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    The following form allows you to view linux man pages.

    Command:

    ptmx

    
    
    

    DESCRIPTION

           The  file  /dev/ptmx  is a character file with major number 5 and minor
           number 2, usually of mode 0666 and owner.group  of  root.root.   It  is
           used to create a pseudoterminal master and slave pair.
    
           When  a  process opens /dev/ptmx, it gets a file descriptor for a pseu-
           doterminal master (PTM), and a pseudoterminal  slave  (PTS)  device  is
           created  in  the  /dev/pts directory.  Each file descriptor obtained by
           opening /dev/ptmx is an independent PTM with its  own  associated  PTS,
           whose path can be found by passing the descriptor to ptsname(3).
    
           Before  opening  the  pseudoterminal  slave, you must pass the master's
           file descriptor to grantpt(3) and unlockpt(3).
    
           Once both the pseudoterminal master and slave are open, the slave  pro-
           vides  processes  with an interface that is identical to that of a real
           terminal.
    
           Data written to the slave is presented  on  the  master  descriptor  as
           input.   Data written to the master is presented to the slave as input.
    
           In practice, pseudoterminals are used for implementing terminal  emula-
           tors  such as xterm(1), in which data read from the pseudoterminal mas-
           ter is interpreted by the application in the same way a  real  terminal
           would  interpret  the  data, and for implementing remote-login programs
           such as sshd(8), in which data read from the pseudoterminal  master  is
           sent across the network to a client program that is connected to a ter-
           minal or terminal emulator.
    
           Pseudoterminals can also be used to send input to  programs  that  nor-
           mally refuse to read input from pipes (such as su(1), and passwd(1)).
    
    
    

    FILES

           /dev/ptmx, /dev/pts/*
    
    
    

    NOTES

           The  Linux  support for the above (known as UNIX 98 pseudoterminal nam-
           ing) is done using the devpts filesystem, that  should  be  mounted  on
           /dev/pts.
    
           Before   this  UNIX  98  scheme,  master  pseudoterminals  were  called
           /dev/ptyp0, ...  and slave pseudoterminals  /dev/ttyp0,  ...   and  one
           needed lots of preallocated device nodes.
    
    
    

    SEE ALSO

           getpt(3), grantpt(3), ptsname(3), unlockpt(3), pty(7)
    
    
    

    Linux 2002-10-09 PTS(4)

    
    
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