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707669501

Denis Vlasenko

2007-09-21

FAILED Duration: 15s

Subject

microcom: add new applet, this time for real

Binary

No binary (build failed)

Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

—

Build Log

(log yok)

Commit Diff GitHub →

util-linux/microcom.c +135 -0

util-linux/microcom.c+135 -0

@@ -0,0 +1,135 @@
+	/* microcom.c
+	*
+	* bare bones 'talk to modem' program - similar to 'cu -l $device'
+	* inspired by mgetty's microcom
+	*
+	*/
+	#include "busybox.h"
+
+	int microcom_main(int argc, char **argv);
+	int microcom_main(int argc, char **argv)
+	{
+	struct pollfd pfd[2];
+	#define sfd (pfd[1].fd)
+	char *device_lock_file = NULL;
+	const char *s;
+	const char *opt_s = "9600";
+	unsigned speed;
+	int len;
+	int exitcode = 1;
+	struct termios tio0, tiosfd, tio;
+
+	getopt32(argv, "s:", &opt_s);
+	argc -= optind;
+	argv += optind;
+	if (!argv[0])
+	bb_show_usage();
+	speed = xatou(opt_s);
+
+	// try to create lock file in /var/lock
+	s = bb_basename(argv[0]);
+	if (!s[0]) {
+	errno = ENODEV;
+	bb_perror_msg_and_die("can't lock device");
+	}
+	device_lock_file = xasprintf("/var/lock/LCK..%s", s);
+	sfd = open(device_lock_file, O_CREAT \| O_WRONLY \| O_TRUNC \| O_EXCL, 0644);
+	if (sfd < 0) {
+	if (ENABLE_FEATURE_CLEAN_UP)
+	free(device_lock_file);
+	device_lock_file = NULL;
+	if (errno == EEXIST)
+	bb_perror_msg_and_die("can't lock device");
+	// We don't abort on other errors: /var/lock can be
+	// non-writable or non-existent
+	} else {
+	// %4d to make mgetty happy. It treats 4-bytes lock files as binary,
+	// not text, PID. Making 5+ char file. Brrr...
+	s = xasprintf("%4d\n", getpid());
+	write(sfd, s, strlen(s));
+	if (ENABLE_FEATURE_CLEAN_UP)
+	free((char*)s);
+	close(sfd);
+	}
+
+	// open device
+	sfd = open(argv[0], O_RDWR \| O_NDELAY);
+	if (sfd < 0) {
+	bb_perror_msg("can't open device");
+	goto unlock_and_exit;
+	}
+	fcntl(sfd, F_SETFL, O_RDWR); // why?
+
+	// put stdin to "raw mode", handle one character at a time
+	tcgetattr(STDIN_FILENO, &tio0);
+	tio = tio0;
+	tio.c_lflag &= ~(ICANON\|ECHO);
+	tio.c_iflag &= ~(IXON\|ICRNL);
+	tio.c_oflag &= ~(ONLCR);
+	tio.c_cc[VMIN] = 1;
+	tio.c_cc[VTIME] = 0;
+	if (tcsetattr(STDIN_FILENO, TCSANOW, &tio)) {
+	bb_perror_msg("can't tcsetattr for %s", "stdin");
+	goto unlock_and_exit;
+	}
+
+	/* same thing for modem (plus: set baud rate) - TODO: make CLI option */
+	tcgetattr(sfd, &tiosfd);
+	tio = tiosfd;
+	tio.c_lflag &= ~(ICANON\|ECHO);
+	tio.c_iflag &= ~(IXON\|ICRNL);
+	tio.c_oflag &= ~(ONLCR);
+	tio.c_cc[VMIN] = 1;
+	tio.c_cc[VTIME] = 0;
+	cfsetispeed(&tio, tty_value_to_baud(speed));
+	cfsetospeed(&tio, tty_value_to_baud(speed));
+	if (tcsetattr(sfd, TCSANOW, &tio)) {
+	bb_perror_msg("can't tcsetattr for %s", "device");
+	goto unlock_and_exit;
+	}
+
+	// disable SIGINT
+	signal(SIGINT, SIG_IGN);
+
+	// drain stdin
+	tcflush(STDIN_FILENO, TCIFLUSH);
+	printf("connected to '%s' (%d bps), exit with ctrl-X...\r\n", argv[0], speed);
+
+	// main loop: check with poll(), then read/write bytes across
+	pfd[0].fd = STDIN_FILENO;
+	pfd[0].events = POLLIN;
+	/pfd[1].fd = sfd;/
+	pfd[1].events = POLLIN;
+	while (1) {
+	int i;
+	while (-1 == poll(pfd, 2, -1) && EINTR == errno)
+	continue;
+	for (i = 0; i < 2; ++i) {
+	if (pfd[i].revents & POLLIN) {
+	len = read(pfd[i].fd, bb_common_bufsiz1, COMMON_BUFSIZE);
+	if (len > 0) {
+	if (!i && 24 == bb_common_bufsiz1[0])
+	goto done; // ^X exits
+	write(pfd[1-i].fd, bb_common_bufsiz1, len);
+	}
+	}
+	}
+	}
+	done:
+	tcsetattr(sfd, TCSANOW, &tiosfd);
+	tcsetattr(STDIN_FILENO, TCSANOW, &tio0);
+	tcflush(STDIN_FILENO, TCIFLUSH);
+
+	if (ENABLE_FEATURE_CLEAN_UP)
+	close(sfd);
+	exitcode = 0;
+
+	unlock_and_exit:
+	// delete lock file
+	if (device_lock_file) {
+	unlink(device_lock_file);
+	if (ENABLE_FEATURE_CLEAN_UP)
+	free(device_lock_file);
+	}
+	return exitcode;
+	}