nexmon – Blame information for rev 1
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | office | 1 | #! /bin/bash |
| 2 | # source: cat2.sh |
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| 3 | # Copyright Gerhard Rieger 2009 |
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| 4 | # Published under the GNU General Public License V.2, see file COPYING |
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| 5 | |||
| 6 | # This is an example script that shows how to write a script for use with socat |
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| 7 | # intermediate addresses. it shows a simple case consisting of two |
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| 8 | # unidirectional programs. |
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| 9 | # note how the n>&- and n<&- controls are used to close FDs on sub processes |
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| 10 | # to make half close possible. |
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| 11 | |||
| 12 | # uncomment this if you want to analyse which file descriptors are open |
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| 13 | #filan -s -o+2; sleep 1; echo |
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| 14 | |||
| 15 | # these are the "right side" file descriptors provided by socat; 0 and 1 are |
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| 16 | # the "left side" FDs |
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| 17 | RINFD=3 |
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| 18 | ROUTFD=4 |
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| 19 | |||
| 20 | if true; then |
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| 21 | |||
| 22 | # this is a typical example. |
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| 23 | #these work fine |
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| 24 | socat -u - - <&3 3<&- 4>&- & # right (3) to left (1) |
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| 25 | socat -u - - <&0 >&4 4>&- 3<&- & # left (0) to right (4) |
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| 26 | #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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| 27 | #cat <&0 1>&- >&4 4>&- 3<&- & # left (0) to right (4) |
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| 28 | exec 1>&- 4>&- |
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| 29 | exec 0<&- 3<&- |
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| 30 | |||
| 31 | elif false; then |
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| 32 | |||
| 33 | # works except close in reverse direction |
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| 34 | cat <&3 3<&- 4>&- & # right (3) to left (1) |
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| 35 | exec cat <&0 1>&- >&4 4>&- 3<&- # left (0) to right (4) |
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| 36 | |||
| 37 | elif true; then |
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| 38 | |||
| 39 | # works - forw, rev |
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| 40 | #socat $SOCAT_OPTS -u fd:$RINFD - </dev/null 4>&- & # right to left |
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| 41 | #socat $SOCAT_OPTS -u - fd:$ROUTFD >/dev/null 3<&- & # left to right |
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| 42 | exec 1>&- 4>&- |
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| 43 | exec 0<&- 3<&- |
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| 44 | |||
| 45 | elif false; then |
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| 46 | |||
| 47 | # works - forw, rev |
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| 48 | socat -u - - <&3 3<&- 4>&- & # right (3) to left (1) |
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| 49 | exec socat -u - - <&0 1>&- >&4 4>&- 3<&- # left (0) to right (4) |
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| 50 | |||
| 51 | else |
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| 52 | |||
| 53 | # works except close in reverse |
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| 54 | #filan -s -o+2 <&3 3<&- 4>&- & # right (3) to left (1) |
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| 55 | cat <&3 3<&- 4>&- & # right (3) to left (1) |
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| 56 | #socat -d -d -d -d -u - - <&3 3<&- 4>&- & # right (3) to left (1) |
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| 57 | |||
| 58 | #sleep 1; echo >&2; filan -s -o+2 <&0 >&4 4>&- 3<&- & # left (0) to right (4) |
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| 59 | #cat <&0 >&4 4>&- 3<&- & # left (0) to right (4) |
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| 60 | socat -u - - <&0 >&4 4>&- 3<&- & # left (0) to right (4) |
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| 61 | |||
| 62 | exec 1>&- 4>&- |
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| 63 | exec 0<&- 3<&- |
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| 64 | #sleep 1; echo >&2; filan -s -o+2 |
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| 65 | |||
| 66 | fi |
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| 67 | |||
| 68 | wait |