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D-Modem/slmodemd/modem_main.c

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/*
*
* Copyright (c) 2002, Smart Link Ltd.
* Copyright (c) 2021, Aon plc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. Neither the name of the Smart Link Ltd. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
*
* modem_main.c -- modem main func.
*
* Author: Sasha K (sashak@smlink.com)
*
*
*/
#define _GNU_SOURCE
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sched.h>
#include <signal.h>
#include <limits.h>
#include <grp.h>
#include <pwd.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define ENOIOCTLCMD 515
#ifdef SUPPORT_ALSA
#define ALSA_PCM_NEW_HW_PARAMS_API 1
#define ALSA_PCM_NEW_SW_PARAMS_API 1
#include <alsa/asoundlib.h>
/* buffer size in periods */
#define BUFFER_PERIODS 12
#define SHORT_BUFFER_PERIODS 4
#endif
#include <modem.h>
#include <modem_debug.h>
#define INFO(fmt,args...) fprintf(stderr, fmt , ##args );
#define ERR(fmt,args...) fprintf(stderr, "error: " fmt , ##args );
#define DBG(fmt,args...) dprintf("main: " fmt, ##args)
//#define SLMODEMD_USER "nobody"
#define LOCKED_MEM_MIN_KB (8UL * 1024)
#define LOCKED_MEM_MIN (LOCKED_MEM_MIN_KB * 1024)
#define CLOSE_COUNT_MAX 100
/* modem init externals : FIXME remove it */
extern int dp_dummy_init(void);
extern void dp_dummy_exit(void);
extern int dp_sinus_init(void);
extern void dp_sinus_exit(void);
extern int prop_dp_init(void);
extern void prop_dp_exit(void);
extern int datafile_load_info(char *name,struct dsp_info *info);
extern int datafile_save_info(char *name,struct dsp_info *info);
extern int modem_ring_detector_start(struct modem *m);
/* global config data */
extern const char *modem_dev_name;
extern unsigned int ring_detector;
extern unsigned int need_realtime;
extern const char *modem_group;
extern mode_t modem_perm;
extern unsigned int use_short_buffer;
extern const char *modem_exec;
struct device_struct {
int num;
int fd;
#ifdef SUPPORT_ALSA
snd_pcm_t *phandle;
snd_pcm_t *chandle;
snd_mixer_t *mhandle;
snd_mixer_elem_t *hook_off_elem;
snd_mixer_elem_t *cid_elem;
snd_mixer_elem_t *speaker_elem;
unsigned int period;
unsigned int buf_periods;
unsigned int started;
#endif
int delay;
};
static char inbuf[4096];
static char outbuf[4096];
/*
* ALSA 'driver'
*
*/
#ifdef SUPPORT_ALSA
#define INTERNAL_DELAY 40 /* internal device tx/rx delay: should be selfdetectible */
extern unsigned use_alsa;
static snd_output_t *dbg_out = NULL;
static int alsa_mixer_setup(struct device_struct *dev, const char *dev_name)
{
char card_name[32];
int card_num = 0;
char *p;
snd_mixer_elem_t *elem;
int err;
if((p = strchr(dev_name, ':')))
card_num = strtoul(p+1, NULL, 0);
sprintf(card_name, "hw:%d", card_num);
err = snd_mixer_open(&dev->mhandle, 0);
if(err < 0) {
DBG("mixer setup: cannot open: %s\n", snd_strerror(err));
return err;
}
err = snd_mixer_attach(dev->mhandle, card_name);
if (err < 0) {
ERR("mixer setup: attach %s error: %s\n", card_name, snd_strerror(err));
goto error;
}
err = snd_mixer_selem_register(dev->mhandle, NULL, NULL);
if (err <0) {
ERR("mixer setup: register %s error: %s\n", card_name, snd_strerror(err));
goto error;
}
err = snd_mixer_load(dev->mhandle);
if (err < 0) {
