/*
 * processes.c:  Process handles
 *
 * Author:
 *	Dick Porter (dick@ximian.com)
 *
 * (C) 2002-2006 Novell, 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 */
	NULL				/* prewait */	
};

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);
}

static gboolean process_set_termination_details (gpointer handle, int status)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	int thr_ret;
	
	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(FALSE);
	}
	
	thr_ret = _wapi_handle_lock_shared_handles ();
	g_assert (thr_ret == 0);

	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);
	
#ifdef DEBUG
	g_message ("%s: Setting handle %p signalled", __func__, handle);
#endif

	_wapi_shared_handle_set_signal_state (handle, TRUE);

	_wapi_handle_unlock_shared_handles ();

	/* Drop the reference we hold so we have somewhere to store
	 * the exit details, now the process has in fact exited
	 */
	_wapi_handle_unref (handle);
	
	return (ok);
}

/* See if any child processes have terminated and wait() for them,
 * updating process handle info.  This function is called from the
 * collection thread every few seconds.
 */
static gboolean waitfor_pid (gpointer test, gpointer user_data)
{
	struct _WapiHandle_process *process;
	gboolean ok;
	int status;
	pid_t ret;
	
	if (_wapi_handle_issignalled (test)) {
		/* We've already done this one */
		return (FALSE);
	}
	
	ok = _wapi_lookup_handle (test, WAPI_HANDLE_PROCESS,
				  (gpointer *)&process);
	if (ok == FALSE) {
		/* The handle must have been too old and was reaped */
		return (FALSE);
	}
	
	do {
		ret = waitpid (process->id, &status, WNOHANG);
	} while (errno == EINTR);
	
	if (ret <= 0) {
		/* Process not ready for wait */
#ifdef DEBUG
		g_message ("%s: Process %d not ready for waiting for: %s",
			   __func__, process->id, g_strerror (errno));
#endif

		return (FALSE);
	}
	
#ifdef DEBUG
	g_message ("%s: Process %d finished", __func__, ret);
#endif

	*(int *)user_data = status;
	
	return (TRUE);
}

void _wapi_process_reap (void)
{
	gpointer proc;
	int status;
	
#ifdef DEBUG
	g_message ("%s: Reaping child processes", __func__);
#endif

	do {
		proc = _wapi_search_handle (WAPI_HANDLE_PROCESS, waitfor_pid,
					    &status, NULL, FALSE);
		if (proc != NULL) {
#ifdef DEBUG
			g_message ("%s: process handle %p exit code %d",
				   __func__, proc, status);
#endif
			
			process_set_termination_details (proc, status);

			/* _wapi_search_handle adds a reference, so
			 * drop it here
			 */
			_wapi_handle_unref (proc);
		}
	} while (proc != NULL);
}

/* 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 _WapiHandle_process *process_handle;
	gboolean ok;
	pid_t pid, ret;
	int status;
	
#ifdef DEBUG
	g_message ("%s: Waiting for process %p", __func__, handle);
#endif
	
	if (_wapi_handle_issignalled (handle)) {
		/* We've already done this one */
#ifdef DEBUG
		g_message ("%s: Process %p already signalled", __func__,
			   handle);
#endif

		return (WAIT_OBJECT_0);
	}

	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, timeout %d", __func__, pid, timeout);
#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, status %d", __func__, status);
#endif

	ok = process_set_termination_details (handle, status);
	if (ok == FALSE) {
		SetLastError (ERROR_OUTOFMEMORY);
		return (WAIT_FAILED);
	}

	return(WAIT_OBJECT_0);
}

void _wapi_process_signal_self ()
{
	if (current_process != NULL) {
		process_set_termination_details (current_process, 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);
}

static int
len16 (const gunichar2 *str)
{
	int len = 0;
	
	while (*str++ != 0)
		len++;

	return len;
}

static gunichar2 *
utf16_concat (const gunichar2 *first, ...)
{
	va_list args;
	int total = 0, i;
	const gunichar2 *s;
	gunichar2 *ret;

	va_start (args, first);
	total += len16 (first);
        for (s = va_arg (args, gunichar2 *); s != NULL; s = va_arg(args, gunichar2 *)){
		total += len16 (s);
        }
	va_end (args);

	ret = g_new (gunichar2, total + 1);
	if (ret == NULL)
		return NULL;

	ret [total] = 0;
	i = 0;
	for (s = first; *s != 0; s++)
		ret [i++] = *s;
	va_start (args, first);
	for (s = va_arg (args, gunichar2 *); s != NULL; s = va_arg (args, gunichar2 *)){
		const gunichar2 *p;
		
		for (p = s; *p != 0; p++)
			ret [i++] = *p;
	}
	va_end (args);
	
	return ret;
}

static const gunichar2 utf16_space_bytes [2] = { 0x20, 0 };
static const gunichar2 *utf16_space = utf16_space_bytes; 

