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https://github.com/mpv-player/mpv
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mmap() support for OS/2
patch by KO Myung-Hun, komh chollian net git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26108 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
diego
parent
99a840529a
commit
effb6040ee
@ -26,6 +26,9 @@ getch = getch2-win.c
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endif
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ifeq ($(TARGET_OS),OS/2)
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getch = getch2-os2.c
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ifneq ($(HAVE_SYS_MMAN_H),yes)
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SRCS_COMMON += mmap-os2.c
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endif
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endif
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SRCS_COMMON += $(timer)
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SRCS_COMMON += $(getch)
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210
osdep/mmap-os2.c
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210
osdep/mmap-os2.c
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@ -0,0 +1,210 @@
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/*
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* very simple implementation of mmap() for OS/2
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*
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* Copyright (c) 2008 KO Myung-Hun (komh@chollian.net)
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*
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* This file is part of MPlayer.
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*
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* MPlayer 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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#define INCL_DOS
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#include <os2.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <io.h>
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#include <sys/types.h>
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#include "config.h"
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#include "mmap.h"
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#include "mmap_anon.h"
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typedef struct os2_mmap_s
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{
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void *addr;
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size_t len;
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int flags;
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struct os2_mmap_s *prev;
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struct os2_mmap_s *next;
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} os2_mmap;
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static os2_mmap *m_mmap = NULL;
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void *mmap( void *addr, size_t len, int prot, int flags, int fildes, off_t off )
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{
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os2_mmap *new_mmap;
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ULONG fl;
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ULONG rc;
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void *ret;
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if( prot & PROT_WRITE )
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{
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if( flags & MAP_SHARED )
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return MAP_FAILED;
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if( !( flags & MAP_PRIVATE ))
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return MAP_FAILED;
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}
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if( flags & MAP_FIXED )
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{
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ULONG cb;
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cb = len;
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rc = DosQueryMem( addr, &cb, &fl );
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if( rc || ( cb < len ))
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return MAP_FAILED;
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rc = DosSetMem( addr, len, fPERM );
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if( rc )
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return MAP_FAILED;
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ret = addr;
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}
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else
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{
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// Allocate tiled memory compatible with 16-bit selectors
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// 'fs_seg' in 'ldt_keeper.c' need this attribute
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rc = DosAllocMem( &ret, len, fALLOC );
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if( rc )
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return MAP_FAILED;
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}
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new_mmap = ( os2_mmap * )malloc( sizeof( os2_mmap ));
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new_mmap->addr = ret;
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new_mmap->len = len;
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new_mmap->flags = flags;
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new_mmap->prev = m_mmap;
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new_mmap->next = NULL;
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if( m_mmap )
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m_mmap->next = new_mmap;
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m_mmap = new_mmap;
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if( !( flags & MAP_ANON ))
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{
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int pos;
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/* Now read in the file */
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if(( pos = lseek( fildes, off, SEEK_SET )) == -1)
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{
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munmap( ret, len );
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return MAP_FAILED;
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}
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read( fildes, ret, len );
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lseek( fildes, pos, SEEK_SET ); /* Restore the file pointer */
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}
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fl = 0;
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if( prot & PROT_READ )
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fl |= PAG_READ;
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if( prot & PROT_WRITE )
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fl |= PAG_WRITE;
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if( prot & PROT_EXEC )
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fl |= PAG_EXECUTE;
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if( prot & PROT_NONE )
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fl |= PAG_GUARD;
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rc = DosSetMem( ret, len, fl );
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if( rc )
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{
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munmap( ret, len );
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return MAP_FAILED;
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}
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return ret;
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}
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int munmap( void *addr, size_t len )
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{
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os2_mmap *mm;
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for( mm = m_mmap; mm; mm = mm->prev )
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{
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if( mm->addr == addr )
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break;
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}
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if( mm )
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{
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if( !( mm->flags & MAP_FIXED ))
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DosFreeMem( addr );
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if( mm->next )
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mm->next->prev = mm->prev;
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if( mm->prev )
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mm->prev->next = mm->next;
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if( m_mmap == mm )
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m_mmap = mm->prev;
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free( mm );
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return 0;
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}
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return -1;
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}
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int mprotect( void *addr, size_t len, int prot )
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{
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os2_mmap *mm;
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for( mm = m_mmap; mm; mm = mm->prev )
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{
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if( mm->addr == addr )
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break;
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}
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if( mm )
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{
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ULONG fl;
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fl = 0;
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if( prot & PROT_READ )
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fl |= PAG_READ;
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if( prot & PROT_WRITE )
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fl |= PAG_WRITE;
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if( prot & PROT_EXEC )
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fl |= PAG_EXECUTE;
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if( prot & PROT_NONE )
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fl |= PAG_GUARD;
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if( DosSetMem( addr, len, fl ) == 0 )
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return 0;
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}
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return -1;
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}
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void *mmap_anon( void *addr, size_t len, int prot, int flags, off_t off )
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{
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return mmap( addr, len, prot, flags | MAP_ANON, -1, off );
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}
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56
osdep/mmap.h
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56
osdep/mmap.h
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@ -0,0 +1,56 @@
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/*
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* mmap declaration header for systems with missing/nonfunctional sys/mman.h
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*
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* Copyright (c) 2008 KO Myung-Hun (komh@chollian.net)
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*
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* This file is part of MPlayer.
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*
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* MPlayer 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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPLAYER_MMAP_H
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#define MPLAYER_MMAP_H
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/*
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* Protections are chosen from these bits, or-ed together
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*/
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#define PROT_NONE 0x00 /* no permissions */
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#define PROT_READ 0x01 /* pages can be read */
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#define PROT_WRITE 0x02 /* pages can be written */
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#define PROT_EXEC 0x04 /* pages can be executed */
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/*
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* Flags contain sharing type and options.
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* Sharing types; choose one.
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*/
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#define MAP_SHARED 0x0001 /* share changes */
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#define MAP_PRIVATE 0x0002 /* changes are private */
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#define MAP_FIXED 0x0010 /* map addr must be exactly as requested */
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/*
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* Mapping type
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*/
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#define MAP_ANON 0x1000 /* allocated from memory, swap space */
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/* MAP_FAILED is defined in config.h */
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#ifndef _MMAP_DECLARED
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#define _MMAP_DECLARED
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void *mmap( void *addr, size_t len, int prot, int flags, int fildes, off_t off );
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#endif
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int munmap( void *addr, size_t len );
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int mprotect( void *addr, size_t len, int prot );
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#endif /* MPLAYER_MMAP_H */
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