ERR("mixer setup: load %s error: %s\n", card_name, snd_strerror(err));
goto error;
}
for (elem = snd_mixer_first_elem(dev->mhandle) ; elem; elem = snd_mixer_elem_next(elem)) {
if(strcmp(snd_mixer_selem_get_name(elem),"Off-hook") == 0)
dev->hook_off_elem = elem;
else if(strcmp(snd_mixer_selem_get_name(elem),"Caller ID") == 0)
dev->cid_elem = elem;
else if(strcmp(snd_mixer_selem_get_name(elem),"Modem Speaker") == 0)
dev->speaker_elem = elem;
}
if(dev->hook_off_elem)
return 0;
error:
snd_mixer_close(dev->mhandle);
dev->mhandle = NULL;
if (!err) {
ERR("mixer setup: Off-hook switch not found for card %s\n", card_name);
err = -ENODEV;
}
return err;
}
static int alsa_device_setup(struct device_struct *dev, const char *dev_name)
{
struct pollfd pfd;
int ret;
memset(dev,0,sizeof(*dev));
ret = alsa_mixer_setup(dev, dev_name);
if(ret < 0)
DBG("alsa setup: cannot setup mixer: %s\n", snd_strerror(ret));
ret = snd_pcm_open(&dev->phandle, dev_name, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
if(ret < 0) {
ERR("alsa setup: cannot open playback device '%s': %s\n",
dev_name, snd_strerror(ret));
return -1;
}
ret = snd_pcm_open(&dev->chandle, dev_name, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
if(ret < 0) {
ERR("alsa setup: cannot open playback device '%s': %s\n",
dev_name, snd_strerror(ret));
return -1;
}
ret = snd_pcm_poll_descriptors(dev->chandle, &pfd, 1);
if(ret <= 0) {
ERR("alsa setup: cannot get poll descriptors of '%s': %s\n",
dev_name, snd_strerror(ret));
return -1;
}
dev->fd = pfd.fd;
dev->num = 0; /* <-- FIXME */
if(modem_debug_level > 0)
snd_output_stdio_attach(&dbg_out,stderr,0);
return 0;
}
static int alsa_device_release(struct device_struct *dev)
{
snd_pcm_close (dev->phandle);
snd_pcm_close (dev->chandle);
if (dev->mhandle) {
if (dev->hook_off_elem)
snd_mixer_selem_set_playback_switch_all(dev->hook_off_elem, 0);
if (dev->cid_elem)
snd_mixer_selem_set_playback_switch_all(dev->cid_elem, 0);
if (dev->speaker_elem)
snd_mixer_selem_set_playback_switch_all(dev->speaker_elem, 0);
snd_mixer_close(dev->mhandle);
}
return 0;
}
static int alsa_xrun_recovery(struct device_struct *dev)
{
int err;
int len;
DBG("alsa xrun: try to recover...\n");
err = snd_pcm_prepare(dev->phandle);
if (err < 0) {
ERR("xrun recovery: cannot prepare playback: %s\n", snd_strerror(err));
return err;
}
len = dev->delay - INTERNAL_DELAY;
snd_pcm_format_set_silence(SND_PCM_FORMAT_S16_LE, outbuf, len);
err = snd_pcm_writei(dev->phandle, outbuf, len);
if (err < 0) {
ERR("xrun recovery: write error: %s\n", snd_strerror(err));
return err;
}
err = snd_pcm_start(dev->chandle);
if(err < 0) {
ERR("xrun recovcery snd_pcm_start error: %s\n", snd_strerror(err));
return err;
}
DBG("alsa xrun: recovered.\n");
return 0;
}
static int alsa_device_read(struct device_struct *dev, char *buf, int count)
{
int ret;
do {
ret = snd_pcm_readi(dev->chandle,buf,count);
if (ret == -EPIPE) {
ret = alsa_xrun_recovery(dev);
break;
}
} while (ret == -EAGAIN);
#if 0
if(ret != dev->period)
DBG("alsa_device_read (%d): %d ...\n",count,ret);
#endif
return ret ;
}
static int alsa_device_write(struct device_struct *dev, const char *buf, int count)
{
int written = 0;
if(!dev->started)
return 0;
while(count > 0) {
int ret = snd_pcm_writei(dev->phandle,buf,count);
if(ret < 0) {
if (ret == -EAGAIN)
