633 lines
18 KiB
C
633 lines
18 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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** uxshm.c -- Unix Implementations NSPR Named Shared Memory
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**
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**
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** lth. Jul-1999.
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**
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*/
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#include <string.h>
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#include <prshm.h>
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#include <prerr.h>
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#include <prmem.h>
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#include "primpl.h"
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#include <fcntl.h>
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extern PRLogModuleInfo *_pr_shm_lm;
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#define NSPR_IPC_SHM_KEY 'b'
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/*
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** Implementation for System V
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*/
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#if defined PR_HAVE_SYSV_NAMED_SHARED_MEMORY
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define _MD_OPEN_SHARED_MEMORY _MD_OpenSharedMemory
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#define _MD_ATTACH_SHARED_MEMORY _MD_AttachSharedMemory
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#define _MD_DETACH_SHARED_MEMORY _MD_DetachSharedMemory
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#define _MD_CLOSE_SHARED_MEMORY _MD_CloseSharedMemory
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#define _MD_DELETE_SHARED_MEMORY _MD_DeleteSharedMemory
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extern PRSharedMemory * _MD_OpenSharedMemory(
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const char *name,
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PRSize size,
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PRIntn flags,
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PRIntn mode
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)
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{
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PRStatus rc = PR_SUCCESS;
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key_t key;
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PRSharedMemory *shm;
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char ipcname[PR_IPC_NAME_SIZE];
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rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
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if ( PR_FAILURE == rc )
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{
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
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return( NULL );
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}
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shm = PR_NEWZAP( PRSharedMemory );
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if ( NULL == shm )
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{
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PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
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PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory"));
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return( NULL );
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}
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shm->ipcname = (char*)PR_MALLOC( strlen( ipcname ) + 1 );
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if ( NULL == shm->ipcname )
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{
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PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
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PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory"));
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PR_DELETE( shm );
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return( NULL );
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}
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/* copy args to struct */
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strcpy( shm->ipcname, ipcname );
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shm->size = size;
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shm->mode = mode;
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shm->flags = flags;
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shm->ident = _PR_SHM_IDENT;
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/* create the file first */
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if ( flags & PR_SHM_CREATE ) {
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int osfd = open( shm->ipcname, (O_RDWR | O_CREAT), shm->mode );
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if ( -1 == osfd ) {
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_PR_MD_MAP_OPEN_ERROR( errno );
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PR_FREEIF( shm->ipcname );
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PR_DELETE( shm );
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return( NULL );
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}
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if ( close(osfd) == -1 ) {
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_PR_MD_MAP_CLOSE_ERROR( errno );
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PR_FREEIF( shm->ipcname );
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PR_DELETE( shm );
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return( NULL );
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}
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}
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/* hash the shm.name to an ID */
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key = ftok( shm->ipcname, NSPR_IPC_SHM_KEY );
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if ( -1 == key )
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{
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rc = PR_FAILURE;
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): ftok() failed on name: %s", shm->ipcname));
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PR_FREEIF( shm->ipcname );
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PR_DELETE( shm );
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return( NULL );
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}
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/* get the shared memory */
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if ( flags & PR_SHM_CREATE ) {
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shm->id = shmget( key, shm->size, ( shm->mode | IPC_CREAT|IPC_EXCL));
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if ( shm->id >= 0 ) {
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return( shm );
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}
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if ((errno == EEXIST) && (flags & PR_SHM_EXCL)) {
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PR_SetError( PR_FILE_EXISTS_ERROR, errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): shmget() exclusive failed, errno: %d", errno));
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PR_FREEIF(shm->ipcname);
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PR_DELETE(shm);
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return(NULL);
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}
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}
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shm->id = shmget( key, shm->size, shm->mode );
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if ( -1 == shm->id ) {
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): shmget() failed, errno: %d", errno));
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PR_FREEIF(shm->ipcname);
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PR_DELETE(shm);
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return(NULL);
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}
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return( shm );
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} /* end _MD_OpenSharedMemory() */
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extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags )
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{
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void *addr;
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PRUint32 aFlags = shm->mode;
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PR_ASSERT( shm->ident == _PR_SHM_IDENT );
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aFlags |= (flags & PR_SHM_READONLY )? SHM_RDONLY : 0;
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addr = shmat( shm->id, NULL, aFlags );
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if ( (void*)-1 == addr )
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{
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_AttachSharedMemory(): shmat() failed on name: %s, OsError: %d",
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shm->ipcname, PR_GetOSError() ));
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addr = NULL;
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}
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return addr;
