/*
 * processes.c:  Process handles
 *
 * Author:
 *	Dick Porter (dick@ximian.com)
 *
 * (C) 2002 Ximian, Inc.
 */

#include <config.h>
#include <glib.h>
#include <string.h>
#include <pthread.h>
#include <sched.h>
#include <sys/time.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>

#include <mono/io-layer/wapi.h>
#include <mono/io-layer/wapi-private.h>
#include <mono/io-layer/handles-private.h>
#include <mono/io-layer/misc-private.h>
#include <mono/io-layer/mono-mutex.h>
#include <mono/io-layer/process-private.h>
#include <mono/io-layer/threads.h>
#include <mono/utils/strenc.h>
#include <mono/io-layer/timefuncs-private.h>

/* The process' environment strings */
extern char **environ;

#undef DEBUG

static guint32 process_wait (gpointer handle, guint32 timeout);

struct _WapiHandleOps _wapi_process_ops = {
	NULL,				/* close_shared */
	NULL,				/* signal */
	NULL,				/* own */
	NULL,				/* is_owned */
	process_wait			/* special_wait */
};

static mono_once_t process_current_once=MONO_ONCE_INIT;
static gpointer current_process=NULL;

static mono_once_t process_ops_once=MONO_ONCE_INIT;

static void process_ops_init (void)
{
	_wapi_handle_register_capabilities (WAPI_HANDLE_PROCESS,
					    WAPI_HANDLE_CAP_WAIT |
					    WAPI_HANDLE_CAP_SPECIAL_WAIT);
}

/* Limitations: This can only wait for processes that are our own
 * children.  Fixing this means resurrecting a daemon helper to manage
 * processes.
 */
static guint32 process_wait (gpointer handle, guint32 timeout)
{
	struct _WapiHandleShared shared_handle;
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	pid_t pid, ret;
	int status;
	
#ifdef DEBUG
	g_message ("%s: Waiting for process %p", __func__, handle);
#endif

	ok = _wapi_lookup_handle (handle, WAPI_HANDLE_PROCESS,
				  (gpointer *)&process_handle);
	if (ok == FALSE) {
		g_warning ("%s: error looking up process handle %p", __func__,
			   handle);
		return(WAIT_FAILED);
	}
	
	pid = process_handle->id;
	
#ifdef DEBUG
	g_message ("%s: PID is %d", __func__, pid);
#endif

	if (timeout == INFINITE) {
		while ((ret = waitpid (pid, &status, 0)) != pid) {
			if (ret == (pid_t)-1 && errno != EINTR) {
				return(WAIT_FAILED);
			}
		}
	} else if (timeout == 0) {
		/* Just poll */
		ret = waitpid (pid, &status, WNOHANG);
		if (ret != pid) {
			return (WAIT_TIMEOUT);
		}
	} else {
		/* Poll in a loop */
		do {
			ret = waitpid (pid, &status, WNOHANG);
			if (ret == pid) {
				break;
			} else if (ret == (pid_t)-1 && errno != EINTR) {
				return(WAIT_FAILED);
			}

			_wapi_handle_spin (100);
			timeout -= 100;
		} while (timeout > 0);

		if (timeout <= 0) {
			return(WAIT_TIMEOUT);
		}
	}

	/* Process must have exited */
#ifdef DEBUG
	g_message ("%s: Wait done", __func__);
#endif

	ok = _wapi_copy_handle (handle, WAPI_HANDLE_PROCESS, &shared_handle);
	if (ok == FALSE) {
		g_warning ("%s: error looking up process handle %p",
			   __func__, handle);
		return(WAIT_FAILED);
	}
	
	process_handle = &shared_handle.u.process;

	if (WIFSIGNALED(status)) {
		process_handle->exitstatus = 128 + WTERMSIG(status);
	} else {
		process_handle->exitstatus = WEXITSTATUS(status);
	}
	_wapi_time_t_to_filetime (time(NULL), &process_handle->exit_time);
	
	ok = _wapi_replace_handle (handle, WAPI_HANDLE_PROCESS,
				   &shared_handle);
	if (ok == FALSE) {
		SetLastError (ERROR_OUTOFMEMORY);
		return (WAIT_FAILED);
	}
	