continue;
if (ret == -EPIPE) {
ret = alsa_xrun_recovery(dev);
}
written = ret;
break;
}
count -= ret;
buf += ret;
written += ret;
}
#if 0
if(written != dev->period)
DBG("alsa_device_write (%d): %d...\n",asked,written);
#endif
return written;
}
static snd_pcm_format_t mdm2snd_format(unsigned mdm_format)
{
if(mdm_format == MFMT_S16_LE)
return SND_PCM_FORMAT_S16_LE;
return SND_PCM_FORMAT_UNKNOWN;
}
static int setup_stream(snd_pcm_t *handle, struct modem *m, const char *stream_name)
{
struct device_struct *dev = m->dev_data;
snd_pcm_hw_params_t *hw_params;
snd_pcm_sw_params_t *sw_params;
snd_pcm_format_t format;
unsigned int rate, rrate;
snd_pcm_uframes_t size, rsize;
int err;
err = snd_pcm_hw_params_malloc(&hw_params);
if (err < 0) {
ERR("cannot alloc hw params for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_hw_params_any(handle,hw_params);
if (err < 0) {
ERR("cannot init hw params for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_hw_params_set_access(handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0) {
ERR("cannot set access for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
format = mdm2snd_format(m->format);
if(format == SND_PCM_FORMAT_UNKNOWN) {
ERR("unsupported format for %s\n",stream_name);
return -1;
}
err = snd_pcm_hw_params_set_format(handle, hw_params, format);
if (err < 0) {
ERR("cannot set format for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_hw_params_set_channels(handle, hw_params, 1);
if (err < 0) {
ERR("cannot set channels for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
rrate = rate = m->srate;
err = snd_pcm_hw_params_set_rate_near(handle, hw_params, &rrate, 0);
if (err < 0) {
ERR("cannot set rate for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
if ( rrate != rate ) {
ERR("rate %d is not supported by %s (%d).\n",
rate, stream_name, rrate);
return -1;
}
rsize = size = dev->period ;
err = snd_pcm_hw_params_set_period_size_near(handle, hw_params, &rsize, NULL);
if (err < 0) {
ERR("cannot set periods for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
if ( rsize < size ) {
ERR("period size %ld is not supported by %s (%ld).\n",
size, stream_name, rsize);
return -1;
}
rsize = size = use_short_buffer ? rsize * dev->buf_periods : rsize * 32;
err = snd_pcm_hw_params_set_buffer_size_near(handle, hw_params, &rsize);
if (err < 0) {
ERR("cannot set buffer for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
if ( rsize != size ) {
DBG("buffer size for %s is changed %ld -> %ld\n",
stream_name, size, rsize);
}
err = snd_pcm_hw_params(handle, hw_params);
if (err < 0) {
ERR("cannot setup hw params for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_prepare(handle);
if (err < 0) {
ERR("cannot prepare %s: %s\n", stream_name, snd_strerror(err));
return err;
}
snd_pcm_hw_params_free(hw_params);
err = snd_pcm_sw_params_malloc(&sw_params);
if (err < 0) {
ERR("cannot alloc sw params for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_sw_params_current(handle,sw_params);
if (err < 0) {
ERR("cannot get sw params for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_sw_params_set_start_threshold(handle, sw_params, INT_MAX);
if (err < 0) {
ERR("cannot set start threshold for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_sw_params_set_avail_min(handle, sw_params, 4);
