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NetBSD/usr.sbin/wsmoused/wsmoused.c

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/* $NetBSD: wsmoused.c,v 1.21 2004/02/05 16:11:31 jmmv Exp $ */
/*
* Copyright (c) 2002, 2003, 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Julio M. Merino Vidal.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name authors may not be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 2002, 2003\n"
"The NetBSD Foundation, Inc. All rights reserved.\n");
__RCSID("$NetBSD: wsmoused.c,v 1.21 2004/02/05 16:11:31 jmmv Exp $");
#endif /* not lint */
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/tty.h>
#include <dev/wscons/wsconsio.h>
#include <err.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <util.h>
#include "pathnames.h"
#include "wsmoused.h"
/* --------------------------------------------------------------------- */
/*
* Global variables.
*/
static struct mouse Mouse;
static char *Pid_File = NULL;
static int Foreground = 1;
static int X_Console = -1;
static int X_Console_Delay = 5;
#ifdef WSMOUSED_SELECTION_MODE
extern struct mode_bootstrap Action_Mode;
#endif
#ifdef WSMOUSED_SELECTION_MODE
extern struct mode_bootstrap Selection_Mode;
#endif
#define MAX_MODES 2
static struct mode_bootstrap *Modes[MAX_MODES];
static struct mode_bootstrap *Avail_Modes[] = {
#ifdef WSMOUSED_ACTION_MODE
&Action_Mode,
#endif
#ifdef WSMOUSED_SELECTION_MODE
&Selection_Mode,
#endif
};
/* --------------------------------------------------------------------- */
/*
* Prototypes for functions private to this module.
*/
static void usage(void);
static void open_device(unsigned int);
static void init_mouse(void);
static void event_loop(void);
static void generic_wscons_event(struct wscons_event);
static int attach_mode(const char *);
static void attach_modes(char *);
static void detach_mode(const char *);
static void detach_modes(void);
static void signal_terminate(int);
int main(int, char **);
/* --------------------------------------------------------------------- */
/* Shows program usage information and exits. */
static void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-d device] [-f config_file] [-m modes] [-n]\n",
getprogname());
exit(EXIT_FAILURE);
}
/* --------------------------------------------------------------------- */
/* Logs the given error message to syslog if running in daemon mode, or
* to the console if running in the foreground. */
void
log_err(int e, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (Foreground)
verr(e, fmt, ap);
else {
int olderrno = errno;
vsyslog(LOG_DAEMON | LOG_ERR, fmt, ap);
errno = olderrno;
syslog(LOG_DAEMON | LOG_ERR, "%m");
exit(e);
}
/* NOTREACHED */
va_end(ap);
}
/* --------------------------------------------------------------------- */
/* Logs the given error message to syslog if running in daemon mode, or
* to the console if running in the foreground. */
void
log_errx(int e, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (Foreground)
verrx(e, fmt, ap);
else {
vsyslog(LOG_DAEMON | LOG_ERR, fmt, ap);
exit(e);
}
/* NOTREACHED */
va_end(ap);
}
/* --------------------------------------------------------------------- */
/* Logs the given info message to syslog if running in daemon mode, or
* to the console if running in the foreground. */
void
log_info(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (Foreground) {
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
} else
vsyslog(LOG_DAEMON | LOG_INFO, fmt, ap);
va_end(ap);
}
/* --------------------------------------------------------------------- */
/* Logs the given warning message to syslog if running in daemon mode, or
* to the console if running in the foreground. */
void
log_warn(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (Foreground)
vwarn(fmt, ap);
else {
int olderrno = errno;
vsyslog(LOG_DAEMON | LOG_WARNING, fmt, ap);
errno = olderrno;
syslog(LOG_DAEMON | LOG_WARNING, "%m");
}
va_end(ap);
}
/* --------------------------------------------------------------------- */
/* Logs the given warning message to syslog if running in daemon mode, or
* to the console if running in the foreground. */
void
log_warnx(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (Foreground)
vwarnx(fmt, ap);
else
vsyslog(LOG_DAEMON | LOG_WARNING, fmt, ap);
va_end(ap);
}
/* --------------------------------------------------------------------- */