	_wapi_shared_handle_set_signal_state (handle, TRUE);

	return(WAIT_OBJECT_0);
}
	
static void process_set_defaults (struct _WapiHandle_process *process_handle)
{
	/* These seem to be the defaults on w2k */
	process_handle->min_working_set = 204800;
	process_handle->max_working_set = 1413120;

	_wapi_time_t_to_filetime (time (NULL), &process_handle->create_time);
}

gboolean CreateProcess (const gunichar2 *appname, gunichar2 *cmdline,
			WapiSecurityAttributes *process_attrs G_GNUC_UNUSED,
			WapiSecurityAttributes *thread_attrs G_GNUC_UNUSED,
			gboolean inherit_handles, guint32 create_flags,
			gpointer new_environ, const gunichar2 *cwd,
			WapiStartupInfo *startup,
			WapiProcessInformation *process_info)
{
	gchar *cmd=NULL, *prog = NULL, *full_prog = NULL, *args = NULL, *args_after_prog = NULL, *dir = NULL, **env_strings = NULL, **argv;
	guint32 i, env_count = 0;
	gboolean ret = FALSE;
	gpointer handle;
	struct _WapiHandleShared shared_handle;
	struct _WapiHandle_process process_handle = {0};
	GError *gerr = NULL;
	int in_fd, out_fd, err_fd;
	pid_t pid;
	
	mono_once (&process_ops_once, process_ops_init);
	
	/* appname and cmdline specify the executable and its args:
	 *
	 * If appname is not NULL, it is the name of the executable.
	 * Otherwise the executable is the first token in cmdline.
	 *
	 * Executable searching:
	 *
	 * If appname is not NULL, it can specify the full path and
	 * file name, or else a partial name and the current directory
	 * will be used.  There is no additional searching.
	 *
	 * If appname is NULL, the first whitespace-delimited token in
	 * cmdline is used.  If the name does not contain a full
	 * directory path, the search sequence is:
	 *
	 * 1) The directory containing the current process
	 * 2) The current working directory
	 * 3) The windows system directory  (Ignored)
	 * 4) The windows directory (Ignored)
	 * 5) $PATH
	 *
	 * Just to make things more interesting, tokens can contain
	 * white space if they are surrounded by quotation marks.  I'm
	 * beginning to understand just why windows apps are generally
	 * so crap, with an API like this :-(
	 */
	if (appname != NULL) {
		cmd = mono_unicode_to_external (appname);
		if (cmd == NULL) {
#ifdef DEBUG
			g_message ("%s: unicode conversion returned NULL",
				   __func__);
#endif

			SetLastError (ERROR_PATH_NOT_FOUND);
			goto cleanup;
		}

		/* Turn all the slashes round the right way */
		for (i = 0; i < strlen (cmd); i++) {
			if (cmd[i] == '\\') {
				cmd[i] = '/';
			}
		}
	}
	
	if (cmdline != NULL) {
		args = mono_unicode_to_external (cmdline);
		if (args == NULL) {
#ifdef DEBUG
			g_message ("%s: unicode conversion returned NULL", __func__);
#endif

			SetLastError (ERROR_PATH_NOT_FOUND);
			goto cleanup;
		}
	}

	if (cwd != NULL) {
		dir = mono_unicode_to_external (cwd);
		if (dir == NULL) {
#ifdef DEBUG
			g_message ("%s: unicode conversion returned NULL", __func__);
#endif

			SetLastError (ERROR_PATH_NOT_FOUND);
			goto cleanup;
		}

		/* Turn all the slashes round the right way */
		for (i = 0; i < strlen (dir); i++) {
			if (dir[i] == '\\') {
				dir[i] = '/';
			}
		}
	} else {
		dir = g_get_current_dir ();
	}
	

	/* We can't put off locating the executable any longer :-( */
	if (cmd != NULL) {
		gchar *unquoted;
		if (g_ascii_isalpha (cmd[0]) && (cmd[1] == ':')) {
			/* Strip off the drive letter.  I can't
			 * believe that CP/M holdover is still
			 * visible...
			 */
			g_memmove (cmd, cmd+2, strlen (cmd)-2);
			cmd[strlen (cmd)-2] = '\0';
		}

		unquoted = g_shell_unquote (cmd, NULL);
		if (unquoted[0] == '/') {
			/* Assume full path given */
			prog = g_strdup (unquoted);

