Greetings.
I am trying to receive input from a device connected to the serial port
(/dev/ttyS0) and display it on the gtkTextView widget. However it sometimes
hangs and from using GDB i can say it has something to do with pthreads. I
however am not explicitly using threads for my program. Do i need GAsyncQueue
for this? my code:
in main():
saio1.sa_handler = IOhandler1;
sigemptyset(&saio1.sa_mask);
saio1.sa_flags = 0;
saio1.sa_restorer = NULL;
sigaction(SIGIO,&saio1,NULL);
fcntl(fd1, F_SETOWN, getpid()) ; //which PID monitors 'in' signal
fcntl(fd1, F_SETFL, FASYNC) ; //0 || FASYNC
tcgetattr(fd1,&oldtio1); // save current port settings
newtio1.c_cflag = BAUD | DATABITS | STOPBITS | PARITYON | PARITY |
CLOCAL | CREAD;
newtio1.c_iflag = IGNPAR | IGNBRK;
newtio1.c_oflag = 0;
newtio1.c_lflag = IEXTEN | ISIG; //technically for terminal so wont
make a dif I think.
newtio1.c_cc[VMIN]=1;
newtio1.c_cc[VTIME]=0;
tcflush(fd1, TCIOFLUSH); //clears lines
tcsetattr(fd1,TCSANOW,&newtio1);
void IOhandler1 ()
{
gchar buf1[MYBUFSIZE];
res1 = read(fd1,buf1,MYBUFSIZE-1);
gchar *utfedChar;
gint charCntr;
gsize utfedSize;
GtkTextIter startIter1;
GtkTextIter endIter1;
if (res1>0){ //if actualy GOT input - not necessary but double check.
/*** sleep time required between read to buffer and write from buffer ***/
usleep(10000);
for(charCntr=0 ; charCntr<res1 ; charCntr++){
utfedChar = g_locale_to_utf8 (&buf1[charCntr], 1, &utfedSize, NULL, NULL);
if (utfedChar==NULL || strcmp(utfedChar, "\x0D")==0){
//ignore if character = \x00 /NULL or CR. Gotta replace with other
chars here
;
}
else {
g_print("%s", utfedChar);
gtk_text_buffer_get_bounds (buffer1, &startIter1, &endIter1);
gtk_text_buffer_insert (GTK_TEXT_BUFFER(buffer1), &endIter1,
utfedChar, utfedSize);
}
} //end for
} //end if res1>0
g_free (utfedChar);
tcflush(fd1, TCOFLUSH); //clears lines
}
Thx.
Alvin
---------------------------------
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