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gimp/app/plug-in/gimpplugin.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <gtk/gtk.h>
#if defined(G_OS_WIN32) || defined(G_WITH_CYGWIN)
#define STRICT
#include <windows.h>
#include <process.h>
#ifdef G_OS_WIN32
#include <fcntl.h>
#include <io.h>
#endif
#ifdef G_WITH_CYGWIN
#define O_TEXT 0x0100 /* text file */
#define _O_TEXT 0x0100 /* text file */
#define O_BINARY 0x0200 /* binary file */
#define _O_BINARY 0x0200 /* binary file */
#endif
#endif /* G_OS_WIN32 || G_WITH_CYGWIN */
#ifdef __EMX__
#include <fcntl.h>
#include <process.h>
#define _O_BINARY O_BINARY
#define _P_NOWAIT P_NOWAIT
#endif
#ifdef HAVE_IPC_H
#include <sys/ipc.h>
#endif
#ifdef HAVE_SHM_H
#include <sys/shm.h>
#endif
#include "libgimpbase/gimpbase.h"
#include "libgimpbase/gimpprotocol.h"
#include "libgimpbase/gimpwire.h"
#include "plug-in-types.h"
#include "base/tile.h"
#include "base/tile-manager.h"
#include "core/gimp.h"
#include "core/gimpenvirontable.h"
#include "gui/brush-select.h"
#include "gui/gradient-select.h"
#include "gui/palette-select.h"
#include "gui/pattern-select.h"
#include "plug-in.h"
#include "plug-ins.h"
#include "plug-in-def.h"
#include "plug-in-message.h"
#include "plug-in-params.h"
#include "plug-in-proc.h"
#include "plug-in-progress.h"
#include "plug-in-shm.h"
#include "libgimp/gimpintl.h"
/* local funcion prototypes */
static gboolean plug_in_write (GIOChannel *channel,
guint8 *buf,
gulong count,
gpointer user_data);
static gboolean plug_in_flush (GIOChannel *channel,
gpointer user_data);
static gboolean plug_in_recv_message (GIOChannel *channel,
GIOCondition cond,
gpointer data);
static void plug_in_prep_for_exec (gpointer data);
/* global variables */
PlugIn *current_plug_in = NULL;
/* private variables */
static GSList *open_plug_ins = NULL;
static GSList *plug_in_stack = NULL;
void
plug_in_init (Gimp *gimp)
{
g_return_if_fail (GIMP_IS_GIMP (gimp));
/* initialize the gimp protocol library and set the read and
* write handlers.
*/
gp_init ();
wire_set_writer (plug_in_write);
wire_set_flusher (plug_in_flush);
/* allocate a piece of shared memory for use in transporting tiles
* to plug-ins. if we can't allocate a piece of shared memory then
* we'll fall back on sending the data over the pipe.
*/
if (gimp->use_shm)
plug_in_shm_init (gimp);
}
void
plug_in_exit (Gimp *gimp)
{
GSList *list;
g_return_if_fail (GIMP_IS_GIMP (gimp));
if (gimp->use_shm)
plug_in_shm_exit (gimp);
list = open_plug_ins;
while (list)
{
PlugIn *plug_in;
plug_in = (PlugIn *) list->data;
list = list->next;
if (plug_in->open)
plug_in_close (plug_in, TRUE);
plug_in_unref (plug_in);
}
}
void
plug_in_call_query (Gimp *gimp,
PlugInDef *plug_in_def)
{
PlugIn *plug_in;
g_return_if_fail (GIMP_IS_GIMP (gimp));
g_return_if_fail (plug_in_def != NULL);
plug_in = plug_in_new (gimp, plug_in_def->prog);
if (plug_in)
{
plug_in->query = TRUE;
plug_in->synchronous = TRUE;
plug_in->plug_in_def = plug_in_def;
if (plug_in_open (plug_in))
{
while (plug_in->open)
{
WireMessage msg;
if (! wire_read_msg (plug_in->my_read, &msg, plug_in))
{
plug_in_close (plug_in, TRUE);
}
else
{
plug_in_handle_message (plug_in, &msg);
wire_destroy (&msg);
}
}
}
plug_in_unref (plug_in);
}
}
void
plug_in_call_init (Gimp *gimp,
PlugInDef *plug_in_def)
{
PlugIn *plug_in;
g_return_if_fail (GIMP_IS_GIMP (gimp));
g_return_if_fail (plug_in_def != NULL);
plug_in = plug_in_new (gimp, plug_in_def->prog);
if (plug_in)
{
plug_in->init = TRUE;
plug_in->synchronous = TRUE;
plug_in->plug_in_def = plug_in_def;
if (plug_in_open (plug_in))
{
while (plug_in->open)
{
WireMessage msg;
if (! wire_read_msg (plug_in->my_read, &msg, plug_in))
{
plug_in_close (plug_in, TRUE);
}
else
{
plug_in_handle_message (plug_in, &msg);
wire_destroy (&msg);
}
}
}
plug_in_unref (plug_in);
}
}
PlugIn *
plug_in_new (Gimp *gimp,
gchar *name)
{
PlugIn *plug_in;
g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (g_path_is_absolute (name), NULL);
plug_in = g_new0 (PlugIn, 1);
plug_in->gimp = gimp;
plug_in->ref_count = 1;
plug_in->open = FALSE;
plug_in->query = FALSE;
plug_in->init = FALSE;
plug_in->synchronous = FALSE;
plug_in->recurse = FALSE;
plug_in->in_temp_proc = FALSE;
plug_in->starting_ext = FALSE;
plug_in->pid = 0;
plug_in->args[0] = g_strdup (name);
plug_in->args[1] = g_strdup ("-gimp");
plug_in->args[2] = NULL;
plug_in->args[3] = NULL;
plug_in->args[4] = NULL;
plug_in->args[5] = NULL;
plug_in->args[6] = NULL;
plug_in->my_read = NULL;
plug_in->my_write = NULL;
plug_in->his_read = NULL;
plug_in->his_write = NULL;
plug_in->input_id = 0;
plug_in->write_buffer_index = 0;
plug_in->temp_proc_defs = NULL;
plug_in->main_loops = NULL;
plug_in->return_vals = NULL;
plug_in->n_return_vals = 0;
plug_in->progress = NULL;
plug_in->plug_in_def = NULL;
return plug_in;
}
void
plug_in_ref (PlugIn *plug_in)
{
g_return_if_fail (plug_in != NULL);
plug_in->ref_count++;
}
void
plug_in_unref (PlugIn *plug_in)
{
g_return_if_fail (plug_in != NULL);
plug_in->ref_count--;
if (plug_in->ref_count < 1)
{
if (plug_in->open)
plug_in_close (plug_in, TRUE);
if (plug_in->args[0])
g_free (plug_in->args[0]);
if (plug_in->args[1])
g_free (plug_in->args[1]);
if (plug_in->args[2])
g_free (plug_in->args[2]);
if (plug_in->args[3])
g_free (plug_in->args[3]);
if (plug_in->args[4])
g_free (plug_in->args[4]);
if (plug_in->args[5])
g_free (plug_in->args[5]);
if (plug_in->progress)
plug_in_progress_end (plug_in);
g_free (plug_in);
}
}
static void
plug_in_prep_for_exec (gpointer data)
{
#if !defined(G_OS_WIN32) && !defined (G_WITH_CYGWIN) && !defined(__EMX__)
PlugIn *plug_in = data;
g_io_channel_unref (plug_in->my_read);
plug_in->my_read = NULL;
g_io_channel_unref (plug_in->my_write);
plug_in->my_write = NULL;
#endif
}
gboolean
plug_in_open (PlugIn *plug_in)
{
gint my_read[2];
gint my_write[2];
gchar **envp;
GError *error = NULL;
g_return_val_if_fail (plug_in != NULL, FALSE);
/* Open two pipes. (Bidirectional communication).
