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add diagrams of typical io plumbing #42

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181 changes: 181 additions & 0 deletions README.plumbing
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Original file line number Diff line number Diff line change
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svscanboot

..................
: svscanboot :
: :
null---> out>---null
: err>---null
:................:


===============================================================================

svscan

mkdir -p /service /svc0
cat <<EOF > /svc0/run
#!/bin/sh
exec /bin/sleep 9999
EOF
ln -s /svc0 /service/svc0
svscanboot &

................. .....................
: svscan : : readproctitle :
: : : :
null--->in out>--*---*------>in out>---null
: err>--' | : err>---null
:...............: | :...................:
|
................. |
: supervise : |
: : |
null--->in out>--*---*
: err>--' |
:...............: |
|
................. |
: main : |
: process : |
: : |
null--->in out>--*---'
: err>--'
:...............:


===============================================================================

svscan log management

mkdir -p /service /svc1 /svc1/log
cat <<EOF > /svc1/run
#!/bin/sh
exec /bin/sleep 9999
EOF
cat <<EOF > /svc1/log/run
#!/bin/sh
exec /bin/sleep 9999
EOF
ln -s /svc1 /service/svc1
svscanboot &

.............. .....................
: svscan : : readproctitle :
: : : :
null--->in out>--*-----------*---->in out>---null
: err>--' | : err>---null
.--->copy copy>-----. | :...................:
| :............: | |
`----------------------* *---------------------------.
| | |
................. | | ................. |
: supervise : | | : supervise : |
: : | | : : |
null--->in out>---*--------)---->in out>--*---*
: err>---)--------* : err>--' |
:...............: | | :...............: |
| | |
................. | | ................. |
: main : | | : log : |
: process : | | : process : |
: : | | : : |
null--->in out>---*--------)---->in out>--*---'
: err>------------' : err>--'
:...............: :...............:


===============================================================================

supervise log management

mkdir -p /service /svc2
cat <<EOF > /svc2/run
#!/bin/sh
exec /bin/sleep 9999
EOF
cat <<EOF > /svc2/log
#!/bin/sh
exec /bin/sleep 9999
EOF
ln -s /svc2 /service/svc2
svscanboot &

.............. .....................
: svscan : : readproctitle :
: : : :
null--->in out>---*----------*---->in out>---null
: err>---' | : err>---null
:............: | :...................:
|
................. |
: supervise : |
: : |
null--->in out>---*--------*-----------------------.
: err>---' | |
.--->copy copy>---. | |
| :...............: | | |
`-----------------------* | |
| | |
............... | | ............... |
: main : | | : log : |
: process : | | : process : |
: : | | : : |
null--->in out>----*--------)----->in out>---*
: err>-------------' : err>---'
:.............: :.............:


===============================================================================

combination svscan and supervise log management

mkdir -p /service /svc3 /svc3/log
cat <<EOF > /svc3/run
#!/bin/sh
exec /bin/sleep 9999
EOF
cat <<EOF > /svc3/log/run
#!/bin/sh
exec /bin/sleep 9999
EOF
cat <<EOF > /svc3/log/log
#!/bin/sh
exec /bin/sleep 9999
EOF
ln -s /svc3 /service/svc3
svscanboot &

.............. .....................
: svscan : : readproctitle :
: : : :
null--->in out>-----*----*------->in out>---null
: err>-----' | : err>---null
.--->copy copy>-----. | :...................:
| :............: | |
`----------------------* *---------------------------------.
| | |
................. | | ................. |
: supervise : | | : supervise : |
: : | | : : |
null--->in out>---*----)--------->in out>---*---*
: err>---)----* : err>---' |
:...............: | | .---->copy copy>---. |
| | | :...............: | |
| | *------------------------* |
| | | | |
............... | | | ................ | |
: main : | | | : log main : | |
: process : | | | : : | |
: : | | | : : | |
null--->in out>----*----)----)---->in out>----' |
: err>---------' | : err>--------*
:.............: | :..............: |
| |
| ............... |
| : log log : |
| : : |
`---->in out>-----*---'
: err>-----'
:.............: