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* fhandler.h (fhandler_base): New method `fixup_mmap_after_fork'.

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(fhandler_disk_file: Ditto.
        (fhandler_dev_mem): Ditto.
        * fhandler_mem.cc (fhandler_dev_mem::open): Set OBJ_INHERIT attribute
        for device\physicalmemory handle.
        (fhandler_dev_mem::mmap): Ditto.
        * fhandler_mem.cc (fhandler_dev_mem::fixup_mmap_after_fork): New method.
        * mmap.cc (mmap_record): Add private `fdesc_' member. Change constructor
        accordingly.
        (get_fd): New method.
        (mmap): Use new mmap_record constructor.
        (fhandler_base::fixup_mmap_after_fork): New method.
        (fhandler_disk_file::fixup_mmap_after_fork): Ditto.
        (fixup_mmaps_after_fork): Call `fixup_mmap_after_fork' of appropriate
        fhandler class.
This commit is contained in:
Corinna Vinschen
2001-01-11 12:33:12 +00:00
parent 37770e0009
commit c4efddf601
4 changed files with 108 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
winsup/cygwin/mmap.cc
View File

@@ -30,6 +30,7 @@ details. */
class mmap_record
{
private:
int fdesc_;
HANDLE mapping_handle_;
DWORD access_mode_;
DWORD offset_;
@@ -37,13 +38,14 @@ class mmap_record
void *base_address_;
public:
mmap_record (HANDLE h, DWORD ac, DWORD o, DWORD s, void *b) :
mapping_handle_ (h), access_mode_ (ac), offset_ (o),
mmap_record (int fd, HANDLE h, DWORD ac, DWORD o, DWORD s, void *b) :
fdesc_ (fd), mapping_handle_ (h), access_mode_ (ac), offset_ (o),
size_to_map_ (s), base_address_ (b) { ; }
/* Default Copy constructor/operator=/destructor are ok */
/* Simple accessors */
int get_fd () const { return fdesc_; }
HANDLE get_handle () const { return mapping_handle_; }
DWORD get_access () const { return access_mode_; }
DWORD get_offset () const { return offset_; }
@@ -206,6 +208,8 @@ mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t off)
{
fh_paging_file.set_io_handle (INVALID_HANDLE_VALUE);
fh = &fh_paging_file;
/* Ensure that fd is recorded as -1 */
fd = -1;
}
else
{
@@ -231,7 +235,7 @@ mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t off)
/* Now we should have a successfully mmaped area.
Need to save it so forked children can reproduce it.
*/
mmap_record mmap_rec (h, access, off, len, base);
mmap_record mmap_rec (fd, h, access, off, len, base);
/* Get list of mmapped areas for this fd, create a new one if
one does not exist yet.
@@ -434,6 +438,14 @@ fhandler_base::msync (HANDLE h, caddr_t addr, size_t len, int flags)
return -1;
}
BOOL
fhandler_base::fixup_mmap_after_fork (HANDLE h, DWORD access, DWORD offset,
DWORD size, void *address)
{
set_errno (ENODEV);
return -1;
}
/* Implementation for disk files. */
HANDLE
fhandler_disk_file::mmap (caddr_t *addr, size_t len, DWORD access,
@@ -498,6 +510,15 @@ fhandler_disk_file::msync (HANDLE h, caddr_t addr, size_t len, int flags)
return 0;
}
BOOL
fhandler_disk_file::fixup_mmap_after_fork (HANDLE h, DWORD access, DWORD offset,
DWORD size, void *address)
{
/* Re-create the MapViewOfFileEx call */
void *base = MapViewOfFileEx (h, access, 0, offset, size, address);
return base == address;
}
/* Set memory protection */
extern "C"
@@ -575,19 +596,25 @@ fixup_mmaps_after_fork ()
{
mmap_record rec = l->recs[li];
debug_printf ("h %x, access %x, offset %d, size %d, address %p",
rec.get_handle (), rec.get_access (), rec.get_offset (),
rec.get_size (), rec.get_address ());
debug_printf ("fd %d, h %x, access %x, offset %d, size %d, address %p",
rec.get_fd (), rec.get_handle (), rec.get_access (),
rec.get_offset (), rec.get_size (), rec.get_address ());
/* Now re-create the MapViewOfFileEx call */
void *base = MapViewOfFileEx (rec.get_handle (),
rec.get_access (), 0,
rec.get_offset (),
rec.get_size (),
rec.get_address ());
if (base != rec.get_address ())
BOOL ret;
fhandler_disk_file fh_paging_file (NULL);
fhandler_base *fh;
if (rec.get_fd () == -1) /* MAP_ANONYMOUS */
fh = &fh_paging_file;
else
fh = fdtab[rec.get_fd ()];
ret = fh->fixup_mmap_after_fork (rec.get_handle (),
rec.get_access (),
rec.get_offset (),
rec.get_size (),
rec.get_address ());
if (!ret)
{
system_printf ("base address %p fails to match requested address %p",
system_printf ("base address fails to match requested address %p",
rec.get_address ());
return -1;
}