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* BinReloc - a library for creating relocatable executables
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* Written by: Mike Hearn <mike@theoretic.com>
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* Hongli Lai <h.lai@chello.nl>
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* http://autopackage.org/
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* This source code is public domain. You can relicense this code
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* under whatever license you want.
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* NOTE: if you're using C++ and are getting "undefined reference
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* to br_*", try renaming prefix.c to prefix.cpp
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/* WARNING, BEFORE YOU MODIFY PREFIX.C:
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* If you make changes to any of the functions in prefix.c, you MUST
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* change the BR_NAMESPACE macro (in prefix.h).
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* This way you can avoid symbol table conflicts with other libraries
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* that also happen to use BinReloc.
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* #define BR_NAMESPACE(funcName) foobar_ ## funcName
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* --> expands br_locate to foobar_br_locate
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/* Change 1 to 0 if you don't want pthread support */
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#endif /* BR_PTHREADS */
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#endif /* __cplusplus */
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#define NULL ((void *) 0)
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#define br_return_val_if_fail(expr,val) if (!(expr)) {fprintf (stderr, "** BinReloc (%s): assertion %s failed\n", __PRETTY_FUNCTION__, #expr); return val;}
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#define br_return_val_if_fail(expr,val) if (!(expr)) return val
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static br_locate_fallback_func fallback_func = (br_locate_fallback_func) NULL;
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static void *fallback_data = NULL;
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#ifdef ENABLE_BINRELOC
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#include <sys/types.h>
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#include <sys/param.h>
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* symbol: A symbol that belongs to the app/library you want to locate.
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* Returns: A newly allocated string containing the full path of the
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* app/library that func belongs to, or NULL on error. This
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* string should be freed when not when no longer needed.
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* Finds out to which application or library symbol belongs, then locate
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* the full path of that application or library.
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* Note that symbol cannot be a pointer to a function. That will not work.
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* int main (int argc, char *argv[]) {
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* printf ("Full path of this app: %s\n", br_locate (&argc));
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* --> libfoo.c starts here
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* void libfoo_start () {
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* --> "" is a symbol that belongs to libfoo (because it's called
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* --> from libfoo_start()); that's why this works.
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* printf ("libfoo is located in: %s\n", br_locate (""));
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br_locate (void *symbol)
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br_return_val_if_fail (symbol != NULL, NULL);
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f = fopen ("/proc/self/maps", "r");
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return fallback_func(symbol, fallback_data);
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unsigned long start, end;
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if (!fgets (line, sizeof (line), f))
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if (!strstr (line, " r-xp ") || !strchr (line, '/'))
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sscanf (line, "%lx-%lx ", &start, &end);
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if (symbol >= (void *) start && symbol < (void *) end)
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/* Extract the filename; it is always an absolute path */
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path = strchr (line, '/');
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/* Get rid of the newline */
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tmp = strrchr (path, '\n');
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/* Get rid of "(deleted)" */
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if (len > 10 && strcmp (path + len - 10, " (deleted)") == 0)
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tmp = path + len - 10;
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return strdup (path);
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* symbol: A symbol that belongs to the app/library you want to locate.
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* Returns: A prefix. This string should be freed when no longer needed.
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* Locates the full path of the app/library that symbol belongs to, and return
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* the prefix of that path, or NULL on error.
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* Note that symbol cannot be a pointer to a function. That will not work.
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* --> This application is located in /usr/bin/foo
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* br_locate_prefix (&argc); --> returns: "/usr"
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br_locate_prefix (void *symbol)
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br_return_val_if_fail (symbol != NULL, NULL);
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path = br_locate (symbol);
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if (!path) return NULL;
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prefix = br_extract_prefix (path);
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* symbol: A symbol that belongs to the app/library you want to locate.
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* path: The path that you want to prepend the prefix to.
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* Returns: The new path, or NULL on error. This string should be freed when no
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* Gets the prefix of the app/library that symbol belongs to. Prepend that prefix to path.
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* Note that symbol cannot be a pointer to a function. That will not work.
