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Annotation of coherent/a/usr/man/COHERENT/namedpipe, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: named pipe                  Definition                 named pipe
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        !             8: A  _n_a_m_e_d  _p_i_p_e  is  a  special  file  created  with  the  command
        !             9: /eettcc/mmkknnoodd. Unlike the block- and character-special files created
        !            10: by mmkknnoodd, a named pipe is not a device.
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        !            12: A named pipe acts like a conventional pipe set up between related
        !            13: processes.  It differs in that it  has a visible name that can be
        !            14: seen  in  a  file  system.   It  also  differs  in  that  it  has
        !            15: permissions (since it's a file and has a name) associated with it
        !            16: just  like  any other  file.   This  allows a  named  pipe to  be
        !            17: accessed by processes that are _n_o_t related to each other, and can
        !            18: even  be  used  for  processes  that  are running  on  behalf  of
        !            19: difference users.
        !            20: 
        !            21: The following  illustrates how one process can  write data into a
        !            22: named pipe and an unrelated process can read from it:
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        !            24: 
        !            25:      /etc/mknod my_pipe p     # create the named pipe
        !            26:      chmod 644 my_pipe
        !            27:      ls -lR / > my_pipe &     # pump data into pipe in background
        !            28:      mail fred < my_pipe      # read from the pipe and process
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        !            30: 
        !            31: This script  creates a named  pipe called mmyy_ppiippee  and makes sure
        !            32: that it is  readable; it then pumps a mass  of data into the pipe
        !            33: (in the  background), and then  has a process read  data from the
        !            34: named pipe  and perform some  action on them (in  this case, mail
        !            35: the data  to use ffrreedd).  In this example,  the mmaaiill process could
        !            36: be  running from  some other  login  and could  either be  in the
        !            37: foreground or background.
        !            38: 
        !            39: ***** See Also *****
        !            40: 
        !            41: ddeeffiinniittiioonnss, mmkknnoodd, ppiippee
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        !            64: COHERENT Lexicon                                           Page 1
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