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{\colortbl;\red255\green255\blue255;}
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Three steps to attach, and debug in Xcode, a /usr/sbin/mDNSResponder that is already running. One caveat, mDNSResponder has to be built and deployed (using step 1 and 2 below) before it can be attached to Xcode.\
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1.) First you have to build the Xcode project with symbols included and optimizations off.\
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a.) From Terminal shell, open mDNSResponder Xcode project from top of tree: \'a0\
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$ open mDNSMacOSX/mDNSResponder.xcodeproj/\
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\pard\pardeftab720\partightenfactor0
\cf0 You can also just double click on the project from Finder.\
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b.) Add your diffs to mDNSResponder project.
\f1\fs22 \
\pard\pardeftab720\partightenfactor0
\f0\fs24 \cf0 \
c.) Set Strip Linked Product to No and compiler Optimization Level to None. Below shows changed settings.\
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\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
\cf0 \kerning1\expnd0\expndtw0 {{\NeXTGraphic Screen Shot 2015-09-16 at 3.36.23 PM.png \width7680 \height460
}¬}\
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{{\NeXTGraphic Screen Shot 2015-09-16 at 3.46.14 PM.png \width8700 \height460
}¬}\expnd0\expndtw0\kerning0
\
\pard\pardeftab720\partightenfactor0
\cf0 \
d. ) Build mDNSResponder by setting the target to mDNSResponder.\
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{{\NeXTGraphic unknown.png \width4300 \height800 \noorient
}¬}\
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Then execute\'a0Command-B to build.\
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2.) Next, deploy newly-created Xcode version.\
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a.) Go to Terminal shell and type the following: sudo mv \
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b.) Then drag mDNSResponder from Products list on left side panel (shown below using red arrow) to Terminal shell.\
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\pard\pardeftab720\partightenfactor0
\cf0 {{\NeXTGraphic 52D711AF-4055-4867-A494-7E31552BB9E1.png \width4420 \height9700
}¬}\pard\pardeftab720\partightenfactor0
\cf0 \
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c.) Execute command.\
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For example:\
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$ sudo mv\'a0/Volumes/iMac\\ HD/Users/llaier/Library/Developer/Xcode/DerivedData/mDNSResponder-fktewmdupxbxrrdlsdljyhmihboz/Build/Products/mDNSResponder\'a0/usr/sbin/mDNSResponder\
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d.) Restart mDNSResponder by executing the following:\
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$ sudo killall mDNSResponder\
\pard\pardeftab720\partightenfactor0
\f1\fs22 \cf0 \
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\pard\pardeftab720\partightenfactor0
\f0\fs24 \cf0 3.) In Xcode, select Debug > Attach to Process > mDNSResponder.
\f1\fs22 \
\f0\fs24 \
Now set a breakpoint and try to trigger it.\
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