diff options
Diffstat (limited to 'osdep/mmap-os2.c')
| -rw-r--r-- | osdep/mmap-os2.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/osdep/mmap-os2.c b/osdep/mmap-os2.c new file mode 100644 index 0000000000..7646296cd9 --- /dev/null +++ b/osdep/mmap-os2.c @@ -0,0 +1,210 @@ +/* + * very simple implementation of mmap() for OS/2 + * + * Copyright (c) 2008 KO Myung-Hun (komh@chollian.net) + * + * This file is part of MPlayer. + * + * MPlayer 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. + * + * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#define INCL_DOS +#include <os2.h> + +#include <stdio.h> +#include <stdlib.h> +#include <io.h> +#include <sys/types.h> + +#include "config.h" +#include "mmap.h" +#include "mmap_anon.h" + +typedef struct os2_mmap_s +{ + void *addr; + size_t len; + int flags; + struct os2_mmap_s *prev; + struct os2_mmap_s *next; +} os2_mmap; +static os2_mmap *m_mmap = NULL; + +void *mmap( void *addr, size_t len, int prot, int flags, int fildes, off_t off ) +{ + os2_mmap *new_mmap; + + ULONG fl; + ULONG rc; + + void *ret; + + if( prot & PROT_WRITE ) + { + if( flags & MAP_SHARED ) + return MAP_FAILED; + + if( !( flags & MAP_PRIVATE )) + return MAP_FAILED; + } + + if( flags & MAP_FIXED ) + { + ULONG cb; + + cb = len; + rc = DosQueryMem( addr, &cb, &fl ); + if( rc || ( cb < len )) + return MAP_FAILED; + + rc = DosSetMem( addr, len, fPERM ); + if( rc ) + return MAP_FAILED; + + ret = addr; + } + else + { + // Allocate tiled memory compatible with 16-bit selectors + // 'fs_seg' in 'ldt_keeper.c' need this attribute + rc = DosAllocMem( &ret, len, fALLOC ); + if( rc ) + return MAP_FAILED; + } + + new_mmap = ( os2_mmap * )malloc( sizeof( os2_mmap )); + new_mmap->addr = ret; + new_mmap->len = len; + new_mmap->flags = flags; + new_mmap->prev = m_mmap; + new_mmap->next = NULL; + + if( m_mmap ) + m_mmap->next = new_mmap; + m_mmap = new_mmap; + + if( !( flags & MAP_ANON )) + { + int pos; + + /* Now read in the file */ + if(( pos = lseek( fildes, off, SEEK_SET )) == -1) + { + munmap( ret, len ); + + return MAP_FAILED; + } + + read( fildes, ret, len ); + lseek( fildes, pos, SEEK_SET ); /* Restore the file pointer */ + } + + fl = 0; + + if( prot & PROT_READ ) + fl |= PAG_READ; + + if( prot & PROT_WRITE ) + fl |= PAG_WRITE; + + if( prot & PROT_EXEC ) + fl |= PAG_EXECUTE; + + if( prot & PROT_NONE ) + fl |= PAG_GUARD; + + rc = DosSetMem( ret, len, fl ); + if( rc ) + { + munmap( ret, len ); + + return MAP_FAILED; + } + + return ret; +} + +int munmap( void *addr, size_t len ) +{ + os2_mmap *mm; + + for( mm = m_mmap; mm; mm = mm->prev ) + { + if( mm->addr == addr ) + break; + } + + if( mm ) + { + + if( !( mm->flags & MAP_FIXED )) + DosFreeMem( addr ); + + if( mm->next ) + mm->next->prev = mm->prev; + + if( mm->prev ) + mm->prev->next = mm->next; + + if( m_mmap == mm ) + m_mmap = mm->prev; + + free( mm ); + + return 0; + } + + return -1; +} + +int mprotect( void *addr, size_t len, int prot ) +{ + os2_mmap *mm; + + for( mm = m_mmap; mm; mm = mm->prev ) + { + if( mm->addr == addr ) + break; + } + + if( mm ) + { + ULONG fl; + + fl = 0; + + if( prot & PROT_READ ) + fl |= PAG_READ; + + if( prot & PROT_WRITE ) + fl |= PAG_WRITE; + + if( prot & PROT_EXEC ) + fl |= PAG_EXECUTE; + + if( prot & PROT_NONE ) + fl |= PAG_GUARD; + + if( DosSetMem( addr, len, fl ) == 0 ) + return 0; + } + + return -1; +} + +void *mmap_anon( void *addr, size_t len, int prot, int flags, off_t off ) +{ + return mmap( addr, len, prot, flags | MAP_ANON, -1, off ); +} |