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- /* microcom.c - Simple serial console.
- *
- * Copyright 2017 The Android Open Source Project.
- USE_MICROCOM(NEWTOY(microcom, "<1>1s#=115200X", 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 (default 115200)
- -X Ignore ^@ (send break) and ^] (exit)
- */
- #define FOR_microcom
- #include "toys.h"
- GLOBALS(
- long s;
- int fd, stok;
- struct termios old_stdin, old_fd;
- )
- // TODO: tty_sigreset outputs ansi escape sequences, how to disable?
- static void restore_states(int i)
- {
- if (TT.stok) tcsetattr(0, TCSAFLUSH, &TT.old_stdin);
- tcsetattr(TT.fd, TCSAFLUSH, &TT.old_fd);
- }
- void microcom_main(void)
- {
- struct termios tio;
- struct pollfd fds[2];
- int i;
- // 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)
- || tcgetattr(TT.fd, &TT.old_fd))
- perror_exit_raw(*toys.optargs);
- // Set both input and output to raw mode.
- memcpy(&tio, &TT.old_fd, sizeof(struct termios));
- cfmakeraw(&tio);
- xsetspeed(&tio, TT.s);
- if (tcsetattr(TT.fd, TCSAFLUSH, &tio)) perror_exit("set speed");
- if (!set_terminal(0, 1, 0, &TT.old_stdin)) TT.stok++;
- // ...and arrange to restore things, however we may exit.
- sigatexit(restore_states);
- fds[0].fd = TT.fd;
- fds[1].fd = 0;
- fds[0].events = fds[1].events = POLLIN;
- while (poll(fds, 2, -1) > 0) {
- // Read from connection, write to stdout.
- if (fds[0].revents) {
- if (0 < (i = read(TT.fd, toybuf, sizeof(toybuf)))) xwrite(0, toybuf, i);
- else break;
- }
- // Read from stdin, write to connection.
- if (fds[1].revents) {
- if (read(0, toybuf, 1) != 1) break;
- if (!FLAG(X)) {
- if (!*toybuf) {
- tcsendbreak(TT.fd, 0);
- continue;
- } else if (*toybuf == (']'-'@')) break;
- }
- xwrite(TT.fd, toybuf, 1);
- }
- }
- }
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