if (err < 0) {
ERR("cannot set avail min for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_sw_params_set_xfer_align(handle, sw_params, 4);
if (err < 0) {
ERR("cannot set align for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
err = snd_pcm_sw_params(handle, sw_params);
if (err < 0) {
ERR("cannot set sw params for %s: %s\n", stream_name, snd_strerror(err));
return err;
}
snd_pcm_sw_params_free(sw_params);
if(modem_debug_level > 0)
snd_pcm_dump(handle,dbg_out);
return 0;
}
static int alsa_start (struct modem *m)
{
struct device_struct *dev = m->dev_data;
int err, len;
DBG("alsa_start...\n");
dev->period = m->frag;
dev->buf_periods = use_short_buffer ? SHORT_BUFFER_PERIODS : BUFFER_PERIODS;
err = setup_stream(dev->phandle, m, "playback");
if(err < 0)
return err;
err = setup_stream(dev->chandle, m, "capture");
if(err < 0)
return err;
dev->delay = 0;
len = use_short_buffer ? dev->period * dev->buf_periods : 384;
DBG("startup write: %d...\n",len);
err = snd_pcm_format_set_silence(SND_PCM_FORMAT_S16_LE, outbuf, len);
if(err < 0) {
ERR("silence error\n");
return err;
}
err = snd_pcm_writei(dev->phandle,outbuf,len);
if(err < 0) {
ERR("startup write error\n");
return err;
}
dev->delay = err;
dev->delay += INTERNAL_DELAY; /* <-- fixme: delay detection is needed */
err = snd_pcm_link(dev->chandle, dev->phandle);
if(err < 0) {
ERR("snd_pcm_link error: %s\n", snd_strerror(err));
return err;
}
err = snd_pcm_start(dev->chandle);
if(err < 0) {
ERR("snd_pcm_start error: %s\n", snd_strerror(err));
return err;
}
dev->started = 1;
return 0;
}
static int alsa_stop (struct modem *m)
{
struct device_struct *dev = m->dev_data;
DBG("alsa_stop...\n");
dev->started = 0;
snd_pcm_drop(dev->chandle);
snd_pcm_nonblock(dev->phandle, 0);
snd_pcm_drain(dev->phandle);
snd_pcm_nonblock(dev->phandle, 1);
snd_pcm_unlink(dev->chandle);
snd_pcm_hw_free(dev->phandle);
snd_pcm_hw_free(dev->chandle);
return 0;
}
static int alsa_ioctl(struct modem *m, unsigned int cmd, unsigned long arg)
{
/* TODO */
struct device_struct *dev = m->dev_data;
DBG("alsa_ioctl: cmd %x, arg %lx...\n",cmd,arg);
switch(cmd) {
case MDMCTL_CAPABILITIES:
return -EINVAL;
case MDMCTL_HOOKSTATE:
return (dev->hook_off_elem) ?
snd_mixer_selem_set_playback_switch_all(
dev->hook_off_elem,
(arg == MODEM_HOOK_OFF) ) : 0 ;
case MDMCTL_SPEAKERVOL:
return (dev->speaker_elem) ?
snd_mixer_selem_set_playback_volume_all(
dev->speaker_elem, arg) : 0 ;
case MDMCTL_CODECTYPE:
return CODEC_SILABS;
case MDMCTL_IODELAY:
DBG("delay = %d\n", dev->delay);
return dev->delay;
default:
return 0;
}
return -EINVAL;
}
struct modem_driver alsa_modem_driver = {
.name = "alsa modem driver",
.start = alsa_start,
.stop = alsa_stop,
.ioctl = alsa_ioctl,
};
#endif
/*
* 'driver' stuff
*
*/
static int modemap_start (struct modem *m)
{
struct device_struct *dev = m->dev_data;
int ret;
DBG("modemap_start...\n");
dev->delay = 0;
ret = ioctl(dev->fd,100000+MDMCTL_START,0);
if (ret < 0)
return ret;
ret = 192*2;
memset(outbuf, 0 , ret);
ret = write(dev->fd, outbuf, ret);
if (ret < 0) {
ioctl(dev->fd,100000+MDMCTL_STOP,0);
return ret;
}
dev->delay = ret/2;
return 0;
}
static int modemap_stop (struct modem *m)
{
struct device_struct *dev = m->dev_data;
DBG("modemap_stop...\n");