*/
if ((pipe (my_read) == -1) || (pipe (my_write) == -1))
{
g_message ("pipe() failed: Unable to start Plug-In \"%s\"\n(%s)",
g_path_get_basename (plug_in->args[0]),
plug_in->args[0]);
return FALSE;
}
#if defined(G_WITH_CYGWIN) || defined(__EMX__)
/* Set to binary mode */
setmode (my_read[0], _O_BINARY);
setmode (my_write[0], _O_BINARY);
setmode (my_read[1], _O_BINARY);
setmode (my_write[1], _O_BINARY);
#endif
plug_in->my_read = g_io_channel_unix_new (my_read[0]);
plug_in->my_write = g_io_channel_unix_new (my_write[1]);
plug_in->his_read = g_io_channel_unix_new (my_write[0]);
plug_in->his_write = g_io_channel_unix_new (my_read[1]);
g_io_channel_set_encoding (plug_in->my_read, NULL, NULL);
g_io_channel_set_encoding (plug_in->my_write, NULL, NULL);
g_io_channel_set_encoding (plug_in->his_read, NULL, NULL);
g_io_channel_set_encoding (plug_in->his_write, NULL, NULL);
g_io_channel_set_buffered (plug_in->my_read, FALSE);
g_io_channel_set_buffered (plug_in->my_write, FALSE);
g_io_channel_set_buffered (plug_in->his_read, FALSE);
g_io_channel_set_buffered (plug_in->his_write, FALSE);
g_io_channel_set_close_on_unref (plug_in->my_read, TRUE);
g_io_channel_set_close_on_unref (plug_in->my_write, TRUE);
g_io_channel_set_close_on_unref (plug_in->his_read, TRUE);
g_io_channel_set_close_on_unref (plug_in->his_write, TRUE);
/* Remember the file descriptors for the pipes.
*/
plug_in->args[2] =
g_strdup_printf ("%d", g_io_channel_unix_get_fd (plug_in->his_read));
plug_in->args[3] =
g_strdup_printf ("%d", g_io_channel_unix_get_fd (plug_in->his_write));
/* Set the rest of the command line arguments.
* FIXME: this is ugly. Pass in the mode as a separate argument?
*/
if (plug_in->query)
{
plug_in->args[4] = g_strdup ("-query");
}
else if (plug_in->init)
{
plug_in->args[4] = g_strdup ("-init");
}
else
{
plug_in->args[4] = g_strdup ("-run");
}
plug_in->args[5] = g_strdup_printf ("%d", plug_in->gimp->stack_trace_mode);
#ifdef __EMX__
fcntl (my_read[0], F_SETFD, 1);
fcntl (my_write[1], F_SETFD, 1);
#endif
/* Fork another process. We'll remember the process id so that we
* can later use it to kill the filter if necessary.
*/
envp = gimp_environ_table_get_envp (plug_in->gimp->environ_table);
if (! g_spawn_async (NULL, plug_in->args, envp,
G_SPAWN_LEAVE_DESCRIPTORS_OPEN |
G_SPAWN_DO_NOT_REAP_CHILD,
plug_in_prep_for_exec, plug_in,
&plug_in->pid,
&error))
{
g_message ("Unable to run Plug-In: \"%s\"\n(%s)\n%s",
g_path_get_basename (plug_in->args[0]),
plug_in->args[0],
error->message);
g_error_free (error);
return FALSE;
}
g_io_channel_unref (plug_in->his_read);
plug_in->his_read = NULL;
g_io_channel_unref (plug_in->his_write);
plug_in->his_write = NULL;
if (! plug_in->synchronous)
{
plug_in->input_id = g_io_add_watch (plug_in->my_read,
G_IO_IN | G_IO_PRI |
G_IO_ERR | G_IO_HUP,
plug_in_recv_message,
plug_in);
open_plug_ins = g_slist_prepend (open_plug_ins, plug_in);
}
plug_in->open = TRUE;
return TRUE;
}
void
plug_in_close (PlugIn *plug_in,
gboolean kill_it)
{
gint status;
#ifndef G_OS_WIN32
struct timeval tv;
#endif
g_return_if_fail (plug_in != NULL);
g_return_if_fail (plug_in->open == TRUE);
if (! plug_in->open)
return;
plug_in->open = FALSE;
/* Ask the filter to exit gracefully */
if (kill_it && plug_in->pid)
{
gp_quit_write (plug_in->my_write, plug_in);
/* give the plug-in some time (10 ms) */
#ifndef G_OS_WIN32
tv.tv_sec = 0;
tv.tv_usec = 100; /* But this is 0.1 ms? */
select (0, NULL, NULL, NULL, &tv);
#else
Sleep (10);
#endif
}
/* If necessary, kill the filter. */
#ifndef G_OS_WIN32
if (kill_it && plug_in->pid)
status = kill (plug_in->pid, SIGKILL);
/* Wait for the process to exit. This will happen
* immediately if it was just killed.