/* Implemented as just a wrapper around CreateProcess () */
gboolean ShellExecuteEx (WapiShellExecuteInfo *sei)
{
	gboolean ret;
	WapiProcessInformation process_info;
	gunichar2 *args;
	
	if (sei == NULL) {
		/* w2k just segfaults here, but we can do better than
		 * that
		 */
		SetLastError (ERROR_INVALID_PARAMETER);
		return (FALSE);
	}

	if (sei->lpFile == NULL) {
		/* w2k returns TRUE for this, for some reason. */
		return (TRUE);
	}
	
	/* Put both executable and parameters into the second argument
	 * to CreateProcess (), so it searches $PATH.  The conversion
	 * into and back out of utf8 is because there is no
	 * g_strdup_printf () equivalent for gunichar2 :-(
	 */
	args = utf16_concat (sei->lpFile, sei->lpParameters == NULL ? NULL : utf16_space, sei->lpParameters, NULL);
	if (args == NULL){
		SetLastError (ERROR_INVALID_DATA);
		return (FALSE);
	}
	ret = CreateProcess (NULL, args, NULL, NULL, TRUE,
			     CREATE_UNICODE_ENVIRONMENT, NULL,
			     sei->lpDirectory, NULL, &process_info);
	g_free (args);
	
	if (!ret) {
		static char *handler;
		static gunichar2 *handler_utf16;
		
		if (handler_utf16 == (gunichar2 *)-1)
			return FALSE;

#ifdef PLATFORM_MACOSX
		handler = "/usr/bin/open";
#else
		/*
		 * On Linux, try: xdg-open, the FreeDesktop standard way of doing it,
		 * if that fails, try to use gnome-open, then kfmclient
		 */
		handler = g_find_program_in_path ("xdg-open");
		if (handler == NULL){
			handler = g_find_program_in_path ("gnome-open");
			if (handler == NULL){
				handler = g_find_program_in_path ("kfmclient");
				if (handler == NULL){
					handler_utf16 = (gunichar2 *) -1;
					return (FALSE);
				} else {
					/* kfmclient needs exec argument */
					char *old = handler;
					handler = g_strconcat (old, " exec",
							       NULL);
					g_free (old);
				}
			}
		}
#endif
		handler_utf16 = g_utf8_to_utf16 (handler, -1, NULL, NULL, NULL);
		g_free (handler);
		args = utf16_concat (handler_utf16, utf16_space, sei->lpFile,
				     sei->lpParameters == NULL ? NULL : utf16_space,
				     sei->lpParameters, NULL);
		if (args == NULL){
			SetLastError (ERROR_INVALID_DATA);
			return FALSE;
		}
		ret = CreateProcess (NULL, args, NULL, NULL, TRUE,
				     CREATE_UNICODE_ENVIRONMENT, NULL,
				     sei->lpDirectory, NULL, &process_info);
		g_free (args);
		if (!ret){
			SetLastError (ERROR_INVALID_DATA);
			return FALSE;
		}
	}
	
	if (sei->fMask & SEE_MASK_NOCLOSEPROCESS) {
		sei->hProcess = process_info.hProcess;
	} else {
		CloseHandle (process_info.hProcess);
	}
	
	return (ret);
}

gboolean CreateProcess (const gunichar2 *appname, const 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 _WapiHandle_process process_handle = {0}, *process_handle_data;
	GError *gerr = NULL;
	int in_fd, out_fd, err_fd;
	pid_t pid;
	int thr_ret;
	
	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] = '/';
			}
		}
	}
	

	/* 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);

			/* And make sure it's executable */
			if (access (prog, X_OK) != 0) {
#ifdef DEBUG
				g_message ("%s: Couldn't find executable %s",
					   __func__, prog);
#endif
				g_free (prog);
				SetLastError (ERROR_FILE_NOT_FOUND);
				goto cleanup;
			}
		}

		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,
		   _WAPI_PROC_NAME_MAX_LEN - 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;
	}

	/* Hold another reference so the process has somewhere to
	 * store its exit data even if we drop this handle
	 */
	_wapi_handle_ref (handle);
	
	/* 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);
	}

	thr_ret = _wapi_handle_lock_shared_handles ();
	g_assert (thr_ret == 0);
	
	pid = fork ();
	if (pid == -1) {
		/* Error */
		SetLastError (ERROR_OUTOFMEMORY);
		_wapi_handle_unref (handle);
		goto cleanup;
	} else if (pid == 0) {
		/* Child */
		
