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sdm120c.c
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sdm120c.c
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#ifdef __cplusplus
extern "C" {
#endif
/*
* sdm120c: ModBus RTU client to read EASTRON SDM120C smart mini power meter registers
*
* Copyright (C) 2015 Gianfranco Di Prinzio <gianfrdp@inwind.it>
*
* Locking code partially from aurora by Curtronis.
* Some code by TheDrake too. :)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// Enable checks for inter-lock problems debug
#define CHECKFORGHOSTAPPEND 0
#define CHECKFORCLEARLOCKRACE 0
#include <sys/types.h>
#include <sys/file.h>
#include <sys/time.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <getopt.h>
#include <syslog.h>
#if CHECKFORCLEARLOCKRACE
#include <glob.h>
#endif
#include <modbus-version.h>
#include <modbus.h>
#define DEFAULT_RATE 2400
#define MODEL_120 1
#define MODEL_220 2
// Read
#define VOLTAGE 0x0000
#define CURRENT 0x0006
#define POWER 0x000C
#define APOWER 0x0012
#define RAPOWER 0x0018
#define PFACTOR 0x001E
#define PANGLE 0x0024
#define FREQUENCY 0x0046
#define IAENERGY 0x0048
#define EAENERGY 0x004A
#define IRAENERGY 0x004C
#define ERAENERGY 0x004E
#define TAENERGY 0x0156
#define TRENERGY 0x0158
// Write
#define NPARSTOP 0x0012
#define DEVICE_ID 0x0014
#define BAUD_RATE 0x001C
#define TIME_DISP_220 0xF500
#define TIME_DISP 0xF900
#define PULSE_OUT 0xF910
#define TOT_MODE 0xF920
#define BR1200 5
#define BR2400 0
#define BR4800 1
#define BR9600 2
#define MAX_RETRIES 100
#define E_PARITY 'E'
#define O_PARITY 'O'
#define N_PARITY 'N'
#define RESTART_TRUE 1
#define RESTART_FALSE 0
#define DEBUG_STDERR 1
#define DEBUG_SYSLOG 2
int debug_mask = 0; //DEBUG_STDERR | DEBUG_SYSLOG; // Default, let pass all
int debug_flag = 0;
int trace_flag = 0;
int metern_flag = 0;
const char *version = "1.3.5.6";
char *programName;
const char *ttyLCKloc = "/var/lock/LCK.."; /* location and prefix of serial port lock file */
#define CMDLINESIZE 128 /* should be enough for debug */
char cmdline[CMDLINESIZE]="";
long unsigned int PID;
long unsigned int PPID;
char *PARENTCOMMAND = NULL;
static int yLockWait = 0; /* Seconds to wait to lock serial port */
static time_t command_delay = -1; // = 30; /* MilliSeconds to wait before sending a command */
static time_t settle_time = -1; // us to wait line to settle before starting chat
char *devLCKfile = NULL;
char *devLCKfileNew = NULL;
void usage(char* program) {
printf("sdm120c %s: ModBus RTU client to read EASTRON SDM120C smart mini power meter registers\n",version);
printf("Copyright (C) 2015 Gianfranco Di Prinzio <gianfrdp@inwind.it>\n");
printf("Complied with libmodbus %s\n\n", LIBMODBUS_VERSION_STRING);
printf("Usage: %s [-a address] [-d n] [-x] [-p] [-v] [-c] [-e] [-i] [-t] [-f] [-g] [-T] [[-m]|[-q]] [-b baud_rate] [-P parity] [-S bit] [-z num_retries] [-j seconds] [-w seconds] [-1 | -2] device\n", program);
printf(" %s [-a address] [-d n] [-x] [-b baud_rate] [-P parity] [-S bit] [-1 | -2] [-z num_retries] [-j seconds] [-w seconds] -s new_address device\n", program);
printf(" %s [-a address] [-d n] [-x] [-b baud_rate] [-P parity] [-S bit] [-1 | -2] [-z num_retries] [-j seconds] [-w seconds] -r baud_rate device \n", program);
printf(" %s [-a address] [-d n] [-x] [-b baud_rate] [-P parity] [-S bit] [-1 | -2] [-z num_retries] [-j seconds] [-w seconds] -N parity device \n", program);
printf(" %s [-a address] [-d n] [-x] [-b baud_rate] [-P parity] [-S bit] [-1 | -2] [-z num_retries] [-j seconds] [-w seconds] -R new_time device \n", program);
printf(" %s [-a address] [-d n] [-x] [-b baud_rate] [-P parity] [-S bit] [-1 | -2] [-z num_retries] [-j seconds] [-w seconds] -M new_mmode device \n", program);
