/*
* Simple serial terminal
*
- * Copyright 2014, 2015, 2016 Michal Sojka <sojkam1@fel.cvut.cz>
+ * Copyright 2014, 2015, 2016, 2017, 2019 Michal Sojka <sojkam1@fel.cvut.cz>
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
#define _BSD_SOURCE
#define _DEFAULT_SOURCE
+#define _GNU_SOURCE
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdbool.h>
#include <string.h>
#include <signal.h>
+#ifdef HAVE_LOCKDEV
#include <lockdev.h>
+#endif
+#include <sys/file.h>
+#include <errno.h>
#define STRINGIFY(val) #val
#define TOSTRING(val) STRINGIFY(val)
tcsetattr(0, TCSANOW, &stdin_tio_backup);
}
+#ifdef HAVE_LOCKDEV
void unlock()
{
dev_unlock(dev, getpid());
}
+#endif
void sighandler(int arg)
{
fprintf(stderr, "Usage: %s [options] <device>\n", argv0);
fprintf(stderr,
"Options:\n"
+ " -b <duration> send break signal\n"
" -c enter command mode\n"
" -d[PULSE] make pulse on DTR\n"
" -e ignore '~.' escape sequence\n"
" -n do not switch the device to raw mode\n"
" -r[PULSE] make pulse on RTS\n"
" -s <baudrate>\n"
+ " -v verbose mode\n"
"\n"
"PULSE is a number specifying the pulse. Absolute value defines the\n"
"length of the pulse in milliseconds, sign determines the polarity of\n"
while (!go) {
char *p1 = NULL;
+ int num;
if (fgets(command, sizeof(command), stdin) == NULL) {
if (!feof(stdin))
perror("Command read");
pulse(fd, dtr_rts_arg('d', p1), 0);
else if (sscanf(command, "rts %ms", &p1) == 1)
pulse(fd, 0, dtr_rts_arg('r', p1));
+ else if (sscanf(command, "break %d", &num) == 1)
+ CHECK(tcsendbreak(fd, num));
else if (strcmp(command, "go\n") == 0)
break;
+ else if (strcmp(command, "exit\n") == 0)
+ exit(0);
else {
fprintf(stderr, "Unknown command: %s\n", command);
exit(1);
bool stdin_tty;
bool raw = true;
bool cmd = false;
+ int break_dur = -1;
if ((stdin_tty = isatty(0))) {
CHECK(tcgetattr(0, &stdin_tio_backup));
atexit(restore_stdin_term);
}
- while ((opt = getopt(argc, argv, "cnd::er::s:v")) != -1) {
+ while ((opt = getopt(argc, argv, "b:cnd::er::s:v")) != -1) {
switch (opt) {
+ case 'b': break_dur = atoi(optarg); break;
case 'c': cmd = true; break;
case 'd': dtr = dtr_rts_arg(opt, optarg); break;
case 'e': exit_on_escape = false; break;
signal(SIGTERM, sighandler);
signal(SIGHUP, sighandler);
+#ifdef HAVE_LOCKDEV
pid_t pid = dev_lock(dev);
if (pid > 0) {
fprintf(stderr, "%s is used by PID %d\n", dev, pid);
exit(1);
} else if (pid < 0) {
- perror("dev_lock()");
+ char *msg;
+ asprintf(&msg, "dev_lock('%s')", dev); /* No free() because we exit() immediately */
+ if (errno)
+ perror(msg);
+ else
+ fprintf(stderr, "%s: Error\n", msg);
exit(1);
}
atexit(unlock);
+#endif
/* O_NONBLOCK is needed to not wait for the CDC signal. See tty_ioctl(4). */
if ((fd = open(dev, O_RDWR|O_NOCTTY|O_NONBLOCK)) < 0) {
int n = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, n & ~O_NDELAY);
+ flock(fd, LOCK_EX);
+
if (isatty(fd)) {
CHECK(ioctl(fd, TIOCEXCL, NULL));
if (dtr || rts)
pulse(fd, dtr, rts);
+ if (break_dur != -1)
+ CHECK(tcsendbreak(fd, break_dur));
+
/* Disable flow control */
tio.c_cflag &= ~(CRTSCTS);
tio.c_iflag &= ~(IXON|IXOFF);
exit(1);
}
}
+ if (fds[0].revents & POLLHUP) {
+ VERBOSE("HUP on stdin\r\n");
+ break;
+ }
if (fds[1].revents & POLLIN) {
r1 = CHECK(read(fd, buf, sizeof(buf)));
if (r1 == 0) {