int main(void)
{
char buf[BUFLEN];
int got, i, lib_console_dev, ldev;
/* Determine the SAPC's "console" device, the serial port for user i/o */
lib_console_dev = sys_get_console_dev(); /* SAPC support lib fn */
switch(lib_console_dev) {
case COM1: ldev = TTY0; /* convert to our dev #'s */
break;
case COM2: ldev = TTY1;
break;
default: printf("Unknown console device\n");
return 1;
}
kprintf("Running with device TTY%d\n",ldev);
/* Now have a usable device to talk to with i/o package-- */
kprintf("\nTrying system call write(4 chars)...\n");
got = write(ldev,"hi!\n",4);
kprintf("write of 4 returned %d\n",got);
kprintf("Trying longer system call write (9 chars)\n");
got = write(ldev, "abcdefghi", 9);
kprintf("write of 9 returned %d\n",got);
for (i = 0; i < BUFLEN; i++)
buf[i] = 'A'+ i/2;
kprintf("\nTrying write of %d-char string...\n", BUFLEN);
got = write(ldev, buf, BUFLEN); /* will write 80 chars*/
kprintf("\nwrite returned %d\n", got);
kprintf("\nType 10 chars input to test typeahead while looping for delay...\n");
got = read(ldev, buf, 10); /* will read 10 chars*/
kprintf("\nGot %d chars into buf. Trying write of buf...\n", got);
write(ldev, buf, got);
kprintf("\nTrying another 10 chars read right away...\n");
got = read(ldev, buf, 10); /* will wait for input */
kprintf("\nGot %d chars on second read\n",got);
if (got == 0)
kprintf("nothing in buffer\n");
else
write(ldev, buf, got); /* will write 10 chars*/
kprintf("\n\nNow turning echo off--\n");
kprintf("\nType 20 chars input, note lack of echoes...\n");
got = read(ldev, buf, 20);
kprintf("\nTrying write of buf...\n");
write(ldev, buf, got);
kprintf("\nAsked for 20 characters; got %d\n", got);
return 0;
}
int main(void)
{
char buf[BUFLEN];
int got, lib_console_dev, ldev;
/* Determine the SAPC's "console" device, the serial port for user i/o */
lib_console_dev = sys_get_console_dev(); /* SAPC support lib fn */
switch(lib_console_dev) {
case COM1: ldev = TTY0; /* convert to our dev #'s */
break;
case COM2: ldev = TTY1;
break;
default: printf("Unknown console device\n");
return 1;
}
kprintf("Running with device TTY%d\n",ldev);
/* Now have a usable device to talk to with i/o package-- */
kprintf("\nTrying simple write(4 chars)...\n");
got = write(ldev,"hi!\n",4);
kprintf("write of 4 returned %d\n",got);
delay(); /* time for output to finish, once write-behind is working */
kprintf("Trying longer write (9 chars)\n");
got = write(ldev, "abcdefghi", 9);
kprintf("write of 9 returned %d\n",got);
delay(); /* time for output to finish, once write-behind is working */
kprintf("\nType 10 chars input to test typeahead while looping for delay...\n");
delay();
got = read(ldev, buf, 10); /* should wait for all 10 chars, once fixed */
kprintf("\nGot %d chars into buf. Trying write of buf...\n", got);
write(ldev, buf, got);
delay();
exit(1);
kprintf("this is after exit");
}
