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/* microcom.c - Simple serial console.
*
* Copyright 2017 The Android Open Source Project.
USE_MICROCOM(NEWTOY(microcom, "<1>1s:X", TOYFLAG_USR|TOYFLAG_BIN))
config MICROCOM
bool "microcom"
default y
help
usage: microcom [-s SPEED] [-X] DEVICE
Simple serial console.
-s Set baud rate to SPEED
-X Ignore ^@ (send break) and ^] (exit)
*/
#define FOR_microcom
#include "toys.h"
GLOBALS(
char *s;
int fd;
struct termios original_stdin_state, original_fd_state;
)
// TODO: tty_sigreset outputs ansi escape sequences, how to disable?
static void restore_states(int i)
{
tcsetattr(0, TCSAFLUSH, &TT.original_stdin_state);
tcsetattr(TT.fd, TCSAFLUSH, &TT.original_fd_state);
}
void microcom_main(void)
{
struct pollfd fds[2];
int i, speed;
if (!TT.s) speed = 115200;
else speed = atoi(TT.s);
// Open with O_NDELAY, but switch back to blocking for reads.
TT.fd = xopen(*toys.optargs, O_RDWR | O_NOCTTY | O_NDELAY);
if (-1==(i = fcntl(TT.fd, F_GETFL, 0)) || fcntl(TT.fd, F_SETFL, i&~O_NDELAY))
perror_exit_raw(*toys.optargs);
// Set both input and output to raw mode.
xset_terminal(TT.fd, 1, speed, &TT.original_fd_state);
set_terminal(0, 1, 0, &TT.original_stdin_state);
// ...and arrange to restore things, however we may exit.
sigatexit(restore_states);
fds[0].fd = TT.fd;
fds[0].events = POLLIN;
fds[1].fd = 0;
fds[1].events = POLLIN;
while (poll(fds, 2, -1) > 0) {
char buf[BUFSIZ];
// Read from connection, write to stdout.
if (fds[0].revents) {
ssize_t n = read(TT.fd, buf, sizeof(buf));
if (n > 0) xwrite(0, buf, n);
else break;
}
// Read from stdin, write to connection.
if (fds[1].revents) {
if (read(0, buf, 1) != 1) break;
if (!(toys.optflags & FLAG_X)) {
if (!*buf) {
tcsendbreak(TT.fd, 0);
continue;
} else if (*buf == (']'-'@')) break;
}
xwrite(TT.fd, buf, 1);
}
}
}
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