printf(" %s [-a address] [-d n] [-x] [-b baud_rate] [-P parity] [-S bit] [-1 | -2] [-z num_retries] [-j seconds] [-w seconds] -O new_pulse device\n\n", program);
printf("Required:\n");
printf("\tdevice\t\tSerial device (i.e. /dev/ttyUSB0)\n");
printf("Connection parameters:\n");
printf("\t-a address \tMeter number (1-247). Default: 1\n");
printf("\t-b baud_rate \tUse baud_rate serial port speed (1200, 2400, 4800, 9600)\n");
printf("\t\t\tDefault: 2400\n");
printf("\t-P parity \tUse parity (E, N, O)\n");
printf("\t-S bit \t\tUse stop bits (1, 2). Default: 1\n");
printf("\t-1 \t\tModel: SDM120C (default)\n");
printf("\t-2 \t\tModel: SDM220\n");
printf("Reading parameters (no parameter = retrieves all values):\n");
printf("\t-p \t\tGet power (W)\n");
printf("\t-v \t\tGet voltage (V)\n");
printf("\t-c \t\tGet current (A)\n");
printf("\t-l \t\tGet apparent power (VA)\n");
printf("\t-n \t\tGet reactive power (VAR)\n");
printf("\t-f \t\tGet frequency (Hz)\n");
printf("\t-o \t\tGet phase angle (Degree)\n");
printf("\t-g \t\tGet power factor\n");
printf("\t-i \t\tGet imported energy (Wh)\n");
printf("\t-e \t\tGet exported energy (Wh)\n");
printf("\t-t \t\tGet total energy (Wh)\n");
printf("\t-A \t\tGet imported reactive energy (VARh)\n");
printf("\t-B \t\tGet exported reactive energy (VARh)\n");
printf("\t-C \t\tGet total reactive energy (VARh)\n");
printf("\t-T \t\tGet Time for rotating display values (0=no rotation)\n");
printf("\t-m \t\tOutput values in IEC 62056 format ID(VALUE*UNIT)\n");
printf("\t-q \t\tOutput values in compact mode\n");
printf("Writing new settings parameters:\n");
printf("\t-s new_address \tSet new meter number (1-247)\n");
printf("\t-r baud_rate \tSet baud_rate meter speed (1200, 2400, 4800, 9600)\n");
printf("\t-N parity \tSet parity and stop bits (0-3)\n");
printf("\t\t\t0: N1, 1: E1, 2: O1, 3: N2\n");
printf("\t-R new_time \tSet rotation time for displaying values (0=no rotation)\n");
printf("\t\t\tSDM120: (0-30s)\n");
printf("\t\t\tSDM220: (m-m-s-m) Demand interval, Slide time, Scroll time, Backlight time\n");
printf("\t-M new_mmode \tSet total energy measurement mode (1-3)\n");
printf("\t\t\t1: Total=Import, 2: Total=Import+Export, 3: Total=Import-Export\n");
printf("\t-O new_pulse \tSet Pulse 1 output (0-3)\n");
printf("\t\t\t0: 0.001kWh/imp(default), 1: 0.01kWh/imp, 2: 0.1kWh/imp, 3: 1kWh/imp\n");
printf("Fine tuning & debug parameters:\n");
printf("\t-z num_retries\tTry to read max num_retries times on bus before exiting\n");
printf("\t\t\twith error. Default: 1 (no retry)\n");
printf("\t-j 1/10 secs\tResponse timeout. Default: 2=0.2s\n");
printf("\t-D 1/1000 secs\tDelay before sending commands. Default: 0ms\n");
printf("\t-w seconds\tTime to wait to lock serial port (1-30s). Default: 0s\n");
printf("\t-W 1/1000 secs\tTime to wait for 485 line to settle. Default: 0ms\n");
printf("\t-y 1/1000 secs\tSet timeout between every bytes (1-500). Default: disabled\n");
printf("\t-d debug_level\tDebug (0=disable, 1=debug, 2=errors to syslog, 3=both)\n");
printf("\t\t\tDefault: 0\n");
printf("\t-x \t\tTrace (libmodbus debug on)\n");
}
/*--------------------------------------------------------------------------
tv_diff
----------------------------------------------------------------------------*/
static long inline tv_diff(struct timeval const * const t1, struct timeval const * const t2)
{
struct timeval res;
timersub(t1, t2, &res);
return res.tv_sec*1000000 + res.tv_usec;
}
/*--------------------------------------------------------------------------
rnd_usleep
----------------------------------------------------------------------------*/
static long inline rnd_usleep(const useconds_t usecs)
{
long unsigned rnd10 = 10.0*rand()/(RAND_MAX+1.0) + 1;
if (usleep(usecs*rnd10) == 0)