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}
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extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr )
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{
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PRStatus rc = PR_SUCCESS;
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PRIntn urc;
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PR_ASSERT( shm->ident == _PR_SHM_IDENT );
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urc = shmdt( addr );
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if ( -1 == urc )
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{
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rc = PR_FAILURE;
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DetachSharedMemory(): shmdt() failed on name: %s", shm->ipcname ));
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}
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return rc;
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}
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extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm )
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{
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PR_ASSERT( shm->ident == _PR_SHM_IDENT );
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PR_FREEIF(shm->ipcname);
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PR_DELETE(shm);
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return PR_SUCCESS;
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}
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extern PRStatus _MD_DeleteSharedMemory( const char *name )
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{
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PRStatus rc = PR_SUCCESS;
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key_t key;
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int id;
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PRIntn urc;
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char ipcname[PR_IPC_NAME_SIZE];
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rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
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if ( PR_FAILURE == rc )
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{
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PR_SetError( PR_UNKNOWN_ERROR, errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DeleteSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
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return(PR_FAILURE);
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}
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/* create the file first */
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{
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int osfd = open( ipcname, (O_RDWR | O_CREAT), 0666 );
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if ( -1 == osfd ) {
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_PR_MD_MAP_OPEN_ERROR( errno );
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return( PR_FAILURE );
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}
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if ( close(osfd) == -1 ) {
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_PR_MD_MAP_CLOSE_ERROR( errno );
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return( PR_FAILURE );
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}
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}
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/* hash the shm.name to an ID */
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key = ftok( ipcname, NSPR_IPC_SHM_KEY );
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if ( -1 == key )
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{
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rc = PR_FAILURE;
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DeleteSharedMemory(): ftok() failed on name: %s", ipcname));
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}
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id = shmget( key, 0, 0 );
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if ( -1 == id ) {
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DeleteSharedMemory(): shmget() failed, errno: %d", errno));
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return(PR_FAILURE);
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}
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urc = shmctl( id, IPC_RMID, NULL );
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if ( -1 == urc )
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{
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DeleteSharedMemory(): shmctl() failed on name: %s", ipcname ));
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return(PR_FAILURE);
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}
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urc = unlink( ipcname );
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if ( -1 == urc ) {
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_PR_MD_MAP_UNLINK_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DeleteSharedMemory(): unlink() failed: %s", ipcname ));
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return(PR_FAILURE);
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}
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return rc;
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} /* end _MD_DeleteSharedMemory() */
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/*
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** Implementation for Posix
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*/
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#elif defined PR_HAVE_POSIX_NAMED_SHARED_MEMORY
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#include <sys/mman.h>
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#define _MD_OPEN_SHARED_MEMORY _MD_OpenSharedMemory
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#define _MD_ATTACH_SHARED_MEMORY _MD_AttachSharedMemory
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#define _MD_DETACH_SHARED_MEMORY _MD_DetachSharedMemory
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#define _MD_CLOSE_SHARED_MEMORY _MD_CloseSharedMemory
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#define _MD_DELETE_SHARED_MEMORY _MD_DeleteSharedMemory
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struct _MDSharedMemory {
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int handle;
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};
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extern PRSharedMemory * _MD_OpenSharedMemory(
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const char *name,
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PRSize size,
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PRIntn flags,
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PRIntn mode
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)
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{
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PRStatus rc = PR_SUCCESS;
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PRInt32 end;
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PRSharedMemory *shm;
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char ipcname[PR_IPC_NAME_SIZE];
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rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
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if ( PR_FAILURE == rc )
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{
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PR_SetError( PR_UNKNOWN_ERROR, errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
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return( NULL );
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}
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shm = PR_NEWZAP( PRSharedMemory );
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if ( NULL == shm )
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{
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PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
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PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory"));
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return( NULL );
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}
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shm->ipcname = PR_MALLOC( strlen( ipcname ) + 1 );
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if ( NULL == shm->ipcname )
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{
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PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
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PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory"));
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return( NULL );
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}
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/* copy args to struct */
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strcpy( shm->ipcname, ipcname );
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shm->size = size;
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shm->mode = mode;
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shm->flags = flags;
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shm->ident = _PR_SHM_IDENT;
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/*
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** Create the shared memory
