diff options
| -rwxr-xr-x | src/Makefile.am | 2 | ||||
| -rw-r--r-- | src/dso_utils.c | 110 | ||||
| -rw-r--r-- | src/dso_utils.h | 74 |
3 files changed, 186 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index b8cc501..bae6e85 100755 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -47,6 +47,7 @@ driver_libs = \ $(NULL) source_c = \ + dso_utils.c \ gen6_mfc.c \ gen6_mfd.c \ gen6_vme.c \ @@ -73,6 +74,7 @@ source_c = \ $(NULL) source_h = \ + dso_utils.h \ gen6_mfc.h \ gen6_mfd.h \ gen6_vme.h \ diff --git a/src/dso_utils.c b/src/dso_utils.c new file mode 100644 index 0000000..8fdea11 --- /dev/null +++ b/src/dso_utils.c @@ -0,0 +1,110 @@ +/* + * Copyright (C) 2012 Intel Corporation. All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#define _GNU_SOURCE 1 +#include <stdio.h> +#include <stdlib.h> +#include <dlfcn.h> +#include "dso_utils.h" + +struct dso_handle { + void *handle; +}; + +/* Opens the named shared library */ +struct dso_handle * +dso_open(const char *path) +{ + struct dso_handle *h; + + h = calloc(1, sizeof(*h)); + if (!h) + return NULL; + + if (path) { + h->handle = dlopen(path, RTLD_LAZY|RTLD_LOCAL); + if (!h->handle) + goto error; + } + else + h->handle = RTLD_DEFAULT; + return h; + +error: + dso_close(h); + return NULL; +} + +/* Closes and disposed any allocated data */ +void +dso_close(struct dso_handle *h) +{ + if (!h) + return; + + if (h->handle) { + if (h->handle != RTLD_DEFAULT) + dlclose(h->handle); + h->handle = NULL; + } + free(h); +} + +/* Load symbol into the supplied location */ +static bool +get_symbol(struct dso_handle *h, void *func_vptr, const char *name) +{ + dso_generic_func func, * const func_ptr = func_vptr; + const char *error; + + dlerror(); + func = (dso_generic_func)dlsym(h->handle, name); + error = dlerror(); + if (error) { + fprintf(stderr, "error: failed to resolve %s(): %s\n", name, error); + return false; + } + *func_ptr = func; + return true; +} + +/* Loads symbols into the supplied vtable */ +bool +dso_get_symbols( + struct dso_handle *h, + void *vtable, + unsigned int vtable_length, + const struct dso_symbol *symbols +) +{ + const struct dso_symbol *s; + + for (s = symbols; s->name != NULL; s++) { + if (s->offset + sizeof(dso_generic_func) > vtable_length) + return false; + if (!get_symbol(h, ((char *)vtable) + s->offset, s->name)) + return false; + } + return true; +} diff --git a/src/dso_utils.h b/src/dso_utils.h new file mode 100644 index 0000000..9b8eba7 --- /dev/null +++ b/src/dso_utils.h @@ -0,0 +1,74 @@ +/* + * Copyright (C) 2012 Intel Corporation. All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#ifndef DSO_UTILS_H +#define DSO_UTILS_H + +#include <stdbool.h> + +/** Generic pointer to function. */ +typedef void (*dso_generic_func)(void); + +/** Library handle (opaque). */ +struct dso_handle; + +/** Symbol lookup table. */ +struct dso_symbol { + /** Symbol name */ + const char *name; + /** Offset into the supplied vtable where symbol is to be loaded. */ + unsigned int offset; +}; + +/** + * Opens the named shared library. + * + * @param[in] path the library name, or NULL to lookup into loaded libraries + * @return the newly allocated library handle + */ +struct dso_handle * +dso_open(const char *path); + +/** Closes and disposed any allocated data. */ +void +dso_close(struct dso_handle *h); + +/** + * Loads symbols into the supplied vtable. + * + * @param[in] handle the DSO handle + * @param[in] vtable the function table to fill in + * @param[in] vtable_length the size (in bytes) of the function table + * @param[in] symbols the NULL terminated array of symbols to lookup + * @return true on success, false otherwise + **/ +bool +dso_get_symbols( + struct dso_handle *h, + void *vtable, + unsigned int vtable_length, + const struct dso_symbol *symbols +); + +#endif /* DSO_UTILS_H */ |