return usecs*rnd10;
else
return -1;
}
/*--------------------------------------------------------------------------
getCurTime
----------------------------------------------------------------------------*/
char* getCurTime()
{
time_t curTimeValue;
struct tm *ltime;
static struct timeval _t;
static struct timezone tz;
static char CurTime[100];
time(&curTimeValue);
ltime = (struct tm *) localtime(&curTimeValue);
gettimeofday(&_t, &tz);
sprintf(CurTime, "%04d%02d%02d-%02d:%02d:%02d.%06d", ltime->tm_year + 1900, ltime->tm_mon + 1, ltime->tm_mday, ltime->tm_hour, ltime->tm_min, ltime->tm_sec, (int)_t.tv_usec);
return CurTime;
}
/*--------------------------------------------------------------------------
getCmdLine
----------------------------------------------------------------------------*/
void getCmdLine()
{
int fd = open("/proc/self/cmdline", O_RDONLY);
int nbytesread = read(fd, cmdline, CMDLINESIZE);
char *p;
if (nbytesread>0) {
for (p=cmdline; p < cmdline+nbytesread; p++) if (*p=='\0') *p=' ';
cmdline[nbytesread-1]='\0';
} else
cmdline[0]='\0';
close(fd);
}
/*--------------------------------------------------------------------------
log_message
----------------------------------------------------------------------------*/
void log_message(const int log, const char* format, ...) {
va_list args;
char buffer[1024];
static int bCmdlineSyslogged = 0;
if (log) {
va_start(args, format);
vsnprintf(buffer, 1024, format, args);
va_end(args);
}
if (log & debug_mask & DEBUG_STDERR) {
fprintf(stderr, "%s: %s(%lu) ", getCurTime(), programName, PID);
fprintf(stderr, "%s", buffer);
fprintf(stderr, "\n");
}
if (log & debug_mask & DEBUG_SYSLOG) {
openlog("sdm120c", LOG_PID|LOG_CONS, LOG_USER);
if (!bCmdlineSyslogged) {
char versionbuffer[strlen(programName)+strlen(version)+3];
snprintf(versionbuffer, strlen(programName)+strlen(version)+3, "%s v%s", programName, version);
syslog(LOG_INFO, "%s", versionbuffer);
char parent[80];
snprintf(parent, sizeof(parent), "parent: %s(%lu)", PARENTCOMMAND, PPID);
syslog(LOG_INFO, "%s", parent);
syslog(LOG_INFO, "%s", cmdline);
bCmdlineSyslogged++;
}
syslog(LOG_INFO, buffer);
closelog();
}
}
/*--------------------------------------------------------------------------
getMemPtr
----------------------------------------------------------------------------*/
void *getMemPtr(size_t mSize)
{
void *ptr;
ptr = calloc(sizeof(char),mSize);
if (!ptr) {
log_message(debug_flag | LOG_SYSLOG, "malloc failed");
exit(2);
}
//cptr = (char *)ptr;
//for (i = 0; i < mSize; i++) cptr[i] = '\0';
return ptr;
}
/*--------------------------------------------------------------------------
ClrSerLock
Clear Serial Port lock.
----------------------------------------------------------------------------*/
int ClrSerLock(long unsigned int LckPID) {
FILE *fdserlck, *fdserlcknew;
long unsigned int PID;
int bWrite, bRead;
int errno_save = 0;
int fLen = 0;
int cmdLen = 0;
int curChar = 0;
char *COMMAND = NULL;
errno = 0;
log_message(debug_flag, "devLCKfile: <%s>", devLCKfile);
log_message(debug_flag, "devLCKfileNew: <%s> ", devLCKfileNew);
log_message(debug_flag, "Clearing Serial Port Lock (%lu)...", LckPID);
fdserlck = fopen(devLCKfile, "r");
if (fdserlck == NULL) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem opening serial device lock file to clear PID %lu: %s for read.",LckPID,devLCKfile);
return(0);
}
log_message(debug_flag, "Acquiring exclusive lock on %s...",devLCKfile);
flock(fileno(fdserlck), LOCK_EX); // Will wait to acquire lock then continue
log_message(debug_flag, "Exclusive lock on %s acquired (%d) %s...",devLCKfile, errno, strerror(errno));
#if CHECKFORCLEARLOCKRACE
// Check for potential conflicts
glob_t globbuf;
int iGlob, fGlob = TRUE;