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*/
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if ( flags & PR_SHM_CREATE ) {
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int oflag = (O_CREAT | O_RDWR);
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if ( flags & PR_SHM_EXCL ) {
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oflag |= O_EXCL;
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}
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shm->id = shm_open( shm->ipcname, oflag, shm->mode );
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} else {
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shm->id = shm_open( shm->ipcname, O_RDWR, shm->mode );
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}
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if ( -1 == shm->id ) {
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG(_pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): shm_open failed: %s, OSError: %d",
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shm->ipcname, PR_GetOSError()));
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PR_DELETE( shm->ipcname );
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PR_DELETE( shm );
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return(NULL);
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}
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end = ftruncate( shm->id, shm->size );
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if ( -1 == end ) {
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG(_pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): ftruncate failed, OSError: %d",
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PR_GetOSError()));
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PR_DELETE( shm->ipcname );
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PR_DELETE( shm );
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return(NULL);
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}
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return(shm);
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} /* end _MD_OpenSharedMemory() */
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extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags )
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{
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void *addr;
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PRIntn prot = (PROT_READ | PROT_WRITE);
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PR_ASSERT( shm->ident == _PR_SHM_IDENT );
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if ( PR_SHM_READONLY == flags) {
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prot ^= PROT_WRITE;
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}
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addr = mmap( (void*)0, shm->size, prot, MAP_SHARED, shm->id, 0 );
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if ((void*)-1 == addr )
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{
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_AttachSharedMemory(): mmap failed: %s, errno: %d",
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shm->ipcname, PR_GetOSError()));
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addr = NULL;
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} else {
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_AttachSharedMemory(): name: %s, attached at: %p", shm->ipcname, addr));
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}
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return addr;
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}
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extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr )
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{
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PRStatus rc = PR_SUCCESS;
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PRIntn urc;
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PR_ASSERT( shm->ident == _PR_SHM_IDENT );
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urc = munmap( addr, shm->size );
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if ( -1 == urc )
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{
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rc = PR_FAILURE;
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DetachSharedMemory(): munmap failed: %s, errno: %d",
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shm->ipcname, PR_GetOSError()));
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}
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return rc;
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}
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extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm )
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{
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int urc;
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PR_ASSERT( shm->ident == _PR_SHM_IDENT );
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urc = close( shm->id );
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if ( -1 == urc ) {
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_PR_MD_MAP_CLOSE_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_CloseSharedMemory(): close() failed, error: %d", PR_GetOSError()));
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return(PR_FAILURE);
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}
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PR_DELETE( shm->ipcname );
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PR_DELETE( shm );
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return PR_SUCCESS;
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}
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extern PRStatus _MD_DeleteSharedMemory( const char *name )
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{
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PRStatus rc = PR_SUCCESS;
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PRUintn urc;
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char ipcname[PR_IPC_NAME_SIZE];
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rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
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if ( PR_FAILURE == rc )
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{
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PR_SetError( PR_UNKNOWN_ERROR, errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
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return rc;
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}
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urc = shm_unlink( ipcname );
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if ( -1 == urc ) {
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rc = PR_FAILURE;
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_PR_MD_MAP_DEFAULT_ERROR( errno );
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DeleteSharedMemory(): shm_unlink failed: %s, errno: %d",
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ipcname, PR_GetOSError()));
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} else {
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PR_LOG( _pr_shm_lm, PR_LOG_DEBUG,
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("_MD_DeleteSharedMemory(): %s, success", ipcname));
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}
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return rc;
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} /* end _MD_DeleteSharedMemory() */
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#endif
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/*
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** Unix implementation for anonymous memory (file) mapping
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*/
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extern PRLogModuleInfo *_pr_shma_lm;
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#include <unistd.h>
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extern PRFileMap* _md_OpenAnonFileMap(
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const char *dirName,
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PRSize size,
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PRFileMapProtect prot
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)
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{
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PRFileMap *fm = NULL;
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PRFileDesc *fd;
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int osfd;
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PRIntn urc;
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PRIntn mode = 0600;
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char *genName;
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pid_t pid = getpid(); /* for generating filename */
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PRThread *tid = PR_GetCurrentThread(); /* for generating filename */
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int incr; /* for generating filename */
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const int maxTries = 20; /* maximum # attempts at a unique filename */
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PRInt64 size64; /* 64-bit version of 'size' */
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/*
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** generate a filename from input and runtime environment
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** open the file, unlink the file.
