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Continuing in the context of this previous post…
1. Select a static symbol from the R sources, like Connections
$ grep "static Rconnection Connections" src/main/connections.c static Rconnection Connections[NCONNECTIONS];
2. Get its address
$ objdump -t `R RHOME`/bin/exec/R | awk '/ Connections/ {print $1}'
000000000093b700
3. Use the symbol
> library(inline)
> code <- "
+ typedef struct { char *class, *description; } *Rconnection;
+ Rconnection *Connections = (Rconnection*)0x000000000093b700;
+ return mkString(Connections[0]->description);
+ "
> ConZeroDesc <- cfunction(signature(), code, language="C")
> ConZeroDesc()
[1] "stdin"
This effect could probably be prevented by selecting additional compiler and/or and linker options.
P.S. Nice job Oleg Sklyar, Duncan Murdoch, Mike Smith, Dirk Eddelbuettel, Romain Francois with inline-0.3.5
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