diff --git a/dlfcn.c b/dlfcn.c
new file mode 100755
index 0000000000000000000000000000000000000000..60244968e46787f427a498ef3f97af615ad75c8c
--- /dev/null
+++ b/dlfcn.c
@@ -0,0 +1,1313 @@
+/*
+Copyright (c) 2002 Jorge Acereda <jacereda@users.sourceforge.net> &
+ Peter O'Gorman <ogorman@users.sourceforge.net>
+
+Portions may be copyright others, see the AUTHORS file included with this
+distribution.
+
+Maintained by Peter O'Gorman <ogorman@users.sourceforge.net>
+
+Bug Reports and other queries should go to <ogorman@users.sourceforge.net>
+
+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, sublicense, 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 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
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 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.
+*/
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdarg.h>
+#include <limits.h>
+#include <mach-o/dyld.h>
+#include <mach-o/nlist.h>
+#include <mach-o/getsect.h>
+/* Just playing to see if it would compile with the freebsd headers, it does,
+ * but because of the different values for RTLD_LOCAL etc, it would break binary
+ * compat... oh well
+ */
+#ifndef __BSD_VISIBLE
+#define __BSD_VISIBLE 1
+#endif
+#include <asterisk/dlfcn-compat.h>
+
+#ifndef dl_restrict
+#define dl_restrict __restrict
+#endif
+/* This is not available on 10.1 */
+#ifndef LC_LOAD_WEAK_DYLIB
+#define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)
+#endif
+
+/* With this stuff here, this thing may actually compile/run on 10.0 systems
+ * Not that I have a 10.0 system to test it on anylonger
+ */
+#ifndef LC_REQ_DYLD
+#define LC_REQ_DYLD 0x80000000
+#endif
+#ifndef NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
+#define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED 0x4
+#endif
+#ifndef NSADDIMAGE_OPTION_RETURN_ON_ERROR
+#define NSADDIMAGE_OPTION_RETURN_ON_ERROR 0x1
+#endif
+#ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND
+#define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND 0x0
+#endif
+#ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
+#define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR 0x4
+#endif
+/* These symbols will be looked for in dyld */
+static const struct mach_header *(*dyld_NSAddImage) (const char *, unsigned long) = 0;
+static int (*dyld_NSIsSymbolNameDefinedInImage) (const struct mach_header *, const char *) = 0;
+static NSSymbol(*dyld_NSLookupSymbolInImage)
+ (const struct mach_header *, const char *, unsigned long) = 0;
+
+/* Define this to make dlcompat reuse data block. This way in theory we save
+ * a little bit of overhead. However we then couldn't correctly catch excess
+ * calls to dlclose(). Hence we don't use this feature
+ */
+#undef REUSE_STATUS
+
+/* Size of the internal error message buffer (used by dlerror()) */
+#define ERR_STR_LEN 251
+
+/* Maximum number of search paths supported by getSearchPath */
+#define MAX_SEARCH_PATHS 32
+
+
+#define MAGIC_DYLIB_OFI ((NSObjectFileImage) 'DYOF')
+#define MAGIC_DYLIB_MOD ((NSModule) 'DYMO')
+
+/* internal flags */
+#define DL_IN_LIST 0x01
+
+/* our mutex */
+static pthread_mutex_t dlcompat_mutex;
+/* Our thread specific storage
+ */
+static pthread_key_t dlerror_key;
+
+struct dlthread
+{
+ int lockcnt;
+ unsigned char errset;
+ char errstr[ERR_STR_LEN];
+};
+
+/* This is our central data structure. Whenever a module is loaded via
+ * dlopen(), we create such a struct.
+ */
+struct dlstatus
+{
+ struct dlstatus *next; /* pointer to next element in the linked list */
+ NSModule module;
+ const struct mach_header *lib;
+ int refs; /* reference count */
+ int mode; /* mode in which this module was loaded */
+ dev_t device;
+ ino_t inode;
+ int flags; /* Any internal flags we may need */
+};
+
+/* Head node of the dlstatus list */
+static struct dlstatus mainStatus = { 0, MAGIC_DYLIB_MOD, NULL, -1, RTLD_GLOBAL, 0, 0, 0 };
+static struct dlstatus *stqueue = &mainStatus;
+
+
+/* Storage for the last error message (used by dlerror()) */
+/* static char err_str[ERR_STR_LEN]; */
+/* static int err_filled = 0; */
+
+/* Prototypes to internal functions */
+static void debug(const char *fmt, ...);
+static void error(const char *str, ...);
+static const char *safegetenv(const char *s);
+static const char *searchList(void);
+static const char *getSearchPath(int i);
+static const char *getFullPath(int i, const char *file);
+static const struct stat *findFile(const char *file, const char **fullPath);
+static int isValidStatus(struct dlstatus *status);
+static inline int isFlagSet(int mode, int flag);
+static struct dlstatus *lookupStatus(const struct stat *sbuf);
+static void insertStatus(struct dlstatus *dls, const struct stat *sbuf);
+static int promoteLocalToGlobal(struct dlstatus *dls);
+static void *reference(struct dlstatus *dls, int mode);
+static void *dlsymIntern(struct dlstatus *dls, const char *symbol, int canSetError);
+static struct dlstatus *allocStatus(void);
+static struct dlstatus *loadModule(const char *path, const struct stat *sbuf, int mode);
+static NSSymbol *search_linked_libs(const struct mach_header *mh, const char *symbol);
+static const char *get_lib_name(const struct mach_header *mh);
+static const struct mach_header *get_mach_header_from_NSModule(NSModule * mod);
+static void dlcompat_init_func(void);
+static inline void dolock(void);
+static inline void dounlock(void);
+static void dlerrorfree(void *data);
+static void resetdlerror(void);
+static const struct mach_header *my_find_image(const char *name);
+static const struct mach_header *image_for_address(const void *address);
+static void dlcompat_cleanup(void);
+static inline const char *dyld_error_str(void);
+
+#if FINK_BUILD
+/* Two Global Functions */
+void *dlsym_prepend_underscore(void *handle, const char *symbol);
+void *dlsym_auto_underscore(void *handle, const char *symbol);
+
+/* And their _intern counterparts */
+static void *dlsym_prepend_underscore_intern(void *handle, const char *symbol);
+static void *dlsym_auto_underscore_intern(void *handle, const char *symbol);
+#endif
+
+/* Functions */
+
+static void debug(const char *fmt, ...)
