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From: root@MCIRPS2.MED.NYU.EDU
Newsgroups: comp.sys.sgi
Subject: Timeout on serial port read
Message-ID: <9005021809.AA29051@mcirps2.med.nyu.edu>
Date: 3 May 90 04:34:06 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 34
X-Unparsable-Date: Wed, 2 May 90 11:09:29 DSD


I am trying to set the ioctl call so that a raw read from a
serial port will time out after a few seconds. No matter what I
set the TIME value for in the control structure, the machine
still hangs waiting for characters. What am I doing wrong, if anything.

Code follows:
---
    new_settings.c_iflag = IGNBRK | IGNPAR;
    new_settings.c_oflag = NULL;
    new_settings.c_cflag = B9600 | CS8 | CREAD | CLOCAL;
    new_settings.c_lflag = ICANON;
    new_settings.c_line  = NULL;
    new_settings.c_cc[0] = NULL;
    new_settings.c_cc[1] = NULL;
    new_settings.c_cc[2] = NULL;
    new_settings.c_cc[3] = NULL;
    new_settings.c_cc[4] = NULL;
    new_settings.c_cc[5] = TIMEOUT;

    ioctl(fd, TCSETA, &new_settings);
-----

A read that has timed out should return with a value of 0. Right ?

dan.
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| karron@nyu.edu                          Dan Karron                          |
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