		/* Wait for the parent to finish setting up the
		 * handle.  The semaphore lock is safe because the
		 * sem_undo structures of a semaphore aren't inherited
		 * across a fork ()
		 */
		thr_ret = _wapi_handle_lock_shared_handles ();
		g_assert (thr_ret == 0);
	
		_wapi_handle_unlock_shared_handles ();
		
		/* 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==NULL?".":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 (dir != NULL && chdir (dir) == -1) {
			/* set error */
			_exit (-1);
		}
		
		/* exec */
		execve (argv[0], argv, env_strings);
		
		/* set error */
		_exit (-1);
	}
	/* parent */
	
	ret = _wapi_lookup_handle (handle, WAPI_HANDLE_PROCESS,
				   (gpointer *)&process_handle_data);
	if (ret == FALSE) {
		g_warning ("%s: error looking up process handle %p", __func__,
			   handle);
		_wapi_handle_unref (handle);
		goto cleanup;
	}
	
	process_handle_data->id = pid;
	
	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 = INVALID_HANDLE_VALUE;
		process_info->dwThreadId = 0;
	}

cleanup:
	_wapi_handle_unlock_shared_handles ();

	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,
				   _WAPI_PROC_NAME_MAX_LEN - 1);
		} else {
			g_strlcpy (process_handle->proc_name, utf8_progname,
				   _WAPI_PROC_NAME_MAX_LEN - 1);
		}

		g_free (utf8_progname);
	}
}

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

#if !GLIB_CHECK_VERSION (2,4,0)
#define g_setenv(a,b,c) setenv(a,b,c)
#define g_unsetenv(a) unsetenv(a)
#endif

static void process_set_current (void)
{
	pid_t pid = _wapi_getpid ();
	const char *handle_env;
	struct _WapiHandle_process process_handle = {0};
	
	handle_env = g_getenv ("_WAPI_PROCESS_HANDLE_OFFSET");
	g_unsetenv ("_WAPI_PROCESS_HANDLE_OFFSET");
	
	if (handle_env != NULL) {
		struct _WapiHandle_process *process_handlep;
		gchar *procname = NULL;
		gboolean ok;
		
		current_process = _wapi_handle_new_from_offset (WAPI_HANDLE_PROCESS, atoi (handle_env), TRUE);
		
#ifdef DEBUG
		g_message ("%s: Found my process handle: %p (offset %d 0x%x)",
			   __func__, current_process, atoi (handle_env),
			   atoi (handle_env));
#endif

		ok = _wapi_lookup_handle (current_process, WAPI_HANDLE_PROCESS,
					  (gpointer *)&process_handlep);
		if (ok) {
			/* This test will probably break on linuxthreads, but
			 * that should be ancient history on all distros we
			 * care about by now
			 */
			if (process_handlep->id == pid) {
				procname = process_handlep->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_handlep);
				} else {
#ifdef DEBUG
					g_message ("%s: Leaving process name: %s", __func__, procname);
#endif
				}

				return;
			}

			/* Wrong pid, so drop this handle and fall through to
			 * create a new one
			 */
			_wapi_handle_unref (current_process);
		}
	}

	/* We get here if the handle wasn't specified in the
	 * environment, or if the process ID was wrong, or if the
	 * handle lookup failed (eg if the parent process forked and
	 * quit immediately, and deleted the shared data before the
	 * child got a chance to attach it.)
	 */

#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;
	}
}

gpointer _wapi_process_duplicate ()
{
	mono_once (&process_current_once, process_set_current);
	
	_wapi_handle_ref (current_process);
	
	return(current_process);
}

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

guint32 GetProcessId (gpointer handle)
{
	struct _WapiHandle_process *process_handle;
	gboolean ok;
	
	ok = _wapi_lookup_handle (handle, WAPI_HANDLE_PROCESS,
				  (gpointer *)&process_handle);
	if (ok == FALSE) {
		SetLastError (ERROR_INVALID_HANDLE);
		return (0);
	}
	
	return (process_handle->id);
}

guint32 GetCurrentProcessId (void)
{
	mono_once (&process_current_once, process_set_current);
		
	return (GetProcessId (current_process));
}

/* 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) {
		/* It's possible that the handle has vanished during
		 * the _wapi_search_handle before it gets here, so
		 * don't spam the console with warnings.
		 */
/*		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, TRUE);
	
	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) {
		/* If the handle is blown away in the window between
		 * returning TRUE here and _wapi_search_handle pinging
		 * the timestamp, the search will continue
		 */
		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, TRUE);
	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
	 * and has been waited for */
	if (_wapi_handle_issignalled (process) == TRUE ||
	    process_wait (process, 0) == WAIT_OBJECT_0) {
		*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;
		gchar *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);
}