+{
+#if DEBUG > 1
+ va_list arg;
+ va_start(arg, fmt);
+ fprintf(stderr, "DLDEBUG: ");
+ vfprintf(stderr, fmt, arg);
+ fprintf(stderr, "\n");
+ fflush(stderr);
+ va_end(arg);
+#endif
+}
+
+static void error(const char *str, ...)
+{
+ va_list arg;
+ struct dlthread *tss;
+ char * err_str;
+ va_start(arg, str);
+ tss = pthread_getspecific(dlerror_key);
+ err_str = tss->errstr;
+ strncpy(err_str, "dlcompat: ", ERR_STR_LEN);
+ vsnprintf(err_str + 10, ERR_STR_LEN - 10, str, arg);
+ va_end(arg);
+ debug("ERROR: %s\n", err_str);
+ tss->errset = 1;
+}
+
+static void warning(const char *str)
+{
+#if DEBUG > 0
+ fprintf(stderr, "WARNING: dlcompat: %s\n", str);
+#endif
+}
+
+static const char *safegetenv(const char *s)
+{
+ const char *ss = getenv(s);
+ return ss ? ss : "";
+}
+
+/* because this is only used for debugging and error reporting functions, we
+ * don't really care about how elegant it is... it could use the load
+ * commands to find the install name of the library, but...
+ */
+static const char *get_lib_name(const struct mach_header *mh)
+{
+ unsigned long count = _dyld_image_count();
+ unsigned long i;
+ const char *val = NULL;
+ if (mh)
+ {
+ for (i = 0; i < count; i++)
+ {
+ if (mh == _dyld_get_image_header(i))
+ {
+ val = _dyld_get_image_name(i);
+ break;
+ }
+ }
+ }
+ return val;
+}
+
+/* Returns the mach_header for the module bu going through all the loaded images
+ * and finding the one with the same name as the module. There really ought to be
+ * an api for doing this, would be faster, but there isn't one right now
+ */
+static const struct mach_header *get_mach_header_from_NSModule(NSModule * mod)
+{
+ const char *mod_name = NSNameOfModule(mod);
+ struct mach_header *mh = NULL;
+ unsigned long count = _dyld_image_count();
+ unsigned long i;
+ debug("Module name: %s", mod_name);
+ for (i = 0; i < count; i++)
+ {
+ if (!strcmp(mod_name, _dyld_get_image_name(i)))
+ {
+ mh = _dyld_get_image_header(i);
+ break;
+ }
+ }
+ return mh;
+}
+
+
+/* Compute and return a list of all directories that we should search when
+ * trying to locate a module. We first look at the values of LD_LIBRARY_PATH
+ * and DYLD_LIBRARY_PATH, and then finally fall back to looking into
+ * /usr/lib and /lib. Since both of the environments variables can contain a
+ * list of colon seperated paths, we simply concat them and the two other paths
+ * into one big string, which we then can easily parse.
+ * Splitting this string into the actual path list is done by getSearchPath()
+ */
+static const char *searchList()
+{
+ size_t buf_size;
+ static char *buf=NULL;
+ const char *ldlp = safegetenv("LD_LIBRARY_PATH");
+ const char *dyldlp = safegetenv("DYLD_LIBRARY_PATH");
+ const char *stdpath = getenv("DYLD_FALLBACK_LIBRARY_PATH");
+ if (!stdpath)
+ stdpath = "/usr/local/lib:/lib:/usr/lib";
+ if (!buf)
+ {
+ buf_size = strlen(ldlp) + strlen(dyldlp) + strlen(stdpath) + 4;
+ buf = malloc(buf_size);
+ snprintf(buf, buf_size, "%s%s%s%s%s%c", dyldlp, (dyldlp[0] ? ":" : ""), ldlp, (ldlp[0] ? ":" : ""),
+ stdpath, '\0');
+ }
+ return buf;
+}
+
+/* Returns the ith search path from the list as computed by searchList() */
+static const char *getSearchPath(int i)
+{
+ static const char *list = 0;
+ static char **path = (char **)0;
+ static int end = 0;
+ static int numsize = MAX_SEARCH_PATHS;
+ static char **tmp;
+ /* So we can call free() in the "destructor" we use i=-1 to return the alloc'd array */
+ if (i == -1)
+ {
+ return (const char*)path;
+ }
+ if (!path)
+ {
+ path = (char **)calloc(MAX_SEARCH_PATHS, sizeof(char **));
+ }
+ if (!list && !end)
+ list = searchList();
+ if (i >= (numsize))
+ {
+ debug("Increasing size for long PATH");
+ tmp = (char **)calloc((MAX_SEARCH_PATHS + numsize), sizeof(char **));
+ if (tmp)
+ {
+ memcpy(tmp, path, sizeof(char **) * numsize);
+ free(path);
+ path = tmp;
+ numsize += MAX_SEARCH_PATHS;
+ }
+ else
+ {
+ return 0;
+ }
+ }
+
+ while (!path[i] && !end)
+ {
+ path[i] = strsep((char **)&list, ":");
+
+ if (path[i][0] == 0)
+ path[i] = 0;
+ end = (list == 0);
+ }
+ return path[i];
+}
+
+static const char *getFullPath(int i, const char *file)
+{
+ static char buf[PATH_MAX];
+ const char *path = getSearchPath(i);
+ if (path)
+ {
+ snprintf(buf, PATH_MAX, "%s/%s", path, file);
+ }
+ return path ? buf : 0;
+}
+
+/* Given a file name, try to determine the full path for that file. Starts
+ * its search in the current directory, and then tries all paths in the
+ * search list in the order they are specified there.
