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* fork.cc (fork_child): Call fixup_mmaps_after_fork() before

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closing parent process handle.  Call fixup_mmaps_after_fork()
	with parent process handle as parameter.
	* mmap.cc (mmap_record::access): New method.
	(fixup_mmaps_after_fork): Take process handle as parameter.
	In case of FILE_MAP_COPY access, copy valid memory regions to child.
	* pinfo.h (fixup_mmaps_after_fork): Change prototype accordingly.
This commit is contained in:
Corinna Vinschen
2002-03-11 17:57:22 +00:00
parent eabb48d53d
commit 713fb38b7c
4 changed files with 39 additions and 5 deletions
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26
winsup/cygwin/mmap.cc
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@@ -98,6 +98,7 @@ class mmap_record
__off64_t map_map (__off64_t off, DWORD len);
BOOL unmap_map (caddr_t addr, DWORD len);
void fixup_map (void);
int access (char *address);
fhandler_base *alloc_fh ();
void free_fh (fhandler_base *fh);
@@ -219,6 +220,15 @@ mmap_record::fixup_map ()
&old_prot);
}
int
mmap_record::access (char *address)
{
if (address < base_address_ || address >= base_address_ + size_to_map_)
return 0;
DWORD off = (address - base_address_) / getpagesize ();
return MAP_ISSET (off);
}
static fhandler_disk_file fh_paging_file;
fhandler_base *
@@ -887,7 +897,7 @@ mprotect (caddr_t addr, size_t len, int prot)
*/
int __stdcall
fixup_mmaps_after_fork ()
fixup_mmaps_after_fork (HANDLE parent)
{
debug_printf ("recreate_mmaps_after_fork, mmapped_areas %p", mmapped_areas);
@@ -925,6 +935,20 @@ fixup_mmaps_after_fork ()
rec->get_address ());
return -1;
}
if (rec->get_access () == FILE_MAP_COPY)
{
for (char *address = rec->get_address ();
address < rec->get_address () + rec->get_size ();
address += getpagesize ())
if (rec->access (address)
&& !ReadProcessMemory (parent, address, address,
getpagesize (), NULL))
{
system_printf ("ReadProcessMemory failed for MAP_PRIVATE address %p, %E",
rec->get_address ());
return -1;
}
}
rec->fixup_map ();
}
}