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Sweden-Number/server/process.c

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/*
* Server-side process management
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#include <unistd.h>
#include "winbase.h"
#include "winnt.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
/* process structure */
static struct process *first_process;
static int running_processes;
/* process operations */
static void process_dump( struct object *obj, int verbose );
static int process_signaled( struct object *obj, struct thread *thread );
static void process_destroy( struct object *obj );
static const struct object_ops process_ops =
{
sizeof(struct process), /* size */
process_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
process_signaled, /* signaled */
no_satisfied, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
process_destroy /* destroy */
};
/* process startup info */
struct startup_info
{
struct object obj; /* object header */
int inherit_all; /* inherit all handles from parent */
int create_flags; /* creation flags */
int start_flags; /* flags from startup info */
handle_t hstdin; /* handle for stdin */
handle_t hstdout; /* handle for stdout */
handle_t hstderr; /* handle for stderr */
int cmd_show; /* main window show mode */
struct file *exe_file; /* file handle for main exe */
char *filename; /* file name for main exe */
struct thread *owner; /* owner thread (the one that created the new process) */
struct process *process; /* created process */
struct thread *thread; /* created thread */
};
static void startup_info_dump( struct object *obj, int verbose );
static int startup_info_signaled( struct object *obj, struct thread *thread );
static void startup_info_destroy( struct object *obj );
static const struct object_ops startup_info_ops =
{
sizeof(struct startup_info), /* size */
startup_info_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
startup_info_signaled, /* signaled */
no_satisfied, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
startup_info_destroy /* destroy */
};
/* set the console and stdio handles for a newly created process */
static int set_process_console( struct process *process, struct process *parent,
struct startup_info *info, struct init_process_request *req )
{
if (process->create_flags & CREATE_NEW_CONSOLE)
{
if (!alloc_console( process )) return 0;
}
else if (parent && !(process->create_flags & DETACHED_PROCESS))
{
if (parent->console_in) process->console_in = grab_object( parent->console_in );
if (parent->console_out) process->console_out = grab_object( parent->console_out );
}
if (parent)
{
if (!info->inherit_all && !(info->start_flags & STARTF_USESTDHANDLES))
{
/* duplicate the handle from the parent into this process */
req->hstdin = duplicate_handle( parent, info->hstdin, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
req->hstdout = duplicate_handle( parent, info->hstdout, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
req->hstderr = duplicate_handle( parent, info->hstderr, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
}
else
{
req->hstdin = info->hstdin;
req->hstdout = info->hstdout;
req->hstderr = info->hstderr;
}
}
else
{
/* no parent, use handles to the console for stdio */
req->hstdin = alloc_handle( process, process->console_in,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
req->hstdout = alloc_handle( process, process->console_out,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
req->hstderr = alloc_handle( process, process->console_out,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
}
/* some handles above may have been invalid; this is not an error */
if (get_error() == STATUS_INVALID_HANDLE) clear_error();
return 1;
}
/* create a new process and its main thread */
struct thread *create_process( int fd )
{
struct process *process;
struct thread *thread = NULL;
if (!(process = alloc_object( &process_ops, -1 )))
{
close( fd );
return NULL;
}
process->next = NULL;
process->prev = NULL;
process->thread_list = NULL;
process->debugger = NULL;
process->handles = NULL;
