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