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term.c
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term.c
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/*
* client.c - simple terminal client
*
* Copyright 2013 Edward V. Emelianoff <eddy@sao.ru>
*
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <unistd.h> // tcsetattr, close, read, write
#include <sys/ioctl.h> // ioctl
#include <stdio.h> // printf, getchar, fopen, perror
#include <stdlib.h> // exit
#include <sys/stat.h> // read
#include <fcntl.h> // read
#include <signal.h> // signal
#include <time.h> // time
#include <string.h> // memcpy
#include <stdint.h> // int types
#include <sys/time.h> // gettimeofday
#include <unistd.h> // usleep
//#include <pthread.h>
#include "term.h"
#include "usefull_macros.h"
#define LOGBUFSZ (1024)
typedef struct {
int speed; // communication speed in bauds/s
int bspeed; // baudrate from termios.h
} spdtbl;
typedef struct {
char *portname; // device filename (should be freed before structure freeing)
int baudrate; // baudrate (B...)
struct termio oldtty; // TTY flags for previous port settings
struct termio tty; // TTY flags for current settings
int comfd; // TTY file descriptor
int logfd; // log file descriptor
char logbuf[LOGBUFSZ]; // buffer for data readed
int logbuflen; // length of data in logbuf
char linerdy; // flag of getting '\n' in input data
//pthread_t thread; // thread identificator for kill/join
} TTY_descr;
// global mutex for all threads writing to common log file / stdout
//static pthread_mutex_t write_mutex;
// array of opened TTY descriptors
static TTY_descr *descriptors = NULL;
// amount of opened descriptors
static int descr_amount = 0;
// common log fd
static int common_fd = 0;
// max value of comfd - for select()
static int maxfd = 0;
// name of common log file
static char *commonlogname = NULL;
// time of start
static double t0 = -10.;
// character mode
static int charmode = 0;
// in cmdlnopts.c
extern int rewrite_ifexists;
static int tty_init(TTY_descr *descr);
static void restore_ttys();
static void write_logblocks(char force);
/**
* change value of common log filename
*/
void set_comlogname(char* nm){
FREE(commonlogname);
commonlogname = strdup(nm);
}
void set_charmode(){
charmode = 1;
}
//sed 's/[^ ]* *B\([^ ]*\).*/ {\1, B\1},/g'
/*
#define B50 0000001
#define B75 0000002
#define B110 0000003
#define B134 0000004
#define B150 0000005
#define B200 0000006
#define B300 0000007
#define B600 0000010
#define B1200 0000011
#define B1800 0000012
#define B2400 0000013
#define B4800 0000014
#define B9600 0000015
#define B19200 0000016
#define B38400 0000017
#define B57600 0010001
#define B115200 0010002
#define B230400 0010003
#define B460800 0010004
#define B500000 0010005
#define B576000 0010006
#define B921600 0010007
#define B1000000 0010010
#define B1152000 0010011
#define B1500000 0010012
#define B2000000 0010013
#define B2500000 0010014
#define B3000000 0010015
#define B3500000 0010016
#define B4000000 0010017
*/
static spdtbl speeds[] = {
{50, B50},
{75, B75},
{110, B110},
{134, B134},
{150, B150},
{200, B200},
{300, B300},
{600, B600},
{1200, B1200},
{1800, B1800},
{2400, B2400},
{4800, B4800},
{9600, B9600},
{19200, B19200},
{38400, B38400},
{57600, B57600},
{115200, B115200},
{230400, B230400},
{460800, B460800},
{500000, B500000},
{576000, B576000},
{921600, B921600},
{1000000, B1000000},
{1152000, B1152000},
{1500000, B1500000},
{2000000, B2000000},
{2500000, B2500000},
{3000000, B3000000},
{3500000, B3500000},
{4000000, B4000000},
{0,0}
};
/**
* test if `speed` is in .speed of `speeds` array
* if not, exit with error code
* if all OK, return `Bxxx` speed for given baudrate
*/
int conv_spd(int speed){
spdtbl *spd = speeds;
int curspeed = 0;
do{
curspeed = spd->speed;
if(curspeed == speed)
return spd->bspeed;
++spd;
}while(curspeed);
ERRX(_("Wrong speed value: %d!"), speed);
