lcd4linux_SOURCES = \
lcd4linux.c \
cfg.c cfg.h \
+lock.c lock.h \
parser.c parser.h \
processor.c processor.h \
system.c system.h \
lcd4linux_LDFLAGS = $(X_LIBS)
@WITH_X_TRUE@lcd4linux_LDADD = -lX11
-lcd4linux_SOURCES = lcd4linux.c cfg.c cfg.h parser.c parser.h processor.c processor.h system.c system.h isdn.c isdn.h filter.c filter.h display.c display.h pixmap.c pixmap.h fontmap.c fontmap.h Skeleton.c MatrixOrbital.c Raster.c XWindow.c
+lcd4linux_SOURCES = lcd4linux.c cfg.c cfg.h lock.c lock.h parser.c parser.h processor.c processor.h system.c system.h isdn.c isdn.h filter.c filter.h display.c display.h pixmap.c pixmap.h fontmap.c fontmap.h Skeleton.c MatrixOrbital.c Raster.c XWindow.c
ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs
X_LIBS = @X_LIBS@
X_EXTRA_LIBS = @X_EXTRA_LIBS@
X_PRE_LIBS = @X_PRE_LIBS@
-lcd4linux_OBJECTS = lcd4linux.o cfg.o parser.o processor.o system.o \
-isdn.o filter.o display.o pixmap.o fontmap.o Skeleton.o MatrixOrbital.o \
-Raster.o XWindow.o
+lcd4linux_OBJECTS = lcd4linux.o cfg.o lock.o parser.o processor.o \
+system.o isdn.o filter.o display.o pixmap.o fontmap.o Skeleton.o \
+MatrixOrbital.o Raster.o XWindow.o
@WITH_X_TRUE@lcd4linux_DEPENDENCIES =
CFLAGS = @CFLAGS@
COMPILE = $(CC) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
GZIP_ENV = --best
DEP_FILES = .deps/MatrixOrbital.P .deps/Raster.P .deps/Skeleton.P \
.deps/XWindow.P .deps/cfg.P .deps/display.P .deps/filter.P \
-.deps/fontmap.P .deps/isdn.P .deps/lcd4linux.P .deps/parser.P \
-.deps/pixmap.P .deps/processor.P .deps/system.P
+.deps/fontmap.P .deps/isdn.P .deps/lcd4linux.P .deps/lock.P \
+.deps/parser.P .deps/pixmap.P .deps/processor.P .deps/system.P
SOURCES = $(lcd4linux_SOURCES)
OBJECTS = $(lcd4linux_OBJECTS)
-/* $Id: MatrixOrbital.c,v 1.12 2000/03/26 18:46:28 reinelt Exp $
+/* $Id: MatrixOrbital.c,v 1.13 2000/04/07 05:42:20 reinelt Exp $
*
* driver for Matrix Orbital serial display modules
*
*
*
* $Log: MatrixOrbital.c,v $
+ * Revision 1.13 2000/04/07 05:42:20 reinelt
+ *
+ * UUCP style lockfiles for the serial port
+ *
* Revision 1.12 2000/03/26 18:46:28 reinelt
*
* bug in pixmap.c that leaded to empty bars fixed
#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
+#include <errno.h>
#include <unistd.h>
+#include <signal.h>
#include <termios.h>
#include <fcntl.h>
-#include <string.h>
-#include <errno.h>
#include "cfg.h"
+#include "lock.h"
#include "display.h"
#define SPEED 19200
static int MO_open (void)
{
int fd;
+ pid_t pid;
struct termios portset;
+ if ((pid=lock_port(Port))!=0) {
+ if (pid==-1)
+ fprintf (stderr, "MatrixOrbital: port %s could not be locked\n", Port);
+ else
+ fprintf (stderr, "MatrixOrbital: port %s is locked by process %d\n", Port, pid);
+ return -1;
+ }
fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY);