return ioctl(dev->fd,100000+MDMCTL_STOP,0);
}
static int modemap_ioctl(struct modem *m, unsigned int cmd, unsigned long arg)
{
struct device_struct *dev = m->dev_data;
int ret;
DBG("modemap_ioctl: cmd %x, arg %lx...\n",cmd,arg);
if (cmd == MDMCTL_SETFRAG)
arg <<= MFMT_SHIFT(m->format);
ret = ioctl(dev->fd,cmd+100000,&arg);
if (cmd == MDMCTL_IODELAY && ret > 0) {
ret >>= MFMT_SHIFT(m->format);
ret += dev->delay;
}
return ret;
}
struct modem_driver mdm_modem_driver = {
.name = "modemap driver",
.start = modemap_start,
.stop = modemap_stop,
.ioctl = modemap_ioctl,
};
static int socket_start (struct modem *m)
{
struct device_struct *dev = m->dev_data;
int ret;
DBG("socket_start...\n");
int sockets[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) == -1) {
perror("socketpair");
exit(-1);
}
pid_t ppid = getpid();
pid_t pid = fork();
if (pid == -1) {
perror("fork");
exit(-1);
}
if (pid == 0) { // child
char _str[12];
char _parent[12];
snprintf(_str,sizeof(_str),"%d",sockets[0]);
snprintf(_parent,sizeof(_parent),"%d",ppid);
const char *_modem_path = strrchr(modem_dev_name, '/');
_modem_path = _modem_path == NULL ? modem_dev_name : _modem_path + 1;
close(sockets[1]);
if(_MODEM_DO_ANSWER) {
DBG("MODEM_ANSW execl arg: %s, %s, %s, %s, %s\n",modem_exec,"rr",_str,_parent,_modem_path);
ret = execl(modem_exec,modem_exec,"rr",_str,_parent,_modem_path,NULL);
}
else {
DBG("MODEM_DIAL execl arg: %s, %s, %s, %s, %s\n",modem_exec,m->dial_string,_str,_parent,_modem_path);
ret = execl(modem_exec,modem_exec,m->dial_string,_str,_parent,_modem_path,NULL);
}
if (ret == -1) {
ERR("prog: %s\n", modem_exec);
perror("execl");
exit(-1);
}
} else {
close(sockets[0]);
dev->fd = sockets[1];
dev->delay = 0;
ret = 192*2;
memset(outbuf, 0 , ret);
ret = write(dev->fd, outbuf, ret);
if (ret < 0) {
close(dev->fd);
dev->fd = -1;
return ret;
}
dev->delay = ret/2;
DBG("done delay thing %d\n", dev->delay);
}
return 0;
}
static int socket_stop (struct modem *m)
{
struct device_struct *dev = m->dev_data;
DBG("socket_stop...\n");
close(dev->fd);
dev->fd = -1;
wait(NULL); // for exec'ed child
return 0;
}
static int socket_ioctl(struct modem *m, unsigned int cmd, unsigned long arg)
{
//struct device_struct *dev = m->dev_data;
int ret = 0;
DBG("socket_ioctl: cmd %x, arg %lx...\n",cmd,arg);
if (cmd == MDMCTL_SETFRAG)
arg <<= MFMT_SHIFT(m->format);
switch (cmd) {
case MDMCTL_CAPABILITIES:
ret = -EINVAL;
break;
case MDMCTL_CODECTYPE:
ret = 4; // CODEC_STLC7550; XXX this worked fine as 0 (CODEC_UNKNOWN)...
break;
case MDMCTL_IODELAY: // kernel module returns s->delay + ST7554_HW_IODELAY (48)
ret = 0;//48 >> MFMT_SHIFT(m->format);
//ret += dev->delay;
//DBG("%d %d %d %d",m->format,MFMT_SHIFT(m->format),dev->delay,ret);
break;
case MDMCTL_HOOKSTATE: // 0 = on, 1 = off
case MDMCTL_SPEED: // sample rate (9600)
case MDMCTL_GETFMTS:
case MDMCTL_SETFMT:
case MDMCTL_SETFRAGMENT: // (30)
case MDMCTL_START:
case MDMCTL_STOP:
case MDMCTL_GETSTAT:
ret = 0;
break;
default:
return -ENOIOCTLCMD;
}
DBG("socket_ioctl: returning %x\n",ret);
return ret;
}
struct modem_driver socket_modem_driver = {
.name = "socket driver",
.start = socket_start,
.stop = socket_stop,
.ioctl = socket_ioctl,
};
static int mdm_device_read(struct device_struct *dev, char *buf, int size)
{
int ret = read(dev->fd, buf, size*2);
