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I know I could write an interposer to watch the arguments being passed to the strncpy library call, but it seems like this should be easy to do with DTrace.

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Here's a working variant (tested on Mac only):

 #!/usr/sbin/dtrace -s pid$target::strncpy:entry { printf( "%s( %X, %s, %lld )\n", probefunc, arg0, copyinstr(arg1), arg2 ); }

copyinstr is required since the string comes from userland into the kernel.

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