blob: 2c0743c0809eff297fd0258e9aead728a328f242 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
#!/bin/bash
# Compile server manager for systemtap
#
# Copyright (C) 2008 Red Hat Inc.
#
# This file is part of systemtap, and is free software. You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.
# This script publishes its presence on the network and then listens for
# incoming connections. When a connection is detected, the stap-server script
# is run to handle the request.
# Catch ctrl-c
trap 'handle_sigint' SIGINT
#-----------------------------------------------------------------------------
# Helper functions.
#-----------------------------------------------------------------------------
# function: initialization PORT
function initialization {
# Default settings.
tmpdir_prefix_serverd=stap.serverd
avahi_type=_stap._tcp
port=$1
test "X$port" = "X" && port=65000
}
# function: advertise_presence
#
# Advertise the availability of the server on the network.
function advertise_presence {
# Build up a string representing our server's properties.
# TODO: this needs fleshing out.
local sysinfo=`uname -r`
local txt="$sysinfo"
# Call avahi-publish-service to advertise our presence.
avahi-publish-service "Systemtap Compile Server on `uname -n`" \
$avahi_type $port $txt > /dev/null 2>&1 &
echo "Systemtap Compile Server on `uname -n` listening on port $port"
}
# function: listen
#
# Listen for and handle requests to the server.
function listen {
# Work in a temporary directory
tmpdir=`mktemp -dt $tmpdir_prefix_serverd.XXXXXX` || \
fatal "ERROR: cannot create temporary directory " $tmpdir
cd $tmpdir
# Create a fifo for communicating with the server
local fifo_name=$tmpdir_prefix_serverd.fifo
mknod $fifo_name p || \
fatal "ERROR: cannot create temporary fifo " $tmpdir/$fifo_name
# Loop forever accepting requests
while true
do
nc -l $port < $fifo_name | stap-server $((port + 1)) > $fifo_name 2>&1
done
}
# function: fatal [ MESSAGE ]
#
# Fatal error
# Prints its arguments to stderr and exits
function fatal {
echo "$@" >&2
exit 1
}
# function: handle_sigint
#
# Terminate gracefully when SIGINT is received.
function handle_sigint {
echo "$0: received SIGINT. Exiting."
cd `dirname $tmpdir`
rm -fr $tmpdir
exit
}
#-----------------------------------------------------------------------------
# Beginning of main line execution.
#-----------------------------------------------------------------------------
initialization "$@"
advertise_presence
listen
|
