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UNIX for Advanced & Expert Users
Not able to Display the Catched Signal
Post 302688761 by Don Cragun on Monday 20th of August 2012 06:41:28 AM
08-20-2012
Quote:
Most vendor man page set will have a termios man page (but the section it is in will vary). Chapter 11 of the Base Definitions volume of the current POSIX standard has more than a dozen pages describing the General Terminal Interface (GTI).
The extremely quick overview, is that any time you have a user typing on a keyboard to interactively enter input into a program and interactively looking at output produced by a program on a screen or typewriter-like device, you are likely using a tty device or pseudo-tty device that behaves mostly as specified by the POSIX GTI.
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LEARN ABOUT POSIX
pty
PTY(4) BSD Kernel Interfaces Manual PTY(4) NAME
pty -- BSD-style compatibility pseudo-terminal driver SYNOPSIS
device pty DESCRIPTION
The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals. When the device /dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver. A device node for this terminal shall be created, which has the name /dev/ttyXX. New code should not try to allocate pseudo-terminals using this interface. It is only provided for compatibility with older C libraries that tried to open such devices when posix_openpt(2) was being called. FILES
The BSD-style compatibility pseudo-terminal driver uses the following device names: /dev/pty[l-sL-S][0-9a-v] Pseudo-terminal master devices. /dev/tty[l-sL-S][0-9a-v] Pseudo-terminal slave devices. DIAGNOSTICS
None. SEE ALSO
posix_openpt(2), pts(4), tty(4) HISTORY
A pseudo-terminal driver appeared in 4.2BSD. BUGS
Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused. A call to stat(2) on a nonexistent master device will already cause a new master device node to be created. The master device can only be destroyed by opening and closing it. The pty driver cannot be unloaded, because it cannot determine if it is being used. BSD
August 20, 2008 BSD