process->exit_code = STILL_ACTIVE;
process->running_threads = 0;
process->priority = NORMAL_PRIORITY_CLASS;
process->affinity = 1;
process->suspend = 0;
process->create_flags = 0;
process->console_in = NULL;
process->console_out = NULL;
process->init_event = NULL;
process->idle_event = NULL;
process->queue = NULL;
process->atom_table = NULL;
process->ldt_copy = NULL;
process->exe.next = NULL;
process->exe.prev = NULL;
process->exe.file = NULL;
process->exe.dbg_offset = 0;
process->exe.dbg_size = 0;
gettimeofday( &process->start_time, NULL );
if ((process->next = first_process) != NULL) process->next->prev = process;
first_process = process;
/* create the init done event */
if (!(process->init_event = create_event( NULL, 0, 1, 0 ))) goto error;
/* create the main thread */
if (!(thread = create_thread( fd, process ))) goto error;
release_object( process );
return thread;
error:
if (thread) release_object( thread );
release_object( process );
return NULL;
}
/* initialize the current process and fill in the request */
static void init_process( int ppid, struct init_process_request *req )
{
struct process *process = current->process;
struct thread *parent_thread = get_thread_from_pid( ppid );
struct process *parent = NULL;
struct startup_info *info = NULL;
if (parent_thread)
{
parent = parent_thread->process;
info = parent_thread->info;
if (!info)
{
fatal_protocol_error( current, "init_process: parent but no info\n" );
return;
}
if (info->thread)
{
fatal_protocol_error( current, "init_process: called twice?\n" );
return;
}
}
/* set the process flags */
process->create_flags = info ? info->create_flags : CREATE_NEW_CONSOLE;
/* create the handle table */
if (parent && info->inherit_all)
process->handles = copy_handle_table( process, parent );
else
process->handles = alloc_handle_table( process, 0 );
if (!process->handles) goto error;
/* retrieve the main exe file */
req->exe_file = 0;
if (parent && info->exe_file)
{
process->exe.file = (struct file *)grab_object( info->exe_file );
if (!(req->exe_file = alloc_handle( process, process->exe.file, GENERIC_READ, 0 )))
goto error;
}
/* set the process console */
if (!set_process_console( process, parent, info, req )) goto error;
if (parent)
{
/* attach to the debugger if requested */
if (process->create_flags & (DEBUG_PROCESS | DEBUG_ONLY_THIS_PROCESS))
set_process_debugger( process, parent_thread );
else if (parent && parent->debugger && !(parent->create_flags & DEBUG_ONLY_THIS_PROCESS))
set_process_debugger( process, parent->debugger );
}
/* thread will be actually suspended in init_done */
if (process->create_flags & CREATE_SUSPENDED) current->suspend++;
if (info)
{
size_t size = strlen(info->filename);
if (size > get_req_data_size(req)) size = get_req_data_size(req);
req->start_flags = info->start_flags;
req->cmd_show = info->cmd_show;
memcpy( get_req_data(req), info->filename, size );
set_req_data_size( req, size );
info->process = (struct process *)grab_object( process );
info->thread = (struct thread *)grab_object( current );
wake_up( &info->obj, 0 );
}
else
{
req->start_flags = STARTF_USESTDHANDLES;
req->cmd_show = 0;
set_req_data_size( req, 0 );
}
req->create_flags = process->create_flags;
req->server_start = server_start_ticks;
error:
}
/* destroy a process when its refcount is 0 */
static void process_destroy( struct object *obj )
{
struct process *process = (struct process *)obj;
assert( obj->ops == &process_ops );
/* we can't have a thread remaining */
assert( !process->thread_list );
if (process->next) process->next->prev = process->prev;
if (process->prev) process->prev->next = process->next;
else first_process = process->next;
if (process->init_event) release_object( process->init_event );
if (process->idle_event) release_object( process->idle_event );
if (process->queue) release_object( process->queue );
if (process->atom_table) release_object( process->atom_table );
if (process->exe.file) release_object( process->exe.file );
}
/* dump a process on stdout for debugging purposes */
static void process_dump( struct object *obj, int verbose )
{
struct process *process = (struct process *)obj;
assert( obj->ops == &process_ops );
fprintf( stderr, "Process next=%p prev=%p console=%p/%p handles=%p\n",
process->next, process->prev, process->console_in, process->console_out,
process->handles );
}
static int process_signaled( struct object *obj, struct thread *thread )
{
struct process *process = (struct process *)obj;
return !process->running_threads;
}
static void startup_info_destroy( struct object *obj )
{
struct startup_info *info = (struct startup_info *)obj;
assert( obj->ops == &startup_info_ops );
if (info->filename) free( info->filename );
if (info->exe_file) release_object( info->exe_file );
if (info->process) release_object( info->process );
if (info->thread) release_object( info->thread );
if (info->owner)
{
info->owner->info = NULL;
release_object( info->owner );
}
}
static void startup_info_dump( struct object *obj, int verbose )
{
struct startup_info *info = (struct startup_info *)obj;
assert( obj->ops == &startup_info_ops );
fprintf( stderr, "Startup info flags=%x in=%d out=%d err=%d name='%s'\n",
info->start_flags, info->hstdin, info->hstdout, info->hstderr, info->filename );
}
static int startup_info_signaled( struct object *obj, struct thread *thread )
{
struct startup_info *info = (struct startup_info *)obj;
return (info->thread != NULL);
}
/* get a process from an id (and increment the refcount) */
struct process *get_process_from_id( void *id )
{
struct process *p = first_process;
while (p && (p != id)) p = p->next;
if (p) grab_object( p );
else set_error( STATUS_INVALID_PARAMETER );
return p;
}
/* get a process from a handle (and increment the refcount) */
struct process *get_process_from_handle( handle_t handle, unsigned int access )
{
return (struct process *)get_handle_obj( current->process, handle,
access, &process_ops );
}
/* add a dll to a process list */
static struct process_dll *process_load_dll( struct process *process, struct file *file,
void *base )
{
struct process_dll *dll;
/* make sure we don't already have one with the same base address */
for (dll = process->exe.next; dll; dll = dll->next) if (dll->base == base)
{
set_error( STATUS_INVALID_PARAMETER );
return NULL;
}
if ((dll = mem_alloc( sizeof(*dll) )))
{
dll->prev = &process->exe;
dll->file = NULL;
dll->base = base;
if (file) dll->file = (struct file *)grab_object( file );
if ((dll->next = process->exe.next)) dll->next->prev = dll;
process->exe.next = dll;
}
return dll;
}
/* remove a dll from a process list */
static void process_unload_dll( struct process *process, void *base )
{
struct process_dll *dll;
for (dll = process->exe.next; dll; dll = dll->next)
{
if (dll->base == base)
{
if (dll->file) release_object( dll->file );
if (dll->next) dll->next->prev = dll->prev;
if (dll->prev) dll->prev->next = dll->next;
free( dll );
generate_debug_event( current, UNLOAD_DLL_DEBUG_EVENT, base );
return;
}
}
set_error( STATUS_INVALID_PARAMETER );
}
/* a process has been killed (i.e. its last thread died) */
static void process_killed( struct process *process )
{
assert( !process->thread_list );
gettimeofday( &process->end_time, NULL );
if (process->handles) release_object( process->handles );
process->handles = NULL;
free_console( process );
while (process->exe.next)
{
struct process_dll *dll = process->exe.next;
process->exe.next = dll->next;
if (dll->file) release_object( dll->file );
free( dll );
}
if (process->exe.file) release_object( process->exe.file );
process->exe.file = NULL;
wake_up( &process->obj, 0 );
if (!--running_processes)
{
/* last process died, close global handles */
close_global_handles();
/* this will cause the select loop to terminate */
if (!persistent_server) close_master_socket();
}
}
/* add a thread to a process running threads list */
void add_process_thread( struct process *process, struct thread *thread )
{
thread->proc_next = process->thread_list;
thread->proc_prev = NULL;
if (thread->proc_next) thread->proc_next->proc_prev = thread;
process->thread_list = thread;
if (!process->running_threads++) running_processes++;
grab_object( thread );
}
