<div>
<div class="content wysiwyg-content">
How do you implement a timeout in Unix???<br />
&nbsp; <br />
Let me explain what I am trying to do:<br />
&nbsp; <br />
I've opened a device file (serial port - connected to a modem) for I/O. I am communicating with a terminal (phone) which also has a modem. I need to wait for a response from the terminal after having sent a command. So I do a 'write' to the device file to send the command to the terminal, and do a 'read' from the device to get the response. I want to wait, let us say, only 15 seconds for the response, HOW DO I DO IT?<br />
&nbsp; <br />
I am using the standard 'read' and 'write' routines. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
</div>
</div>


How do you implement a timeout in Unix???
  
Let me explain what I am trying to do:
  
I've opened a device file (serial port - connected to a modem) for I/O. I am communicating with a terminal (phone) which also has a modem. I need to wait for a response from the terminal after having sent a command. So I do a 'write' to the device file to send the command to the terminal, and do a 'read' from the device to get the response. I want to wait, let us say, only 15 seconds for the response, HOW DO I DO IT?
  
I am using the standard 'read' and 'write' routines.                                 

Timeout in UNIX

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.