+ */
+static const struct stat *findFile(const char *file, const char **fullPath)
+{
+ int i = 0;
+ static struct stat sbuf;
+ char *fileName;
+ debug("finding file %s", file);
+ *fullPath = file;
+ if (0 == stat(file, &sbuf))
+ return &sbuf;
+ if (strchr(file, '/'))
+ return 0; /* If the path had a / we don't look in env var places */
+ fileName = NULL;
+ if (!fileName)
+ fileName = (char *)file;
+ while ((*fullPath = getFullPath(i++, fileName)))
+ {
+ if (0 == stat(*fullPath, &sbuf))
+ return &sbuf;
+ }
+ ;
+ return 0;
+}
+
+/* Determine whether a given dlstatus is valid or not */
+static int isValidStatus(struct dlstatus *status)
+{
+ /* Walk the list to verify status is contained in it */
+ struct dlstatus *dls = stqueue;
+ while (dls && status != dls)
+ dls = dls->next;
+ if (dls == 0)
+ error("invalid handle");
+ else if ((dls->module == 0) || (dls->refs == 0))
+ error("handle to closed library");
+ else
+ return TRUE;
+ return FALSE;
+}
+
+static inline int isFlagSet(int mode, int flag)
+{
+ return (mode & flag) == flag;
+}
+
+static struct dlstatus *lookupStatus(const struct stat *sbuf)
+{
+ struct dlstatus *dls = stqueue;
+ debug("looking for status");
+ while (dls && ( /* isFlagSet(dls->mode, RTLD_UNSHARED) */ 0
+ || sbuf->st_dev != dls->device || sbuf->st_ino != dls->inode))
+ dls = dls->next;
+ return dls;
+}
+
+static void insertStatus(struct dlstatus *dls, const struct stat *sbuf)
+{
+ debug("inserting status");
+ dls->inode = sbuf->st_ino;
+ dls->device = sbuf->st_dev;
+ dls->refs = 0;
+ dls->mode = 0;
+ if ((dls->flags & DL_IN_LIST) == 0)
+ {
+ dls->next = stqueue;
+ stqueue = dls;
+ dls->flags |= DL_IN_LIST;
+ }
+}
+
+static struct dlstatus *allocStatus()
+{
+ struct dlstatus *dls;
+#ifdef REUSE_STATUS
+ dls = stqueue;
+ while (dls && dls->module)
+ dls = dls->next;
+ if (!dls)
+#endif
+ dls = malloc(sizeof(*dls));
+ dls->flags = 0;
+ return dls;
+}
+
+static int promoteLocalToGlobal(struct dlstatus *dls)
+{
+ static int (*p) (NSModule module) = 0;
+ debug("promoting");
+ if (!p)
+ _dyld_func_lookup("__dyld_NSMakePrivateModulePublic", (unsigned long *)&p);
+ return (dls->module == MAGIC_DYLIB_MOD) || (p && p(dls->module));
+}
+
+static void *reference(struct dlstatus *dls, int mode)
+{
+ if (dls)
+ {
+ if (dls->module == MAGIC_DYLIB_MOD && !isFlagSet(mode, RTLD_GLOBAL))
+ {
+ warning("trying to open a .dylib with RTLD_LOCAL");
+ error("unable to open a .dylib with RTLD_LOCAL");
+ return NULL;
+ }
+ if (isFlagSet(mode, RTLD_GLOBAL) &&
+ !isFlagSet(dls->mode, RTLD_GLOBAL) && !promoteLocalToGlobal(dls))
+ {
+ error("unable to promote local module to global");
+ return NULL;
+ }
+ dls->mode |= mode;
+ dls->refs++;
+ }
+ else
+ debug("reference called with NULL argument");
+
+ return dls;
+}
+
+static const struct mach_header *my_find_image(const char *name)
+{
+ const struct mach_header *mh = 0;
+ const char *id = NULL;
+ int i = _dyld_image_count();
+ int j;
+ mh = (struct mach_header *)
+ dyld_NSAddImage(name, NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED |
+ NSADDIMAGE_OPTION_RETURN_ON_ERROR);
+ if (!mh)
+ {
+ for (j = 0; j < i; j++)
+ {
+ id = _dyld_get_image_name(j);
+ if (!strcmp(id, name))
+ {
+ mh = _dyld_get_image_header(j);
+ break;
+ }
+ }
+ }
+ return mh;
+}
+
+/*
+ * dyld adds libraries by first adding the directly dependant libraries in link order, and
+ * then adding the dependencies for those libraries, so we should do the same... but we don't
+ * bother adding the extra dependencies, if the symbols are neither in the loaded image nor
+ * any of it's direct dependencies, then it probably isn't there.
+ */
+NSSymbol *search_linked_libs(const struct mach_header * mh, const char *symbol)
+{
+ int n;
+ struct load_command *lc = 0;
+ struct mach_header *wh;
+ NSSymbol *nssym = 0;
+ if (dyld_NSAddImage && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage)
+ {
+ lc = (struct load_command *)((char *)mh + sizeof(struct mach_header));
+ for (n = 0; n < mh->ncmds; n++, lc = (struct load_command *)((char *)lc + lc->cmdsize))
+ {
+ if ((LC_LOAD_DYLIB == lc->cmd) || (LC_LOAD_WEAK_DYLIB == lc->cmd))
+ {
+ if ((wh = (struct mach_header *)
+ my_find_image((char *)(((struct dylib_command *)lc)->dylib.name.offset +
+ (char *)lc))))
+ {
+ if (dyld_NSIsSymbolNameDefinedInImage(wh, symbol))
+ {
+ nssym = dyld_NSLookupSymbolInImage(wh,
+ symbol,
+ NSLOOKUPSYMBOLINIMAGE_OPTION_BIND |
+ NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
+ break;
+ }
+ }
+ }
+ }
+ if ((!nssym) && NSIsSymbolNameDefined(symbol))
+ {
+ /* I've never seen this debug message...*/
+ debug("Symbol \"%s\" is defined but was not found", symbol);
+ }
+ }
+ return nssym;
+}
+
+/* Up to the caller to free() returned string */
+static inline const char *dyld_error_str()
+{
+ NSLinkEditErrors dylder;
+ int dylderno;
+ const char *dylderrstr;
+ const char *dyldfile;
+ const char* retStr = NULL;
+ NSLinkEditError(&dylder, &dylderno, &dyldfile, &dylderrstr);
+ if (dylderrstr && strlen(dylderrstr))
+ {
+ retStr = malloc(strlen(dylderrstr) +1);
+ strcpy((char*)retStr,dylderrstr);
+ }
+ return retStr;
+}
+
+static void *dlsymIntern(struct dlstatus *dls, const char *symbol, int canSetError)
+{
+ NSSymbol *nssym = 0;
+ void *caller = __builtin_return_address(1); /* Be *very* careful about inlining */
+ const struct mach_header *caller_mh = 0;
+ const char* savedErrorStr = NULL;
+ resetdlerror();
+#ifndef RTLD_SELF
+#define RTLD_SELF ((void *) -3)
+#endif
+ if (NULL == dls)
+ dls = RTLD_SELF;
+ if ((RTLD_NEXT == dls) || (RTLD_SELF == dls))
+ {
+ if (dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage)
+ {
+ caller_mh = image_for_address(caller);
+ if (RTLD_SELF == dls)
+ {
+ /* FIXME: We should be using the NSModule api, if SELF is an MH_BUNDLE
+ * But it appears to work anyway, and looking at the code in dyld_libfuncs.c
+ * this is acceptable.
