tcflush () on SunOS and HP-UX
Alex Vinokur
Hi,
The same program was compiled on SunOS and HP-UX 10.
The program contains the tcflush (...) function.
But for some reason the results of the running
on SunOS and HP-UX 10 are different.
The program works OK on SunOS,
but it seems it isn't OK on HP-UX 10.
Does anybody know what is wrong?
Thanks in advance,
Alex
//#########################################################
//------------------- C++ code : BEGIN -------------------
#include <string>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <termios.h>
int main(void)
{
string s1;
while (1)
{
switch (tcflush(0, TCIFLUSH))
{
case 0 :
// OK
break;
case 1 :
cout << "FATAL ERROR : "
<< (strerror (errno))
<< endl;
exit (1);
break; // unused
default :
abort ();
break; // unused
} // switch (tcflush(0, TCIFLUSH))
cout << "Enter : ";
cin >> s1;
cout << "\tValue = " << s1 << endl;
sleep (5);
}
return 0;
}
//------------------- C++ code : END ----------------------
//#########################################################
//------------------- Running Results : BEGIN -------------
//------------------- SunOS -------------------------------
//=== Running ====
%a.out
Enter : aaaaa // aaaaa is input data
Value = aaaaa
bbbbb // bbbbb is input data
ccccc // ccccc is input data
Enter : ddddd // ddddd is input data
Value = ddddd
cntrl-c
//=== Conclusion ====
The data, received but not read, are flushed : bbbbb, ccccc
//------------------- SunOS -------------------------------
//------------------- Running Results : END ---------------
//#########################################################
//------------------- Compiler & System ------------------
//------------------- SunOS -------------------------------
g++ -v : gcc version egcs-2.91.57 19980901
(egcs-1.1 release)
uname -a : SunOS <nodename> 5.6 Generic_105181-09
sun4m sparc SUNW,SPARCstation-5
//---------------------------------------------------------
//#########################################################
//#########################################################
//------------------- Running Results : BEGIN -------------
//------------------- HP-UX -------------------------------
//=== Running ====
%a.out
Enter : aaaaa // aaaaa is input data
Value = aaaaa
bbbbb // bbbbb is input data
ccccc // ccccc is input data
Enter : Value = bbbbb // ???
Enter : Value = ccccc // ???
Enter : ddddd // ddddd is input data
Value = ddddd
cntrl-c
//=== Conclusion ====
No data are flushed.
//------------------- HP-UX -------------------------------
//------------------- Running Results : END ---------------
//#########################################################
//------------------- Compiler & System ------------------
//------------------- HP-UX -------------------------------
g++ -v : gcc version 2.8.1
aCC : HP aC++ B3910B A.01.06
HP aC++ B3910B A.01.01 Support Library
Note! The same results were obtained using both g++ and aCC.
uname -a : HP-UX <nodename> B.10.20 A 9000/847
1410304272 two-user license
//---------------------------------------------------------
//#########################################################
##################################################################
############## SunOS information (BEGIN) #########################
##################################################################
SunOS 5.6
Last change: 29 Dec 1996
##################################################################
man tcflush contains the following information :
================================================
NAME
tcflush - flush non-transmitted output data, non-read input
data or both
SYNOPSIS
#include <termios.h>
int tcflush(int fildes, int queue_selector);
DESCRIPTION
Upon successful completion, tcflush() discards data written
to the object referred to by fildes (an open file descriptor
associated with a terminal) but not transmitted, or data
received but not read, depending on the value of
queue_selector:
o If queue_selector is TCIFLUSH it flushes data received but
not read.
[snip]
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is
returned and errno is set to indicate the error.
[snip]
##################################################################
############## SunOS information (END) ###########################
##################################################################
##################################################################
############## HP-UX information (BEGIN) #########################
##################################################################
Hewlett-Packard Company
HP-UX Release 10.20: July 1996
##################################################################
man tcflush contains the following information :
================================================
NAME
tcsendbreak(), tcdrain(), tcflush(), tcflow() - tty line control
functions
SYNOPSIS
#include <termios.h>
[snip]
int tcflush(int fildes, int queue_selector);
[snip]
DESCRIPTION
[snip]
tcflush() discards data written to fildes but not transmitted, or data
received but not read, depending on the value of queue_selector:
+ If queue_selector is TCIFLUSH, data received but not read is
flushed.
[snip]
RETURN VALUE
Upon successful completion, a value of zero is returned. Otherwise, a
value of -1 is returned and errno is set to indicate the error.
[snip]
##################################################################
############## HP-UX information (END) ###########################
##################################################################
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