			/* Executable existing ? */
			if (access (prog, X_OK) != 0) {
#ifdef DEBUG
				g_message ("%s: Couldn't find executable %s",
					   __func__, prog);
#endif
				g_free (prog);
				g_free (unquoted);
				SetLastError (ERROR_FILE_NOT_FOUND);
				goto cleanup;
			}
		} else {
			/* Search for file named by cmd in the current
			 * directory
			 */
			char *curdir = g_get_current_dir ();

			prog = g_strdup_printf ("%s/%s", curdir, unquoted);
			g_free (unquoted);
			g_free (curdir);
		}

		args_after_prog = args;
	} else {
		gchar *token = NULL;
		char quote;
		
		/* Dig out the first token from args, taking quotation
		 * marks into account
		 */

		/* First, strip off all leading whitespace */
		args = g_strchug (args);
		
		/* args_after_prog points to the contents of args
		 * after token has been set (otherwise argv[0] is
		 * duplicated)
		 */
		args_after_prog = args;

		/* Assume the opening quote will always be the first
		 * character
		 */
		if (args[0] == '\"' || args [0] == '\'') {
			quote = args [0];
			for (i = 1; args[i] != '\0' && args[i] != quote; i++);
			if (g_ascii_isspace (args[i+1])) {
				/* We found the first token */
				token = g_strndup (args+1, i-1);
				args_after_prog = args + i;
			} else {
				/* Quotation mark appeared in the
				 * middle of the token.  Just give the
				 * whole first token, quotes and all,
				 * to exec.
				 */
			}
		}
		
		if (token == NULL) {
			/* No quote mark, or malformed */
			for (i = 0; args[i] != '\0'; i++) {
				if (g_ascii_isspace (args[i])) {
					token = g_strndup (args, i);
					args_after_prog = args + i + 1;
					break;
				}
			}
		}

		if (token == NULL && args[0] != '\0') {
			/* Must be just one token in the string */
			token = g_strdup (args);
			args_after_prog = NULL;
		}
		
		if (token == NULL) {
			/* Give up */
#ifdef DEBUG
			g_message ("%s: Couldn't find what to exec", __func__);
#endif

			SetLastError (ERROR_PATH_NOT_FOUND);
			goto cleanup;
		}
		
		/* Turn all the slashes round the right way. Only for
		 * the prg. name
		 */
		for (i = 0; i < strlen (token); i++) {
			if (token[i] == '\\') {
				token[i] = '/';
			}
		}

		if (g_ascii_isalpha (token[0]) && (token[1] == ':')) {
			/* Strip off the drive letter.  I can't
			 * believe that CP/M holdover is still
			 * visible...
			 */
			g_memmove (token, token+2, strlen (token)-2);
			token[strlen (token)-2] = '\0';
		}

		if (token[0] == '/') {
			/* Assume full path given */
			prog = g_strdup (token);
			
			/* Executable existing ? */
			if (access (prog, X_OK) != 0) {
				g_free (prog);
#ifdef DEBUG
				g_message ("%s: Couldn't find executable %s",
					   __func__, token);
#endif
				g_free (token);
				SetLastError (ERROR_FILE_NOT_FOUND);
				goto cleanup;
			}

		} else {
			char *curdir = g_get_current_dir ();

			/* FIXME: Need to record the directory
			 * containing the current process, and check
			 * that for the new executable as the first
			 * place to look
			 */

			prog = g_strdup_printf ("%s/%s", curdir, token);
			g_free (curdir);