+ */
+ if (dyld_NSIsSymbolNameDefinedInImage(caller_mh, symbol))
+ {
+ nssym = dyld_NSLookupSymbolInImage(caller_mh,
+ symbol,
+ NSLOOKUPSYMBOLINIMAGE_OPTION_BIND |
+ NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
+ }
+ }
+ if (!nssym)
+ {
+ if (RTLD_SELF == dls)
+ savedErrorStr = dyld_error_str();
+ nssym = search_linked_libs(caller_mh, symbol);
+ }
+ }
+ else
+ {
+ if (canSetError)
+ error("RTLD_SELF and RTLD_NEXT are not supported");
+ return NULL;
+ }
+ }
+ if (!nssym)
+ {
+
+ if (RTLD_DEFAULT == dls)
+ {
+ dls = &mainStatus;
+ }
+ if (!isValidStatus(dls))
+ return NULL;
+
+ if (dls->module != MAGIC_DYLIB_MOD)
+ {
+ nssym = NSLookupSymbolInModule(dls->module, symbol);
+ if (!nssym && NSIsSymbolNameDefined(symbol))
+ {
+ debug("Searching dependencies");
+ savedErrorStr = dyld_error_str();
+ nssym = search_linked_libs(get_mach_header_from_NSModule(dls->module), symbol);
+ }
+ }
+ else if (dls->lib && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage)
+ {
+ if (dyld_NSIsSymbolNameDefinedInImage(dls->lib, symbol))
+ {
+ nssym = dyld_NSLookupSymbolInImage(dls->lib,
+ symbol,
+ NSLOOKUPSYMBOLINIMAGE_OPTION_BIND |
+ NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
+ }
+ else if (NSIsSymbolNameDefined(symbol))
+ {
+ debug("Searching dependencies");
+ savedErrorStr = dyld_error_str();
+ nssym = search_linked_libs(dls->lib, symbol);
+ }
+ }
+ else if (dls->module == MAGIC_DYLIB_MOD)
+ {
+ /* Global context, use NSLookupAndBindSymbol */
+ if (NSIsSymbolNameDefined(symbol))
+ {
+ /* There doesn't seem to be a return on error option for this call???
+ this is potentially broken, if binding fails, it will improperly
+ exit the application. */
+ nssym = NSLookupAndBindSymbol(symbol);
+ }
+ else
+ {
+ if (savedErrorStr)
+ free((char*)savedErrorStr);
+ savedErrorStr = malloc(256);
+ snprintf((char*)savedErrorStr, 256, "Symbol \"%s\" not in global context",symbol);
+ }
+ }
+ }
+ /* Error reporting */
+ if (!nssym)
+ {
+ if (!savedErrorStr || !strlen(savedErrorStr))
+ {
+ if (savedErrorStr)
+ free((char*)savedErrorStr);
+ savedErrorStr = malloc(256);
+ snprintf((char*)savedErrorStr, 256,"Symbol \"%s\" not found",symbol);
+ }
+ if (canSetError)
+ {
+ error(savedErrorStr);
+ }
+ else
+ {
+ debug(savedErrorStr);
+ }
+ if (savedErrorStr)
+ free((char*)savedErrorStr);
+ return NULL;
+ }
+ return NSAddressOfSymbol(nssym);
+}
+
+static struct dlstatus *loadModule(const char *path, const struct stat *sbuf, int mode)
+{
+ NSObjectFileImage ofi = 0;
+ NSObjectFileImageReturnCode ofirc;
+ struct dlstatus *dls;
+ NSLinkEditErrors ler;
+ int lerno;
+ const char *errstr;
+ const char *file;
+ void (*init) (void);
+ ofirc = NSCreateObjectFileImageFromFile(path, &ofi);
+ switch (ofirc)
+ {
+ case NSObjectFileImageSuccess:
+ break;
+ case NSObjectFileImageInappropriateFile:
+ if (dyld_NSAddImage && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage)
+ {
+ if (!isFlagSet(mode, RTLD_GLOBAL))
+ {
+ warning("trying to open a .dylib with RTLD_LOCAL");
+ error("unable to open this file with RTLD_LOCAL");
+ return NULL;
+ }
+ }
+ else
+ {
+ error("opening this file is unsupported on this system");
+ return NULL;
+ }
+ break;
+ case NSObjectFileImageFailure:
+ error("object file setup failure");
+ return NULL;
+ case NSObjectFileImageArch:
+ error("no object for this architecture");
+ return NULL;
+ case NSObjectFileImageFormat:
+ error("bad object file format");
+ return NULL;
+ case NSObjectFileImageAccess:
+ error("can't read object file");
+ return NULL;
+ default:
+ error("unknown error from NSCreateObjectFileImageFromFile()");
+ return NULL;
+ }
+ dls = lookupStatus(sbuf);
+ if (!dls)
+ {
+ dls = allocStatus();
+ }
+ if (!dls)
+ {
+ error("unable to allocate memory");
+ return NULL;
+ }
+ dls->lib = 0;
+ if (ofirc == NSObjectFileImageInappropriateFile)
+ {
+ if ((dls->lib = dyld_NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR)))
+ {
+ debug("Dynamic lib loaded at %ld", dls->lib);
+ ofi = MAGIC_DYLIB_OFI;
+ dls->module = MAGIC_DYLIB_MOD;
+ ofirc = NSObjectFileImageSuccess;
+ /* Although it is possible with a bit of work to modify this so it works and
+ functions with RTLD_NOW, I don't deem it necessary at the moment */
+ }
+ if (!(dls->module))
+ {
+ NSLinkEditError(&ler, &lerno, &file, &errstr);
+ if (!errstr || (!strlen(errstr)))
+ error("Can't open this file type");
+ else
+ error(errstr);
+ if ((dls->flags & DL_IN_LIST) == 0)
+ {
+ free(dls);
+ }
+ return NULL;
+ }
+ }
+ else
+ {
+ dls->module = NSLinkModule(ofi, path,
+ NSLINKMODULE_OPTION_RETURN_ON_ERROR |
+ NSLINKMODULE_OPTION_PRIVATE |
+ (isFlagSet(mode, RTLD_NOW) ? NSLINKMODULE_OPTION_BINDNOW : 0));
+ NSDestroyObjectFileImage(ofi);
+ if (dls->module)
+ {
+ dls->lib = get_mach_header_from_NSModule(dls->module);
