topic Re: Termios is freezing in Operating System - Linux

Termios is freezing

hem c reddy — Sat, 22 Apr 2006 06:06:27 GMT

Hi,

I have the following small program which read password from user after echoing off. But the problem is, it is freezing for some time (not sure about the duration) before going to the next statement and I have to press "enter" multiple times (maximum 4, it is not consistent though). I am trying it on a hp-ux machine with aCC compiler.

Any pointers/help would be greatly appreciated.

#include
#include
#include
#include

int main(int argc, char *argv[])
{
struct termios oldt,
newt;
char ch;
char userpasswd[50];

printf("enter password:");
tcgetattr( STDIN_FILENO, &oldt );
newt = oldt;
newt.c_lflag &= ~( ICANON | ECHO );
tcsetattr( STDIN_FILENO, TCSANOW, &newt );
gets(userpasswd);
tcsetattr( STDIN_FILENO, TCSANOW, &oldt );
printf("\nPassword enetered %s\n", userpasswd);
return 0;
}

Thanks,
Reddy
Edit/Delete Message

Re: Termios is freezing

Arunvijai_4 — Sat, 22 Apr 2006 08:29:25 GMT

HI Reddy,

You can try running your program under tusc to see where and what system call it hangs,

http://hpux.connect.org.uk/hppd/hpux/Sysadmin/tusc-7.8/

-Arun

Re: Termios is freezing

A. Clay Stephenson — Sat, 22 Apr 2006 16:55:48 GMT

There is a function getpass() that will do all of this for you. Man getpass() for details.

I suspect that your problem stems from the use of TCSANNOW rather than TCSAFLUSH.

Re: Termios is freezing

hem c reddy — Thu, 27 Apr 2006 04:54:59 GMT

I removed ICANON from "newt.c_lflag &= ~( ICANON | ECHO )" and is not
working fine.

Thank you very much for your responses..

Regards,
Reddy

Re: Termios is freezing

hem c reddy — Thu, 27 Apr 2006 04:58:51 GMT

I have got my problem solved