
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if (result == NULL)
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close(old_fd);
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else
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funlockfile(result);
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return result;
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}
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#endif
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/**
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Change the file associated with a file stream.
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@param path Path to file.
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@param mode Mode of the stream.
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@param stream File stream.
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@note
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This function is used to redirect stdout and stderr to a file and
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subsequently to close and reopen that file for log rotation.
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@retval A FILE pointer on success. Otherwise, NULL.
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*/
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FILE *my_freopen(const char *path, const char *mode, FILE *stream)
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{
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FILE *result;
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#if defined(_WIN32)
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result= my_win_freopen(path, mode, stream);
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#elif defined(__FreeBSD__)
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/*
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XXX: Once the fix is ported to the stable releases, this should
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be dependent upon the specific FreeBSD versions. Check at:
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http://www.freebsd.org/cgi/query-pr.cgi?pr=79887
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*/
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if (getosreldate() > 900027)
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result= freopen(path, mode, stream);
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else
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result= my_freebsd_freopen(path, mode, stream);
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#else
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result= freopen(path, mode, stream);
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#endif
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return result;
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}
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/* Close a stream */
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int my_fclose(FILE *fd, myf MyFlags)
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{
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int err,file;
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DBUG_ENTER("my_fclose");
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DBUG_PRINT("my",("stream: 0x%lx MyFlags: %d", (long) fd, MyFlags));
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mysql_mutex_lock(&THR_LOCK_open);
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file= my_fileno(fd);
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#ifndef _WIN32
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err= fclose(fd);
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#else
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err= my_win_fclose(fd);
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#endif
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if(err < 0)
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{
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my_errno=errno;
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if (MyFlags & (MY_FAE | MY_WME))
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my_error(EE_BADCLOSE, MYF(ME_BELL+ME_WAITTANG),
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my_filename(file),errno);
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}
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else
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my_stream_opened--;
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if ((uint) file < my_file_limit && my_file_info[file].type != UNOPEN)
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{
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my_file_info[file].type = UNOPEN;
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my_free(my_file_info[file].name);
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}
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mysql_mutex_unlock(&THR_LOCK_open);
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DBUG_RETURN(err);
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} /* my_fclose */
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/* Make a stream out of a file handle */
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/* Name may be 0 */
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FILE *my_fdopen(File Filedes, const char *name, int Flags, myf MyFlags)
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{
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FILE *fd;
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char type[5];
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DBUG_ENTER("my_fdopen");
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DBUG_PRINT("my",("Fd: %d Flags: %d MyFlags: %d",
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Filedes, Flags, MyFlags));
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make_ftype(type,Flags);
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#ifdef _WIN32
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fd= my_win_fdopen(Filedes, type);
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#else
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fd= fdopen(Filedes, type);
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#endif
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if (!fd)
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{
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my_errno=errno;
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if (MyFlags & (MY_FAE | MY_WME))
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my_error(EE_CANT_OPEN_STREAM, MYF(ME_BELL+ME_WAITTANG),errno);
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}
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else
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{
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mysql_mutex_lock(&THR_LOCK_open);
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my_stream_opened++;
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if ((uint) Filedes < (uint) my_file_limit)
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{
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if (my_file_info[Filedes].type != UNOPEN)
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{
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my_file_opened--; /* File is opened with my_open ! */
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}
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else
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{
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my_file_info[Filedes].name= my_strdup(name,MyFlags);
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}
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my_file_info[Filedes].type = STREAM_BY_FDOPEN;
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}
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mysql_mutex_unlock(&THR_LOCK_open);
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}
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DBUG_PRINT("exit",("stream: 0x%lx", (long) fd));
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DBUG_RETURN(fd);
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} /* my_fdopen */
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/*
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Make a fopen() typestring from a open() type bitmap
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SYNOPSIS
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make_ftype()
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to String for fopen() is stored here
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flag Flag used by open()
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IMPLEMENTATION
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This routine attempts to find the best possible match
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between a numeric option and a string option that could be
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fed to fopen. There is not a 1 to 1 mapping between the two.
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NOTE
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On Unix, O_RDONLY is usually 0
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MAPPING
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r == O_RDONLY
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w == O_WRONLY|O_TRUNC|O_CREAT
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a == O_WRONLY|O_APPEND|O_CREAT
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r+ == O_RDWR
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w+ == O_RDWR|O_TRUNC|O_CREAT
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a+ == O_RDWR|O_APPEND|O_CREAT
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*/
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static void make_ftype(register char * to, register int flag)
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{
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/* check some possible invalid combinations */
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DBUG_ASSERT((flag & (O_TRUNC | O_APPEND)) != (O_TRUNC | O_APPEND));
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DBUG_ASSERT((flag & (O_WRONLY | O_RDWR)) != (O_WRONLY | O_RDWR));
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if ((flag & (O_RDONLY|O_WRONLY)) == O_WRONLY)
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*to++= (flag & O_APPEND) ? 'a' : 'w';
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else if (flag & O_RDWR)
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{
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/* Add '+' after theese */
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if (flag & (O_TRUNC | O_CREAT))
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*to++= 'w';
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else if (flag & O_APPEND)
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*to++= 'a';
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else
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*to++= 'r';
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*to++= '+';
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}
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else
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*to++= 'r';
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#if FILE_BINARY /* If we have binary-files */
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if (flag & FILE_BINARY)
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*to++='b';
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#endif
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*to='\0';
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} /* make_ftype */
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