+ }
+ }
+ if (!dls->module)
+ {
+ NSLinkEditError(&ler, &lerno, &file, &errstr);
+ if ((dls->flags & DL_IN_LIST) == 0)
+ {
+ free(dls);
+ }
+ error(errstr);
+ return NULL;
+ }
+
+ insertStatus(dls, sbuf);
+ dls = reference(dls, mode);
+ if ((init = dlsymIntern(dls, "__init", 0)))
+ {
+ debug("calling _init()");
+ init();
+ }
+ return dls;
+}
+
+static void dlcompat_init_func(void)
+{
+ static int inited = 0;
+ if (!inited)
+ {
+ inited = 1;
+ _dyld_func_lookup("__dyld_NSAddImage", (unsigned long *)&dyld_NSAddImage);
+ _dyld_func_lookup("__dyld_NSIsSymbolNameDefinedInImage",
+ (unsigned long *)&dyld_NSIsSymbolNameDefinedInImage);
+ _dyld_func_lookup("__dyld_NSLookupSymbolInImage", (unsigned long *)&dyld_NSLookupSymbolInImage);
+ if (pthread_mutex_init(&dlcompat_mutex, NULL))
+ exit(1);
+ if (pthread_key_create(&dlerror_key, &dlerrorfree))
+ exit(1);
+ /* And be neat and tidy and clean up after ourselves */
+ atexit(dlcompat_cleanup);
+ }
+}
+
+#if 0
+#pragma CALL_ON_LOAD dlcompat_init_func
+#endif
+
+static void dlcompat_cleanup(void)
+{
+ struct dlstatus *dls;
+ struct dlstatus *next;
+ char *data;
+ data = (char *)searchList();
+ if ( data )
+ free( data );
+ data = (char *)getSearchPath(-1);
+ if ( data )
+ free( data );
+ pthread_mutex_destroy(&dlcompat_mutex);
+ pthread_key_delete(dlerror_key);
+ next = stqueue;
+ while (next && (next != &mainStatus))
+ {
+ dls = next;
+ next = dls->next;
+ free(dls);
+ }
+}
+
+static void resetdlerror()
+{
+ struct dlthread *tss;
+ tss = pthread_getspecific(dlerror_key);
+ tss->errset = 0;
+}
+
+static void dlerrorfree(void *data)
+{
+ free(data);
+}
+
+/* We kind of want a recursive lock here, but meet a little trouble
+ * because they are not available pre OS X 10.2, so we fake it
+ * using thread specific storage to keep a lock count
+ */
+static inline void dolock(void)
+{
+ int err = 0;
+ struct dlthread *tss;
+ tss = pthread_getspecific(dlerror_key);
+ if (!tss)
+ {
+ tss = malloc(sizeof(struct dlthread));
+ tss->lockcnt = 0;
+ tss->errset = 0;
+ if (pthread_setspecific(dlerror_key, tss))
+ {
+ fprintf(stderr,"dlcompat: pthread_setspecific failed\n");
+ exit(1);
+ }
+ }
+ if (!tss->lockcnt)
+ err = pthread_mutex_lock(&dlcompat_mutex);
+ tss->lockcnt = tss->lockcnt +1;
+ if (err)
+ exit(err);
+}
+
+static inline void dounlock(void)
+{
+ int err = 0;
+ struct dlthread *tss;
+ tss = pthread_getspecific(dlerror_key);
+ tss->lockcnt = tss->lockcnt -1;
+ if (!tss->lockcnt)
+ err = pthread_mutex_unlock(&dlcompat_mutex);
+ if (err)
+ exit(err);
+}
+
+void *dlopen(const char *path, int mode)
+{
+ const struct stat *sbuf;
+ struct dlstatus *dls;
+ const char *fullPath;
+ dlcompat_init_func(); /* Just in case */
+ dolock();
+ resetdlerror();
+ if (!path)
+ {
+ dls = &mainStatus;
+ goto dlopenok;
+ }
+ if (!(sbuf = findFile(path, &fullPath)))
+ {
+ error("file \"%s\" not found", path);
+ goto dlopenerror;
+ }
+ /* Now checks that it hasn't been closed already */
+ if ((dls = lookupStatus(sbuf)) && (dls->refs > 0))
+ {
+ /* debug("status found"); */
+ dls = reference(dls, mode);
+ goto dlopenok;
+ }
+#ifdef RTLD_NOLOAD
+ if (isFlagSet(mode, RTLD_NOLOAD))
+ {
+ error("no existing handle and RTLD_NOLOAD specified");
+ goto dlopenerror;
+ }
+#endif
+ if (isFlagSet(mode, RTLD_LAZY) && isFlagSet(mode, RTLD_NOW))
+ {
+ error("how can I load something both RTLD_LAZY and RTLD_NOW?");
+ goto dlopenerror;
+ }
+ dls = loadModule(fullPath, sbuf, mode);
+
+ dlopenok:
+ dounlock();
+ return (void *)dls;
+ dlopenerror:
+ dounlock();
+ return NULL;
+}
+
+#if !FINK_BUILD
+void *dlsym(void * dl_restrict handle, const char * dl_restrict symbol)
+{
+ int sym_len = strlen(symbol);
+ void *value = NULL;
+ char *malloc_sym = NULL;
+ dolock();
+ malloc_sym = malloc(sym_len + 2);
+ if (malloc_sym)
+ {
+ sprintf(malloc_sym, "_%s", symbol);
+ value = dlsymIntern(handle, malloc_sym, 1);
+ free(malloc_sym);
+ }
+ else
+ {
+ error("Unable to allocate memory");
+ goto dlsymerror;
+ }
+ dounlock();
+ return value;
+ dlsymerror:
+ dounlock();
+ return NULL;
+}
+#endif
+
+#if FINK_BUILD
+
+void *dlsym_prepend_underscore(void *handle, const char *symbol)
+{
+ void *answer;
+ dolock();
+ answer = dlsym_prepend_underscore_intern(handle, symbol);
+ dounlock();
+ return answer;
+}
+
+static void *dlsym_prepend_underscore_intern(void *handle, const char *symbol)
+{
+/*
+ * A quick and easy way for porting packages which call dlsym(handle,"sym")
+ * If the porter adds -Ddlsym=dlsym_prepend_underscore to the CFLAGS then
+ * this function will be called, and will add the required underscore.
+ *
+ * Note that I haven't figured out yet which should be "standard", prepend
+ * the underscore always, or not at all. These global functions need to go away
+ * for opendarwin.