if (fd==-1) {
fprintf (stderr, "MatrixOrbital: open(%s) failed: %s\n", Port, strerror(errno));
return 0;
}
+static void MO_quit (int signal); //forward decvlaration
+
int MO_init (LCD *Self)
{
char *port;
Device=MO_open();
if (Device==-1) return -1;
+ signal(SIGINT, MO_quit);
+ signal(SIGQUIT, MO_quit);
+ signal(SIGTERM, MO_quit);
+
MO_clear();
MO_contrast();
return 0;
}
+static void MO_quit (int signal)
+{
+ MO_clear();
+ MO_flush();
+ close (Device);
+ unlock_port(Port);
+ exit (0);
+}
LCD MatrixOrbital[] = {
{ "LCD0821", 2, 8, XRES, YRES, BARS, MO_init, MO_clear, MO_put, MO_bar, MO_flush },
-/* $Id: lcd4linux.c,v 1.17 2000/04/03 17:31:52 reinelt Exp $
+/* $Id: lcd4linux.c,v 1.18 2000/04/07 05:42:20 reinelt Exp $
*
* LCD4Linux
*
*
*
* $Log: lcd4linux.c,v $
+ * Revision 1.18 2000/04/07 05:42:20 reinelt
+ *
+ * UUCP style lockfiles for the serial port
+ *
* Revision 1.17 2000/04/03 17:31:52 reinelt
*
* suppress welcome message if display is smaller than 20x2
printf ("usage: lcd4linux [-h] [-l] [-c key=value] [-f config-file] [-o output-file]\n");
}
+static int hello (void)
+{
+ int x, y;
+
+ lcd_query (&y, &x, NULL, NULL, NULL);
+
+ if (x>=20) {
+ lcd_put (1, 1, "* LCD4Linux V" VERSION " *");
+ lcd_put (2, 1, " (c) 2000 M.Reinelt");
+ } else if (x >=16) {
+ lcd_put (1, 1, "LCD4Linux " VERSION);
+ lcd_put (2, 1, "(c) M.Reinelt");
+ } else if (x >=9) {
+ lcd_put (1, 1, "LCD4Linux");
+ } else if (x>=7) {
+ lcd_put (1, 1, "L4Linux");
+ } else return 0;
+
+ lcd_put (1, 1, "* LCD4Linux V" VERSION " *");
+ lcd_put (2, 1, " (c) 2000 M.Reinelt");
+ lcd_flush();
+ return 1;
+}
+
int main (int argc, char *argv[])
{
char *cfg="/etc/lcd4linux.conf";
char *driver;
- int c, x, y, smooth;
+ int c, smooth;
while ((c=getopt (argc, argv, "c:f:hlo:"))!=EOF) {
switch (c) {
process_init();
lcd_clear();
- lcd_query (&y, &x, NULL, NULL, NULL);
- if (x>=20 && y>=2) {
- lcd_put (1, 1, "* LCD4Linux V" VERSION " *");
- lcd_put (2, 1, " (c) 2000 M.Reinelt");
- lcd_flush();
+ if (hello()) {
sleep (3);
lcd_clear();
}
-
+
smooth=0;
while (1) {
process (smooth);
--- /dev/null
+/* $Id: lock.c,v 1.1 2000/04/07 05:42:20 reinelt Exp $
+ *
+ * UUCP style locking
+ *
+ * Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at)
+ *
+ * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: lock.c,v $
+ * Revision 1.1 2000/04/07 05:42:20 reinelt
+ *
+ * UUCP style lockfiles for the serial port
+ *
+ */
+
+/*
+ * exported functions:
+ *
+ * pid_t lock_port (char *port)
+ * returns 0 if port could be successfully locked
+ * otherwise returns PID of the process holding the lock
+ *
+ * pid_t unlock_port (char *port)
+ * returns 0 if port could be successfully unlocked
+ * otherwise returns PID of the process holding the lock
+ *
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+