if (ret > 0) ret /= 2;
return ret;
}
static int mdm_device_write(struct device_struct *dev, const char *buf, int size)
{
int ret = write(dev->fd, buf, size*2);
if (ret > 0) ret /= 2;
return ret;
}
#if 0
static int mdm_device_setup(struct device_struct *dev, const char *dev_name)
{
struct stat stbuf;
int ret, fd;
memset(dev,0,sizeof(*dev));
ret = stat(dev_name,&stbuf);
if(ret) {
ERR("mdm setup: cannot stat `%s': %s\n", dev_name, strerror(errno));
return -1;
}
if(!S_ISCHR(stbuf.st_mode)) {
ERR("mdm setup: not char device `%s'\n", dev_name);
return -1;
}
/* device stuff */
fd = open(dev_name,O_RDWR);
if(fd < 0) {
ERR("mdm setup: cannot open dev `%s': %s\n",dev_name,strerror(errno));
return -1;
}
dev->fd = fd;
dev->num = minor(stbuf.st_rdev);
return 0;
}
#endif
static int mdm_device_release(struct device_struct *dev)
{
close(dev->fd);
return 0;
}
static int socket_device_setup(struct device_struct *dev, const char *dev_name)
{
memset(dev,0,sizeof(*dev));
return 0;
}
/*
* PTY creation (or re-creation)
*
*/
static char link_name[PATH_MAX];
int create_pty(struct modem *m)
{
struct termios termios;
const char *pty_name;
int pty, ret;
if(m->pty)
close(m->pty);
pty = getpt();
if (pty < 0 || grantpt(pty) < 0 || unlockpt(pty) < 0) {
ERR("getpt: %s\n", strerror(errno));
return -1;
}
if(m->pty) {
termios = m->termios;
}
else {
ret = tcgetattr(pty, &termios);
/* non canonical raw tty */
cfmakeraw(&termios);
cfsetispeed(&termios, B115200);
cfsetospeed(&termios, B115200);
}
ret = tcsetattr(pty, TCSANOW, &termios);
if (ret) {
ERR("tcsetattr: %s\n",strerror(errno));
return -1;
}
fcntl(pty,F_SETFL,O_NONBLOCK);
pty_name = ptsname(pty);
m->pty = pty;
m->pty_name = pty_name;
modem_update_termios(m,&termios);
modem_group = NULL;
if(modem_group && *modem_group) {
struct group *grp = getgrnam(modem_group);
if(!grp) {
ERR("cannot find group '%s': %s\n", modem_group,
strerror(errno));
}
else {
ret = chown(pty_name, -1, grp->gr_gid);
if(ret < 0) {
ERR("cannot chown '%s' to ':%s': %s\n",
pty_name, modem_group, strerror(errno));
}
}
}
ret = chmod(pty_name, modem_perm);
if (ret < 0) {
ERR("cannot chmod '%s' to %o: %s\n",
pty_name, modem_perm, strerror(errno));
}
if(*link_name) {
unlink(link_name);
if(symlink(pty_name,link_name)) {
ERR("cannot create symbolink link `%s' -> `%s': %s\n",
link_name,pty_name,strerror(errno));
*link_name = '\0';
}
else {
INFO("symbolic link `%s' -> `%s' created.\n",
link_name, pty_name);
}
}
return 0;
}
/*
* main run cycle
*
*/
static int (*device_setup)(struct device_struct *dev, const char *dev_name);
static int (*device_release)(struct device_struct *dev);
static int (*device_read)(struct device_struct *dev, char *buf, int size);
static int (*device_write)(struct device_struct *dev, const char *buf, int size);
static struct modem_driver *modem_driver;
static volatile sig_atomic_t keep_running = 1;
void mark_termination(int signum)
{
DBG("signal %d: mark termination.\n",signum);
keep_running = 0;
}
static int modem_run(struct modem *m, struct device_struct *dev)
{
struct timeval tmo;
fd_set rset,eset;
struct termios termios;
unsigned pty_closed = 0, close_count = 0;
int max_fd;
int ret, count;
void *in;
while(keep_running) {
if(m->event)
modem_event(m);
#ifdef MODEM_CONFIG_RING_DETECTOR
