diff options
Diffstat (limited to '')
| -rw-r--r-- | MatrixOrbital.c | 34 |
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 }, |