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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LEARN ABOUT OSF1
tcsetattr
tcsetattr(3) Library Functions Manual tcsetattr(3)
NAME
tcsetattr - Sets the parameters associated with the terminal
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <termios.h>
int tcsetattr(
int filedes,
int optional_actions,
struct termios *termios_p );
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
tcsetattr(): 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. Specifies the options defining how the parameters will be set. Points to a
termios structure containing the terminal parameters.
DESCRIPTION
The tcsetattr() function sets the parameters associated with the terminal referred to by the open file descriptor filedes from the termios
structure referenced by termios_p as follows: If optional_actions is TCSANOW, the change will occur immediately. If optional_actions is
TCSADRAIN, the change will occur after all output written to filedes has been transmitted. This function should be used when changing
parameters that affect output. If optional_actions is TCSAFLUSH, the change will occur after all output written to filedes has been trans-
mitted, and all input so far received but not read will be discarded before the change is made.
If the output baud rate stored in the termios structure pointed to by the termios_p parameter is the zero baud rate, B0, the modem control
lines will no longer be asserted. Normally, this will disconnect the line.
If the input baud rate stored in the termios structure pointed to by the termios_p parameter is 0 (zero), the input baud rate given to the
hardware will be the same as the output baud rate stored in the termios structure.
Attempts to use the tcsetattr() function from a process which is a member of a background process group on a filedes associated with its
controlling terminal causes the process group to be sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU signals,
the process is allowed to perform the operation and no signal is sent.
RETURN VALUES
Upon successful completion, 0 (zero) is returned. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The tcsetattr() function sets errno to the specified values for the following conditions:
The filedes parameter is not a valid file descriptor. A signal interrupted tcsetattr(). The optional_actions parameter is not a proper
value, or an attempt was made to change an attribute represented in the termios structure to an unsupported value. The file associated
with the filedes parameter is not a terminal.
RELATED INFORMATION
Functions: cfgetispeed (3), tcgetattr (3)
Standards: standards(5) delim off
tcsetattr(3)