diff options
Diffstat (limited to 'nsprpub/pr/src/md/windows/w32shm.c')
| -rw-r--r-- | nsprpub/pr/src/md/windows/w32shm.c | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/windows/w32shm.c b/nsprpub/pr/src/md/windows/w32shm.c new file mode 100644 index 000000000..8e8b1d684 --- /dev/null +++ b/nsprpub/pr/src/md/windows/w32shm.c @@ -0,0 +1,347 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include <private/primpl.h> +#include <string.h> +#include <prshm.h> +#include <prerr.h> +#include <prmem.h> + +#if defined(PR_HAVE_WIN32_NAMED_SHARED_MEMORY) + +extern PRLogModuleInfo *_pr_shm_lm; + +/* + * NSPR-to-NT access right mapping table for file-mapping objects. + * + * The OR of these three access masks must equal FILE_MAP_ALL_ACCESS. + * This is because if a file-mapping object with the specified name + * exists, CreateFileMapping requests full access to the existing + * object. + */ +static DWORD filemapAccessTable[] = { + FILE_MAP_ALL_ACCESS & ~FILE_MAP_WRITE, /* read */ + FILE_MAP_ALL_ACCESS & ~FILE_MAP_READ, /* write */ + 0 /* execute */ +}; + +extern PRSharedMemory * _MD_OpenSharedMemory( + const char *name, + PRSize size, + PRIntn flags, + PRIntn mode +) +{ + char ipcname[PR_IPC_NAME_SIZE]; + PRStatus rc = PR_SUCCESS; + DWORD dwHi, dwLo; + PRSharedMemory *shm; + DWORD flProtect = ( PAGE_READWRITE ); + SECURITY_ATTRIBUTES sa; + LPSECURITY_ATTRIBUTES lpSA = NULL; + PSECURITY_DESCRIPTOR pSD = NULL; + PACL pACL = NULL; + + rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm ); + if ( PR_FAILURE == rc ) + { + PR_SetError(PR_UNKNOWN_ERROR, 0 ); + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: name is invalid")); + return(NULL); + } + + shm = PR_NEWZAP( PRSharedMemory ); + if ( NULL == shm ) + { + PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 ); + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory")); + return(NULL); + } + + shm->ipcname = PR_MALLOC( (PRUint32) (strlen( ipcname ) + 1) ); + if ( NULL == shm->ipcname ) + { + PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 ); + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory")); + PR_DELETE(shm); + return(NULL); + } + + /* copy args to struct */ + strcpy( shm->ipcname, ipcname ); + shm->size = size; + shm->mode = mode; + shm->flags = flags; + shm->ident = _PR_SHM_IDENT; + + if (flags & PR_SHM_CREATE ) { + dwHi = (DWORD) (((PRUint64) shm->size >> 32) & 0xffffffff); + dwLo = (DWORD) (shm->size & 0xffffffff); + + if (_PR_NT_MakeSecurityDescriptorACL(mode, filemapAccessTable, + &pSD, &pACL) == PR_SUCCESS) { + sa.nLength = sizeof(sa); + sa.lpSecurityDescriptor = pSD; + sa.bInheritHandle = FALSE; + lpSA = &sa; + } +#ifdef WINCE + { + /* + * This is assuming that the name will never be larger than + * MAX_PATH. Should we dynamically allocate? + */ + PRUnichar wideIpcName[MAX_PATH]; + MultiByteToWideChar(CP_ACP, 0, shm->ipcname, -1, + wideIpcName, MAX_PATH); + shm->handle = CreateFileMappingW( + (HANDLE)-1 , + lpSA, + flProtect, + dwHi, + dwLo, + wideIpcName); + } +#else + shm->handle = CreateFileMappingA( + (HANDLE)-1 , + lpSA, + flProtect, + dwHi, + dwLo, + shm->ipcname); +#endif + if (lpSA != NULL) { + _PR_NT_FreeSecurityDescriptorACL(pSD, pACL); + } + + if ( NULL == shm->handle ) { + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, + ( "PR_OpenSharedMemory: CreateFileMapping() failed: %s", + shm->ipcname )); + _PR_MD_MAP_DEFAULT_ERROR( GetLastError()); + PR_FREEIF( shm->ipcname ) + PR_DELETE( shm ); + return(NULL); + } else { + if (( flags & PR_SHM_EXCL) && ( GetLastError() == ERROR_ALREADY_EXISTS )) { + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, + ( "PR_OpenSharedMemory: Request exclusive & already exists", + shm->ipcname )); + PR_SetError( PR_FILE_EXISTS_ERROR, ERROR_ALREADY_EXISTS ); + CloseHandle( shm->handle ); + PR_FREEIF( shm->ipcname ) + PR_DELETE( shm ); + return(NULL); + } else { + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, + ( "PR_OpenSharedMemory: CreateFileMapping() success: %s, handle: %d", + shm->ipcname, shm->handle )); + return(shm); + } + } + } else { +#ifdef WINCE + PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 ); + shm->handle = NULL; /* OpenFileMapping not supported */ +#else + shm->handle = OpenFileMapping( FILE_MAP_WRITE, TRUE, shm->ipcname ); +#endif + if ( NULL == shm->handle ) { + _PR_MD_MAP_DEFAULT_ERROR( GetLastError()); + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, + ( "PR_OpenSharedMemory: OpenFileMapping() failed: %s, error: %d", + shm->ipcname, PR_GetOSError())); + PR_FREEIF( shm->ipcname ); + PR_DELETE( shm ); + return(NULL); + } else { + PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, + ( "PR_OpenSharedMemory: OpenFileMapping() success: %s, handle: %d", + shm->ipcname, shm->handle )); + return(shm); + } + } + /* returns from separate paths */ +} + +extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags ) +{ + PRUint32 access = FILE_MAP_WRITE; + void *addr; + + PR_ASSERT( shm->ident == _PR_SHM_IDENT ); + + if ( PR_SHM_READONLY & flags ) + access = FILE_MAP_READ; + + addr = MapViewOfFile( shm->handle, + access, + 0, 0, + shm->size ); + + if ( NULL == addr ) { + _PR_MD_MAP_DEFAULT_ERROR( GetLastError()); + PR_LOG( _pr_shm_lm, PR_LOG_ERROR, + ("_MD_AttachSharedMemory: MapViewOfFile() failed. OSerror: %d", PR_GetOSError())); + } + + return( addr ); +} /* end _MD_ATTACH_SHARED_MEMORY() */ + + +extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr ) +{ + PRStatus rc = PR_SUCCESS; + BOOL wrc; + + PR_ASSERT( shm->ident == _PR_SHM_IDENT ); + + wrc = UnmapViewOfFile( addr ); + if ( FALSE == wrc ) + { + _PR_MD_MAP_DEFAULT_ERROR( GetLastError()); + PR_LOG( _pr_shm_lm, PR_LOG_ERROR, + ("_MD_DetachSharedMemory: UnmapViewOfFile() failed. OSerror: %d", PR_GetOSError())); + rc = PR_FAILURE; + } + + return( rc ); +} + + +extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm ) +{ + PRStatus rc = PR_SUCCESS; + BOOL wrc; + + PR_ASSERT( shm->ident == _PR_SHM_IDENT ); + + wrc = CloseHandle( shm->handle ); + if ( FALSE == wrc ) + { + _PR_MD_MAP_DEFAULT_ERROR( GetLastError()); + PR_LOG( _pr_shm_lm, PR_LOG_ERROR, + ("_MD_CloseSharedMemory: CloseHandle() failed. OSerror: %d", PR_GetOSError())); + rc = PR_FAILURE; + } + PR_FREEIF( shm->ipcname ); + PR_DELETE( shm ); + + return( rc ); +} /* end _MD_CLOSE_SHARED_MEMORY() */ + +extern PRStatus _MD_DeleteSharedMemory( const char *name ) +{ + return( PR_SUCCESS ); +} + + +/* +** Windows implementation of anonymous memory (file) map +*/ +extern PRLogModuleInfo *_pr_shma_lm; + +extern PRFileMap* _md_OpenAnonFileMap( + const char *dirName, + PRSize size, + PRFileMapProtect prot +) +{ + PRFileMap *fm; + HANDLE hFileMap; + + fm = PR_CreateFileMap( (PRFileDesc*)-1, size, prot ); + if ( NULL == fm ) { + PR_LOG( _pr_shma_lm, PR_LOG_DEBUG, + ("_md_OpenAnonFileMap(): PR_CreateFileMap(): failed")); + goto Finished; + } + + /* + ** Make fm->md.hFileMap inheritable. We can't use + ** GetHandleInformation and SetHandleInformation + ** because these two functions fail with + ** ERROR_CALL_NOT_IMPLEMENTED on Win95. + */ + if (DuplicateHandle(GetCurrentProcess(), fm->md.hFileMap, + GetCurrentProcess(), &hFileMap, + 0, TRUE /* inheritable */, + DUPLICATE_SAME_ACCESS) == FALSE) { + PR_SetError( PR_UNKNOWN_ERROR, GetLastError() ); + PR_LOG( _pr_shma_lm, PR_LOG_DEBUG, + ("_md_OpenAnonFileMap(): DuplicateHandle(): failed")); + PR_CloseFileMap( fm ); + fm = NULL; + goto Finished; + } + CloseHandle(fm->md.hFileMap); + fm->md.hFileMap = hFileMap; + +Finished: + return(fm); +} /* end md_OpenAnonFileMap() */ + +/* +** _md_ExportFileMapAsString() +** +*/ +extern PRStatus _md_ExportFileMapAsString( + PRFileMap *fm, + PRSize bufSize, + char *buf +) +{ + PRIntn written; + + written = PR_snprintf( buf, (PRUint32) bufSize, "%d:%" PR_PRIdOSFD ":%ld", + (PRIntn)fm->prot, (PROsfd)fm->md.hFileMap, (PRInt32)fm->md.dwAccess ); + + PR_LOG( _pr_shma_lm, PR_LOG_DEBUG, + ("_md_ExportFileMapAsString(): prot: %x, hFileMap: %x, dwAccess: %x", + fm->prot, fm->md.hFileMap, fm->md.dwAccess )); + + return((written == -1)? PR_FAILURE : PR_SUCCESS); +} /* end _md_ExportFileMapAsString() */ + + +/* +** _md_ImportFileMapFromString() +** +*/ +extern PRFileMap * _md_ImportFileMapFromString( + const char *fmstring +) +{ + PRIntn prot; + PROsfd hFileMap; + PRInt32 dwAccess; + PRFileMap *fm = NULL; + + PR_sscanf( fmstring, "%d:%" PR_SCNdOSFD ":%ld", + &prot, &hFileMap, &dwAccess ); + + fm = PR_NEWZAP(PRFileMap); + if ( NULL == fm ) { + PR_LOG( _pr_shma_lm, PR_LOG_DEBUG, + ("_md_ImportFileMapFromString(): PR_NEWZAP(): Failed")); + return(fm); + } + + fm->prot = (PRFileMapProtect)prot; + fm->md.hFileMap = (HANDLE)hFileMap; + fm->md.dwAccess = (DWORD)dwAccess; + fm->fd = (PRFileDesc*)-1; + + PR_LOG( _pr_shma_lm, PR_LOG_DEBUG, + ("_md_ImportFileMapFromString(): fm: %p, prot: %d, hFileMap: %8.8x, dwAccess: %8.8x, fd: %x", + fm, prot, fm->md.hFileMap, fm->md.dwAccess, fm->fd)); + return(fm); +} /* end _md_ImportFileMapFromString() */ + +#else +Error! Why is PR_HAVE_WIN32_NAMED_SHARED_MEMORY not defined? +#endif /* PR_HAVE_WIN32_NAMED_SHARED_MEMORY */ +/* --- end w32shm.c --- */ |