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/* Metacity UI Slave Messages */
/*
* Copyright (C) 2001 Havoc Pennington
*
* 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 "messages.h"
#include "main.h"
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <config.h>
typedef enum
{
READ_FAILED = 0, /* FALSE */
READ_OK,
READ_EOF
} ReadResult;
static ReadResult read_data (GString *str,
gint fd);
static void send_message (MetaMessage *message);
#define META_MESSAGE_LENGTH(real_type) \
(G_STRUCT_OFFSET (real_type, footer) + sizeof (MetaMessageFooter))
void
meta_message_send_check (void)
{
MetaMessageCheck check;
memset (&check, 0, META_MESSAGE_LENGTH (MetaMessageCheck));
check.header.message_code = MetaMessageCheckCode;
check.header.length = META_MESSAGE_LENGTH (MetaMessageCheck);
strcpy (check.metacity_version, VERSION);
strcpy (check.host_alias, HOST_ALIAS);
check.metacity_version[META_MESSAGE_MAX_VERSION_LEN] = '\0';
check.host_alias[META_MESSAGE_MAX_HOST_ALIAS_LEN] = '\0';
check.messages_version = META_MESSAGES_VERSION;
send_message ((MetaMessage*)&check);
}
static int
write_bytes (void *buf, int bytes)
{
const char *p;
int left;
left = bytes;
p = (char*) buf;
while (left > 0)
{
int written;
written = write (1, p, left);
if (written < 0)
return -1;
left -= written;
p += written;
}
g_assert (p == ((char*)buf) + bytes);
return 0;
}
#if 0
static void
print_mem (int fd, void *mem, int len)
{
char *p = (char*) mem;
int i;
char unknown = 'Z';
char null = 'n';
i = 0;
while (i < len)
{
if (p[i] == '\0')
write (fd, &null, 1);
else if (isascii (p[i]))
write (fd, p + i, 1);
else
write (fd, &unknown, 1);
++i;
}
}
#endif
static void
send_message (MetaMessage *message)
{
static int serial = 0;
MetaMessageFooter *footer;
message->header.serial = serial;
footer = META_MESSAGE_FOOTER (message);
footer->checksum = META_MESSAGE_CHECKSUM (message);
++serial;
#if 0
meta_ui_warning ("'");
print_mem (2, message, message->header.length);
meta_ui_warning ("'\n");
#endif
if (write_bytes (META_MESSAGE_ESCAPE, META_MESSAGE_ESCAPE_LEN) < 0)
meta_ui_warning ("Failed to write escape sequence: %s\n",
g_strerror (errno));
if (write_bytes (message, message->header.length) < 0)
meta_ui_warning ("Failed to write message: %s\n",
g_strerror (errno));
}
static ReadResult
read_data (GString *str,
gint fd)
{
gint bytes;
gchar buf[4096];
again:
bytes = read (fd, &buf, 4096);
if (bytes == 0)
return READ_EOF;
else if (bytes > 0)
{
g_string_append_len (str, buf, bytes);
return READ_OK;
}
else if (bytes < 0 && errno == EINTR)
goto again;
else if (bytes < 0)
{
meta_ui_warning (_("Failed to read data from window manager (%s)\n"),
g_strerror (errno));
return READ_FAILED;
}
else
return READ_OK;
}
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