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68 lines
2.1 KiB
Bash
Executable file
68 lines
2.1 KiB
Bash
Executable file
#! /bin/bash
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# source: cat2.sh
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# Copyright Gerhard Rieger 2009
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# Published under the GNU General Public License V.2, see file COPYING
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# This is an example script that shows how to write a script for use with socat
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# intermediate addresses. it shows a simple case consisting of two
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# unidirectional programs.
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# note how the n>&- and n<&- controls are used to close FDs on sub processes
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# to make half close possible.
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# uncomment this if you want to analyse which file descriptors are open
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#filan -s -o+2; sleep 1; echo
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# these are the "right side" file descriptors provided by socat; 0 and 1 are
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# the "left side" FDs
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RINFD=3
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ROUTFD=4
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if true; then
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# this is a typical example.
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#these work fine
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socat -u - - <&3 3<&- 4>&- & # right (3) to left (1)
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socat -u - - <&0 >&4 4>&- 3<&- & # left (0) to right (4)
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#strace -o /tmp/cat.strace -v -tt -f -F -x -s 1024 cat <&3 3<&- 4>&- & # right (3) to left (1)
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#cat <&0 1>&- >&4 4>&- 3<&- & # left (0) to right (4)
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exec 1>&- 4>&-
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exec 0<&- 3<&-
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elif false; then
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# works except close in reverse direction
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cat <&3 3<&- 4>&- & # right (3) to left (1)
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exec cat <&0 1>&- >&4 4>&- 3<&- # left (0) to right (4)
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elif true; then
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# works - forw, rev
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#socat $SOCAT_OPTS -u fd:$RINFD - </dev/null 4>&- & # right to left
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#socat $SOCAT_OPTS -u - fd:$ROUTFD >/dev/null 3<&- & # left to right
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exec 1>&- 4>&-
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exec 0<&- 3<&-
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elif false; then
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# works - forw, rev
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socat -u - - <&3 3<&- 4>&- & # right (3) to left (1)
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exec socat -u - - <&0 1>&- >&4 4>&- 3<&- # left (0) to right (4)
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else
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# works except close in reverse
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#filan -s -o+2 <&3 3<&- 4>&- & # right (3) to left (1)
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cat <&3 3<&- 4>&- & # right (3) to left (1)
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#socat -d -d -d -d -u - - <&3 3<&- 4>&- & # right (3) to left (1)
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#sleep 1; echo >&2; filan -s -o+2 <&0 >&4 4>&- 3<&- & # left (0) to right (4)
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#cat <&0 >&4 4>&- 3<&- & # left (0) to right (4)
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socat -u - - <&0 >&4 4>&- 3<&- & # left (0) to right (4)
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exec 1>&- 4>&-
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exec 0<&- 3<&-
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#sleep 1; echo >&2; filan -s -o+2
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fi
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wait
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