if(ring_detector && !m->started)
modem_ring_detector_start(m);
#endif
tmo.tv_sec = 1;
tmo.tv_usec= 0;
FD_ZERO(&rset);
FD_ZERO(&eset);
if(m->started)
FD_SET(dev->fd,&rset);
FD_SET(dev->fd,&eset);
max_fd = dev->fd;
if(pty_closed && close_count > 0) {
if(!m->started ||
++close_count > CLOSE_COUNT_MAX )
close_count = 0;
}
else if(m->xmit.size - m->xmit.count > 0) {
FD_SET(m->pty,&rset);
if(m->pty > max_fd) max_fd = m->pty;
}
ret = select(max_fd + 1,&rset,NULL,&eset,&tmo);
if (ret < 0) {
if (errno == EINTR)
continue;
ERR("select: %s\n",strerror(errno));
return ret;
}
if ( ret == 0 )
continue;
if(FD_ISSET(dev->fd, &eset)) {
unsigned stat;
DBG("dev exception...\n");
#ifdef SUPPORT_ALSA
if(use_alsa) {
DBG("dev exception...\n");
continue;
}
#endif
ret = ioctl(dev->fd,100000+MDMCTL_GETSTAT,&stat);
if(ret < 0) {
ERR("dev ioctl: %s\n",strerror(errno));
return -1;
}
if(stat&MDMSTAT_ERROR) modem_error(m);
if(stat&MDMSTAT_RING) modem_ring(m);
continue;
}
if(FD_ISSET(dev->fd, &rset)) {
count = device_read(dev,inbuf,sizeof(inbuf)/2);
if(count <= 0) {
if (errno == ECONNRESET) {
DBG("lost connection to child socket process\n");
} else {
ERR("dev read: %s\n",strerror(errno));
}
// hack to force hangup
modem_hangup(m); // sets sample_timer_func to run_modem_stop()
m->sample_timer_func(m);
m->sample_timer = 0;
m->sample_timer_func = NULL;
continue;
}
in = inbuf;
if(m->update_delay < 0) {
if ( -m->update_delay >= count) {
DBG("change delay -%d...\n", count);
dev->delay -= count;
m->update_delay += count;
continue;
}
DBG("change delay %d...\n", m->update_delay);
in -= m->update_delay;
count += m->update_delay;
dev->delay += m->update_delay;
m->update_delay = 0;
}
modem_process(m,inbuf,outbuf,count);
if (dev->fd == -1) {
DBG("closed connection to child socket process\n");
continue;
}
count = device_write(dev,outbuf,count);
if(count < 0) {
ERR("dev write: %s\n",strerror(errno));
return -1;
}
else if (count == 0) {
DBG("dev write = 0\n");
}
if(m->update_delay > 0) {
DBG("change delay +%d...\n", m->update_delay);
memset(outbuf, 0, m->update_delay*2);
count = device_write(dev,outbuf,m->update_delay);
if(count < 0) {
ERR("dev write: %s\n",strerror(errno));
return -1;
}
if(count != m->update_delay) {
ERR("cannot update delay: %d instead of %d.\n",
count, m->update_delay);
return -1;
}
dev->delay += m->update_delay;
m->update_delay = 0;
}
}
if(FD_ISSET(m->pty,&rset)) {
/* check termios */
tcgetattr(m->pty,&termios);
if(memcmp(&termios,&m->termios,sizeof(termios))) {
DBG("termios changed.\n");
modem_update_termios(m,&termios);
}
/* read data */
count = m->xmit.size - m->xmit.count;
if(count == 0)
continue;
if(count > sizeof(inbuf))
count = sizeof(inbuf);
count = read(m->pty,inbuf,count);
if(count < 0) {
if(errno == EAGAIN) {
DBG("pty read, errno = EAGAIN\n");
continue;
}
if(errno == EIO) { /* closed */
if(!pty_closed) {
DBG("pty closed.\n");
if(termios.c_cflag&HUPCL) {
modem_hangup(m);
/* re-create PTM - simulate hangup */
ret = create_pty(m);
if (ret < 0) {
ERR("cannot re-create PTY.\n");
return -1;
}
}
else
pty_closed = 1;
}
// DBG("pty read, errno = EIO\n");
close_count = 1;
continue;
}
else
ERR("pty read: %s\n",strerror(errno));
return -1;
}
else if (count == 0) {
DBG("pty read = 0\n");
}
pty_closed = 0;
count = modem_write(m,inbuf,count);
if(count < 0) {
