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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

45
winsup/cygwin/fhandler_mem.cc
View File

@ -94,7 +94,9 @@ fhandler_dev_mem::open (const char *, int flags, mode_t)
RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
OBJECT_ATTRIBUTES attr;
InitializeObjectAttributes(&attr, &memstr, OBJ_CASE_INSENSITIVE, NULL, NULL);
InitializeObjectAttributes(&attr, &memstr,
OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
NULL, NULL);
ACCESS_MASK section_access;
if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
@ -277,7 +279,9 @@ fhandler_dev_mem::mmap (caddr_t *addr, size_t len, DWORD access,
RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
OBJECT_ATTRIBUTES attr;
InitializeObjectAttributes(&attr, &memstr, OBJ_CASE_INSENSITIVE, NULL, NULL);
InitializeObjectAttributes(&attr, &memstr,
OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
NULL, NULL);
ACCESS_MASK section_access;
ULONG protect;
@ -359,6 +363,43 @@ fhandler_dev_mem::msync (HANDLE h, caddr_t addr, size_t len, int flags)
return 0;
}
BOOL
fhandler_dev_mem::fixup_mmap_after_fork (HANDLE h, DWORD access, DWORD offset,
DWORD size, void *address)
{
DWORD ret;
PHYSICAL_ADDRESS phys;
void *base = address;
DWORD dlen = size;
ULONG protect;
if (access & FILE_MAP_COPY)
protect = PAGE_WRITECOPY;
else if (access & FILE_MAP_WRITE)
protect = PAGE_READWRITE;
else
protect = PAGE_READONLY;
phys.QuadPart = (ULONGLONG) offset;
if ((ret = NtMapViewOfSection (h,
INVALID_HANDLE_VALUE,
&base,
0L,
dlen,
&phys,
&dlen,
ViewShare /*??*/,
0,
protect)) != STATUS_SUCCESS)
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
syscall_printf ("-1 = fixup_mmap_after_fork(): NtMapViewOfSection failed with %E");
return FALSE;
}
return base == address;
}
int
fhandler_dev_mem::fstat (struct stat *buf)
{