log_message(debug_flag, "GlobCheck - Check to avoid simultaneous PID clearing");
for (iGlob=5; iGlob>0 && fGlob; iGlob--) {
fGlob = FALSE;
if (glob("/var/lock/LCK..ttyUSB0.*", GLOB_NOSORT, NULL, &globbuf) != GLOB_NOMATCH) {
log_message(debug_flag | DEBUG_SYSLOG, "GlobCheck (%u), some other process is clearing lock too!!! (%s)",iGlob, globbuf.gl_pathv[0]);
fGlob=TRUE;
log_message(debug_flag, "Sleeping %ldus", rnd_usleep(500000));
}
globfree(&globbuf);
}
#endif
fdserlcknew = fopen(devLCKfileNew, "a");
if (fdserlcknew == NULL) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem opening new serial device lock file to clear PID %lu: %s for write.",LckPID,devLCKfileNew);
fclose(fdserlck);
return(0);
}
// Find cmdLen max len in file
curChar = 0;
while (curChar != EOF) {
fLen = 0;
while ((curChar = fgetc(fdserlck)) != EOF && curChar != '\n' && curChar != ' ') fLen++;
if (curChar == ' ') {
fLen = 0;
while ((curChar = fgetc(fdserlck)) != EOF && curChar != '\n') fLen++;
if (fLen > cmdLen) cmdLen = fLen;
}
}
rewind(fdserlck);
log_message(debug_flag, "cmdLen=%i", cmdLen);
COMMAND = getMemPtr(cmdLen+1);
log_message(debug_flag, "cmdLen=%i COMMAND %s", cmdLen, (COMMAND==NULL ? "is null" : "is not null"));
COMMAND[0] = '\0'; PID = 0;
errno = 0;
bRead = fscanf(fdserlck, "%lu%*[ ]%[^\n]\n", &PID, COMMAND);
errno_save = errno;
log_message(debug_flag, "errno=%i, bRead=%i LckPID=%lu PID=%lu COMMAND='%s'", errno_save, bRead, LckPID, PID, COMMAND);
while (bRead != EOF && bRead > 0) {
if (PID != LckPID) {
errno = 0;
if (COMMAND[0] != '\0') {
bWrite = fprintf(fdserlcknew, "%lu %s\n", PID, COMMAND);
errno_save = errno;
} else {
bWrite = fprintf(fdserlcknew, "%lu\n", PID);
errno_save = errno;
}
log_message(debug_flag, "errno=%i, bWrite=%i PID=%lu", errno, bWrite, PID);
if (bWrite < 0 || errno_save != 0) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem clearing serial device lock, can't write lock file: %s. %s",devLCKfile,strerror(errno_save));
log_message(debug_flag | DEBUG_SYSLOG, "(%u) %s",errno_save,strerror(errno_save));
fclose(fdserlcknew);
return(0);
}
}
errno=0; PID=0; COMMAND[0] = '\0';
bRead = fscanf(fdserlck, "%lu%*[ ]%[^\n]\n", &PID, COMMAND);
errno_save = errno;
log_message(debug_flag, "errno=%i, bRead=%i LckPID=%lu PID=%lu COMMAND='%s'", errno_save, bRead, LckPID, PID, COMMAND);
}
fflush(fdserlcknew);
errno = 0;
if (rename(devLCKfileNew,devLCKfile)) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem clearing serial device lock, can't update lock file: %s.",devLCKfile);
log_message(debug_flag | DEBUG_SYSLOG, "(%d) %s", errno, strerror(errno));
}
#if CHECKFORGHOSTAPPEND
log_message(debug_flag, "Clearing Serial Port Lock almost done...");
log_message(debug_flag, "Sleeping %luus", rnd_usleep(10000));
// Check for latest appends (ghost appends)
int iGhost=10;
bRead = fscanf(fdserlck, "%lu%*[ ]%*[^\n]\n", &PID);
while (iGhost > 0) {
if (bRead > 0) {
log_message(debug_flag | DEBUG_SYSLOG, "Found ghost append (%d): %s. %lu",iGhost,devLCKfile,PID);
errno = 0;
bWrite = fprintf(fdserlcknew, "%lu\n", PID);
errno_save = errno;
if (bWrite < 0 || errno_save != 0) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem clearing serial device lock, can't write lock file: %s. %s",devLCKfile,strerror (errno_save));
log_message(debug_flag | DEBUG_SYSLOG, "(%u) %s", errno_save, strerror(errno_save));
fclose(fdserlcknew);
return(0);
}
}
fflush(fdserlcknew);
log_message(debug_flag, "Sleeping %ldus", rnd_usleep(10000));
iGhost--; PID=0;
bRead = fscanf(fdserlck, "%lu%*[ ]%*[^\n]\n", &PID);
}
#endif
fclose(fdserlck);
fclose(fdserlcknew);
free(COMMAND);
log_message(debug_flag, "Clearing Serial Port Lock done");
return -1;
}
/*--------------------------------------------------------------------------
AddSerLock
Queue Serial Port lock intent.
