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Full Discussion: How to send data to previous program (pipe)?
Top Forums Shell Programming and Scripting How to send data to previous program (pipe)? Post 303013049 by JackK on Wednesday 14th of February 2018 07:52:30 AM
Old 02-14-2018
Quote:
Originally Posted by Corona688
Code:
#!/bin/bash

exec 1>&3 # Save stdout into FD 3 if we need it
mkfifo /tmp/$$

echo "fifo is /tmp/$$"
#...

I have an error:
Quote:
$ ./test.sh
./test.sh: line 3: 3: Bad file descriptor
fifo is /tmp/28226
---------- Post updated at 03:52 PM ---------- Previous update was at 03:12 PM ----------

Hello, Don Cragun.
Your "example of using the presence of a file to act as a semaphore..." is ok. However, I need to interact with sqlplus in a normal way (from its inner prompt) also => interactively.
Do you have any idea how may I start sqlplus to instruct it to read an input from some file when the file is not empty and allow the user to do normal commands from prompt like below?
Code:
SQL*Plus: Release 11.2.0.4.0 Production on Wed Feb 14 13:45:42 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.
SQL>

In your example we can create cmd1 exactly as we wish it to behave. This is not the case when sqlplus is put instead of cmd1.
 

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LEARN ABOUT REDHAT

pvm_setsbuf

SETSBUF(3PVM)							  PVM Version 3.4						     SETSBUF(3PVM)

NAME

       pvm_setsbuf - Switches the active send buffer.

SYNOPSIS

       C    int oldbuf = pvm_setsbuf( int bufid )

       Fortran	 call pvmfsetsbuf( bufid, oldbuf )

PARAMETERS

       bufid   Integer the message buffer identifier for the new active send buffer.  A value of 0 indicates the default receive buffer.

       oldbuf  Integer returning the message buffer identifier for the previous active send buffer.

DESCRIPTION

       The  routine  pvm_setsbuf  switches the active send buffer to bufid and saves the previous active send buffer oldbuf.  If bufid is set to 0
       then the present active send buffer is saved and no active send buffer exists.

       The routine is required when managing multiple message buffers.	For example switching back and forth  between  two  buffers.   One  buffer
       could be used to send information to a graphical interface while a second buffer could be used send data to other tasks in the application.

EXAMPLES

       C:
	    sbuf1 = pvm_setsbuf( sbuf2 );
       Fortran:
	    CALL PVMFSETSBUF( NEWBUF, OLDBUF )

ERRORS

       These error conditions can be returned by pvm_setsbuf

       PvmBadParam
	      giving an invalid bufid.

       PvmNoSuchBuf
	      switching to a non-existent message buffer.

SEE ALSO

       pvm_setrbuf(3PVM)

								  30 August, 1993						     SETSBUF(3PVM)
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