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authorreinelt <>2000-04-07 05:42:20 +0000
committerreinelt <>2000-04-07 05:42:20 +0000
commit65540b205445edffe8ca75e7d797ea2f3d9ab41d (patch)
treee289981edc6218ca381876155d0a81cfe527d25e /MatrixOrbital.c
parentccb26ef39584226382cf4b5f895f4e2472975694 (diff)
downloadlcd4linux-65540b205445edffe8ca75e7d797ea2f3d9ab41d.tar.gz
[lcd4linux @ 2000-04-07 05:42:20 by reinelt]
UUCP style lockfiles for the serial port
Diffstat (limited to 'MatrixOrbital.c')
-rw-r--r--MatrixOrbital.c34
1 files changed, 31 insertions, 3 deletions
diff --git a/MatrixOrbital.c b/MatrixOrbital.c
index 833c794..fd77b85 100644
--- a/MatrixOrbital.c
+++ b/MatrixOrbital.c
@@ -1,4 +1,4 @@
-/* $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
*
@@ -20,6 +20,10 @@
*
*
* $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
@@ -76,13 +80,15 @@
#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
@@ -122,8 +128,16 @@ static SEGMENT Segment[128] = {{ len1:0, len2:0, type:255, used:0, ascii:32
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));
@@ -349,6 +363,8 @@ int MO_clear (void)
return 0;
}
+static void MO_quit (int signal); //forward decvlaration
+
int MO_init (LCD *Self)
{
char *port;
@@ -391,6 +407,10 @@ int MO_init (LCD *Self)
Device=MO_open();
if (Device==-1) return -1;
+ signal(SIGINT, MO_quit);
+ signal(SIGQUIT, MO_quit);
+ signal(SIGTERM, MO_quit);
+
MO_clear();
MO_contrast();
@@ -522,6 +542,14 @@ int MO_flush (void)
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 },