Mercurial > hg > rlgwebd
annotate rlgwebd @ 165:59e62710cbb5
rlgwebd.js: prevent races when reading ttyrecs.
DglSession objects read a 12-byte TTYREC header, extract therefrom the
length of the data chunk, and then read the data. In between these two
reads, the file watcher could trigger another readchunk() invocation,
which might attempt to read a header from the beginning of the data
chunk. This usually results in expecting a data chunk of several GB
and failing to create a Buffer for it.
The race is remedied by setting a flag on the DglSession object
whenever readchunk() is called, clearing it when both reads complete,
and refusing to read if it is already set.
author | John "Elwin" Edwards |
---|---|
date | Wed, 07 Jan 2015 13:18:35 -0500 |
parents | 1a156a7746a7 |
children | 5483d413a45b |
rev | line source |
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139 | 1 #!/bin/sh |
2 | |
141
1a156a7746a7
RLGWebD: use NODE_PATH to find modules.
John "Elwin" Edwards
parents:
139
diff
changeset
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3 NODE_PATH=/usr/lib/node_modules |
139 | 4 LOGFILE=/var/local/rlgwebd/log |
5 CTLSOCKET=/var/local/rlgwebd/ctl | |
6 RLGWEBDJS=./rlgwebd.js | |
7 | |
141
1a156a7746a7
RLGWebD: use NODE_PATH to find modules.
John "Elwin" Edwards
parents:
139
diff
changeset
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8 export NODE_PATH |
1a156a7746a7
RLGWebD: use NODE_PATH to find modules.
John "Elwin" Edwards
parents:
139
diff
changeset
|
9 |
139 | 10 if [ $UID != 0 ] |
11 then | |
12 echo "$0 needs to run as root." >&2 | |
13 exit 1 | |
14 fi | |
15 | |
16 if [ $# -gt 0 ] && [ $1 = stop ] | |
17 then | |
18 socat "EXEC:echo quit" "$CTLSOCKET" | |
19 else | |
20 # Start | |
21 setsid node "$RLGWEBDJS" </dev/null &>>$LOGFILE & | |
22 fi | |
23 | |
24 exit | |
25 |