/* remove a thread from a process running threads list */
void remove_process_thread( struct process *process, struct thread *thread )
{
assert( process->running_threads > 0 );
assert( process->thread_list );
if (thread->proc_next) thread->proc_next->proc_prev = thread->proc_prev;
if (thread->proc_prev) thread->proc_prev->proc_next = thread->proc_next;
else process->thread_list = thread->proc_next;
if (!--process->running_threads)
{
/* we have removed the last running thread, exit the process */
process->exit_code = thread->exit_code;
generate_debug_event( thread, EXIT_PROCESS_DEBUG_EVENT, process );
process_killed( process );
}
else generate_debug_event( thread, EXIT_THREAD_DEBUG_EVENT, thread );
release_object( thread );
}
/* suspend all the threads of a process */
void suspend_process( struct process *process )
{
if (!process->suspend++)
{
struct thread *thread = process->thread_list;
for (; thread; thread = thread->proc_next)
{
if (!thread->suspend) stop_thread( thread );
}
}
}
/* resume all the threads of a process */
void resume_process( struct process *process )
{
assert (process->suspend > 0);
if (!--process->suspend)
{
struct thread *thread = process->thread_list;
for (; thread; thread = thread->proc_next)
{
if (!thread->suspend) continue_thread( thread );
}
}
}
/* kill a process on the spot */
static void kill_process( struct process *process, struct thread *skip, int exit_code )
{
struct thread *thread = process->thread_list;
while (thread)
{
struct thread *next = thread->proc_next;
thread->exit_code = exit_code;
if (thread != skip) kill_thread( thread, 1 );
thread = next;
}
}
/* kill all processes being debugged by a given thread */
void kill_debugged_processes( struct thread *debugger, int exit_code )
{
for (;;) /* restart from the beginning of the list every time */
{
struct process *process = first_process;
/* find the first process being debugged by 'debugger' and still running */
while (process && (process->debugger != debugger || !process->running_threads))
process = process->next;
if (!process) return;
process->debugger = NULL;
kill_process( process, NULL, exit_code );
}
}
/* get all information about a process */
static void get_process_info( struct process *process, struct get_process_info_request *req )
{
req->pid = process;
req->debugged = (process->debugger != 0);
req->exit_code = process->exit_code;
req->priority = process->priority;
req->process_affinity = process->affinity;
req->system_affinity = 1;
}
/* set all information about a process */
static void set_process_info( struct process *process,
struct set_process_info_request *req )
{
if (req->mask & SET_PROCESS_INFO_PRIORITY)
process->priority = req->priority;
if (req->mask & SET_PROCESS_INFO_AFFINITY)
{
if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
else process->affinity = req->affinity;
}
}
/* read data from a process memory space */
/* len is the total size (in ints), max is the size we can actually store in the output buffer */
/* we read the total size in all cases to check for permissions */
static void read_process_memory( struct process *process, const int *addr,
size_t len, size_t max, int *dest )
{
struct thread *thread = process->thread_list;
if ((unsigned int)addr % sizeof(int)) /* address must be aligned */
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!thread) /* process is dead */
{
set_error( STATUS_ACCESS_DENIED );
return;
}
if (suspend_for_ptrace( thread ))
{
while (len > 0 && max)
{
if (read_thread_int( thread, addr++, dest++ ) == -1) goto done;
max--;
len--;
}
/* check the rest for read permission */
if (len > 0)
{
int dummy, page = get_page_size() / sizeof(int);
while (len >= page)
{
addr += page;
len -= page;
if (read_thread_int( thread, addr - 1, &dummy ) == -1) goto done;
}
if (len && (read_thread_int( thread, addr + len - 1, &dummy ) == -1)) goto done;
}
done:
resume_thread( thread );
}
}
/* write data to a process memory space */
/* len is the total size (in ints), max is the size we can actually read from the input buffer */
/* we check the total size for write permissions */
