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

3 files changed, 269 insertions, 0 deletions

diff --git a/osdep/Makefile b/osdep/Makefile
index 43f3e08d59..c0f7a2c7ec 100644
--- a/osdep/Makefile
+++ b/osdep/Makefile
@@ -26,6 +26,9 @@ getch = getch2-win.c
 endif
 ifeq ($(TARGET_OS),OS/2)
 getch = getch2-os2.c
+ifneq ($(HAVE_SYS_MMAN_H),yes)
+SRCS_COMMON += mmap-os2.c
+endif
 endif
 SRCS_COMMON += $(timer)
 SRCS_COMMON += $(getch)
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 );
+}
diff --git a/osdep/mmap.h b/osdep/mmap.h
new file mode 100644
index 0000000000..8a4ccc0abf
--- /dev/null
+++ b/osdep/mmap.h
@@ -0,0 +1,56 @@
+/*
+ * mmap declaration header for systems with missing/nonfunctional sys/mman.h
+ *
+ * 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.
+ */
+
+#ifndef MPLAYER_MMAP_H
+#define MPLAYER_MMAP_H
+
+/*
+ * Protections are chosen from these bits, or-ed together
+ */
+#define PROT_NONE   0x00 /* no permissions */
+#define PROT_READ   0x01 /* pages can be read */
+#define PROT_WRITE  0x02 /* pages can be written */
+#define PROT_EXEC   0x04 /* pages can be executed */
+
+/*
+ * Flags contain sharing type and options.
+ * Sharing types; choose one.
+ */
+#define MAP_SHARED  0x0001  /* share changes */
+#define MAP_PRIVATE 0x0002  /* changes are private */
+#define MAP_FIXED   0x0010  /* map addr must be exactly as requested */
+
+/*
+ * Mapping type
+ */
+#define MAP_ANON    0x1000  /* allocated from memory, swap space */
+
+/* MAP_FAILED is defined in config.h */
+
+#ifndef _MMAP_DECLARED
+#define _MMAP_DECLARED
+void *mmap( void *addr, size_t len, int prot, int flags, int fildes, off_t off );
+#endif
+int   munmap( void *addr, size_t len );
+int   mprotect( void *addr, size_t len, int prot );
+
+#endif /* MPLAYER_MMAP_H */