diff options
| -rw-r--r-- | bin/man1/modem.1 | 14 | ||||
| -rw-r--r-- | bin/modem.c | 29 |
2 files changed, 28 insertions, 15 deletions
diff --git a/bin/man1/modem.1 b/bin/man1/modem.1 index 522242b3..a4bbc3f1 100644 --- a/bin/man1/modem.1 +++ b/bin/man1/modem.1 @@ -1,4 +1,4 @@ -.Dd July 8, 2019 +.Dd December 8, 2020 .Dt MODEM 1 .Os . @@ -8,6 +8,7 @@ . .Sh SYNOPSIS .Nm +.Op Fl r Ar rate .Ar command ... . .Sh DESCRIPTION @@ -15,8 +16,15 @@ runs the .Ar command in a new PTY -with a fixed baud rate -of 19.2 kbps. +with a fixed baud rate. +. +.Pp +The arguments are as follows: +.Bl -tag -width Ds +.It Fl r Ar rate +Set the baud rate. +The default is 19200. +.El . .Sh BUGS Window size changes are not propagated diff --git a/bin/modem.c b/bin/modem.c index a003506f..2133ae08 100644 --- a/bin/modem.c +++ b/bin/modem.c @@ -34,8 +34,6 @@ typedef unsigned uint; typedef unsigned char byte; -static const uint BaudRate = 19200; - static struct termios saveTerm; static void restoreTerm(void) { tcsetattr(STDIN_FILENO, TCSADRAIN, &saveTerm); @@ -44,7 +42,14 @@ static void restoreTerm(void) { int main(int argc, char *argv[]) { int error; - if (argc < 2) return EX_USAGE; + uint baudRate = 19200; + for (int opt; 0 < (opt = getopt(argc, argv, "r:"));) { + switch (opt) { + break; case 'r': baudRate = strtoul(optarg, NULL, 10); + break; default: return EX_USAGE; + } + } + if (argc - optind < 1) return EX_USAGE; error = tcgetattr(STDIN_FILENO, &saveTerm); if (error) err(EX_IOERR, "tcgetattr"); @@ -64,8 +69,8 @@ int main(int argc, char *argv[]) { if (pid < 0) err(EX_OSERR, "forkpty"); if (!pid) { - execvp(argv[1], &argv[1]); - err(EX_NOINPUT, "%s", argv[1]); + execvp(argv[optind], &argv[optind]); + err(EX_NOINPUT, "%s", argv[optind]); } byte c; @@ -73,7 +78,7 @@ int main(int argc, char *argv[]) { { .events = POLLIN, .fd = STDIN_FILENO }, { .events = POLLIN, .fd = pty }, }; - while (usleep(8 * 1000000 / BaudRate), 0 < poll(fds, 2, -1)) { + while (usleep(8 * 1000000 / baudRate), 0 < poll(fds, 2, -1)) { if (fds[0].revents) { ssize_t size = read(STDIN_FILENO, &c, 1); if (size < 0) err(EX_IOERR, "read(%d)", STDIN_FILENO); @@ -84,14 +89,14 @@ int main(int argc, char *argv[]) { if (fds[1].revents) { ssize_t size = read(pty, &c, 1); if (size < 0) err(EX_IOERR, "read(%d)", pty); + if (!size) break; size = write(STDOUT_FILENO, &c, 1); if (size < 0) err(EX_IOERR, "write(%d)", STDOUT_FILENO); } - - int status; - pid_t dead = waitpid(pid, &status, WNOHANG); - if (dead < 0) err(EX_OSERR, "waitpid"); - if (dead) return WIFEXITED(status) ? WEXITSTATUS(status) : EX_SOFTWARE; } - err(EX_IOERR, "poll"); + + int status; + pid_t dead = waitpid(pid, &status, 0); + if (dead < 0) err(EX_OSERR, "waitpid"); + return WIFEXITED(status) ? WEXITSTATUS(status) : EX_SOFTWARE; } |