+ */
+ int sym_len = strlen(symbol);
+ void *value = NULL;
+ char *malloc_sym = NULL;
+ malloc_sym = malloc(sym_len + 2);
+ if (malloc_sym)
+ {
+ sprintf(malloc_sym, "_%s", symbol);
+ value = dlsymIntern(handle, malloc_sym, 1);
+ free(malloc_sym);
+ }
+ else
+ {
+ error("Unable to allocate memory");
+ }
+ return value;
+}
+
+void *dlsym_auto_underscore(void *handle, const char *symbol)
+{
+ void *answer;
+ dolock();
+ answer = dlsym_auto_underscore_intern(handle, symbol);
+ dounlock();
+ return answer;
+
+}
+static void *dlsym_auto_underscore_intern(void *handle, const char *symbol)
+{
+ struct dlstatus *dls = handle;
+ void *addr = 0;
+ addr = dlsymIntern(dls, symbol, 0);
+ if (!addr)
+ addr = dlsym_prepend_underscore_intern(handle, symbol);
+ return addr;
+}
+
+
+void *dlsym(void * dl_restrict handle, const char * dl_restrict symbol)
+{
+ struct dlstatus *dls = handle;
+ void *addr = 0;
+ dolock();
+ addr = dlsymIntern(dls, symbol, 1);
+ dounlock();
+ return addr;
+}
+#endif
+
+int dlclose(void *handle)
+{
+ struct dlstatus *dls = handle;
+ dolock();
+ resetdlerror();
+ if (!isValidStatus(dls))
+ {
+ goto dlcloseerror;
+ }
+ if (dls->module == MAGIC_DYLIB_MOD)
+ {
+ const char *name;
+ if (!dls->lib)
+ {
+ name = "global context";
+ }
+ else
+ {
+ name = get_lib_name(dls->lib);
+ }
+ warning("trying to close a .dylib!");
+ error("Not closing \"%s\" - dynamic libraries cannot be closed", name);
+ goto dlcloseerror;
+ }
+ if (!dls->module)
+ {
+ error("module already closed");
+ goto dlcloseerror;
+ }
+
+ if (dls->refs == 1)
+ {
+ unsigned long options = 0;
+ void (*fini) (void);
+ if ((fini = dlsymIntern(dls, "__fini", 0)))
+ {
+ debug("calling _fini()");
+ fini();
+ }
+#ifdef __ppc__
+ options |= NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES;
+#endif
+#if 1
+/* Currently, if a module contains c++ static destructors and it is unloaded, we
+ * get a segfault in atexit(), due to compiler and dynamic loader differences of
+ * opinion, this works around that.
+ * I really need a way to figure out from code if this is still necessary.
+ */
+ if ((const struct section *)NULL !=
+ getsectbynamefromheader(get_mach_header_from_NSModule(dls->module),
+ "__DATA", "__mod_term_func"))
+ {
+ options |= NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED;
+ }
+#endif
+#ifdef RTLD_NODELETE
+ if (isFlagSet(dls->mode, RTLD_NODELETE))
+ options |= NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED;
+#endif
+ if (!NSUnLinkModule(dls->module, options))
+ {
+ error("unable to unlink module");
+ goto dlcloseerror;
+ }
+ dls->refs--;
+ dls->module = 0;
+ /* Note: the dlstatus struct dls is neither removed from the list
+ * nor is the memory it occupies freed. This shouldn't pose a
+ * problem in mostly all cases, though.
+ */
+ }
+ dounlock();
+ return 0;
+ dlcloseerror:
+ dounlock();
+ return 1;
+}
+
+const char *dlerror(void)
+{
+ struct dlthread *tss;
+ char * err_str;
+ tss = pthread_getspecific(dlerror_key);
+ err_str = tss->errstr;
+ tss = pthread_getspecific(dlerror_key);
+ if (tss->errset == 0)
+ return 0;
+ tss->errset = 0;
+ return (err_str );
+}
+
+/* Given an address, return the mach_header for the image containing it
+ * or zero if the given address is not contained in any loaded images.
+ */
+const struct mach_header *image_for_address(const void *address)
+{
+ unsigned long i;
+ unsigned long j;
+ unsigned long count = _dyld_image_count();
+ struct mach_header *mh = 0;
+ struct load_command *lc = 0;
+ unsigned long addr = NULL;
+ for (i = 0; i < count; i++)
+ {
+ addr = (unsigned long)address - _dyld_get_image_vmaddr_slide(i);
+ mh = _dyld_get_image_header(i);
+ if (mh)
+ {
+ lc = (struct load_command *)((char *)mh + sizeof(struct mach_header));
+ for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize))
+ {
+ if (LC_SEGMENT == lc->cmd &&
+ addr >= ((struct segment_command *)lc)->vmaddr &&
+ addr <
+ ((struct segment_command *)lc)->vmaddr + ((struct segment_command *)lc)->vmsize)
+ {
+ goto image_found;
+ }
+ }
+ }
+ mh = 0;
+ }
+ image_found:
+ return mh;
+}
+
+int dladdr(const void * dl_restrict p, Dl_info * dl_restrict info)
+{
+/*
+ FIXME: USe the routine image_for_address.
