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1 /** ===========================================================================
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2 ** R-Package: rdyncall
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3 ** File: src/rdynload.c
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4 ** Description: R bindings to dynload
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5 **/
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6
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7 #include <Rinternals.h>
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8 #include "dynload.h"
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9
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10 /** ---------------------------------------------------------------------------
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11 ** C-Function: r_dynload
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12 ** Description: load shared library and return lib handle
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13 ** R-Calling Convention: .Call
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14 **
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15 **/
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16
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17 SEXP r_dynload(SEXP libpath_x)
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18 {
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19 const char* libpath_S;
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20 void* libHandle;
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21
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22 libpath_S = CHAR(STRING_ELT(libpath_x,0));
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23 libHandle = dlLoadLibrary(libpath_S);
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24
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25 if (!libHandle)
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26 return R_NilValue;
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27
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28 return R_MakeExternalPtr(libHandle, R_NilValue, R_NilValue);
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29 }
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30
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31 /** ---------------------------------------------------------------------------
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32 ** C-Function: r_dynunload
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33 ** Description: unload shared library
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34 ** R-Calling Convention: .Call
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35 **
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36 **/
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37
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38 SEXP r_dynunload(SEXP libobj_x)
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39 {
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40 void* libHandle;
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41
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42 if (TYPEOF(libobj_x) != EXTPTRSXP) error("first argument is not of type external ptr.");
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43
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44 libHandle = R_ExternalPtrAddr(libobj_x);
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45
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46 if (!libHandle) error("not a lib handle");
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47
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48 dlFreeLibrary( libHandle );
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49
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50 return R_NilValue;
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51 }
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52
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53 /** ---------------------------------------------------------------------------
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54 ** C-Function: r_dynsym
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55 ** Description: resolve symbol
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56 ** R-Calling Convention: .Call
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57 **
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58 **/
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59
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60 SEXP r_dynsym(SEXP libh, SEXP symname_x, SEXP protectlib)
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61 {
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62 void* libHandle;
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63 const char* symbol;
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64 void* addr;
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65 SEXP protect;
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66 libHandle = R_ExternalPtrAddr(libh);
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67 symbol = CHAR(STRING_ELT(symname_x,0) );
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68 addr = dlFindSymbol( libHandle, symbol );
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69 protect = (LOGICAL(protectlib)[0]) ? libh : R_NilValue;
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70 return (addr) ? R_MakeExternalPtr(addr, R_NilValue, protect) : R_NilValue;
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71 }
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