restore serial port settings on exit

[sball] / src / sball.c

diff --git a/src/sball.c b/src/sball.c
index 4b03040..9dce2ae 100644 (file)
--- a/src/sball.c
+++ b/src/sball.c
@@ -4,12 +4,12 @@
 #include <ctype.h>
 #include <time.h>
 #include <errno.h>
-#include <alloca.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <termios.h>
 #include <sys/select.h>
 #include <sys/time.h>
+#include <sys/ioctl.h>
 
 #define INP_BUF_SZ     256
 
@@ -29,11 +29,16 @@ struct sball {
        short mot[6];
        unsigned int keystate;
 
+       struct termios saved_term;
+       int saved_mstat;
+
        int (*parse)(struct sball*, int, char*, int);
 };
 
-static int stty_sball(int fd);
-static int stty_mag(int fd);
+static int stty_sball(struct sball *sb);
+static int stty_mag(struct sball *sb);
+static void stty_save(struct sball *sb);
+static void stty_restore(struct sball *sb);
 
 static int proc_input(struct sball *sb);
 
@@ -54,7 +59,7 @@ struct sball *sball_open(const char *dev)
        char buf[128];
        struct sball *sb = 0;
 
-       if((fd = open(dev, O_RDWR | O_NOCTTY)) == -1) {
+       if((fd = open(dev, O_RDWR | O_NOCTTY | O_NONBLOCK)) == -1) {
                fprintf(stderr, "sball_open: failed to open device: %s: %s\n", dev, strerror(errno));
                return 0;
        }
@@ -67,11 +72,14 @@ struct sball *sball_open(const char *dev)
        sb->flags = 0;
        sb->len = 0;
 
-       if(stty_sball(fd) == -1) {
+       stty_save(sb);
+
+       if(stty_sball(sb) == -1) {
                goto err;
        }
+       write(fd, "\r@RESET\r", 8);
 
-       if((sz = read_timeout(fd, buf, sizeof buf - 1, 2000000)) > 0 && memcmp(buf, "\r@1", 3) == 0) {
+       if((sz = read_timeout(fd, buf, sizeof buf - 1, 2000000)) > 0 && strstr(buf, "\r@1")) {
                /* we got a response, so it's a spaceball */
                make_printable(buf, sz);
                printf("Spaceball detected: %s\n", buf);
@@ -80,14 +88,14 @@ struct sball *sball_open(const char *dev)
                printf("%d buttons\n", sb->nbuttons);
 
                /* set binary mode and enable automatic data packet sending */
-               write(fd, "\rCB\rMSS\r", 8);
+               write(fd, "\rCB\rMSSV\r", 9);
 
                sb->parse = sball_parsepkt;
                return sb;
        }
 
        /* try as a magellan spacemouse */
-       if(stty_mag(fd) == -1) {
+       if(stty_mag(sb) == -1) {
                goto err;
        }
        write(fd, "vQ\r", 3);
@@ -107,6 +115,7 @@ struct sball *sball_open(const char *dev)
        }
 
 err:
+       stty_restore(sb);
        close(fd);
        free(sb);
        return 0;
@@ -115,6 +124,8 @@ err:
 void sball_close(struct sball *sb)
 {
        if(!sb) return;
+
+       stty_restore(sb);
        close(sb->fd);
 }
 
@@ -159,48 +170,55 @@ int sball_num_buttons(struct sball *sb)
 }
 
 /* Labtec spaceball: 9600 8n1 XON/XOFF */
-static int stty_sball(int fd)
+static int stty_sball(struct sball *sb)
 {
+       int mstat;
        struct termios term;
 
-       if(tcgetattr(fd, &term) == -1) {
-               perror("sball_open: tcgetattr");
-               return -1;
-       }
-
+       term = sb->saved_term;
        term.c_oflag = 0;
-       term.c_lflag = 0;
+       term.c_lflag = ICANON;
        term.c_cc[VMIN] = 0;
-       term.c_cc[VTIME] = 1;
+       term.c_cc[VTIME] = 0;
+       term.c_cc[VEOF] = 0;
+       term.c_cc[VEOL] = '\r';
+       term.c_cc[VEOL2] = 0;
+       term.c_cc[VERASE] = 0;
+       term.c_cc[VKILL] = 0;
 
        term.c_cflag = CLOCAL | CREAD | CS8 | HUPCL;
-       term.c_iflag = IGNBRK | IGNPAR | IXON | IXOFF;
+       term.c_iflag = IGNBRK | IGNPAR;
 
        cfsetispeed(&term, B9600);
        cfsetospeed(&term, B9600);
 
-       if(tcsetattr(fd, TCSANOW, &term) == -1) {
+       if(tcsetattr(sb->fd, TCSAFLUSH, &term) == -1) {
                perror("sball_open: tcsetattr");
                return -1;
        }
+       tcflush(sb->fd, TCIOFLUSH);
 
+       mstat = sb->saved_mstat | TIOCM_DTR | TIOCM_RTS;
+       ioctl(sb->fd, TIOCMGET, &mstat);
        return 0;
 }
 
 /* Logicad magellan spacemouse: 9600 8n2 CTS/RTS */
-static int stty_mag(int fd)
+static int stty_mag(struct sball *sb)
 {
+       int mstat;
        struct termios term;
 
-       if(tcgetattr(fd, &term) == -1) {
-               perror("sball_open: tcgetattr");
-               return -1;
-       }
-
+       term = sb->saved_term;
        term.c_oflag = 0;
-       term.c_lflag = 0;
+       term.c_lflag = ICANON;
        term.c_cc[VMIN] = 0;
-       term.c_cc[VTIME] = 1;
+       term.c_cc[VTIME] = 0;
+       term.c_cc[VEOF] = 0;
+       term.c_cc[VEOL] = '\r';
+       term.c_cc[VEOL2] = 0;
+       term.c_cc[VERASE] = 0;
+       term.c_cc[VKILL] = 0;
 
        term.c_cflag = CLOCAL | CREAD | CS8 | CSTOPB | HUPCL | CRTSCTS;
        term.c_iflag = IGNBRK | IGNPAR;
@@ -208,14 +226,30 @@ static int stty_mag(int fd)
        cfsetispeed(&term, B9600);
        cfsetospeed(&term, B9600);
 
-       if(tcsetattr(fd, TCSANOW, &term) == -1) {
+       if(tcsetattr(sb->fd, TCSAFLUSH, &term) == -1) {
                perror("sball_open: tcsetattr");
                return -1;
        }
+       tcflush(sb->fd, TCIOFLUSH);
 
+       mstat = sb->saved_mstat | TIOCM_DTR | TIOCM_RTS;
+       ioctl(sb->fd, TIOCMGET, &mstat);
        return 0;
 }
 
+static void stty_save(struct sball *sb)
+{
+       tcgetattr(sb->fd, &sb->saved_term);
+       ioctl(sb->fd, TIOCMGET, &sb->saved_mstat);
+}
+
+static void stty_restore(struct sball *sb)
+{
+       tcsetattr(sb->fd, TCSAFLUSH, &sb->saved_term);
+       tcflush(sb->fd, TCIOFLUSH);
+       ioctl(sb->fd, TIOCMSET, &sb->saved_mstat);
+}
+
 
 static int proc_input(struct sball *sb)
 {