ERR("modem_write failed.\n");
return -1;
}
}
}
return 0;
}
int modem_main(const char *dev_name)
{
char path_name[PATH_MAX];
struct device_struct device;
struct modem *m;
int pty;
int ret = 0;
// struct passwd *pwd;
modem_debug_init(basename(dev_name));
ret = device_setup(&device, dev_name);
if (ret) {
ERR("cannot setup device `%s'\n", dev_name);
exit(-1);
}
dp_dummy_init();
dp_sinus_init();
prop_dp_init();
modem_timer_init();
sprintf(link_name, "%s", modem_dev_name);
m = modem_create(modem_driver,basename(dev_name));
m->name = basename(dev_name);
m->dev_data = &device;
m->dev_name = dev_name;
ret = create_pty(m);
if(ret < 0) {
ERR("cannot create PTY.\n");
exit(-1);
}
INFO("modem `%s' created. TTY is `%s'\n",
m->name, m->pty_name);
// sprintf(path_name,"/var/lib/slmodem/data.%s",basename(dev_name));
// datafile_load_info(path_name,&m->dsp_info);
if (need_realtime) {
struct sched_param prm;
if(mlockall(MCL_CURRENT|MCL_FUTURE)) {
ERR("mlockall: %s\n",strerror(errno));
}
prm.sched_priority = sched_get_priority_max(SCHED_FIFO);
if(sched_setscheduler(0,SCHED_FIFO,&prm)) {
ERR("sched_setscheduler: %s\n",strerror(errno));
}
DBG("rt applyed: SCHED_FIFO, pri %d\n",prm.sched_priority);
}
signal(SIGINT, mark_termination);
signal(SIGTERM, mark_termination);
#ifdef SLMODEMD_USER
if (need_realtime) {
struct rlimit limit;
if (getrlimit(RLIMIT_MEMLOCK, &limit)) {
ERR("getrlimit failed to read RLIMIT_MEMLOCK\n");
exit(-1);
}
if (limit.rlim_cur != RLIM_INFINITY &&
limit.rlim_cur < LOCKED_MEM_MIN) {
ERR("locked memory limit too low:\n");
ERR("need %lu bytes, have %lu bytes\n", LOCKED_MEM_MIN,
(unsigned long)limit.rlim_cur);
ERR("try 'ulimit -l %lu'\n", LOCKED_MEM_MIN_KB);
exit(-1);
}
}
pwd = getpwnam(SLMODEMD_USER);
if (!pwd) {
ERR("getpwnam " SLMODEMD_USER ": %s\n",strerror(errno));
exit(-1);
}
ret = (setgroups(1,&pwd->pw_gid) ||
setgid(pwd->pw_gid) ||
setuid(pwd->pw_uid));
if (ret) {
ERR("setgroups or setgid %ld or setuid %ld failed: %s\n",
(long)pwd->pw_gid,(long)pwd->pw_uid,strerror(errno));
exit(-1);
}
if (setuid(0) != -1) {
ERR("setuid 0 succeeded after dropping privileges!\n");
exit(-1);
}
DBG("dropped privileges to %ld.%ld\n",
(long)pwd->pw_gid,(long)pwd->pw_uid);
#endif
INFO("Use `%s' as modem device, Ctrl+C for termination.\n",
*link_name ? link_name : m->pty_name);
/* main loop here */
ret = modem_run(m,&device);
datafile_save_info(path_name,&m->dsp_info);
pty = m->pty;
modem_delete(m);
usleep(100000);
close(pty);
if(*link_name)
unlink(link_name);
dp_dummy_exit();
dp_sinus_exit();
prop_dp_exit();
device_release(&device);
modem_debug_exit();
exit(ret);
return 0;
}
int main(int argc, char *argv[])
{
extern void modem_cmdline(int argc, char *argv[]);
int ret;
modem_cmdline(argc,argv);
if(!modem_dev_name) modem_dev_name = "/tmp/ttySL0";
device_setup = socket_device_setup;
device_release = mdm_device_release;
device_read = mdm_device_read;
device_write = mdm_device_write;
modem_driver = &socket_modem_driver;
#ifdef SUPPORT_ALSA
if(use_alsa) {
device_setup = alsa_device_setup;
device_release = alsa_device_release;
device_read = alsa_device_read;
device_write = alsa_device_write;
modem_driver = &alsa_modem_driver;
}
#endif
ret = modem_main(modem_dev_name);
return ret;
}
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