Sweden-Number/server/process.c

637 lines
20 KiB
C

/*
* Server-side process management
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <unistd.h>
#include "winerror.h"
#include "winbase.h"
#include "winnt.h"
#include "server.h"
#include "server/process.h"
#include "server/thread.h"
/* reserved handle access rights */
#define RESERVED_SHIFT 25
#define RESERVED_INHERIT (HANDLE_FLAG_INHERIT << RESERVED_SHIFT)
#define RESERVED_CLOSE_PROTECT (HANDLE_FLAG_PROTECT_FROM_CLOSE << RESERVED_SHIFT)
#define RESERVED_ALL (RESERVED_INHERIT | RESERVED_CLOSE_PROTECT)
/* global handle macros */
#define HANDLE_OBFUSCATOR 0x544a4def
#define HANDLE_IS_GLOBAL(h) (((h) ^ HANDLE_OBFUSCATOR) < 0x10000)
#define HANDLE_LOCAL_TO_GLOBAL(h) ((h) ^ HANDLE_OBFUSCATOR)
#define HANDLE_GLOBAL_TO_LOCAL(h) ((h) ^ HANDLE_OBFUSCATOR)
struct handle_entry
{
struct object *ptr;
unsigned int access;
};
/* process structure */
struct process
{
struct object obj; /* object header */
struct process *next; /* system-wide process list */
struct process *prev;
struct thread *thread_list; /* head of the thread list */
struct handle_entry *entries; /* handle entry table */
int handle_count; /* nb of allocated handle entries */
int handle_last; /* last used handle entry */
int exit_code; /* process exit code */
int running_threads; /* number of threads running in this process */
struct timeval start_time; /* absolute time at process start */
struct timeval end_time; /* absolute time at process end */
int priority; /* priority class */
int affinity; /* process affinity mask */
struct object *console_in; /* console input */
struct object *console_out; /* console output */
struct new_process_request *info; /* startup info (freed after startup) */
};
static struct process initial_process;
static struct process *first_process = &initial_process;
static int running_processes;
#define MIN_HANDLE_ENTRIES 32
/* 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 void free_handles( struct process *process );
static int copy_handle_table( struct process *process, struct process *parent );
static const struct object_ops process_ops =
{
process_dump,
add_queue,
remove_queue,
process_signaled,
no_satisfied,
no_read_fd,
no_write_fd,
no_flush,
no_get_file_info,
process_destroy
};
/* initialization of a process structure */
static void init_process( struct process *process )
{
init_object( &process->obj, &process_ops, NULL );
process->next = NULL;
process->prev = NULL;
process->thread_list = NULL;
process->exit_code = 0x103; /* STILL_ACTIVE */
process->running_threads = 0;
process->priority = NORMAL_PRIORITY_CLASS;
process->affinity = 1;
process->console_in = NULL;
process->console_out = NULL;
process->info = NULL;
gettimeofday( &process->start_time, NULL );
/* alloc a handle for the process itself */
alloc_handle( process, process, PROCESS_ALL_ACCESS, 0 );
}
/* create the initial process */
struct process *create_initial_process(void)
{
struct new_process_request *info;
copy_handle_table( &initial_process, NULL );
init_process( &initial_process );
if (!alloc_console( &initial_process )) return NULL;
if (!(info = mem_alloc( sizeof(*info) ))) return NULL;
info->start_flags = STARTF_USESTDHANDLES;
info->hstdin = alloc_handle( &initial_process, initial_process.console_in,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
info->hstdout = alloc_handle( &initial_process, initial_process.console_out,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
info->hstderr = alloc_handle( &initial_process, initial_process.console_out,
GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 1 );
info->env_ptr = NULL;
initial_process.info = info;
grab_object( &initial_process ); /* so that we never free it */
return &initial_process;
}
/* create a new process */
struct process *create_process( struct new_process_request *req )
{
struct process *process = NULL;
struct process *parent = current->process;
if (!(process = mem_alloc( sizeof(*process) ))) return NULL;
if (!copy_handle_table( process, req->inherit_all ? parent : NULL ))
{
free( process );
return NULL;
}
init_process( 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 (!(process->info = mem_alloc( sizeof(*process->info) ))) goto error;
memcpy( process->info, req, sizeof(*req) );
if (!req->inherit_all && !(req->start_flags & STARTF_USESTDHANDLES))
{
process->info->hstdin = duplicate_handle( parent, req->hstdin, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
process->info->hstdout = duplicate_handle( parent, req->hstdout, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
process->info->hstderr = duplicate_handle( parent, req->hstderr, process,
0, TRUE, DUPLICATE_SAME_ACCESS );
}
process->next = first_process;
first_process->prev = process;
first_process = process;
return process;
error:
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 );
assert( process != &initial_process );
/* 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;
free_console( process );
free_handles( process );
if (process->info) free( process->info );
if (debug_level) memset( process, 0xbb, sizeof(process) ); /* catch errors */
free( process );
}
/* 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 );
printf( "Process next=%p prev=%p\n", process->next, process->prev );
}
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( ERROR_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 );
}
/* retrieve the initialization info for a new process */
int get_process_init_info( struct process *process, struct init_process_reply *reply )
{
struct new_process_request *info;
if (!(info = process->info)) return 0;
process->info = NULL;
reply->start_flags = info->start_flags;
reply->hstdin = info->hstdin;
reply->hstdout = info->hstdout;
reply->hstderr = info->hstderr;
reply->env_ptr = info->env_ptr;
free( info );
return 1;
}
/* 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 );
wake_up( &process->obj, 0 );
free_handles( process );
}
/* free the process handle entries */
static void free_handles( struct process *process )
{
struct handle_entry *entry;
int handle;
if (!(entry = process->entries)) return;
for (handle = 0; handle <= process->handle_last; handle++, entry++)
{
struct object *obj = entry->ptr;
entry->ptr = NULL;
if (obj) release_object( obj );
}
free( process->entries );
process->handle_count = 0;
process->handle_last = -1;
process->entries = NULL;
}
/* 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 */
running_processes--;
process_killed( process, thread->exit_code );
}
release_object( thread );
}
/* grow a handle table */
/* return 1 if OK, 0 on error */
static int grow_handle_table( struct process *process )
{
struct handle_entry *new_entries;
int count = process->handle_count;
if (count >= INT_MAX / 2) return 0;
count *= 2;
if (!(new_entries = realloc( process->entries, count * sizeof(struct handle_entry) )))
{
SET_ERROR( ERROR_OUTOFMEMORY );
return 0;
}
process->handle_count = count;
process->entries = new_entries;
return 1;
}
/* allocate a handle for an object, incrementing its refcount */
/* return the handle, or -1 on error */
int alloc_handle( struct process *process, void *obj, unsigned int access,
int inherit )
{
struct handle_entry *entry;
int handle;
assert( !(access & RESERVED_ALL) );
if (inherit) access |= RESERVED_INHERIT;
/* find the first free entry */
if (!(entry = process->entries)) return -1;
for (handle = 0; handle <= process->handle_last; handle++, entry++)
if (!entry->ptr) goto found;
if (handle >= process->handle_count)
{
if (!grow_handle_table( process )) return -1;
entry = process->entries + handle; /* the table may have moved */
}
process->handle_last = handle;
found:
entry->ptr = grab_object( obj );
entry->access = access;
return handle + 1; /* avoid handle 0 */
}
/* return an handle entry, or NULL if the handle is invalid */
static struct handle_entry *get_handle( struct process *process, int handle )
{
struct handle_entry *entry;
if (HANDLE_IS_GLOBAL(handle))
{
handle = HANDLE_GLOBAL_TO_LOCAL(handle);
process = &initial_process;
}
handle--; /* handles start at 1 */
if ((handle < 0) || (handle > process->handle_last)) goto error;
entry = process->entries + handle;
if (!entry->ptr) goto error;
return entry;
error:
SET_ERROR( ERROR_INVALID_HANDLE );
return NULL;
}
/* attempt to shrink a table */
/* return 1 if OK, 0 on error */
static int shrink_handle_table( struct process *process )
{
struct handle_entry *new_entries;
struct handle_entry *entry = process->entries + process->handle_last;
int count = process->handle_count;
while (process->handle_last >= 0)
{
if (entry->ptr) break;
process->handle_last--;
entry--;
}
if (process->handle_last >= count / 4) return 1; /* no need to shrink */
if (count < MIN_HANDLE_ENTRIES * 2) return 1; /* too small to shrink */
count /= 2;
if (!(new_entries = realloc( process->entries,
count * sizeof(struct handle_entry) )))
return 0;
process->handle_count = count;
process->entries = new_entries;
return 1;
}
/* copy the handle table of the parent process */
/* return 1 if OK, 0 on error */
static int copy_handle_table( struct process *process, struct process *parent )
{
struct handle_entry *ptr;
int i, count, last;
if (!parent) /* first process */
{
count = MIN_HANDLE_ENTRIES;
last = -1;
}
else
{
assert( parent->entries );
count = parent->handle_count;
last = parent->handle_last;
}
if (!(ptr = mem_alloc( count * sizeof(struct handle_entry)))) return 0;
process->entries = ptr;
process->handle_count = count;
process->handle_last = last;
if (last >= 0)
{
memcpy( ptr, parent->entries, (last + 1) * sizeof(struct handle_entry) );
for (i = 0; i <= last; i++, ptr++)
{
