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| /**************************************************************************** |
| * |
| * Open Watcom Project |
| * |
| * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
| * |
| * ======================================================================== |
| * |
| * This file contains Original Code and/or Modifications of Original |
| * Code as defined in and that are subject to the Sybase Open Watcom |
| * Public License version 1.0 (the 'License'). You may not use this file |
| * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
| * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
| * provided with the Original Code and Modifications, and is also |
| * available at www.sybase.com/developer/opensource. |
| * |
| * The Original Code and all software distributed under the License are |
| * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
| * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
| * NON-INFRINGEMENT. Please see the License for the specific language |
| * governing rights and limitations under the License. |
| * |
| * ======================================================================== |
| * |
| * Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE |
| * DESCRIBE IT HERE! |
| * |
| ****************************************************************************/ |
| |
| |
| #include "variety.h" |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <errno.h> |
| #include "rtdata.h" |
| #include "liballoc.h" |
| #include "fileacc.h" |
| #include "rtinit.h" |
| #include "seterrno.h" |
| #include "iomode.h" |
| #include "handleio.h" |
| |
| #ifdef DLHEAP |
| |
| void* _cdecl dlmalloc(size_t); |
| void _cdecl dlfree(void*); |
| void _cdecl mf_init(); |
| |
| #define malloc dlmalloc |
| #define free dlfree |
| #define realloc dlrealloc |
| |
| #define lib_malloc dlmalloc |
| #define lib_free dlfree |
| #define lib_realloc dlrealloc |
| |
| #endif |
| |
| #if defined(__NETWARE__) |
| #error NO IO MODE MANAGER UNDER NETWARE |
| #endif |
| |
| extern unsigned _HUGEDATA __init_mode[_NFILES]; |
| extern unsigned __NFiles; /* maximum # of files we can open */ |
| |
| static unsigned _init_NFiles; // original __NFiles value; |
| |
| void __grow_iomode( int num ) |
| { |
| unsigned *new; |
| |
| _AccessIOB(); |
| if( __io_mode == __init_mode ) |
| { |
| _init_NFiles = __NFiles; |
| new = (unsigned *) lib_malloc( num * sizeof( unsigned ) ); |
| if( new != NULL ) { |
| memcpy( new, __init_mode, __NFiles * sizeof(unsigned) ); |
| } |
| } |
| else |
| { |
| #if defined(__NETWARE__) |
| #else |
| new = (unsigned *) lib_realloc( __io_mode, num * sizeof( unsigned ) ); |
| #endif |
| } |
| if( new == NULL ) |
| { |
| __set_errno( ENOMEM ); |
| } |
| else |
| { |
| memset( &new[__NFiles], 0, (num-__NFiles)*sizeof(unsigned) ); |
| __io_mode = new; |
| __NFiles = num; |
| } |
| _ReleaseIOB(); |
| } |
| |
| void __shrink_iomode( void ) |
| { |
| _AccessIOB(); |
| // free any malloc'd iomode array |
| if( __io_mode != __init_mode ) |
| { |
| lib_free( __io_mode ); |
| __io_mode = __init_mode; |
| __NFiles = _init_NFiles; |
| } |
| _ReleaseIOB(); |
| } |
| |
| AYI(__shrink_iomode,INIT_PRIORITY_IOSTREAM); |
| |
| |
| #if defined(__WARP__) |
| |
| extern unsigned __NHandles; |
| |
| static void __preinit_iomode_os2(void) |
| { |
| LONG req_count; |
| ULONG curr_max_fh; |
| APIRET rc; |
| |
| // Ensure that the clib and OS file handle limits match |
| req_count = 0; |
| rc = DosSetRelMaxFH( &req_count, &curr_max_fh ); |
| if( rc == 0 ) { |
| __grow_iomode( curr_max_fh ); |
| __NHandles = curr_max_fh; // same as __set_handles |
| } |
| |
| } |
| |
| AXI( __preinit_iomode_os2, INIT_PRIORITY_RUNTIME ); |
| |
| #endif |
| |
| #define _INITIALIZED _DYNAMIC |
| |
| signed __SetIOMode( int handle, unsigned value ) |
| { |
| int i; |
| |
| if( handle >= __NFiles ) |
| { |
| i = __NFiles; // 20 -> (20+10+1) -> 31 |
| // 31 -> (31+15+1) -> 47 |
| // 47 -> (47+23+1) -> 71 |
| __grow_iomode( i + (i > 1) + 1 ); |
| } |
| if( handle >= __NFiles ) |
| { |
| // return an error indication (errno should be set to ENOMEM) |
| return( -1 ); |
| } |
| else |
| { |
| if( value != 0 ) |
| { |
| __ChkTTYIOMode( handle ); |
| __io_mode[handle] = value | _INITIALIZED; |
| } |
| else |
| { |
| __io_mode[handle] = value; /* we're closing it; smite _INITIALIZED */ |
| } |
| return( handle ); |
| } |
| } |