Better way to deal with the signals, tell the terminal not to send them.

1 files changed, 33 insertions, 4 deletions

diff --git a/boxes.c b/boxes.c
index 3a09858..fc429fc 100644
--- a/boxes.c
+++ b/boxes.c
@@ -2805,13 +2805,42 @@ void boxes_main(void)
     ECHOK       If ICANON is also set, the KILL character erases the current line. 
     ECHONL      If ICANON is also set, echo the NL character even if ECHO is not set. 
     TOSTOP      Send the SIGTTOU signal to the process group of a background process which tries to write to its controlling terminal.
-    ICANON      Enable canonical mode. This enables the special characters EOF, EOL, EOL2, ERASE, KILL, LNEXT, REPRINT, STATUS, and WERASE, and buffers by lines. 
+    ICANON      Enable canonical mode. This enables the special characters EOF, EOL, EOL2, ERASE, KILL, LNEXT, REPRINT, STATUS, and WERASE, and buffers by lines.
 
-    VTIME       Timeout in deciseconds for non-canonical read. 
+    VTIME       Timeout in deciseconds for non-canonical read.
     VMIN        Minimum number of characters for non-canonical read.
+
+    raw mode  turning off ICANON, IEXTEN, and ISIG kills most special key processing.
+       termio.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+       termio.c_oflag &= ~OPOST;
+       termio.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+       termio.c_cflag &= ~(CSIZE | PARENB);
+       termio.c_cflag |= CS8;
+
+    IGNBRK      ignore BREAK
+    BRKINT      complicated, bet in this context, sends BREAK as '\x00'
+    PARMRK      characters with parity or frame erors are sent as '\x00'
+    ISTRIP      strip 8th byte
+    INLCR       translate LF to CR in input
+    IGLCR       ignore CR
+    OPOST       enable implementation defined output processing
+    ISIG        generate signals on INTR (SIGINT on ^C), QUIT (SIGQUIT on ^\\), SUSP (SIGTSTP on ^Z), DSUSP (SIGTSTP on ^Y)
+    IEXTEN      enable implementation defined input processing, turns on some key -> signal -tuff
+    CSIZE       mask for character sizes, so in this case, we mask them all out
+    PARENB      enable parity
+    CS8         8 bit characters
+
+    VEOF        "sends" EOF on ^D
+    VSTART      restart output on ^Q, IXON turns that on.
+    VSTATUS     display status info and sends SIGINFO on ^T.  Not in POSIX, not supported in Linux.  Does not seem to be any method of turning it off where it is supported.
+    VSTOP       stop output on ^S, IXON turns that on.
+
   */
-  termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
-  termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP|ICANON);
+  termio.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IUCLC | IXON | IXOFF | IXANY);
+  termio.c_oflag &= ~OPOST;
+  termio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL | TOSTOP | ICANON | ISIG | IEXTEN);
+  termio.c_cflag &= ~(CSIZE | PARENB);
+  termio.c_cflag |= CS8;
   termio.c_cc[VTIME]=0;  // deciseconds.
   termio.c_cc[VMIN]=1;
   tcsetattr(0, TCSANOW, &termio);