*/
if (plug_in->pid)
waitpid (plug_in->pid, &status, 0);
#else
if (kill_it && plug_in->pid)
{
/* Trying to avoid TerminateProcess (does mostly work).
* Otherwise some of our needed DLLs may get into an unstable state
* (see Win32 API docs).
*/
DWORD dwExitCode = STILL_ACTIVE;
DWORD dwTries = 10;
while ((STILL_ACTIVE == dwExitCode)
&& GetExitCodeProcess ((HANDLE) plug_in->pid, &dwExitCode)
&& (dwTries > 0))
{
Sleep(10);
dwTries--;
}
if (STILL_ACTIVE == dwExitCode)
{
g_warning ("Terminating %s ...", plug_in->args[0]);
TerminateProcess ((HANDLE) plug_in->pid, 0);
}
}
#endif
plug_in->pid = 0;
/* Remove the input handler. */
if (plug_in->input_id)
{
g_source_remove (plug_in->input_id);
plug_in->input_id = 0;
}
/* Close the pipes. */
if (plug_in->my_read != NULL)
{
g_io_channel_unref (plug_in->my_read);
plug_in->my_read = NULL;
}
if (plug_in->my_write != NULL)
{
g_io_channel_unref (plug_in->my_write);
plug_in->my_write = NULL;
}
if (plug_in->his_read != NULL)
{
g_io_channel_unref (plug_in->his_read);
plug_in->his_read = NULL;
}
if (plug_in->his_write != NULL)
{
g_io_channel_unref (plug_in->his_write);
plug_in->his_write = NULL;
}
wire_clear_error ();
if (plug_in->progress)
plug_in_progress_end (plug_in);
if (plug_in->recurse)
{
while (plug_in->main_loops)
{
g_warning ("plug_in_close: quitting stale main loop\n");
plug_in_main_loop_quit (plug_in);
}
plug_in->recurse = FALSE;
}
plug_in->synchronous = FALSE;
/* Unregister any temporary procedures. */
if (plug_in->temp_proc_defs)
{
GSList *list;
for (list = plug_in->temp_proc_defs; list; list = g_slist_next (list))
plug_ins_temp_proc_def_remove (plug_in->gimp,
(PlugInProcDef *) list->data);
g_slist_free (plug_in->temp_proc_defs);
plug_in->temp_proc_defs = NULL;
}
/* Close any dialogs that this plugin might have opened */
brush_select_dialogs_check ();
gradient_select_dialogs_check ();
palette_select_dialogs_check ();
pattern_select_dialogs_check ();
open_plug_ins = g_slist_remove (open_plug_ins, plug_in);
}
static gboolean
plug_in_recv_message (GIOChannel *channel,
GIOCondition cond,
gpointer data)
{
PlugIn *plug_in;
gboolean got_message = FALSE;
plug_in = (PlugIn *) data;
if (plug_in->my_read == NULL)
return TRUE;
if (cond & (G_IO_IN | G_IO_PRI))
{
WireMessage msg;
memset (&msg, 0, sizeof (WireMessage));
if (! wire_read_msg (plug_in->my_read, &msg, plug_in))
{
plug_in_close (plug_in, TRUE);
}
else
{
plug_in_handle_message (plug_in, &msg);
wire_destroy (&msg);
got_message = TRUE;
}
}
if (cond & (G_IO_ERR | G_IO_HUP))
{
if (plug_in->open)
{
plug_in_close (plug_in, TRUE);
}
}
if (! got_message)
g_message (_("Plug-In crashed: \"%s\"\n(%s)\n\n"
"The dying Plug-In may have messed up GIMP's internal state.\n"
"You may want to save your images and restart GIMP\n"