static void write_process_memory( struct process *process, int *addr, size_t len,
size_t max, unsigned int first_mask,
unsigned int last_mask, const int *src )
{
struct thread *thread = process->thread_list;
if (!len || ((unsigned int)addr % sizeof(int))) /* address must be aligned */
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!thread) /* process is dead */
{
set_error( STATUS_ACCESS_DENIED );
return;
}
if (suspend_for_ptrace( thread ))
{
/* first word is special */
if (len > 1)
{
if (write_thread_int( thread, addr++, *src++, first_mask ) == -1) goto done;
len--;
max--;
}
else last_mask &= first_mask;
while (len > 1 && max)
{
if (write_thread_int( thread, addr++, *src++, ~0 ) == -1) goto done;
max--;
len--;
}
if (max)
{
/* last word is special too */
if (write_thread_int( thread, addr, *src, last_mask ) == -1) goto done;
}
else
{
/* check the rest for write permission */
int page = get_page_size() / sizeof(int);
while (len >= page)
{
addr += page;
len -= page;
if (write_thread_int( thread, addr - 1, 0, 0 ) == -1) goto done;
}
if (len && (write_thread_int( thread, addr + len - 1, 0, 0 ) == -1)) goto done;
}
done:
resume_thread( thread );
}
}
/* take a snapshot of currently running processes */
struct process_snapshot *process_snap( int *count )
{
struct process_snapshot *snapshot, *ptr;
struct process *process;
if (!running_processes) return NULL;
if (!(snapshot = mem_alloc( sizeof(*snapshot) * running_processes )))
return NULL;
ptr = snapshot;
for (process = first_process; process; process = process->next)
{
if (!process->running_threads) continue;
ptr->process = process;
ptr->threads = process->running_threads;
ptr->count = process->obj.refcount;
ptr->priority = process->priority;
grab_object( process );
ptr++;
}
*count = running_processes;
return snapshot;
}
/* take a snapshot of the modules of a process */
struct module_snapshot *module_snap( struct process *process, int *count )
{
struct module_snapshot *snapshot, *ptr;
struct process_dll *dll;
int total = 0;
for (dll = &process->exe; dll; dll = dll->next) total++;
if (!(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
for (ptr = snapshot, dll = &process->exe; dll; dll = dll->next, ptr++)
{
ptr->base = dll->base;
}
*count = total;
return snapshot;
}
/* create a new process */
DECL_HANDLER(new_process)
{
size_t len = get_req_data_size( req );
struct startup_info *info;
if (current->info)
{
fatal_protocol_error( current, "new_process: another process is being created\n" );
return;
}
/* build the startup info for a new process */
if (!(info = alloc_object( &startup_info_ops, -1 ))) return;
info->inherit_all = req->inherit_all;
info->create_flags = req->create_flags;
info->start_flags = req->start_flags;
info->hstdin = req->hstdin;
info->hstdout = req->hstdout;
info->hstderr = req->hstderr;
info->cmd_show = req->cmd_show;
info->exe_file = NULL;
info->filename = NULL;
info->owner = (struct thread *)grab_object( current );
info->process = NULL;
info->thread = NULL;
if (req->exe_file &&
!(info->exe_file = get_file_obj( current->process, req->exe_file, GENERIC_READ )))
goto done;
if (!(info->filename = mem_alloc( len + 1 ))) goto done;
memcpy( info->filename, get_req_data(req), len );
info->filename[len] = 0;
current->info = info;
req->info = alloc_handle( current->process, info, SYNCHRONIZE, FALSE );
done:
release_object( info );
}
/* Retrieve information about a newly started process */
DECL_HANDLER(get_new_process_info)
{
struct startup_info *info;
req->event = 0;
if ((info = (struct startup_info *)get_handle_obj( current->process, req->info,
0, &startup_info_ops )))
{
req->pid = get_process_id( info->process );
req->tid = get_thread_id( info->thread );
req->phandle = alloc_handle( current->process, info->process,
PROCESS_ALL_ACCESS, req->pinherit );
req->thandle = alloc_handle( current->process, info->thread,
THREAD_ALL_ACCESS, req->tinherit );
if (info->process->init_event)
req->event = alloc_handle( current->process, info->process->init_event,
EVENT_ALL_ACCESS, 0 );
release_object( info );
}
else
{
req->pid = 0;
req->tid = 0;
req->phandle = 0;
req->thandle = 0;
}
