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#include "modem.h"
#include "lock.h"
/* Baudrate for the TTY. Should be greater the 64000. */
#define BAUD_RATE B115200
struct modem *modem_open(const char *dev) {
struct modem *m;
int fd = -1, n;
struct termios ts, ts2;
assert(dev);
if (device_lock(dev) != 0)
return -1;
if ((fd = open(dev, O_RDWR|O_NDELAY)) < 0) {
daemon_log(LOG_ERR, "Failed to open device <%s>: %s", dev, strerror(errno));
goto fail;
}
if ((n = fcntl(fd, F_GETFL, 0)) < 0 || fcntl(fd, F_SETFL, n & ~O_NDELAY) < 0) {
daemon_log(LOG_ERR, "Failed to remove O_NDELAY flag from device: %s", strerror(errno));
goto fail;
}
memset(&ts, 0, sizeof ts);
ts.c_cflag = CRTSCTS | IGNPAR | HUPCL | CS8;
ts.c_iflag = IGNPAR;
ts.c_oflag = 0;
ts.c_lflag = 0;
ts.c_cc[VMIN] = 1;
ts.c_cc[VTIME] = 0;
cfsetospeed(&ts, BAUD_RATE);
cfsetispeed(&ts, BAUD_RATE);
tcflush(fd, TCIFLUSH);
if (tcsetattr(fd, TCSANOW, &ts) < 0) {
daemon_log(LOG_ERR, "Failed to set TTY attributes: %s", strerror(errno));
goto fail;
}
if (tcgetattr(fd, &ts2) < 0 || memcmp(&ts, &ts2) != 0) {
daemon_log(LOG_ERR, "Failed to set TTY attributes");
goto fail;
}
m = malloc(sizeof(struct modem));
assert(m);
memset(m, 0, sizeof(struct modem));
m->dev = strdup(dev);
assert(m->dev);
m->fd = fd;
m->state = MODEM_STATE_INIT;
m->child_pid = -1;
return m;
fail:
if (fd >= 0)
close(fd);
device_unlock(dev);
return NULL;
}
void modem_close(struct modem *m) {
assert(m);
if (m->child_pid != -1)
child_process_kill(m->child_pid);
close(m->fd);
device_unlock(m->dev);
free(m->dev);
free(m);
}
static int modem_read(struct modem *m) {
char *p;
ssize_t s;
assert(m && m->input_buf);
p = m->input_buf+m->input_buf_len;
if ((s = read(m->fd, &p, MODEM_BUF_LEN-m->input_buf_len)) <= 0) {
daemon_log(LOG_ERR, "Failed to read() from modem: %s", !s ? "EOF" : strerror(errno));
return -1;
}
m->input_buf_len += s;
}
static void* oop_timeout_cb(oop_source *source,struct timeval tv,void *user) {
struct modem *m = (struct modem*) user;
assert(source && user);
daemon_log(LOG_ERR, "Timeout reached for device <%s>", m->device);
return OOP_HALT;
}
static void modem_timeout(struct modem *m, int t) {
struct timeval tv = { t, 0 };
assert(m);
assert(event_source && event_source->on_time);
event_source->cancel_time(event_source, m->timeout, oop_timeout_cb, m);
if (t > 0) {
gettimeofday(&m->timeout);
m->tv_sec += t;
assert(event_source && event_source->on_time);
event_source->on_time(event_source, m->timeout, oop_timeout_cb, m);
}
}
static void* oop_init_cb(oop_source *source, int fd, oop_event event, void *user) {
struct modem *m = (struct modem*) user;
assert(source && user);
assert(m && m->fd == fd && m->mode == MODEM_STATE_INIT);
if (event == OOP_READ) {
if (modem_read(m) < 0)
return OOP_HALT;
} else if (event == OOP_WRITE) {
modem_write(m);
}
return OOP_CONTINUE;
}
static void* oop_audio_simple_cb(oop_source *source, int fd, oop_event event, void *user) {
struct modem *m = (struct modem*) user;
assert(source && user);
assert(m && m->mode == MODEM_STATE_AUDIO_SIMPLE);
if (event == OOP_READ) {
modem_read(m);
} else if (event == OOP_WRITE) {
modem_write(m);
}
return OOP_CONTINUE;
}
static void* oop_audio_shbuf_cb(oop_source *source, int fd, oop_event event, void *user) {
struct modem *m = (struct modem*) user;
assert(source && user);
assert(m && m->mode == MODEM_STATE_AUDIO_SHBUF);
if (event == OOP_READ) {
modem_read(m);
} else if (event == OOP_WRITE) {
modem_write(m);
}
return OOP_CONTINUE;
}
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