if (!ptr->ptr) continue;
if (ptr->access & RESERVED_INHERIT) grab_object( ptr->ptr );
else ptr->ptr = NULL; /* don't inherit this entry */
}
}
/* attempt to shrink the table */
shrink_handle_table( process );
return 1;
}
/* close a handle and decrement the refcount of the associated object */
/* return 1 if OK, 0 on error */
int close_handle( struct process *process, int handle )
{
struct handle_entry *entry;
struct object *obj;
if (HANDLE_IS_GLOBAL(handle))
{
handle = HANDLE_GLOBAL_TO_LOCAL(handle);
process = &initial_process;
}
if (!(entry = get_handle( process, handle ))) return 0;
if (entry->access & RESERVED_CLOSE_PROTECT) return 0; /* FIXME: error code */
obj = entry->ptr;
entry->ptr = NULL;
if (handle-1 == process->handle_last) shrink_handle_table( process );
release_object( obj );
return 1;
}
/* retrieve the object corresponding to a handle, incrementing its refcount */
struct object *get_handle_obj( struct process *process, int handle,
unsigned int access, const struct object_ops *ops )
{
struct handle_entry *entry;
struct object *obj;
switch( handle )
{
case 0xfffffffe: /* current thread pseudo-handle */
obj = &current->obj;
break;
case 0x7fffffff: /* current process pseudo-handle */
obj = (struct object *)current->process;
break;
default:
if (!(entry = get_handle( process, handle ))) return NULL;
if ((entry->access & access) != access)
{
SET_ERROR( ERROR_ACCESS_DENIED );
return NULL;
}
obj = entry->ptr;
break;
}
if (ops && (obj->ops != ops))
{
SET_ERROR( ERROR_INVALID_HANDLE ); /* not the right type */
return NULL;
}
return grab_object( obj );
}
/* get/set the handle reserved flags */
/* return the new flags (or -1 on error) */
int set_handle_info( struct process *process, int handle, int mask, int flags )
{
struct handle_entry *entry;
if (!(entry = get_handle( process, handle ))) return -1;
mask = (mask << RESERVED_SHIFT) & RESERVED_ALL;
flags = (flags << RESERVED_SHIFT) & mask;
entry->access = (entry->access & ~mask) | flags;
return (entry->access & RESERVED_ALL) >> RESERVED_SHIFT;
}
/* duplicate a handle */
int duplicate_handle( struct process *src, int src_handle, struct process *dst,
unsigned int access, int inherit, int options )
{
int res;
struct handle_entry *entry = get_handle( src, src_handle );
if (!entry) return -1;
if (options & DUP_HANDLE_SAME_ACCESS) access = entry->access;
if (options & DUP_HANDLE_MAKE_GLOBAL) dst = &initial_process;
access &= ~RESERVED_ALL;
res = alloc_handle( dst, entry->ptr, access, inherit );
if (options & DUP_HANDLE_MAKE_GLOBAL) res = HANDLE_LOCAL_TO_GLOBAL(res);
return res;
}
/* open a new handle to an existing object */
int open_object( const char *name, const struct object_ops *ops,
unsigned int access, int inherit )
{
struct object *obj = find_object( name );
if (!obj)
{
SET_ERROR( ERROR_FILE_NOT_FOUND );
return -1;
}
if (ops && obj->ops != ops)
{
release_object( obj );
SET_ERROR( ERROR_INVALID_HANDLE ); /* FIXME: not the right type */
return -1;
}
return alloc_handle( current->process, obj, access, inherit );
}
/* dump a handle table on stdout */
void dump_handles( struct process *process )
{
struct handle_entry *entry;
int i;
if (!process->entries) return;
entry = process->entries;
for (i = 0; i <= process->handle_last; i++, entry++)
{
if (!entry->ptr) continue;
printf( "%5d: %p %08x ", i + 1, entry->ptr, entry->access );
entry->ptr->ops->dump( entry->ptr, 0 );
}
}
/* 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 );
}
/* get all information about a process */
void get_process_info( struct process *process,
struct get_process_info_reply *reply )
{
reply->pid = process;
reply->exit_code = process->exit_code;
reply->priority = process->priority;
reply->process_affinity = process->affinity;
reply->system_affinity = 1;
}
/* set all information about a process */
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( ERROR_INVALID_PARAMETER );
else process->affinity = req->affinity;
}
}
/* allocate a console for this process */
int alloc_console( struct process *process )
{
struct object *obj[2];
if (process->console_in || process->console_out)
{
SET_ERROR( ERROR_ACCESS_DENIED );
return 0;
}
if (!create_console( -1, obj )) return 0;
process->console_in = obj[0];
process->console_out = obj[1];
return 1;
}
/* free the console for this process */
int free_console( struct process *process )
{
if (process->console_in) release_object( process->console_in );
if (process->console_out) release_object( process->console_out );
process->console_in = process->console_out = NULL;
return 1;
}
/* get the process console */
struct object *get_console( struct process *process, int output )
{
struct object *obj;
if (!(obj = output ? process->console_out : process->console_in))
return NULL;
return grab_object( obj );
}
/* 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;
}