----------------------------------------------------------------------------*/
void AddSerLock(const char *szttyDevice, const char *devLCKfile, const long unsigned int PID, char *COMMAND, const int debug_flag) {
FILE *fdserlck;
int bWrite;
int errno_save = 0;
log_message(debug_flag, "Attempting to get lock on Serial Port %s...",szttyDevice);
do {
fdserlck = fopen((const char *)devLCKfile, "a");
if (fdserlck == NULL) {
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "Problem locking serial device, can't open lock file: %s for write.",devLCKfile);
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "Check owner and execution permission for '%s', they shoud be root '-rws--x--x'.",programName);
exit(2);
}
log_message(debug_flag, "Acquiring shared lock on %s...",devLCKfile);
errno = 0;
if (flock(fileno(fdserlck), LOCK_SH | LOCK_NB) == 0) break; // Lock Acquired
errno_save=errno;
if (errno_save == EWOULDBLOCK) {
log_message(debug_flag, "Would block %s, retry (%d) %s...", devLCKfile, errno_save, strerror(errno_save));
rnd_usleep(25000);
fclose(fdserlck);
} else {
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "Problem locking serial device, can't open lock file: %s for write. (%d) %s", devLCKfile, errno_save, strerror(errno_save));
exit(2);
}
} while (errno_save == EWOULDBLOCK);
log_message(debug_flag, "Shared lock on %s acquired...",devLCKfile);
errno=0;
bWrite = fprintf(fdserlck, "%lu %s\n", PID, COMMAND);
errno_save = errno;
fflush(fdserlck);
fclose(fdserlck); // Will release lock
//fdserlck = NULL;
if (bWrite < 0 || errno_save != 0) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem locking serial device, can't write lock file: %s.", devLCKfile);
log_message(debug_flag | DEBUG_SYSLOG, "(%u) %s", devLCKfile, errno_save, strerror(errno_save));
exit(2);
}
}
void exit_error(modbus_t *ctx)
{
/*
// Wait for line settle
log_message(debug_flag, "Sleeping %dms for line settle...", settle_time);
usleep(1000 * settle_time);
log_message(debug_flag, "Flushed %d bytes", modbus_flush(ctx));
*/
modbus_close(ctx);
modbus_free(ctx);
ClrSerLock(PID);
free(devLCKfile);
free(devLCKfileNew);
if (!metern_flag) {
printf("NOK\n");
log_message(debug_flag | DEBUG_SYSLOG, "NOK");
}
free(PARENTCOMMAND);
exit(EXIT_FAILURE);
}
inline int bcd2int(int val)
{
return((((val & 0xf0) >> 4) * 10) + (val & 0xf));
}
int int2bcd(int val)
{
return(((val / 10) << 4) + (val % 10));
}
int bcd2num(const uint16_t *src, int len)
{
int n = 0;
int m = 1;
int i = 0;
int shift = 0;
int digit = 0;
int j = 0;
for (i = 0; i < len; i++) {
for (j = 0; j < 4; j++) {
digit = ((src[len-1-i]>>shift) & 0x0F) * m;
n += digit;
m *= 10;
shift += 4;
}
}
return n;
}
#if 0
// unused
int getMeasureBCD(modbus_t *ctx, int address, int retries, int nb) {
uint16_t tab_reg[nb * sizeof(uint16_t)];
int rc;
int i;
int j = 0;
int exit_loop = 0;
while (j < retries && exit_loop == 0) {
j++;
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
log_message(debug_flag, "%d/%d. Register Address %d [%04X]", j, retries, 30000+address+1, address);
rc = modbus_read_input_registers(ctx, address, nb, tab_reg); // will wait response_timeout for a reply
if (rc == -1) {
log_message(debug_flag | ( j==retries ? DEBUG_SYSLOG : 0), "%s: ERROR (%d) %s, %d/%d, Address %d [%04X]", errno, modbus_strerror(errno), j, retries, 30000+address+1, address);
/* libmodbus already flushes
log_message(debug_flag, "Flushed %d bytes", modbus_flush(ctx));
*/
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
} else {
exit_loop = 1;
}
}
if (rc == -1) {
exit_error(ctx);
}
if (debug_flag) {
for (i=0; i < rc; i++) {
log_message(debug_flag, "reg[%d/%d]=%d (0x%X)", i, (rc-1), tab_reg[i], tab_reg[i]);
}
}
int value = bcd2num(&tab_reg[0], rc);
return value;
}
#endif
float getMeasureFloat(modbus_t *ctx, int address, int retries, int nb) {
uint16_t tab_reg[nb * sizeof(uint16_t)];
int rc = -1;
int i;
int j = 0;
int exit_loop = 0;
int errno_save=0;
struct timeval tvStart, tvStop;
while (j < retries && exit_loop == 0) {
j++;
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