}
/* initialize a new process */
DECL_HANDLER(init_process)
{
if (!current->unix_pid)
{
fatal_protocol_error( current, "init_process: init_thread not called yet\n" );
return;
}
current->process->ldt_copy = req->ldt_copy;
init_process( req->ppid, req );
}
/* signal the end of the process initialization */
DECL_HANDLER(init_process_done)
{
struct file *file;
struct process *process = current->process;
if (!process->init_event)
{
fatal_protocol_error( current, "init_process_done: no event\n" );
return;
}
process->exe.base = req->module;
process->exe.name = req->name;
if (req->exe_file && (file = get_file_obj( current->process, req->exe_file, GENERIC_READ )))
{
if (process->exe.file) release_object( process->exe.file );
process->exe.file = file;
}
generate_startup_debug_events( current->process, req->entry );
set_event( process->init_event );
release_object( process->init_event );
process->init_event = NULL;
if (req->gui) process->idle_event = create_event( NULL, 0, 1, 0 );
if (current->suspend + current->process->suspend > 0) stop_thread( current );
req->debugged = (current->process->debugger != 0);
}
/* open a handle to a process */
DECL_HANDLER(open_process)
{
struct process *process = get_process_from_id( req->pid );
req->handle = 0;
if (process)
{
req->handle = alloc_handle( current->process, process, req->access, req->inherit );
release_object( process );
}
}
/* terminate a process */
DECL_HANDLER(terminate_process)
{
struct process *process;
if ((process = get_process_from_handle( req->handle, PROCESS_TERMINATE )))
{
req->self = (current->process == process);
kill_process( process, current, req->exit_code );
release_object( process );
}
}
/* fetch information about a process */
DECL_HANDLER(get_process_info)
{
struct process *process;
if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION )))
{
get_process_info( process, req );
release_object( process );
}
}
/* set information about a process */
DECL_HANDLER(set_process_info)
{
struct process *process;
if ((process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION )))
{
set_process_info( process, req );
release_object( process );
}
}
/* read data from a process address space */
DECL_HANDLER(read_process_memory)
{
struct process *process;
if ((process = get_process_from_handle( req->handle, PROCESS_VM_READ )))
{
size_t maxlen = get_req_data_size(req) / sizeof(int);
read_process_memory( process, req->addr, req->len, maxlen, get_req_data(req) );
release_object( process );
}
}
/* write data to a process address space */
DECL_HANDLER(write_process_memory)
{
struct process *process;
if ((process = get_process_from_handle( req->handle, PROCESS_VM_WRITE )))
{
size_t maxlen = get_req_data_size(req) / sizeof(int);
write_process_memory( process, req->addr, req->len, maxlen,
req->first_mask, req->last_mask, get_req_data(req) );
release_object( process );
}
}
/* notify the server that a dll has been loaded */
DECL_HANDLER(load_dll)
{
struct process_dll *dll;
struct file *file = NULL;
if (req->handle &&
!(file = get_file_obj( current->process, req->handle, GENERIC_READ ))) return;
if ((dll = process_load_dll( current->process, file, req->base )))
{
dll->dbg_offset = req->dbg_offset;
dll->dbg_size = req->dbg_size;
dll->name = req->name;
/* only generate event if initialization is done */
if (!current->process->init_event)
generate_debug_event( current, LOAD_DLL_DEBUG_EVENT, dll );
}
if (file) release_object( file );
}
/* notify the server that a dll is being unloaded */
DECL_HANDLER(unload_dll)
{
process_unload_dll( current->process, req->base );
}
/* wait for a process to start waiting on input */
/* FIXME: only returns event for now, wait is done in the client */
DECL_HANDLER(wait_input_idle)
{
struct process *process;
req->event = 0;
if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION )))
{
if (process->idle_event && process != current->process && process->queue != current->queue)
req->event = alloc_handle( current->process, process->idle_event,
EVENT_ALL_ACCESS, 0 );
release_object( process );
}
}
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