			/* I assume X_OK is the criterion to use,
			 * rather than F_OK
			 */
			if (access (prog, X_OK) != 0) {
				g_free (prog);
				prog = g_find_program_in_path (token);
				if (prog == NULL) {
#ifdef DEBUG
					g_message ("%s: Couldn't find executable %s", __func__, token);
#endif

					g_free (token);
					SetLastError (ERROR_FILE_NOT_FOUND);
					goto cleanup;
				}
			}
		}

		g_free (token);
	}

#ifdef DEBUG
	g_message ("%s: Exec prog [%s] args [%s]", __func__, prog,
		   args_after_prog);
#endif
	
	if (args_after_prog != NULL && *args_after_prog) {
		gchar *qprog;

		qprog = g_shell_quote (prog);
		full_prog = g_strconcat (qprog, " ", args_after_prog, NULL);
		g_free (qprog);
	} else {
		full_prog = g_shell_quote (prog);
	}

	ret = g_shell_parse_argv (full_prog, NULL, &argv, &gerr);
	if (ret == FALSE) {
		/* FIXME: Could do something with the GError here
		 */
	}

	if (startup != NULL && startup->dwFlags & STARTF_USESTDHANDLES) {
		in_fd = GPOINTER_TO_UINT (startup->hStdInput);
		out_fd = GPOINTER_TO_UINT (startup->hStdOutput);
		err_fd = GPOINTER_TO_UINT (startup->hStdError);
	} else {
		in_fd = GPOINTER_TO_UINT (GetStdHandle (STD_INPUT_HANDLE));
		out_fd = GPOINTER_TO_UINT (GetStdHandle (STD_OUTPUT_HANDLE));
		err_fd = GPOINTER_TO_UINT (GetStdHandle (STD_ERROR_HANDLE));
	}
	
	g_strlcpy (process_handle.proc_name, prog, _POSIX_PATH_MAX-1);

	process_set_defaults (&process_handle);
	
	handle = _wapi_handle_new (WAPI_HANDLE_PROCESS, &process_handle);
	if (handle == _WAPI_HANDLE_INVALID) {
		g_warning ("%s: error creating process handle", __func__);

		SetLastError (ERROR_PATH_NOT_FOUND);
		goto cleanup;
	}
	
	/* new_environ is a block of NULL-terminated strings, which
	 * is itself NULL-terminated. Of course, passing an array of
	 * string pointers would have made things too easy :-(
	 *
	 * If new_environ is not NULL it specifies the entire set of
	 * environment variables in the new process.  Otherwise the
	 * new process inherits the same environment.
	 */
	if (new_environ != NULL) {
		gunichar2 *new_environp;

		/* Count the number of strings */
		for (new_environp = (gunichar2 *)new_environ; *new_environp;
		     new_environp++) {
			env_count++;
			while (*new_environp) {
				new_environp++;
			}
		}

		/* +2: one for the process handle value, and the last
		 * one is NULL
		 */
		env_strings = g_new0 (gchar *, env_count + 2);
		
		/* Copy each environ string into 'strings' turning it
		 * into utf8 (or the requested encoding) at the same
		 * time
		 */
		env_count = 0;
		for (new_environp = (gunichar2 *)new_environ; *new_environp;
		     new_environp++) {
			env_strings[env_count] = mono_unicode_to_external (new_environp);
			env_count++;
			while (*new_environp) {
				new_environp++;
			}
		}
	} else {
		for (i = 0; environ[i] != NULL; i++) {
			env_count++;
		}

		/* +2: one for the process handle value, and the last
		 * one is NULL
		 */
		env_strings = g_new0 (gchar *, env_count + 2);
		
		/* Copy each environ string into 'strings' turning it
		 * into utf8 (or the requested encoding) at the same
		 * time
		 */
		env_count = 0;
		for (i = 0; environ[i] != NULL; i++) {
			env_strings[env_count] = g_strdup (environ[i]);
			env_count++;
		}
	}
	/* pass process handle info to the child, so it doesn't have
	 * to do an expensive search over the whole list
	 */
	if (env_strings != NULL) {
		struct _WapiHandleUnshared *handle_data;
		struct _WapiHandle_shared_ref *ref;
		
		handle_data = &_WAPI_PRIVATE_HANDLES(GPOINTER_TO_UINT(handle));
		ref = &handle_data->u.shared;
		
		env_strings[env_count] = g_strdup_printf ("_WAPI_PROCESS_HANDLE_OFFSET=%d", ref->offset);
	}
	
	pid = fork ();
	if (pid == -1) {
		/* Error */
	} else if (pid == 0) {
		/* Child */