+*/
+ unsigned long i;
+ unsigned long j;
+ unsigned long count = _dyld_image_count();
+ struct mach_header *mh = 0;
+ struct load_command *lc = 0;
+ unsigned long addr = NULL;
+ unsigned long table_off = (unsigned long)0;
+ int found = 0;
+ if (!info)
+ return 0;
+ dolock();
+ resetdlerror();
+ info->dli_fname = 0;
+ info->dli_fbase = 0;
+ info->dli_sname = 0;
+ info->dli_saddr = 0;
+/* Some of this was swiped from code posted by Douglas Davidson <ddavidso AT apple DOT com>
+ * to darwin-development AT lists DOT apple DOT com and slightly modified
+ */
+ for (i = 0; i < count; i++)
+ {
+ addr = (unsigned long)p - _dyld_get_image_vmaddr_slide(i);
+ mh = _dyld_get_image_header(i);
+ if (mh)
+ {
+ lc = (struct load_command *)((char *)mh + sizeof(struct mach_header));
+ for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize))
+ {
+ if (LC_SEGMENT == lc->cmd &&
+ addr >= ((struct segment_command *)lc)->vmaddr &&
+ addr <
+ ((struct segment_command *)lc)->vmaddr + ((struct segment_command *)lc)->vmsize)
+ {
+ info->dli_fname = _dyld_get_image_name(i);
+ info->dli_fbase = (void *)mh;
+ found = 1;
+ break;
+ }
+ }
+ if (found)
+ break;
+ }
+ }
+ if (!found)
+ {
+ dounlock();
+ return 0;
+ }
+ lc = (struct load_command *)((char *)mh + sizeof(struct mach_header));
+ for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize))
+ {
+ if (LC_SEGMENT == lc->cmd)
+ {
+ if (!strcmp(((struct segment_command *)lc)->segname, "__LINKEDIT"))
+ break;
+ }
+ }
+ table_off =
+ ((unsigned long)((struct segment_command *)lc)->vmaddr) -
+ ((unsigned long)((struct segment_command *)lc)->fileoff) + _dyld_get_image_vmaddr_slide(i);
+ debug("table off %x", table_off);
+
+ lc = (struct load_command *)((char *)mh + sizeof(struct mach_header));
+ for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize))
+ {
+ if (LC_SYMTAB == lc->cmd)
+ {
+
+ struct nlist *symtable = (struct nlist *)(((struct symtab_command *)lc)->symoff + table_off);
+ unsigned long numsyms = ((struct symtab_command *)lc)->nsyms;
+ struct nlist *nearest = NULL;
+ unsigned long diff = 0xffffffff;
+ unsigned long strtable = (unsigned long)(((struct symtab_command *)lc)->stroff + table_off);
+ debug("symtable %x", symtable);
+ for (i = 0; i < numsyms; i++)
+ {
+ /* Ignore the following kinds of Symbols */
+ if ((!symtable->n_value) /* Undefined */
+ || (symtable->n_type >= N_PEXT) /* Debug symbol */
+ || (!(symtable->n_type & N_EXT)) /* Local Symbol */
+ )
+ {
+ symtable++;
+ continue;
+ }
+ if ((addr >= symtable->n_value) && (diff >= (symtable->n_value - addr)))
+ {
+ diff = (unsigned long)symtable->n_value - addr;
+ nearest = symtable;
+ }
+ symtable++;
+ }
+ if (nearest)
+ {
+ info->dli_saddr = nearest->n_value + ((void *)p - addr);
+ info->dli_sname = (char *)(strtable + nearest->n_un.n_strx);
+ }
+ }
+ }
+ dounlock();
+ return 1;
+}
+
+
+/*
+ * Implement the dlfunc() interface, which behaves exactly the same as
+ * dlsym() except that it returns a function pointer instead of a data
+ * pointer. This can be used by applications to avoid compiler warnings
+ * about undefined behavior, and is intended as prior art for future
+ * POSIX standardization. This function requires that all pointer types
+ * have the same representation, which is true on all platforms FreeBSD
+ * runs on, but is not guaranteed by the C standard.
+ */
+#if 0
+dlfunc_t dlfunc(void * dl_restrict handle, const char * dl_restrict symbol)
+{
+ union
+ {
+ void *d;
+ dlfunc_t f;
+ } rv;
+ int sym_len = strlen(symbol);
+ char *malloc_sym = NULL;
+ dolock();
+ malloc_sym = malloc(sym_len + 2);
+ if (malloc_sym)
+ {
+ sprintf(malloc_sym, "_%s", symbol);
+ rv.d = dlsymIntern(handle, malloc_sym, 1);
+ free(malloc_sym);
+ }
+ else
+ {
+ error("Unable to allocate memory");
+ goto dlfuncerror;
+ }
+ dounlock();
+ return rv.f;
+ dlfuncerror:
+ dounlock();
+ return NULL;
+}
+#endif
diff --git a/poll.c b/poll.c
new file mode 100755
index 0000000000000000000000000000000000000000..7a9d14e7a2e416eb3926048ec4c94c5aa3fa0a9f
--- /dev/null
+++ b/poll.c
@@ -0,0 +1,306 @@
+/*---------------------------------------------------------------------------*\
+ $Id$
+
+ NAME
+
+ poll - select(2)-based poll() emulation function for BSD systems.
+
+ SYNOPSIS
+ #include "poll.h"
+
+ struct pollfd
+ {
+ int fd;
+ short events;
+ short revents;
+ }
+
+ int poll (struct pollfd *pArray, unsigned long n_fds, int timeout)
+
+ DESCRIPTION
+
+ This file, and the accompanying "poll.h", implement the System V
+ poll(2) system call for BSD systems (which typically do not provide
+ poll()). Poll() provides a method for multiplexing input and output
+ on multiple open file descriptors; in traditional BSD systems, that
+ capability is provided by select(). While the semantics of select()
+ differ from those of poll(), poll() can be readily emulated in terms
+ of select() -- which is how this function is implemented.
+
+ REFERENCES
+ Stevens, W. Richard. Unix Network Programming. Prentice-Hall, 1990.
+
+ NOTES
+ 1. This software requires an ANSI C compiler.
+
+ LICENSE
+
+ This software is released under the following license:
+
+ Copyright (c) 1995-2002 Brian M. Clapper
+ All rights reserved.
+
+ Redistribution and use in source and binary forms are
+ permitted provided that: (1) source distributions retain
+ this entire copyright notice and comment; (2) modifications
+ made to the software are prominently mentioned, and a copy
+ of the original software (or a pointer to its location) are
+ included; and (3) distributions including binaries display
+ the following acknowledgement: "This product includes
+ software developed by Brian M. Clapper <bmc@clapper.org>"
+ in the documentation or other materials provided with the
+ distribution. The name of the author may not be used to
+ endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS
+ OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ PARTICULAR PURPOSE.
+
+ Effectively, this means you can do what you want with the software
+ except remove this notice or take advantage of the author's name.
+ If you modify the software and redistribute your modified version,
+ you must indicate that your version is a modification of the
+ original, and you must provide either a pointer to or a copy of the
+ original.