+#include "lock.h"
+
+
+pid_t lock_port (char *port)
+{
+ char lockfile[256];
+ char tempfile[256];
+ char buffer[16];
+ char *p;
+ int fd, len, pid;
+
+ if ((p=strrchr (port, '/'))==NULL)
+ p=port;
+ else
+ p++;
+
+ snprintf(lockfile, sizeof(lockfile), LOCK, p);
+ snprintf(tempfile, sizeof(tempfile), LOCK, "TMP.XXXXXX");
+
+ if (mktemp(tempfile)==NULL) {
+ fprintf(stderr, "mktemp(%s) failed.\n", tempfile);
+ return -1;
+ }
+
+ if ((fd=creat(tempfile, 0664))==-1) {
+ fprintf(stderr, "creat(%s) failed: %s\n", tempfile, strerror(errno));
+ return -1;
+ }
+
+ snprintf (buffer, sizeof(buffer), "%10d\n", (int)getpid());
+ if (write(fd, buffer, strlen(buffer))!=strlen(buffer)) {
+ fprintf(stderr, "write(%s) failed: %s\n", tempfile, strerror(errno));
+ close(fd);
+ unlink(tempfile);
+ return -1;
+ }
+ close (fd);
+
+
+ while (link(tempfile, lockfile)==-1) {
+
+ if (errno!=EEXIST) {
+ fprintf(stderr, "link(%s, %s) failed: %s\n", tempfile, lockfile, strerror(errno));
+ unlink(tempfile);
+ return -1;
+ }
+
+ if ((fd=open(lockfile, O_RDONLY))==-1) {
+ if (errno==ENOENT) continue; // lockfile disappared
+ fprintf (stderr, "open(%s) failed: %s\n", lockfile, strerror(errno));
+ unlink (tempfile);
+ return -1;
+ }
+
+ len=read(fd, buffer, sizeof(buffer)-1);
+ if (len<0) {
+ fprintf (stderr, "read(%s) failed: %s\n", lockfile, strerror(errno));
+ unlink (tempfile);
+ return -1;
+ }
+
+ buffer[len]='\0';
+ if (sscanf(buffer, "%d", &pid)!=1 || pid==0) {
+ fprintf (stderr, "scan(%s) failed.\n", lockfile);
+ unlink (tempfile);
+ return -1;
+ }
+
+ if (pid==getpid()) {
+ fprintf (stderr, "%s already locked by us. uh-oh...\n", lockfile);
+ unlink(tempfile);
+ return 0;
+ }
+
+ if ((kill(pid, 0)==-1) && errno==ESRCH) {
+ fprintf (stderr, "removing stale lockfile %s\n", lockfile);
+ if (unlink(lockfile)==-1 && errno!=ENOENT) {
+ fprintf (stderr, "unlink(%s) failed: %s\n", lockfile, strerror(errno));
+ unlink(tempfile);
+ return pid;
+ }
+ continue;
+ }
+ unlink (tempfile);
+ return pid;
+ }
+
+ unlink (tempfile);
+ return 0;
+}
+
+
+pid_t unlock_port (char *port)
+{
+ char lockfile[256];
+ char *p;
+
+ if ((p=strrchr (port, '/'))==NULL)
+ p=port;
+ else
+ p++;
+
+ snprintf(lockfile, sizeof(lockfile), LOCK, p);
+ unlink (lockfile);
+ return 0;
+}
--- /dev/null
+/* $Id: lock.h,v 1.1 2000/04/07 05:42:20 reinelt Exp $
+ *
+ * UUCP style port locking
+ *
+ * Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at)
+ *
+ * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: lock.h,v $
+ * Revision 1.1 2000/04/07 05:42:20 reinelt
+ *
+ * UUCP style lockfiles for the serial port
+ *
+ */
+
+#ifndef _LOCK_H_
+#define _LOCK_H_
+
+#define LOCK "/var/lock/LCK..%s"
+
+pid_t lock_port (char *port);
+pid_t unlock_port (char *port);
+
+#endif
projects / lcd4linux.git / commitdiff