| /* 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); |
| } |
| } |
| } |