+\*---------------------------------------------------------------------------*/
+
+
+/*---------------------------------------------------------------------------*\
+ Includes
+\*---------------------------------------------------------------------------*/
+
+#include <unistd.h> /* standard Unix definitions */
+#include <sys/types.h> /* system types */
+#include <sys/time.h> /* time definitions */
+#include <assert.h> /* assertion macros */
+#include <string.h> /* string functions */
+
+#include <asterisk/poll-compat.h> /* this package */
+
+/*---------------------------------------------------------------------------*\
+ Macros
+\*---------------------------------------------------------------------------*/
+
+#ifndef MAX
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+#endif
+
+
+/*---------------------------------------------------------------------------*\
+ Private Functions
+\*---------------------------------------------------------------------------*/
+
+static int map_poll_spec
+#if __STDC__ > 0
+ (struct pollfd *pArray,
+ unsigned long n_fds,
+ fd_set *pReadSet,
+ fd_set *pWriteSet,
+ fd_set *pExceptSet)
+#else
+ (pArray, n_fds, pReadSet, pWriteSet, pExceptSet)
+ struct pollfd *pArray;
+ unsigned long n_fds;
+ fd_set *pReadSet;
+ fd_set *pWriteSet;
+ fd_set *pExceptSet;
+#endif
+{
+ register unsigned long i; /* loop control */
+ register struct pollfd *pCur; /* current array element */
+ register int max_fd = -1; /* return value */
+
+ /*
+ Map the poll() structures into the file descriptor sets required
+ by select().
+ */
+ for (i = 0, pCur = pArray; i < n_fds; i++, pCur++)
+ {
+ /* Skip any bad FDs in the array. */
+
+ if (pCur->fd < 0)
+ continue;
+
+ if (pCur->events & POLLIN)
+ {
+ /* "Input Ready" notification desired. */
+ FD_SET (pCur->fd, pReadSet);
+ }
+
+ if (pCur->events & POLLOUT)
+ {
+ /* "Output Possible" notification desired. */
+ FD_SET (pCur->fd, pWriteSet);
+ }
+
+ if (pCur->events & POLLPRI)
+ {
+ /*
+ "Exception Occurred" notification desired. (Exceptions
+ include out of band data.
+ */
+ FD_SET (pCur->fd, pExceptSet);
+ }
+
+ max_fd = MAX (max_fd, pCur->fd);
+ }
+
+ return max_fd;
+}
+
+static struct timeval *map_timeout
+#if __STDC__ > 0
+ (int poll_timeout, struct timeval *pSelTimeout)
+#else
+ (poll_timeout, pSelTimeout)
+ int poll_timeout;
+ struct timeval *pSelTimeout;
+#endif
+{
+ struct timeval *pResult;
+
+ /*
+ Map the poll() timeout value into a select() timeout. The possible
+ values of the poll() timeout value, and their meanings, are:
+
+ VALUE MEANING
+
+ -1 wait indefinitely (until signal occurs)
+ 0 return immediately, don't block
+ >0 wait specified number of milliseconds
+
+ select() uses a "struct timeval", which specifies the timeout in
+ seconds and microseconds, so the milliseconds value has to be mapped
+ accordingly.
+ */
+
+ assert (pSelTimeout != (struct timeval *) NULL);
+
+ switch (poll_timeout)
+ {
+ case -1:
+ /*
+ A NULL timeout structure tells select() to wait indefinitely.
+ */
+ pResult = (struct timeval *) NULL;
+ break;
+
+ case 0:
+ /*
+ "Return immediately" (test) is specified by all zeros in
+ a timeval structure.
+ */
+ pSelTimeout->tv_sec = 0;
+ pSelTimeout->tv_usec = 0;
+ pResult = pSelTimeout;
+ break;
+
+ default:
+ /* Wait the specified number of milliseconds. */
+ pSelTimeout->tv_sec = poll_timeout / 1000; /* get seconds */
+ poll_timeout %= 1000; /* remove seconds */
+ pSelTimeout->tv_usec = poll_timeout * 1000; /* get microseconds */
+ pResult = pSelTimeout;
+ break;
+ }
+
+
+ return pResult;
+}
+
+static void map_select_results
+#if __STDC__ > 0
+ (struct pollfd *pArray,
+ unsigned long n_fds,
+ fd_set *pReadSet,
+ fd_set *pWriteSet,
+ fd_set *pExceptSet)
+#else
+ (pArray, n_fds, pReadSet, pWriteSet, pExceptSet)
+ struct pollfd *pArray;
+ unsigned long n_fds;
+ fd_set *pReadSet;
+ fd_set *pWriteSet;
+ fd_set *pExceptSet;
+#endif
+{
+ register unsigned long i; /* loop control */
+ register struct pollfd *pCur; /* current array element */
+
+ for (i = 0, pCur = pArray; i < n_fds; i++, pCur++)
+ {
+ /* Skip any bad FDs in the array. */
+
+ if (pCur->fd < 0)
+ continue;
+
+ /* Exception events take priority over input events. */
+
+ pCur->revents = 0;
+ if (FD_ISSET (pCur->fd, pExceptSet))
+ pCur->revents |= POLLPRI;
+
+ else if (FD_ISSET (pCur->fd, pReadSet))
+ pCur->revents |= POLLIN;
+
+ if (FD_ISSET (pCur->fd, pWriteSet))
+ pCur->revents |= POLLOUT;
+ }
+
+ return;
+}
+
+/*---------------------------------------------------------------------------*\
+ Public Functions
+\*---------------------------------------------------------------------------*/
+
+int poll
+
+#if __STDC__ > 0
+ (struct pollfd *pArray, unsigned long n_fds, int timeout)
+#else
+ (pArray, n_fds, timeout)
+ struct pollfd *pArray;
+ unsigned long n_fds;
+ int timeout;
+#endif
+
+{
+ fd_set read_descs; /* input file descs */
+ fd_set write_descs; /* output file descs */
+ fd_set except_descs; /* exception descs */
+ struct timeval stime; /* select() timeout value */
+ int ready_descriptors; /* function result */
+ int max_fd; /* maximum fd value */
+ struct timeval *pTimeout; /* actually passed */
+
+ FD_ZERO (&read_descs);
+ FD_ZERO (&write_descs);
+ FD_ZERO (&except_descs);
+
+ assert (pArray != (struct pollfd *) NULL);
+
+ /* Map the poll() file descriptor list in the select() data structures. */
+
+ max_fd = map_poll_spec (pArray, n_fds,
+ &read_descs, &write_descs, &except_descs);
+
+ /* Map the poll() timeout value in the select() timeout structure. */
+
+ pTimeout = map_timeout (timeout, &stime);
+
+ /* Make the select() call. */
+
+ ready_descriptors = select (max_fd + 1, &read_descs, &write_descs,
+ &except_descs, pTimeout);
+
+ if (ready_descriptors >= 0)
+ {
+ map_select_results (pArray, n_fds,
+ &read_descs, &write_descs, &except_descs);
+ }
+
+ return ready_descriptors;
+}