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newlib-cygwin
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* shm.cc (struct shm_attached_list): Convert access type to ULONG. 

(fixup_shms_after_fork): Fix comment.  Use NtMapViewOfSection rather
	than MapViewOfFileEx to recreate shared memory regions.  Add function
	name to api_fatal output.
	(shmat): Use NtMapViewOfSection to create shared memory region
	top-down.
This commit is contained in:
Corinna Vinschen 2009-03-31 14:58:14 +00:00
parent 83fb2c849c
commit 1e4e6ee8f4
2 changed files with 30 additions and 13 deletions
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9
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,12 @@
2009-03-31 Corinna Vinschen <corinna@vinschen.de>
* shm.cc (struct shm_attached_list): Convert access type to ULONG.
(fixup_shms_after_fork): Fix comment. Use NtMapViewOfSection rather
than MapViewOfFileEx to recreate shared memory regions. Add function
name to api_fatal output.
(shmat): Use NtMapViewOfSection to create shared memory region
top-down.
2009-03-31 Corinna Vinschen <corinna@vinschen.de>
* ctype.cc: Remove implementation of ctype functions in favor of

34
winsup/cygwin/shm.cc
View File

@ -18,6 +18,7 @@ details. */
#include "cygserver_shm.h"
#include "cygtls.h"
#include "sync.h"
#include "ntdll.h"
/*
* client_request_shm Constructors
@ -104,7 +105,7 @@ struct shm_attached_list {
SLIST_ENTRY (shm_attached_list) sph_next;
vm_object_t ptr;
shm_shmid_list *parent;
int access;
ULONG access;
};
static SLIST_HEAD (, shm_attached_list) sph_list;
@ -129,15 +130,18 @@ fixup_shms_after_fork ()
return 0;
}
shm_attached_list *sph_entry;
/* Remove map from list... */
/* Reconstruct map from list... */
SLIST_FOREACH (sph_entry, &sph_list, sph_next)
{
vm_object_t ptr = MapViewOfFileEx (sph_entry->parent->hdl,
sph_entry->access, 0, 0,
sph_entry->parent->size,
sph_entry->ptr);
if (ptr != sph_entry->ptr)
api_fatal ("MapViewOfFileEx (%p), %E. Terminating.", sph_entry->ptr);
NTSTATUS status;
vm_object_t ptr = sph_entry->ptr;
ULONG viewsize = sph_entry->parent->size;
status = NtMapViewOfSection (sph_entry->parent->hdl, GetCurrentProcess (),
&ptr, 0, sph_entry->parent->size, NULL,
&viewsize, ViewShare, 0, sph_entry->access);
if (!NT_SUCCESS (status) || ptr != sph_entry->ptr)
api_fatal ("fixup_shms_after_fork: NtMapViewOfSection (%p), status %p. Terminating.",
sph_entry->ptr, status);
}
return 0;
}
@ -213,12 +217,16 @@ shmat (int shmid, const void *shmaddr, int shmflg)
--ssh_entry->ref_count;
return (void *) -1;
}
DWORD access = (shmflg & SHM_RDONLY) ? FILE_MAP_READ : FILE_MAP_WRITE;
vm_object_t ptr = MapViewOfFileEx (ssh_entry->hdl, access, 0, 0,
ssh_entry->size, attach_va);
if (!ptr)
NTSTATUS status;
vm_object_t ptr = NULL;
ULONG viewsize = ssh_entry->size;
ULONG access = (shmflg & SHM_RDONLY) ? PAGE_READONLY : PAGE_READWRITE;
status = NtMapViewOfSection (ssh_entry->hdl, GetCurrentProcess (), &ptr, 0,
ssh_entry->size, NULL, &viewsize, ViewShare,
MEM_TOP_DOWN, access);
if (!NT_SUCCESS (status))
{
__seterrno ();
__seterrno_from_nt_status (status);
delete sph_entry;
--ssh_entry->ref_count;
return (void *) -1;