		/* should we detach from the process group? */

		/* Connect stdin, stdout and stderr */
		dup2 (in_fd, 0);
		dup2 (out_fd, 1);
		dup2 (err_fd, 2);

		if (inherit_handles != TRUE) {
			/* FIXME: do something here */
		}
		
		/* Close all file descriptors */
		for (i = getdtablesize () - 1; i > 2; i--) {
			close (i);
		}

#ifdef DEBUG
		g_message ("%s: exec()ing [%s] in dir [%s]", __func__, cmd,
			   dir);
		for (i = 0; argv[i] != NULL; i++) {
			g_message ("arg %d: [%s]", i, argv[i]);
		}
		
		for (i = 0; env_strings[i] != NULL; i++) {
			g_message ("env %d: [%s]", i, env_strings[i]);
		}
#endif

		/* set cwd */
		if (chdir (dir) == -1) {
			/* set error */
			exit (-1);
		}
		
		/* exec */
		execve (argv[0], argv, env_strings);
		
		/* set error */
		exit (-1);
	}
	/* parent */

	ret = _wapi_copy_handle (handle, WAPI_HANDLE_PROCESS, &shared_handle);
	if (ret == FALSE) {
		g_warning ("%s: error copying process handle %p", __func__,
			   handle);
		_wapi_handle_unref (handle);
		goto cleanup;
	}
	
	shared_handle.u.process.id = pid;

	ret = _wapi_replace_handle (handle, WAPI_HANDLE_PROCESS,
				    &shared_handle);
	if (ret == FALSE) {
		SetLastError (ERROR_OUTOFMEMORY);
		_wapi_handle_unref (handle);
		goto cleanup;
	}
	
	if (process_info != NULL) {
		process_info->hProcess = handle;
		process_info->dwProcessId = pid;

		/* FIXME: we might need to handle the thread info some
		 * day
		 */
		process_info->hThread = NULL;
		process_info->dwThreadId = 0;
	}

cleanup:
	if (cmd != NULL) {
		g_free (cmd);
	}
	if (full_prog != NULL) {
		g_free (prog);
	}
	if (args != NULL) {
		g_free (args);
	}
	if (dir != NULL) {
		g_free (dir);
	}
	if(env_strings != NULL) {
		g_strfreev (env_strings);
	}
	
	return(ret);
}
		
static void process_set_name (struct _WapiHandle_process *process_handle)
{
	gchar *progname, *utf8_progname, *slash;
	
	progname=g_get_prgname ();
	utf8_progname=mono_utf8_from_external (progname);

#ifdef DEBUG
	g_message ("%s: using [%s] as prog name", __func__, progname);
#endif

	if(utf8_progname!=NULL) {
		slash=strrchr (utf8_progname, '/');
		if(slash!=NULL) {
			g_strlcpy (process_handle->proc_name, slash+1,
				   _POSIX_PATH_MAX-1);
		} else {
			g_strlcpy (process_handle->proc_name, utf8_progname,
				   _POSIX_PATH_MAX-1);
		}

		g_free (utf8_progname);
	}
}

extern void _wapi_time_t_to_filetime (time_t timeval, WapiFileTime *filetime);

static void process_set_current (void)
{
	pid_t pid = getpid ();
	char *handle_env;
	
	handle_env = getenv ("_WAPI_PROCESS_HANDLE_OFFSET");
	if (handle_env == NULL) {
		struct _WapiHandle_process process_handle = {0};

#ifdef DEBUG
		g_message ("%s: Need to create my own process handle",
			   __func__);
#endif

		process_handle.id = pid;

		process_set_defaults (&process_handle);
		process_set_name (&process_handle);

		current_process = _wapi_handle_new (WAPI_HANDLE_PROCESS,
						    &process_handle);
		if (current_process == _WAPI_HANDLE_INVALID) {
			g_warning ("%s: error creating process handle",
				   __func__);
			return;
		}
		
		/* Make sure the new handle has a reference so it wont go away
		 * until this process exits
		 */
		_wapi_handle_ref (current_process);
	} else {
		struct _WapiHandle_process *process_handle;
		guchar *procname = NULL;
		gboolean ok;
		
		current_process = _wapi_handle_new_from_offset (WAPI_HANDLE_PROCESS, atoi (handle_env));
		