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* --> The application is /usr/bin/foo
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* br_prepend_prefix (&argc, "/share/foo/data.png"); --> Returns "/usr/share/foo/data.png"
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br_prepend_prefix (void *symbol, char *path)
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br_return_val_if_fail (symbol != NULL, NULL);
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br_return_val_if_fail (path != NULL, NULL);
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tmp = br_locate_prefix (symbol);
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if (!tmp) return NULL;
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if (strcmp (tmp, "/") == 0)
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newpath = strdup (path);
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newpath = br_strcat (tmp, path);
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/* Get rid of compiler warning ("br_prepend_prefix never used") */
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if (0) br_prepend_prefix (NULL, NULL);
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#endif /* ENABLE_BINRELOC */
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/* Pthread stuff for thread safetiness */
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#if BR_PTHREADS && defined(ENABLE_BINRELOC)
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static pthread_key_t br_thread_key;
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static pthread_once_t br_thread_key_once = PTHREAD_ONCE_INIT;
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br_thread_local_store_fini ()
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specific = (char *) pthread_getspecific (br_thread_key);
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pthread_setspecific (br_thread_key, NULL);
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pthread_key_delete (br_thread_key);
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br_str_free (void *str)
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br_thread_local_store_init ()
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if (pthread_key_create (&br_thread_key, br_str_free) == 0)
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atexit (br_thread_local_store_fini);
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#else /* BR_PTHREADS */
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#ifdef ENABLE_BINRELOC
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static char *br_last_value = (char *) NULL;
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br_free_last_value ()
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free (br_last_value);
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#endif /* ENABLE_BINRELOC */
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#endif /* BR_PTHREADS */
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#ifdef ENABLE_BINRELOC
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* br_thread_local_store:
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* str: A dynamically allocated string.
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* Returns: str. This return value must not be freed.
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* Store str in a thread-local variable and return str. The next
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* you run this function, that variable is freed too.
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* This function is created so you don't have to worry about freeing
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* strings. Just be careful about doing this sort of thing:
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* some_function( BR_DATADIR("/one.png"), BR_DATADIR("/two.png") )
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* foo = br_thread_local_store (strdup ("hello")); --> foo == "hello"
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* foo = br_thread_local_store (strdup ("world")); --> foo == "world"; "hello" is now freed.
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br_thread_local_store (char *str)
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pthread_once (&br_thread_key_once, br_thread_local_store_init);
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specific = (char *) pthread_getspecific (br_thread_key);
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br_str_free (specific);
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pthread_setspecific (br_thread_key, str);
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#else /* BR_PTHREADS */
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static int initialized = 0;
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atexit (br_free_last_value);
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free (br_last_value);
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#endif /* BR_PTHREADS */
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return (const char *) str;
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#endif /* ENABLE_BINRELOC */
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* str2: Another string.
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* Returns: A newly-allocated string. This string should be freed when no longer needed.
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* Concatenate str1 and str2 to a newly allocated string.
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br_strcat (const char *str1, const char *str2)
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if (!str1) str1 = "";
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if (!str2) str2 = "";
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len1 = strlen (str1);
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len2 = strlen (str2);
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result = (char *) malloc (len1 + len2 + 1);
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memcpy (result, str1, len1);
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memcpy (result + len1, str2, len2);
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result[len1 + len2] = '\0';
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/* Emulates glibc's strndup() */
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br_strndup (char *str, size_t size)
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char *result = (char *) NULL;
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br_return_val_if_fail (str != (char *) NULL, (char *) NULL);
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if (!len) return strdup ("");
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if (size > len) size = len;
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result = (char *) calloc (sizeof (char), len + 1);
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memcpy (result, str, size);
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* Returns: A directory name. This string should be freed when no longer needed.
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* Extracts the directory component of path. Similar to g_dirname() or the dirname
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* commandline application.
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* br_extract_dir ("/usr/local/foobar"); --> Returns: "/usr/local"
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br_extract_dir (const char *path)
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br_return_val_if_fail (path != (char *) NULL, (char *) NULL);
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end = strrchr (path, '/');
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if (!end) return strdup (".");
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while (end > path && *end == '/')
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result = br_strndup ((char *) path, end - path + 1);
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* path: The full path of an executable or library.
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* Returns: The prefix, or NULL on error. This string should be freed when no longer needed.
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* Extracts the prefix from path. This function assumes that your executable
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* or library is installed in an LSB-compatible directory structure.
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* br_extract_prefix ("/usr/bin/gnome-panel"); --> Returns "/usr"
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* br_extract_prefix ("/usr/local/lib/libfoo.so"); --> Returns "/usr/local"
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* br_extract_prefix ("/usr/local/libfoo.so"); --> Returns "/usr"
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br_extract_prefix (const char *path)
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char *end, *tmp, *result;
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br_return_val_if_fail (path != (char *) NULL, (char *) NULL);
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if (!*path) return strdup ("/");
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end = strrchr (path, '/');
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if (!end) return strdup (path);
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tmp = br_strndup ((char *) path, end - path);
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end = strrchr (tmp, '/');
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if (!end) return tmp;
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result = br_strndup (tmp, end - tmp);
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result = strdup ("/");
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* br_set_fallback_function:
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* func: A function to call to find the binary.
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* data: User data to pass to func.
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* Sets a function to call to find the path to the binary, in
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* case "/proc/self/maps" can't be opened. The function set should
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* return a string that is safe to free with free().
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br_set_locate_fallback_func (br_locate_fallback_func func, void *data)
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fallback_func = func;
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fallback_data = data;
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#endif /* __cplusplus */
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#endif /* _PREFIX_C */
added
removed
src/thirdparty/binreloc/prefix.c