log_message(debug_flag, "%d/%d. Register Address %d [%04X]", j, retries, 30000+address+1, address);
gettimeofday(&tvStart, NULL);
rc = modbus_read_input_registers(ctx, address, nb, tab_reg);
errno_save = errno;
gettimeofday(&tvStop, NULL);
if (rc == -1) {
if (trace_flag) fprintf(stderr, "%s: ERROR (%d) %s, %d/%d\n", programName, errno_save, modbus_strerror(errno_save), j, retries);
log_message(debug_flag | ( j==retries ? DEBUG_SYSLOG : 0), "ERROR (%d) %s, %d/%d, Address %d [%04X]", errno_save, modbus_strerror(errno_save), j, retries, 30000+address+1, address);
log_message(debug_flag | ( j==retries ? DEBUG_SYSLOG : 0), "Response timeout gave up after %ldus", tv_diff(&tvStop, &tvStart));
/* libmodbus already flushes
log_message(debug_flag, "Flushing modbus buffer");
log_message(debug_flag, "Flushed %d bytes", modbus_flush(ctx));
*/
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
} else {
log_message(debug_flag, "Read time: %ldus", tv_diff(&tvStop, &tvStart));
exit_loop = 1;
}
}
if (rc == -1) {
exit_error(ctx);
}
if (debug_flag) {
for (i=0; i < rc; i++) {
log_message(debug_flag, "reg[%d/%d]=%d (0x%X)", i, (rc-1), tab_reg[i], tab_reg[i]);
}
}
// swap LSB and MSB
uint16_t tmp1 = tab_reg[0];
uint16_t tmp2 = tab_reg[1];
tab_reg[0] = tmp2;
tab_reg[1] = tmp1;
float value = modbus_get_float(&tab_reg[0]);
return value;
}
int getConfigBCD(modbus_t *ctx, int address, int retries, int nb) {
uint16_t tab_reg[nb * sizeof(uint16_t)];
int rc = -1;
int i;
int j = 0;
int exit_loop = 0;
while (j < retries && exit_loop == 0) {
j++;
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
log_message(debug_flag, "%d/%d. Register Address %d [%04X]", j, retries, 400000+address+1, address);
rc = modbus_read_registers(ctx, address, nb, tab_reg);
if (rc == -1) {
log_message(debug_flag | ( j==retries ? DEBUG_SYSLOG : 0), "ERROR (%d) %s, %d/%d, Address %d [%04X]", errno, modbus_strerror(errno), j, retries, 30000+address+1, address);
/* libmodbus already flushes
log_message(debug_flag, "Flushing modbus buffer");
log_message(debug_flag, "Flushed %d bytes", modbus_flush(ctx));
*/
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
} else {
exit_loop = 1;
}
}
if (rc == -1) {
exit_error(ctx);
}
if (debug_flag) {
for (i=0; i < rc; i++) {
log_message(debug_flag, "reg[%d/%d]=%d (0x%X)", i, (rc-1), tab_reg[i], tab_reg[i]);
}
}
int value = bcd2num(&tab_reg[0], rc);
return value;
}
void changeConfigHex(modbus_t *ctx, int address, int new_value, int restart)
{
uint16_t tab_reg[1];
tab_reg[0] = new_value;
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
int n = modbus_write_registers(ctx, address, 1, tab_reg);
if (n != -1) {
printf("New value %d for address 0x%X\n", new_value, address);
if (restart == RESTART_TRUE) printf("You have to restart the meter for apply changes\n");
} else {
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "error 1: (%d) %s, %d, %d", errno, modbus_strerror(errno), n);
if (errno == EMBXILFUN) // Illegal function
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "Tip: is the meter in set mode?");
exit_error(ctx);
}
}
void changeConfigFloat(modbus_t *ctx, int address, int new_value, int restart, int nb)
{
uint16_t tab_reg[nb * sizeof(uint16_t)];
modbus_set_float((float) new_value, &tab_reg[0]);
// swap LSB and MSB
uint16_t tmp1 = tab_reg[0];
uint16_t tmp2 = tab_reg[1];
tab_reg[0] = tmp2;
tab_reg[1] = tmp1;
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
int n = modbus_write_registers(ctx, address, nb, tab_reg);
if (n != -1) {
printf("New value %d for address 0x%X\n", new_value, address);
if (restart == RESTART_TRUE) printf("You have to restart the meter for apply changes\n");
} else {
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "error 2: (%d) %s, %d, %d", errno, modbus_strerror(errno), n);
if (errno == EMBXILFUN) // Illegal function
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "Tip: is the meter in set mode?");
exit_error(ctx);
}
}
void changeConfigBCD(modbus_t *ctx, int address, int new_value, int restart, int nb)