#ifdef DEBUG
		g_message ("%s: Found my process handle: %p (offset %d)",
			   __func__, current_process, atoi (handle_env));
#endif

		ok = _wapi_lookup_handle (current_process, WAPI_HANDLE_PROCESS,
					  (gpointer *)&process_handle);
		if (ok == FALSE) {
			g_warning ("%s: error looking up process handle %p",
				   __func__, current_process);
			return;
		}

		procname = process_handle->proc_name;
		if (!strcmp (procname, "mono")) {
			/* Set a better process name */
#ifdef DEBUG
			g_message ("%s: Setting better process name",
				   __func__);
#endif

			process_set_name (process_handle);
		} else {
#ifdef DEBUG
			g_message ("%s: Leaving process name: %s", __func__,
				   procname);
#endif
		}
	}
}

/* Returns a pseudo handle that doesn't need to be closed afterwards */
gpointer GetCurrentProcess (void)
{
	mono_once (&process_current_once, process_set_current);
		
	return((gpointer)-1);
}

guint32 GetCurrentProcessId (void)
{
	struct _WapiHandle_process *current_process_handle;
	gboolean ok;
	
	mono_once (&process_current_once, process_set_current);
		
	ok=_wapi_lookup_handle (current_process, WAPI_HANDLE_PROCESS,
				(gpointer *)&current_process_handle);
	if(ok==FALSE) {
		g_warning ("%s: error looking up current process handle %p",
			   __func__, current_process);
		/* No failure return is defined.  PID 0 is invalid.
		 * This should only be reached when something else has
		 * gone badly wrong anyway.
		 */
		return(0);
	}
	
	return(current_process_handle->id);
}

/* Returns the process id as a convenience to the functions that call this */
static pid_t signal_process_if_gone (gpointer handle)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	
	/* Make sure the process is signalled if it has exited - if
	 * the parent process didn't wait for it then it won't be
	 */
	ok = _wapi_lookup_handle (handle, WAPI_HANDLE_PROCESS,
				  (gpointer *)&process_handle);
	if (ok == FALSE) {
		g_warning ("%s: error looking up process handle %p",
			   __func__, handle);
		
		return (0);
	}
	
#ifdef DEBUG
	g_message ("%s: looking at process %d", __func__, process_handle->id);
#endif

	if (kill (process_handle->id, 0) == -1 &&
	    (errno == ESRCH ||
	     errno == EPERM)) {
		/* The process is dead, (EPERM tells us a new process
		 * has that ID, but as it's owned by someone else it
		 * can't be the one listed in our shared memory file)
		 */
		_wapi_shared_handle_set_signal_state (handle, TRUE);
	}

	return (process_handle->id);
}

static gboolean process_enum (gpointer handle, gpointer user_data)
{
	GArray *processes=user_data;
	pid_t pid = signal_process_if_gone (handle);
	int i;
	
	if (pid == 0) {
		return (FALSE);
	}
	
	/* Ignore processes that have already exited (ie they are signalled) */
	if (_wapi_handle_issignalled (handle) == FALSE) {
#ifdef DEBUG
		g_message ("%s: process %d added to array", __func__, pid);
#endif

		/* This ensures that duplicates aren't returned (see
		 * the comment above _wapi_search_handle () for why
		 * it's needed
		 */
		for (i = 0; i < processes->len; i++) {
			if (g_array_index (processes, pid_t, i) == pid) {
				/* We've already got this one, return
				 * FALSE to keep searching
				 */
				return (FALSE);
			}
		}
		
		g_array_append_val (processes, pid);
	}
	
	/* Return false to keep searching */
	return(FALSE);
}

gboolean EnumProcesses (guint32 *pids, guint32 len, guint32 *needed)
{
	GArray *processes = g_array_new (FALSE, FALSE, sizeof(pid_t));
	guint32 fit, i, j;
	
	mono_once (&process_current_once, process_set_current);
	
	_wapi_search_handle (WAPI_HANDLE_PROCESS, process_enum, processes,
			     NULL);
	
	fit=len/sizeof(guint32);
	for (i = 0, j = 0; j < fit && i < processes->len; i++) {
		pids[j++] = g_array_index (processes, pid_t, i);
	}

	g_array_free (processes, TRUE);
	
