*
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
*
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-#include "libbb.h"
-/* All known arches use small ints for signals */
-static volatile smallint signalled;
+//usage:#define microcom_trivial_usage
+//usage: "[-d DELAY] [-t TIMEOUT] [-s SPEED] [-X] TTY"
+//usage:#define microcom_full_usage "\n\n"
+//usage: "Copy bytes for stdin to TTY and from TTY to stdout\n"
+//usage: "\n -d Wait up to DELAY ms for TTY output before sending every"
+//usage: "\n next byte to it"
+//usage: "\n -t Exit if both stdin and TTY are silent for TIMEOUT ms"
+//usage: "\n -s Set serial line to SPEED"
+//usage: "\n -X Disable special meaning of NUL and Ctrl-X from stdin"
-static void signal_handler(int signo)
-{
- signalled = signo;
-}
+#include "libbb.h"
// set raw tty mode
static void xget1(int fd, struct termios *t, struct termios *oldt)
}
int microcom_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int microcom_main(int argc, char **argv)
+int microcom_main(int argc UNUSED_PARAM, char **argv)
{
int sfd;
int nfd;
if (sfd < 0) {
// device already locked -> bail out
if (errno == EEXIST)
- bb_perror_msg_and_die("can't create %s", device_lock_file);
+ bb_perror_msg_and_die("can't create '%s'", device_lock_file);
// can't create lock -> don't care
if (ENABLE_FEATURE_CLEAN_UP)
free(device_lock_file);
// %4d to make concurrent mgetty (if any) happy.
// Mgetty treats 4-bytes lock files as binary,
// not text, PID. Making 5+ char file. Brrr...
- char *s = xasprintf("%4d\n", getpid());
- write(sfd, s, strlen(s));
- if (ENABLE_FEATURE_CLEAN_UP)
- free(s);
+ fdprintf(sfd, "%4d\n", getpid());
close(sfd);
}
+ (1 << SIGINT)
+ (1 << SIGTERM)
+ (1 << SIGPIPE)
- , signal_handler);
+ , record_signo);
// error exit code if we fail to open the device
- signalled = 1;
-
- // put stdin to "raw mode" (if stdin is a TTY),
- // handle one character at a time
- if (isatty(STDIN_FILENO)) {
- xget1(STDIN_FILENO, &tio, &tio0);
- if (xset1(STDIN_FILENO, &tio, "stdin"))
- goto done;
- }
+ bb_got_signal = 1;
// open device
sfd = open_or_warn(argv[0], O_RDWR | O_NOCTTY | O_NONBLOCK);
if (sfd < 0)
goto done;
- fcntl(sfd, F_SETFL, 0);
+ fcntl(sfd, F_SETFL, O_RDWR);
// put device to "raw mode"
xget1(sfd, &tio, &tiosfd);
-// tio.c_cflag |= (CREAD|HUPCL); // we just bail out on any device error
// set device speed
cfsetspeed(&tio, tty_value_to_baud(speed));
if (xset1(sfd, &tio, argv[0]))
- goto restore0_and_done;
+ goto done;
+
+ // put stdin to "raw mode" (if stdin is a TTY),
+ // handle one character at a time
+ if (isatty(STDIN_FILENO)) {
+ xget1(STDIN_FILENO, &tio, &tio0);
+ if (xset1(STDIN_FILENO, &tio, "stdin"))
+ goto done;
+ }
// main loop: check with poll(), then read/write bytes across
pfd[0].fd = sfd;
pfd[1].fd = STDIN_FILENO;
pfd[1].events = POLLIN;
- signalled = 0;
+ bb_got_signal = 0;
nfd = 2;
- while (!signalled && safe_poll(pfd, nfd, timeout) > 0) {
+ // Not safe_poll: we want to exit on signal
+ while (!bb_got_signal && poll(pfd, nfd, timeout) > 0) {
if (nfd > 1 && pfd[1].revents) {
char c;
// read from stdin -> write to device
full_write(STDOUT_FILENO, iobuf, len);
else {
// EOF/error -> bail out
- signalled = SIGHUP;
+ bb_got_signal = SIGHUP;
break;
}
}
// restore device mode
tcsetattr(sfd, TCSAFLUSH, &tiosfd);
-restore0_and_done:
if (isatty(STDIN_FILENO))
tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio0);
if (device_lock_file)
unlink(device_lock_file);
- return signalled;
+ return bb_got_signal;
}