{
uint16_t tab_reg[nb * sizeof(uint16_t)];
uint16_t u_new_value = int2bcd(new_value);
tab_reg[0] = u_new_value;
if (command_delay) {
log_message(debug_flag, "Sleeping command delay: %ldus", command_delay);
usleep(command_delay);
}
int n = modbus_write_registers(ctx, address, nb, tab_reg);
if (n != -1) {
printf("New value %d for address 0x%X\n", u_new_value, address);
if (restart == RESTART_TRUE) printf("You have to restart the meter for apply changes\n");
} else {
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "error 3: (%d) %s, %d, %d", errno, modbus_strerror(errno), n);
if (errno == EMBXILFUN) // Illegal function
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "Tip: is the meter in set mode?");
exit_error(ctx);
}
}
/*--------------------------------------------------------------------------
getIntLen
----------------------------------------------------------------------------*/
int getIntLen(long value){
long l=!value;
while(value) { l++; value/=10; }
return l;
}
/*--------------------------------------------------------------------------
getPIDcmd
----------------------------------------------------------------------------*/
void *getPIDcmd(long unsigned int PID)
{
int fdcmd;
char *COMMAND = NULL;
size_t cmdLen = 0;
size_t length;
char buffer[1024];
char cmdFilename[getIntLen(PID)+14+1];
// Generate the name of the cmdline file for the process
*cmdFilename = '\0';
snprintf(cmdFilename,sizeof(cmdFilename),"/proc/%lu/cmdline",PID);
// Read the contents of the file
if ((fdcmd = open(cmdFilename, O_RDONLY)) < 0) return NULL;
if ((length = read(fdcmd, buffer, sizeof(buffer))) <= 0) {
close(fdcmd); return NULL;
}
close(fdcmd);
// read does not NUL-terminate the buffer, so do it here
buffer[length] = '\0';
// Get 1st string (command)
cmdLen=strlen(buffer)+1;
if((COMMAND = getMemPtr(cmdLen)) != NULL ) {
strncpy(COMMAND, buffer, cmdLen);
COMMAND[cmdLen-1] = '\0';
}
return COMMAND;
}
/*--------------------------------------------------------------------------
lockSer
----------------------------------------------------------------------------*/
void lockSer(const char *szttyDevice, const long unsigned int PID, int debug_flag)
{
char *pos;
FILE *fdserlck = NULL;
char *COMMAND = NULL;
long unsigned int LckPID;
struct timeval tLockStart, tLockNow;
int bRead;
int errno_save = 0;
int fLen = 0;
int curChar = 0;
char *LckCOMMAND = NULL;
char *LckPIDcommand = NULL;
pos = strrchr(szttyDevice, '/');
if (pos > 0) {
pos++;
devLCKfile = getMemPtr(strlen(ttyLCKloc)+(strlen(szttyDevice)-(pos-szttyDevice))+1);
devLCKfile[0] = '\0';
strcpy(devLCKfile,ttyLCKloc);
strcat(devLCKfile, pos);
devLCKfile[strlen(devLCKfile)] = '\0';
devLCKfileNew = getMemPtr(strlen(devLCKfile)+getIntLen(PID)+2); /* dot & terminator */
devLCKfileNew[0] = '\0';
strcpy(devLCKfileNew,devLCKfile);
sprintf(devLCKfileNew,"%s.%lu",devLCKfile,PID);
devLCKfileNew[strlen(devLCKfileNew)] = '\0';
} else {
devLCKfile = NULL;
}
log_message(debug_flag, "szttyDevice: %s",szttyDevice);
log_message(debug_flag, "devLCKfile: <%s>",devLCKfile);
log_message(debug_flag, "devLCKfileNew: <%s>",devLCKfileNew);
log_message(debug_flag, "PID: %lu", PID);
COMMAND = getPIDcmd(PID);
AddSerLock(szttyDevice, devLCKfile, PID, COMMAND, debug_flag);
LckPID = 0;
long unsigned int oldLckPID = 0;
int staleLockRetries = 0;
int const staleLockRetriesMax = 2;
long unsigned int clrStaleTargetPID = 0;
int missingPidRetries = 0;
int const missingPidRetriesMax = 2;
gettimeofday(&tLockStart, NULL);
tLockNow=tLockStart;
if (debug_flag) log_message(debug_flag, "Checking for lock");
while(LckPID != PID && tv_diff(&tLockNow, &tLockStart) <= yLockWait*1000000L) {
do {
fdserlck = fopen(devLCKfile, "r");
if (fdserlck == NULL) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem locking serial device, can't open lock file: %s for read.",devLCKfile);
exit(2);
}
//log_message(debug_flag, "Acquiring shared lock on %s...",devLCKfile);
errno = 0;
if (flock(fileno(fdserlck), LOCK_SH | LOCK_NB) == 0) break; // Lock Acquired