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** make maxTries number of attempts at uniqueness in the filename
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*/
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for ( incr = 0; incr < maxTries ; incr++ ) {
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#define NSPR_AFM_FILENAME "%s/.NSPR-AFM-%d-%p.%d"
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genName = PR_smprintf( NSPR_AFM_FILENAME,
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dirName, (int) pid, tid, incr );
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if ( NULL == genName ) {
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PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): PR_snprintf(): failed, generating filename"));
|
|
goto Finished;
|
|
}
|
|
|
|
/* create the file */
|
|
osfd = open(genName, (O_CREAT | O_EXCL | O_RDWR), mode);
|
|
if (-1 == osfd) {
|
|
if (EEXIST == errno) {
|
|
PR_smprintf_free(genName);
|
|
continue; /* name exists, try again */
|
|
}
|
|
_PR_MD_MAP_OPEN_ERROR(errno);
|
|
PR_LOG(
|
|
_pr_shma_lm,
|
|
PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): open(): failed, filename: %s, errno: %d",
|
|
genName,
|
|
PR_GetOSError()));
|
|
PR_smprintf_free(genName);
|
|
goto Finished;
|
|
}
|
|
break; /* name generation and open successful, break; */
|
|
} /* end for() */
|
|
|
|
if (incr == maxTries) {
|
|
PR_ASSERT(-1 == osfd);
|
|
PR_ASSERT(EEXIST == errno);
|
|
_PR_MD_MAP_OPEN_ERROR(errno);
|
|
goto Finished;
|
|
}
|
|
|
|
urc = unlink( genName );
|
|
if ( -1 == urc ) {
|
|
_PR_MD_MAP_UNLINK_ERROR( errno );
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): failed on unlink(), errno: %d", errno));
|
|
PR_smprintf_free( genName );
|
|
close( osfd );
|
|
goto Finished;
|
|
}
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): unlink(): %s", genName ));
|
|
|
|
PR_smprintf_free( genName );
|
|
|
|
fd = PR_ImportFile( osfd );
|
|
if ( NULL == fd ) {
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): PR_ImportFile(): failed"));
|
|
goto Finished;
|
|
}
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): fd: %p", fd ));
|
|
|
|
urc = ftruncate( fd->secret->md.osfd, size );
|
|
if ( -1 == urc ) {
|
|
_PR_MD_MAP_DEFAULT_ERROR( errno );
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): failed on ftruncate(), errno: %d", errno));
|
|
PR_Close( fd );
|
|
goto Finished;
|
|
}
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): ftruncate(): size: %d", size ));
|
|
|
|
LL_UI2L(size64, size); /* PRSize (size_t) is unsigned */
|
|
fm = PR_CreateFileMap( fd, size64, prot );
|
|
if ( NULL == fm ) {
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("PR_OpenAnonFileMap(): failed"));
|
|
PR_Close( fd );
|
|
goto Finished;
|
|
}
|
|
fm->md.isAnonFM = PR_TRUE; /* set fd close */
|
|
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_OpenAnonFileMap(): PR_CreateFileMap(): fm: %p", fm ));
|
|
|
|
Finished:
|
|
return(fm);
|
|
} /* end md_OpenAnonFileMap() */
|
|
|
|
/*
|
|
** _md_ExportFileMapAsString()
|
|
**
|
|
**
|
|
*/
|
|
extern PRStatus _md_ExportFileMapAsString(
|
|
PRFileMap *fm,
|
|
PRSize bufSize,
|
|
char *buf
|
|
)
|
|
{
|
|
PRIntn written;
|
|
PRIntn prot = (PRIntn)fm->prot;
|
|
|
|
written = PR_snprintf( buf, bufSize, "%ld:%d",
|
|
fm->fd->secret->md.osfd, prot );
|
|
|
|
return((written == -1)? PR_FAILURE : PR_SUCCESS);
|
|
} /* end _md_ExportFileMapAsString() */
|
|
|
|
|
|
extern PRFileMap * _md_ImportFileMapFromString(
|
|
const char *fmstring
|
|
)
|
|
{
|
|
PRStatus rc;
|
|
PRInt32 osfd;
|
|
PRIntn prot; /* really: a PRFileMapProtect */
|
|
PRFileDesc *fd;
|
|
PRFileMap *fm = NULL; /* default return value */
|
|
PRFileInfo64 info;
|
|
|
|
PR_sscanf( fmstring, "%ld:%d", &osfd, &prot );
|
|
|
|
/* import the os file descriptor */
|
|
fd = PR_ImportFile( osfd );
|
|
if ( NULL == fd ) {
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_ImportFileMapFromString(): PR_ImportFile() failed"));
|
|
goto Finished;
|
|
}
|
|
|
|
rc = PR_GetOpenFileInfo64( fd, &info );
|
|
if ( PR_FAILURE == rc ) {
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_ImportFileMapFromString(): PR_GetOpenFileInfo64() failed"));
|
|
goto Finished;
|
|
}
|
|
|
|
fm = PR_CreateFileMap( fd, info.size, (PRFileMapProtect)prot );
|
|
if ( NULL == fm ) {
|
|
PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
|
|
("_md_ImportFileMapFromString(): PR_CreateFileMap() failed"));
|
|
}
|
|
|
|
Finished:
|
|
return(fm);
|
|
} /* end _md_ImportFileMapFromString() */
|