return 0;
}
/**
* Exit & return terminal to old state
* @param ex_stat - status (return code)
*/
void term_quit(int ex_stat){
restore_ttys();
WARNX("Exit! (%d)\n", ex_stat);
exit(ex_stat);
}
/**
* Open & setup terminal
* @param descr (io) - port descriptor
* @return 0 if all OK
*/
static int tty_init(TTY_descr *descr){
DBG("\nOpen port...");
if ((descr->comfd = open(descr->portname, O_RDONLY|O_NOCTTY|O_NONBLOCK)) < 0){
WARN(_("Can't use port %s"), descr->portname);
return globErr ? globErr : 1;
}
DBG("OK\nGet current settings...");
if(ioctl(descr->comfd, TCGETA, &descr->oldtty) < 0){ // Get settings
WARN(_("Can't get old TTY settings"));
return globErr ? globErr : 1;
}
descr->tty = descr->oldtty;
struct termio *tty = &descr->tty;
tty->c_lflag = 0; // ~(ICANON | ECHO | ECHOE | ISIG)
tty->c_oflag = 0;
tty->c_cflag = descr->baudrate|CS8|CREAD|CLOCAL; // 9.6k, 8N1, RW, ignore line ctrl
tty->c_cc[VMIN] = 0; // non-canonical mode
tty->c_cc[VTIME] = 5;
if(ioctl(descr->comfd, TCSETA, &descr->tty) < 0){
WARN(_("Can't apply new TTY settings"));
return globErr ? globErr : 1;
}
if(descr->comfd >= maxfd) maxfd = descr->comfd + 1;
DBG("OK");
return 0;
}
/**
* Restore all opened TTYs to previous state, close them and free all memory
* occupied by their descriptors
*/
static void restore_ttys(){
FNAME();
write_logblocks(1); // write rest of data
for(int i = 0; i < descr_amount; ++i){
TTY_descr *d = &descriptors[i];
DBG("%dth TTY: %s", i, d->portname);
FREE(d->portname);
if(!d->comfd) continue; // not opened
DBG("close file..");
ioctl(d->comfd, TCSANOW, &d->oldtty); // return TTY to previous state
close(d->comfd);
DBG("close log file..");
if(d->logfd > 0)
close(d->logfd);
DBG("done!\n");
}
FREE(descriptors);
descr_amount = 0;
}
/**
* getchar() without echo
* wait until at least one character pressed
* @return character readed
*
int mygetchar(){
int ret;
do ret = read_console();
while(ret == 0);
return ret;
}*/
/**
* read both tty & console
* @param buff (o) - buffer for messages readed from tty
* @param length (io) - buff's length (return readed len or 0)
* @param rb (o) - byte readed from console or -1
* @return 1 if something was readed here or there
*
static int read_tty_and_console(char *buff, size_t *length, int *rb){
ssize_t L;
// ssize_t l;
size_t buffsz = *length;
struct timeval tv;
int sel, retval = 0;
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(STDIN_FILENO, &rfds);
FD_SET(comfd, &rfds);
tv.tv_sec = 0; tv.tv_usec = 10000;
sel = select(comfd + 1, &rfds, NULL, NULL, &tv);
if(sel > 0){
if(FD_ISSET(STDIN_FILENO, &rfds)){
*rb = getchar();
retval = 1;
}else{
*rb = -1;
}
if(FD_ISSET(comfd, &rfds)){
if((L = read(comfd, buff, buffsz)) < 1){ // disconnect or other troubles
WARN(_("TTY error or disconnected!\n"));
}else{
// all OK continue reading
* DBG("readed %zd bytes, try more.. ", L);
buffsz -= L;
while(buffsz > 0 && (l = read(comfd, buff+L, buffsz)) > 0){
L += l;
buffsz -= l;
}
DBG("full len: %zd\n", L); *
*length = (size_t) L;
retval = 1;
}
}else{
*length = 0;
}
}
return retval;
}*/
/*
static void con_sig(int rb){
char cmd;
if(rb < 1) return;
if(rb == 'q') term_quit(0); // q == exit
cmd = (char) rb;
write(comfd, &cmd, 1);
*switch(rb){
case 'h':
help();
break;
default:
cmd = (uint8_t) rb;
write(comfd, &cmd, 1);
}*
}*/
/**
* Create log file (open in exclusive mode: error if file exists)
* @param descr - device descriptor
* @return fd of opened file if all OK, 0 in case of error
*/
int create_log(TTY_descr *descr){
int fd;
char fdname[256], *filedev;
if(!(filedev = strrchr(descr->portname, '/'))) filedev = descr->portname;
else{
++filedev;
if(!*filedev) filedev = descr->portname;
}
snprintf(fdname, 256, "log_%s.txt", filedev);
int oflag = O_WRONLY | O_CREAT;
if(rewrite_ifexists) oflag |= O_TRUNC;
else oflag |= O_EXCL;
if ((fd = open(fdname, oflag,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH )) == -1){
