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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #include "uv.h"
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23 #include "internal.h"
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24
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25 #include <dlfcn.h>
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26 #include <errno.h>
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27 #include <string.h>
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28 #include <locale.h>
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29
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30 static int uv__dlerror(uv_lib_t* lib);
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31
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32
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33 int uv_dlopen(const char* filename, uv_lib_t* lib) {
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34 dlerror(); /* Reset error status. */
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35 lib->errmsg = NULL;
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36 lib->handle = dlopen(filename, RTLD_LAZY);
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37 return lib->handle ? 0 : uv__dlerror(lib);
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38 }
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39
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40
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41 void uv_dlclose(uv_lib_t* lib) {
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42 uv__free(lib->errmsg);
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43 lib->errmsg = NULL;
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44
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45 if (lib->handle) {
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46 /* Ignore errors. No good way to signal them without leaking memory. */
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47 dlclose(lib->handle);
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48 lib->handle = NULL;
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49 }
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50 }
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51
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52
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53 int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
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54 dlerror(); /* Reset error status. */
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55 *ptr = dlsym(lib->handle, name);
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56 return *ptr ? 0 : uv__dlerror(lib);
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57 }
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58
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59
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60 const char* uv_dlerror(const uv_lib_t* lib) {
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61 return lib->errmsg ? lib->errmsg : "no error";
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62 }
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63
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64
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65 static int uv__dlerror(uv_lib_t* lib) {
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66 const char* errmsg;
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67
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68 uv__free(lib->errmsg);
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69
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70 errmsg = dlerror();
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71
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72 if (errmsg) {
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73 lib->errmsg = uv__strdup(errmsg);
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74 return -1;
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75 }
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76 else {
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77 lib->errmsg = NULL;
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78 return 0;
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79 }
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80 }
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