Sweden-Number/server/process.c

666 lines
21 KiB
C

/*
* 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_read_fd, /* get_read_fd */
no_write_fd, /* get_write_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
process_destroy /* destroy */
};
/* set the process creation info */
static int set_creation_info( struct process *process, struct new_process_request *req,
const char *cmd_line, size_t len )
{
if (!(process->info = mem_alloc( sizeof(*process->info) + len ))) return 0;
if (req)
{
/* copy the request structure */
memcpy( process->info, req, sizeof(*req) );
}
else /* no request, use defaults */
{
req = process->info;
req->inherit = 0;
req->inherit_all = 0;
req->create_flags = CREATE_NEW_CONSOLE;
req->start_flags = STARTF_USESTDHANDLES;
req->exe_file = -1;
req->hstdin = -1;
req->hstdout = -1;
req->hstderr = -1;
req->event = -1;
req->cmd_show = 0;
req->env_ptr = NULL;
}
memcpy( process->info->cmdline, cmd_line, len );
process->info->cmdline[len] = 0;
process->create_flags = process->info->create_flags;
return 1;
}
/* set the console and stdio handles for a newly created process */
static int set_process_console( struct process *process, struct process *parent )
{
struct new_process_request *info = process->info;
if (process->create_flags & CREATE_NEW_CONSOLE)
{
if (!alloc_console( process )) return 0;
}
else if (!(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 */
info->hstdin = duplicate_handle( parent, info->hstdin, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
info->hstdout = duplicate_handle( parent, info->hstdout, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
info->hstderr = duplicate_handle( parent, info->hstderr, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
}
}
else
{
/* no parent, use handles to the console for stdio */
info->hstdin = alloc_handle( process, process->console_in,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
info->hstdout = alloc_handle( process, process->console_out,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
info->hstderr = alloc_handle( process, process->console_out,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
}
return 1;
}
/* create a new process and its main thread */
struct thread *create_process( int fd, struct process *parent,
struct new_process_request *req,
const char *cmd_line, size_t len )
{
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->exe_file = 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->info = NULL;
process->ldt_copy = NULL;
process->ldt_flags = NULL;
gettimeofday( &process->start_time, NULL );
if ((process->next = first_process) != NULL) process->next->prev = process;
first_process = process;
/* copy the request structure */
if (!set_creation_info( process, req, cmd_line, len )) goto error;
if (process->info->inherit_all)
process->handles = copy_handle_table( process, parent );
else
process->handles = alloc_handle_table( process, 0 );
if (!process->handles) goto error;
/* alloc a handle for the process itself */
alloc_handle( process, process, PROCESS_ALL_ACCESS, 0 );
/* retrieve the main exe file */
if (process->info->exe_file != -1)
{
if (!(process->exe_file = get_file_obj( parent, process->info->exe_file,
GENERIC_READ ))) goto error;
process->info->exe_file = -1;
}
/* get the init done event */
if (process->info->event != -1)
{
if (!(process->init_event = get_event_obj( parent, process->info->event,
EVENT_MODIFY_STATE ))) goto error;
}
/* set the process console */
if (!set_process_console( process, parent )) goto error;
/* create the main thread */
if (!(thread = create_thread( fd, process, (process->create_flags & CREATE_SUSPENDED) != 0)))
goto error;
/* attach to the debugger if requested */
if (process->create_flags & (DEBUG_PROCESS | DEBUG_ONLY_THIS_PROCESS))
debugger_attach( process, current );
else if (parent && parent->debugger && !(parent->create_flags & DEBUG_ONLY_THIS_PROCESS))
debugger_attach( process, parent->debugger );
release_object( process );
return thread;
error:
close( fd );
free_console( process );
if (process->handles) release_object( process->handles );
release_object( process );
return NULL;
}
/* 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->info) free( process->info );
if (process->init_event) release_object( process->init_event );
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;
}
/* 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( int handle, unsigned int access )
{
return (struct process *)get_handle_obj( current->process, handle,
access, &process_ops );
}
/* a process has been killed (i.e. its last thread died) */
static void process_killed( struct process *process, int exit_code )
{
assert( !process->thread_list );
process->exit_code = exit_code;
gettimeofday( &process->end_time, NULL );
release_object( process->handles );
process->handles = NULL;
free_console( process );
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_killed( process, thread->exit_code );
}
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 */
void kill_process( struct process *process, int exit_code )
{
while (process->thread_list)
kill_thread( process->thread_list, exit_code );
}
/* 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, 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->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;
}
suspend_thread( thread, 0 );
if (thread->attached)
{
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;
}
}
else set_error( STATUS_ACCESS_DENIED );
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;
}
suspend_thread( thread, 0 );
if (thread->attached)
{
/* 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;
}
}
else set_error( STATUS_ACCESS_DENIED );
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->priority = process->priority;
grab_object( process );
ptr++;
}
*count = running_processes;
return snapshot;
}
/* create a new process */
DECL_HANDLER(new_process)
{
size_t len = get_req_strlen( req->cmdline );
struct thread *thread;
int sock[2];
req->phandle = -1;
req->thandle = -1;
req->pid = NULL;
req->tid = NULL;
if (socketpair( AF_UNIX, SOCK_STREAM, 0, sock ) == -1)
{
file_set_error();
return;
}
if ((thread = create_process( sock[0], current->process, req, req->cmdline, len )))
{
int phandle = alloc_handle( current->process, thread->process,
PROCESS_ALL_ACCESS, req->inherit );
if ((req->phandle = phandle) != -1)
{
if ((req->thandle = alloc_handle( current->process, thread,
THREAD_ALL_ACCESS, req->inherit )) != -1)
{
/* thread object will be released when the thread gets killed */
set_reply_fd( current, sock[1] );
req->pid = thread->process;
req->tid = thread;
return;
}
close_handle( current->process, phandle );
}
release_object( thread );
}
close( sock[1] );
}
/* initialize a new process */
DECL_HANDLER(init_process)
{
struct new_process_request *info;
if (!current->unix_pid)
{
fatal_protocol_error( current, "init_process: init_thread not called yet\n" );
return;
}
if (!(info = current->process->info))
{
fatal_protocol_error( current, "init_process: called twice\n" );
return;
}
current->process->ldt_copy = req->ldt_copy;
current->process->ldt_flags = req->ldt_flags;
current->process->info = NULL;
req->exe_file = -1;
req->start_flags = info->start_flags;
req->hstdin = info->hstdin;
req->hstdout = info->hstdout;
req->hstderr = info->hstderr;
req->cmd_show = info->cmd_show;
req->env_ptr = info->env_ptr;
strcpy( req->cmdline, info->cmdline );
if (current->process->exe_file)
req->exe_file = alloc_handle( current->process, current->process->exe_file,
GENERIC_READ, 0 );
free( info );
}
/* signal the end of the process initialization */
DECL_HANDLER(init_process_done)
{
struct process *process = current->process;
if (!process->init_event)
{
fatal_protocol_error( current, "init_process_done: no event\n" );
return;
}
set_event( process->init_event );
release_object( process->init_event );
process->init_event = NULL;
if (current->suspend + current->process->suspend > 0) stop_thread( current );
}
/* open a handle to a process */
DECL_HANDLER(open_process)
{
struct process *process = get_process_from_id( req->pid );
req->handle = -1;
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 )))
{
kill_process( process, 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 )))
{
read_process_memory( process, req->addr, req->len,
get_req_size( req->data, sizeof(int) ), req->data );
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 )))
{
write_process_memory( process, req->addr, req->len, get_req_size( req->data, sizeof(int) ),
req->first_mask, req->last_mask, req->data );
release_object( process );
}
}