"to be on the safe side."),
g_path_get_basename (plug_in->args[0]),
plug_in->args[0]);
if (! plug_in->open)
plug_in_unref (plug_in);
return TRUE;
}
static gboolean
plug_in_write (GIOChannel *channel,
guint8 *buf,
gulong count,
gpointer user_data)
{
PlugIn *plug_in;
gulong bytes;
plug_in = (PlugIn *) user_data;
while (count > 0)
{
if ((plug_in->write_buffer_index + count) >= WRITE_BUFFER_SIZE)
{
bytes = WRITE_BUFFER_SIZE - plug_in->write_buffer_index;
memcpy (&plug_in->write_buffer[plug_in->write_buffer_index],
buf, bytes);
plug_in->write_buffer_index += bytes;
if (! wire_flush (channel, plug_in))
return FALSE;
}
else
{
bytes = count;
memcpy (&plug_in->write_buffer[plug_in->write_buffer_index],
buf, bytes);
plug_in->write_buffer_index += bytes;
}
buf += bytes;
count -= bytes;
}
return TRUE;
}
static gboolean
plug_in_flush (GIOChannel *channel,
gpointer user_data)
{
PlugIn *plug_in;
plug_in = (PlugIn *) user_data;
if (plug_in->write_buffer_index > 0)
{
GIOStatus status;
GError *error = NULL;
gint count;
gsize bytes;
count = 0;
while (count != plug_in->write_buffer_index)
{
do
{
bytes = 0;
status = g_io_channel_write_chars (channel,
&plug_in->write_buffer[count],
(plug_in->write_buffer_index - count),
&bytes,
&error);
}
while (status == G_IO_STATUS_AGAIN);
if (status != G_IO_STATUS_NORMAL)
{
if (error)
{
g_warning ("%s: plug_in_flush(): error: %s",
g_get_prgname (), error->message);
g_error_free (error);
}
else
{
g_warning ("%s: plug_in_flush(): error",
g_get_prgname ());
}
return FALSE;
}
count += bytes;
}
plug_in->write_buffer_index = 0;
}
return TRUE;
}
void
plug_in_push (PlugIn *plug_in)
{
g_return_if_fail (plug_in != NULL);
current_plug_in = plug_in;
plug_in_stack = g_slist_prepend (plug_in_stack, current_plug_in);
}
void
plug_in_pop (void)
{
GSList *tmp;
if (current_plug_in)
{
tmp = plug_in_stack;
plug_in_stack = plug_in_stack->next;
tmp->next = NULL;
g_slist_free (tmp);
}
if (plug_in_stack)
{
current_plug_in = plug_in_stack->data;
}
else
{
current_plug_in = NULL;
}
}
void
plug_in_main_loop (PlugIn *plug_in)
{
GMainLoop *main_loop;
g_return_if_fail (plug_in != NULL);
main_loop = g_main_loop_new (NULL, FALSE);
plug_in->main_loops = g_list_prepend (plug_in->main_loops, main_loop);
gimp_threads_leave (plug_in->gimp);
g_main_loop_run (main_loop);
gimp_threads_enter (plug_in->gimp);
g_main_loop_unref (main_loop);
}
void
plug_in_main_loop_quit (PlugIn *plug_in)
{
g_return_if_fail (plug_in != NULL);
if (! plug_in->main_loops)
{
g_warning ("plug_in_main_loop_quit: called without a main loop running");
return;
}
g_main_loop_quit ((GMainLoop *) plug_in->main_loops->data);
plug_in->main_loops = g_list_remove (plug_in->main_loops,
plug_in->main_loops->data);
}
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