errno_save=errno;
if (errno_save == EWOULDBLOCK) {
log_message(debug_flag, "Would block %s, retry (%d) %s...", devLCKfile, errno_save, strerror(errno_save));
rnd_usleep(25000);
fclose(fdserlck);
} else {
log_message(DEBUG_STDERR | DEBUG_SYSLOG, "Problem locking serial device, can't open lock file: %s for read. (%d) %s", devLCKfile, errno_save, strerror(errno_save));
exit(2);
}
} while (errno_save == EWOULDBLOCK);
//log_message(debug_flag, "Shared lock on %s acquired...",devLCKfile);
fLen = 0;
while ((curChar = fgetc(fdserlck)) != EOF && curChar != '\n' && curChar != ' ') fLen++;
fLen = 0;
if (curChar == ' ') while ((curChar = fgetc(fdserlck)) != EOF && curChar != '\n') fLen++;
rewind(fdserlck);
//if (LckPID != oldLckPID) log_message(debug_flag, "fLen=%i", fLen);
LckCOMMAND = getMemPtr(fLen+1);
//if (LckPID != oldLckPID) log_message(debug_flag, "fLen=%i LckCOMMAND %s", fLen, (LckCOMMAND==NULL ? "is null" : "is not null"));
LckCOMMAND[0] = '\0';
LckPID=0;
errno = 0;
bRead = fscanf(fdserlck, "%lu%*[ ]%[^\n]\n", &LckPID, LckCOMMAND);
errno_save = errno;
fclose(fdserlck);
if (LckPID != oldLckPID) {
log_message(debug_flag | (bRead==EOF || errno_save != 0 ? DEBUG_SYSLOG : 0), "errno=%i, bRead=%i PID=%lu LckPID=%lu", errno_save, bRead, PID, LckPID);
log_message(debug_flag, "Checking process %lu (%s) for lock", LckPID, LckCOMMAND);
//oldLckPID = LckPID;
}
if (bRead == EOF || LckPID == 0 || errno_save != 0) {
log_message(debug_flag | DEBUG_SYSLOG, "Problem locking serial device, can't read PID from lock file: %s.",devLCKfile);
log_message(debug_flag | DEBUG_SYSLOG, "errno=%i, bRead=%i PID=%lu LckPID=%lu", errno_save, bRead, PID, LckPID);
if (errno_save != 0) {
// Real error
log_message(debug_flag | DEBUG_SYSLOG, "(%u) %s", errno_save, strerror(errno_save));
free(LckCOMMAND); free(LckPIDcommand); free(COMMAND);
exit(2);
} else {
if (missingPidRetries < missingPidRetriesMax) {
missingPidRetries++;
log_message(debug_flag, "%s miss process self PID from lock file?",devLCKfile);
} else if (missingPidRetries >= missingPidRetriesMax) {
// Self PID missing... (Should never happen)
log_message(debug_flag | DEBUG_SYSLOG, "%s miss process self PID from lock file, amending.",devLCKfile);
AddSerLock(szttyDevice, devLCKfile, PID, COMMAND, debug_flag);
//LckPID=0;
missingPidRetries = 0;
}
}
oldLckPID = LckPID;
} else { //fread OK
// We got a pid from lockfile, let's clear missing pid status
missingPidRetries = 0;
LckPIDcommand = getPIDcmd(LckPID);
if (LckPID != oldLckPID) {
log_message(debug_flag, "PID: %lu COMMAND: \"%s\" LckPID: %lu LckCOMMAND: \"%s\" LckPIDcommand \"%s\"%s", PID, COMMAND
, LckPID, LckCOMMAND, LckPIDcommand
, LckPID == PID ? " = me" : "");
oldLckPID = LckPID;
}
// PID - this process
// LckPID - PID from lock file
// COMMAND - this process
// LckCOMMAND - process command from lock file
// LckPIDcommand - process command of process using PID from lock file
if ((PID != LckPID && LckPIDcommand == NULL) || (LckCOMMAND[0]!='\0' && strcmp(LckPIDcommand,LckCOMMAND) != 0) || strcmp(LckPIDcommand,"") == 0) {
// Is it a stale lock pid?
if (staleLockRetries < staleLockRetriesMax) {
staleLockRetries++;
clrStaleTargetPID = LckPID;
log_message(debug_flag | (staleLockRetries > 1 ? DEBUG_SYSLOG : 0), "Stale pid lock(%d)? PID=%lu, LckPID=%lu, LckCOMMAND='%s', LckPIDCommand='%s'", staleLockRetries, PID, LckPID, LckCOMMAND, LckPIDcommand);
} else if (LckPID == clrStaleTargetPID && staleLockRetries >= staleLockRetriesMax) {
log_message(debug_flag | DEBUG_SYSLOG, "Clearing stale serial port lock. (%lu)", LckPID);
ClrSerLock(LckPID);
staleLockRetries = 0;
clrStaleTargetPID = 0;
}
} else {
// Pid lock have a process running, let's reset stale pid retries
staleLockRetries = 0;
clrStaleTargetPID = 0;
}
}
if (yLockWait > 0 && LckPID != PID) {
rnd_usleep(25000);
//log_message(debug_flag, "Sleeping %luus", rnd_usleep(25000));
}
// Cleanup and loop
if (LckCOMMAND != NULL) {
free(LckCOMMAND);
LckCOMMAND = NULL;
}
if (LckPIDcommand != NULL) {
free(LckPIDcommand);
LckPIDcommand = NULL;