/* Initializes mouse information. Basically, it opens required files
* for the daemon to work. */
static void
init_mouse(void)
{
Mouse.m_devfd = -1;
open_device(0);
/* Open FIFO, if wanted */
Mouse.m_fifofd = -1;
if (Mouse.m_fifoname != NULL) {
Mouse.m_fifofd = open(Mouse.m_fifoname,
O_RDWR | O_NONBLOCK, 0);
if (Mouse.m_fifofd == -1)
log_err(EXIT_FAILURE, "cannot open %s",
Mouse.m_fifoname);
}
}
/* --------------------------------------------------------------------- */
/* Opens the mouse device (if not already opened). The argument `secs'
* specifies how much seconds the function will wait before trying to
* open the device; this is used when returning from the X console. */
static void
open_device(unsigned int secs)
{
if (Mouse.m_devfd != -1)
return;
sleep(secs);
/* Open mouse file descriptor */
Mouse.m_devfd = open(Mouse.m_devname, O_RDONLY | O_NONBLOCK, 0);
if (Mouse.m_devfd == -1)
log_err(EXIT_FAILURE, "cannot open %s", Mouse.m_devname);
}
/* --------------------------------------------------------------------- */
/* Main program event loop. This function polls the wscons status
* device and the mouse device; whenever an event is received, the
* appropiate callback is fired for all attached modes. If the polls
* times out (which only appens when the mouse is disabled), another
* callback is launched. */
static void
event_loop(void)
{
int i, res;
struct pollfd fds[2];
struct wscons_event event;
fds[0].fd = Mouse.m_statfd;
fds[0].events = POLLIN;
for (;;) {
fds[1].fd = Mouse.m_devfd;
fds[1].events = POLLIN;
if (Mouse.m_disabled)
res = poll(fds, 1, INFTIM);
else
res = poll(fds, 2, 300);
if (res < 0)
log_warn("failed to read from devices");
if (fds[0].revents & POLLIN) {
res = read(Mouse.m_statfd, &event, sizeof(event));
if (res != sizeof(event))
log_warn("failed to read from mouse stat");
for (i = 0; i < MAX_MODES && Modes[i] != NULL; i++)
if (Modes[i]->mb_wscons_event != NULL)
Modes[i]->mb_wscons_event(event, 1);
generic_wscons_event(event);
for (i = 0; i < MAX_MODES && Modes[i] != NULL; i++)
if (Modes[i]->mb_wscons_event != NULL)
Modes[i]->mb_wscons_event(event, 0);
} else if (fds[1].revents & POLLIN) {
res = read(Mouse.m_devfd, &event, sizeof(event));
if (res != sizeof(event))
log_warn("failed to read from mouse");
if (Mouse.m_fifofd >= 0) {
res = write(Mouse.m_fifofd, &event,
sizeof(event));
if (res != sizeof(event))
log_warn("failed to write to fifo");
}
for (i = 0; i < MAX_MODES && Modes[i] != NULL; i++)
if (Modes[i]->mb_wsmouse_event != NULL)
Modes[i]->mb_wsmouse_event(event);
} else {
for (i = 0; i < MAX_MODES && Modes[i] != NULL; i++)
if (Modes[i]->mb_poll_timeout != NULL)
Modes[i]->mb_poll_timeout();
}
}
}
/* --------------------------------------------------------------------- */
/* This function parses generic wscons status events. Actually, it
* handles the screen switch event to enable or disable the mouse,
* depending if we are entering or leaving the X console. */
static void
generic_wscons_event(struct wscons_event evt)
{
switch (evt.type) {
case WSCONS_EVENT_SCREEN_SWITCH:
if (evt.value == X_Console) {
Mouse.m_disabled = 1;
(void)close(Mouse.m_devfd);
Mouse.m_devfd = -1;
} else {
if (Mouse.m_disabled) {
open_device(X_Console_Delay);
Mouse.m_disabled = 0;
} else {
(void)close(Mouse.m_devfd);
Mouse.m_devfd = -1;
open_device(0);
}
}
break;
}
}
/* --------------------------------------------------------------------- */
/* Attaches a mode to the list of active modes, based on its name.
* Returns 1 on success or 0 if the mode fails to initialize or there is
* any other problem. */
static int
attach_mode(const char *name)
{
int i, pos;
struct mode_bootstrap *mb;
for (i = 0, pos = -1; i < MAX_MODES; i++)
if (Modes[i] == NULL) {
pos = i;
break;
}
if (pos == -1) {
log_warnx("modes table full; cannot register `%s'", name);
return 0;
}
for (i = 0; i < MAX_MODES; i++) {
mb = Avail_Modes[i];
if (mb != NULL && strcmp(name, mb->mb_name) == 0) {
int res;
res = mb->mb_startup(&Mouse);
if (res == 0) {
log_warnx("startup failed for `%s' mode",
mb->mb_name);
return 0;
} else {
Modes[pos] = mb;
return 1;
}
}
}
log_warnx("unknown mode `%s' (see the `modes' directive)", name);
return 0;
}
/* --------------------------------------------------------------------- */
/* Attaches all modes given in the whitespace separated string `list'.