	*needed = j * sizeof(guint32);
	
	return(TRUE);
}

static gboolean process_open_compare (gpointer handle, gpointer user_data)
{
	pid_t wanted_pid;
	pid_t checking_pid = signal_process_if_gone (handle);

	if (checking_pid == 0) {
		return(FALSE);
	}
	
	wanted_pid = GPOINTER_TO_UINT (user_data);

	/* It's possible to have more than one process handle with the
	 * same pid, but only the one running process can be
	 * unsignalled
	 */
	if (checking_pid == wanted_pid &&
	    _wapi_handle_issignalled (handle) == FALSE) {
		return(TRUE);
	} else {
		return(FALSE);
	}
}

gpointer OpenProcess (guint32 access G_GNUC_UNUSED, gboolean inherit G_GNUC_UNUSED, guint32 pid)
{
	/* Find the process handle that corresponds to pid */
	gpointer handle;
	
	mono_once (&process_current_once, process_set_current);

#ifdef DEBUG
	g_message ("%s: looking for process %d", __func__, pid);
#endif

	handle = _wapi_search_handle (WAPI_HANDLE_PROCESS,
				      process_open_compare,
				      GUINT_TO_POINTER (pid), NULL);
	if (handle == 0) {
#ifdef DEBUG
		g_message ("%s: Can't find pid %d", __func__, pid);
#endif

		SetLastError (ERROR_PROC_NOT_FOUND);
	
		return(NULL);
	}

	_wapi_handle_ref (handle);
	
	return(handle);
}

gboolean GetExitCodeProcess (gpointer process, guint32 *code)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	
	mono_once (&process_current_once, process_set_current);

	if(code==NULL) {
		return(FALSE);
	}
	
	ok=_wapi_lookup_handle (process, WAPI_HANDLE_PROCESS,
				(gpointer *)&process_handle);
	if(ok==FALSE) {
#ifdef DEBUG
		g_message ("%s: Can't find process %p", __func__, process);
#endif
		
		return(FALSE);
	}
	
	/* A process handle is only signalled if the process has exited */
	if(_wapi_handle_issignalled (process)==TRUE) {
		*code=process_handle->exitstatus;
	} else {
		*code=STILL_ACTIVE;
	}
	
	return(TRUE);
}

gboolean GetProcessTimes (gpointer process, WapiFileTime *create_time,
			  WapiFileTime *exit_time, WapiFileTime *kernel_time,
			  WapiFileTime *user_time)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	
	mono_once (&process_current_once, process_set_current);

	if(create_time==NULL || exit_time==NULL || kernel_time==NULL ||
	   user_time==NULL) {
		/* Not sure if w32 allows NULLs here or not */
		return(FALSE);
	}
	
	ok=_wapi_lookup_handle (process, WAPI_HANDLE_PROCESS,
				(gpointer *)&process_handle);
	if(ok==FALSE) {
#ifdef DEBUG
		g_message ("%s: Can't find process %p", __func__, process);
#endif
		
		return(FALSE);
	}
	
	*create_time=process_handle->create_time;

	/* A process handle is only signalled if the process has
	 * exited.  Otherwise exit_time isn't set
	 */
	if(_wapi_handle_issignalled (process)==TRUE) {
		*exit_time=process_handle->exit_time;
	}
	
	return(TRUE);
}

gboolean EnumProcessModules (gpointer process, gpointer *modules,
			     guint32 size, guint32 *needed)
{
	/* Store modules in an array of pointers (main module as
	 * modules[0]), using the load address for each module as a
	 * token.  (Use 'NULL' as an alternative for the main module
	 * so that the simple implementation can just return one item
	 * for now.)  Get the info from /proc/<pid>/maps on linux,
	 * other systems will have to implement /dev/kmem reading or
	 * whatever other horrid technique is needed.
	 */
	if(size<sizeof(gpointer)) {
		return(FALSE);
	}
	
#ifdef linux
	modules[0]=NULL;
	*needed=sizeof(gpointer);
#else
	modules[0]=NULL;
	*needed=sizeof(gpointer);
#endif
	
	return(TRUE);
}

guint32 GetModuleBaseName (gpointer process, gpointer module,
			   gunichar2 *basename, guint32 size)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	
	mono_once (&process_current_once, process_set_current);

