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Homework and Emergencies Homework & Coursework Questions C shell program Post 303015377 by Don Cragun on Tuesday 3rd of April 2018 08:30:03 PM
Old 04-03-2018
In addition to using functions that get characters (rather than lines) from a file, you'll also need to put the input file descriptor into raw (rather than cooked) input mode if you want to read characters from a terminal device without waiting for a full line to be entered. Look at the man pages for tcgetattr(), tcsetattr(), and termios.h to see how to do this.
 

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tcgetattr(3)						     Library Functions Manual						      tcgetattr(3)

NAME
tcgetattr - Gets the parameters associated with the terminal LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <termios.h> int tcgetattr ( int filedes, struct termios *termios_p ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: tcgetattr(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies an open file descriptor associated with a terminal. Points to a termios structure. DESCRIPTION
The tcgetattr() function gets the parameters associated with the object referenced by the filedes parameter and stores them in the termios structure referenced by the termios_p parameter. If the device does not support split baud rates, the input baud rate stored in the termios structure will be 0 (zero). The tcgetattr() function may be called from any process. RETURN VALUES
Upon successful completion, 0 (zero) is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
The tcgetattr() function sets errno to the specified values for the following conditions: The filedes parameter is not a valid file descriptor. The file associated with the filedes parameter is not a terminal. RELATED INFORMATION
Functions: tcsetattr(3) Files: termios(4) Standards: standards(5) delim off tcgetattr(3)
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