WARN("open(%s) failed", fdname);
return 0;
}
DBG("%s opened", fdname);
descr->logfd = fd;
return fd;
}
/**
* Open terminal & do initial setup
* @param port - port device filename
* @param spd - speed (for ioctl TCSETA)
* @return pointer to descriptor if all OK or NULL in case of error
*/
static TTY_descr *prepare_tty(TTY_descr *descr){
if(!descr->portname) return NULL;
if(tty_init(descr)){
WARNX(_("Can't open device %s"), descr->portname);
return NULL;
}
if(!create_log(descr)) return NULL;
return descr;
}
/**
* read all TTYs, put data into linebuffers & store full lines in log file
* @return 1 if any buffer became full
*/
static int read_ttys(){
struct timeval tv;
int i, sel, retval = 0;
fd_set rfds;
FD_ZERO(&rfds);
for(i = 0; i < descr_amount; ++i)
FD_SET(descriptors[i].comfd, &rfds);
// wait no more than 10ms
tv.tv_sec = 0; tv.tv_usec = 10000;
sel = select(maxfd, &rfds, NULL, NULL, &tv);
TTY_descr *d = descriptors;
if(sel > 0) for(i = 0; i < descr_amount; ++i, ++d){
int bsyctr = 0;
if(FD_ISSET(d->comfd, &rfds)){
size_t L = d->logbuflen;
//DBG("%s got data (have %zd)", d->portname, L);
char *bufptr = d->logbuf + L;
while(L < LOGBUFSZ){
usleep(1000);
if(read(d->comfd, bufptr, 1) < 1){ // disconnect or other troubles
if(errno == EAGAIN){ // file was blocked outside
if(bsyctr++ < 10) continue;
break;
}
WARN(_("Some error or %s disconnected"), d->portname);
break;
}else{
bsyctr = 0;
// all OK continue reading
++L;
if(*bufptr++ == '\n'){ // line ready
d->linerdy = 1;
retval = 1;
break;
}
}
}
descriptors[i].logbuflen = L;
if(L == LOGBUFSZ || charmode) retval = 1; // buffer is full - write data to logs
}
}
return retval;
}
/**
* Open all TTY's from given lists & start monitoring
* @param ports - TTY device filename
* @param speeds - array of speeds or NULL
* @param globspeed - common speed for all ports (if `speeds` not NULL)
*/
void ttys_open(char **ports, int **speeds, int globspeed){
int commonspd = 0, N = 0;
if(!speeds) commonspd = conv_spd(globspeed);
// count amount of ports to open
char **p = ports;
for(descr_amount = 0; *p; ++descr_amount, ++p);
DBG("User wanna open %d descriptors", descr_amount);
descriptors = MALLOC(TTY_descr, descr_amount); // allocate memory for descriptors array
while(*ports){
int spd = commonspd ? commonspd : conv_spd(**speeds);
DBG("open %s with speed %d (%d)", *ports, commonspd ? globspeed : **speeds, spd);
TTY_descr *cur_descr = &descriptors[N++];
cur_descr->portname = strdup(*ports);
cur_descr->baudrate = spd;
if(!prepare_tty(cur_descr)) term_quit(globErr);
++ports;
if(!commonspd) ++speeds;
}
if(commonlogname){ // open common log file - non-critical
int oflag = O_WRONLY | O_CREAT;
if(rewrite_ifexists) oflag |= O_TRUNC; // truncate if -r passed
if ((common_fd = open(commonlogname, oflag,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH )) == -1)
WARN("open(%s) failed", commonlogname);
}
// start monitoring
while(1){
if(read_ttys()) write_logblocks(0);
}
}
/**
* Write all received data into log files
* @param force == 1 to write all data (@ exit)
*/
static void write_logblocks(char force){
TTY_descr *d = descriptors;
char tmbuf[256];
if(t0 < 0.) t0 = dtime();
double twr = dtime() - t0;
for(int i = 0; i < descr_amount; ++i, ++d){
if(charmode || (force && d->logbuflen) || d->linerdy || d->logbuflen == LOGBUFSZ){
// write trailing '\n' if `force` active
int writen = ((force || charmode) && !d->linerdy) ? 1 : 0;
size_t L = snprintf(tmbuf, 256, "%g\n", twr);
write(d->logfd, tmbuf, L);
write(d->logfd, d->logbuf, d->logbuflen);
if(writen) write(d->logfd, "\n", 1);
L = snprintf(tmbuf, 256, "%g: %s\n", twr, d->portname);
write(1, tmbuf, L);
write(1, d->logbuf, d->logbuflen);
if(writen) write(1, "\n", 1);
if(common_fd > 0){
write(common_fd, tmbuf, L);
write(common_fd, d->logbuf, d->logbuflen);
if(writen) write(common_fd, "\n", 1);
}
d->linerdy = 0;
d->logbuflen = 0;
}
}
}