#ifdef DEBUG
	g_message ("%s: Getting module base name, process handle %p module %p",
		   __func__, process, module);
#endif

	if(basename==NULL || size==0) {
		return(FALSE);
	}
	
	ok=_wapi_lookup_handle (process, WAPI_HANDLE_PROCESS,
				(gpointer *)&process_handle);
	if(ok==FALSE) {
#ifdef DEBUG
		g_message ("%s: Can't find process %p", __func__, process);
#endif
		
		return(FALSE);
	}

	if(module==NULL) {
		/* Shorthand for the main module, which has the
		 * process name recorded in the handle data
		 */
		pid_t pid;
		gunichar2 *procname;
		guchar *procname_utf8 = NULL;
		glong len, bytes;
		
#ifdef DEBUG
		g_message ("%s: Returning main module name", __func__);
#endif

		pid=process_handle->id;
		procname_utf8 = process_handle->proc_name;
	
#ifdef DEBUG
		g_message ("%s: Process name is [%s]", __func__,
			   procname_utf8);
#endif

		procname = g_utf8_to_utf16 (procname_utf8, -1, NULL, &len,
					    NULL);
		if (procname == NULL) {
			/* bugger */
			return(0);
		}

		/* Add the terminator, and convert chars to bytes */
		bytes = (len + 1) * 2;
		
		if (size < bytes) {
#ifdef DEBUG
			g_message ("%s: Size %d smaller than needed (%ld); truncating", __func__, size, bytes);
#endif

			memcpy (basename, procname, size);
		} else {
#ifdef DEBUG
			g_message ("%s: Size %d larger than needed (%ld)",
				   __func__, size, bytes);
#endif

			memcpy (basename, procname, bytes);
		}
		
		g_free (procname);

		return(len);
	} else {
		/* Look up the address in /proc/<pid>/maps */
	}
	
	return(0);
}

gboolean GetProcessWorkingSetSize (gpointer process, size_t *min, size_t *max)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	
	mono_once (&process_current_once, process_set_current);

	if(min==NULL || max==NULL) {
		/* Not sure if w32 allows NULLs here or not */
		return(FALSE);
	}
	
	ok=_wapi_lookup_handle (process, WAPI_HANDLE_PROCESS,
				(gpointer *)&process_handle);
	if(ok==FALSE) {
#ifdef DEBUG
		g_message ("%s: Can't find process %p", __func__, process);
#endif
		
		return(FALSE);
	}

	*min=process_handle->min_working_set;
	*max=process_handle->max_working_set;
	
	return(TRUE);
}

gboolean SetProcessWorkingSetSize (gpointer process, size_t min, size_t max)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;

	mono_once (&process_current_once, process_set_current);

	ok=_wapi_lookup_handle (process, WAPI_HANDLE_PROCESS,
				(gpointer *)&process_handle);
	if(ok==FALSE) {
#ifdef DEBUG
		g_message ("%s: Can't find process %p", __func__, process);
#endif
		
		return(FALSE);
	}

	process_handle->min_working_set=min;
	process_handle->max_working_set=max;
	
	return(TRUE);
}


gboolean
TerminateProcess (gpointer process, gint32 exitCode)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	int signo;
	int ret;

	ok = _wapi_lookup_handle (process, WAPI_HANDLE_PROCESS,
				  (gpointer *) &process_handle);

	if (ok == FALSE) {
#ifdef DEBUG
		g_message ("%s: Can't find process %p", __func__, process);
#endif
		SetLastError (ERROR_INVALID_HANDLE);
		return FALSE;
	}

	signo = (exitCode == -1) ? SIGKILL : SIGTERM;
	ret = kill (process_handle->id, signo);
	if (ret == -1) {
		switch (errno) {
		case EINVAL:
			SetLastError (ERROR_INVALID_PARAMETER);
			break;
		case EPERM:
			SetLastError (ERROR_ACCESS_DENIED);
			break;
		case ESRCH:
			SetLastError (ERROR_PROC_NOT_FOUND);
			break;
		default:
			SetLastError (ERROR_GEN_FAILURE);
		}
	}
	
	return (ret == 0);
}