* A fatal error is produced if no active modes can be attached. */
static void
attach_modes(char *list)
{
char *last, *p;
int count;
/* Attach all requested modes */
(void)memset(&Modes, 0, sizeof(struct mode_bootstrap *) * MAX_MODES);
for (count = 0, (p = strtok_r(list, " ", &last)); p;
(p = strtok_r(NULL, " ", &last))) {
if (attach_mode(p))
count++;
}
if (count == 0)
log_errx(EXIT_FAILURE, "no active modes found; exiting...");
}
/* --------------------------------------------------------------------- */
/* Detaches a mode from the active modes list based on its name. */
static void
detach_mode(const char *name)
{
int i;
struct mode_bootstrap *mb;
for (i = 0; i < MAX_MODES; i++) {
mb = Modes[i];
if (mb != NULL && strcmp(name, mb->mb_name) == 0) {
int res;
res = mb->mb_cleanup();
if (res == 0) {
log_warnx("cleanup failed for `%s' mode",
mb->mb_name);
return;
} else {
Modes[i] = NULL;
return;
}
}
}
log_warnx("unknown mode `%s' (see the `modes' directive)", name);
}
/* --------------------------------------------------------------------- */
/* Detaches all active modes. */
static void
detach_modes(void)
{
int i;
for (i = 0; i < MAX_MODES && Modes[i] != NULL; i++)
detach_mode(Modes[i]->mb_name);
}
/* --------------------------------------------------------------------- */
/* Signal handler for close signals. The program can only be exited
* through this function. */
/* ARGSUSED */
static void
signal_terminate(int sig)
{
detach_modes();
config_free();
exit(EXIT_SUCCESS);
}
/* --------------------------------------------------------------------- */
/* Main program. Parses command line options, reads the configuration
* file, initializes the mouse and associated files and launches the main
* event loop. */
int
main(int argc, char **argv)
{
char *conffile, *modelist, *tstat;
int needconf, nodaemon, opt;
struct block *conf;
setprogname(argv[0]);
(void)memset(&Mouse, 0, sizeof(struct mouse));
conffile = _PATH_CONF;
modelist = NULL;
needconf = 0;
nodaemon = -1;
/* Parse command line options */
while ((opt = getopt(argc, argv, "d:f:m:n")) != -1) {
switch (opt) {
case 'd': /* Mouse device name */
Mouse.m_devname = optarg;
break;
case 'f': /* Configuration file name */
needconf = 1;
conffile = optarg;
break;
case 'm': /* List of modes to activate */
modelist = optarg;
break;
case 'n': /* No daemon */
nodaemon = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
/* Read the configuration file and get some basic properties */
config_read(conffile, needconf);
conf = config_get_mode("Global");
if (nodaemon == -1)
nodaemon = block_get_propval_int(conf, "nodaemon", 0);
X_Console = block_get_propval_int(conf, "xconsole", -1);
X_Console_Delay = block_get_propval_int(conf, "xconsole_delay",
X_Console_Delay);
/* Open wsdisplay status device */
tstat = block_get_propval(conf, "ttystat", _PATH_TTYSTAT);
Mouse.m_statfd = open(tstat, O_RDONLY | O_NONBLOCK, 0);
if (Mouse.m_statfd == -1)
log_err(EXIT_FAILURE, "cannot open %s", tstat);
/* Initialize mouse information and attach modes */
if (Mouse.m_devname == NULL)
Mouse.m_devname = block_get_propval(conf, "device",
_PATH_DEFAULT_MOUSE);
Mouse.m_fifoname = block_get_propval(conf, "fifo", NULL);
init_mouse();
if (modelist != NULL)
attach_modes(modelist);
else
attach_modes(block_get_propval(conf, "modes", "selection"));
/* Setup signal handlers */
(void)signal(SIGINT, signal_terminate);
(void)signal(SIGKILL, signal_terminate);
(void)signal(SIGQUIT, signal_terminate);
(void)signal(SIGTERM, signal_terminate);
if (!nodaemon) {
/* Become a daemon */
if (daemon(0, 0) == -1)
log_err(EXIT_FAILURE, "failed to become a daemon");
/* Create the pidfile, if wanted */
Pid_File = block_get_propval(conf, "pidfile", NULL);
if (pidfile(Pid_File) == -1)
log_warn("pidfile %s", Pid_File);
Foreground = 0;
}
event_loop();
/* NOTREACHED */
return EXIT_SUCCESS;
}
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