--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/os/bsd/libproc_impl.c	Sun Sep 25 16:03:29 2011 -0700
@@ -0,0 +1,452 @@
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <thread_db.h>
+#include "libproc_impl.h"
+
+static const char* alt_root = NULL;
+static int alt_root_len = -1;
+
+#define SA_ALTROOT "SA_ALTROOT"
+
+static void init_alt_root() {
+   if (alt_root_len == -1) {
+      alt_root = getenv(SA_ALTROOT);
+      if (alt_root) {
+         alt_root_len = strlen(alt_root);
+      } else {
+         alt_root_len = 0;
+      }
+   }
+}
+
+int pathmap_open(const char* name) {
+   int fd;
+   char alt_path[PATH_MAX + 1];
+
+   init_alt_root();
+   fd = open(name, O_RDONLY);
+   if (fd >= 0) {
+      return fd;
+   }
+
+   if (alt_root_len > 0) {
+      strcpy(alt_path, alt_root);
+      strcat(alt_path, name);
+      fd = open(alt_path, O_RDONLY);
+      if (fd >= 0) {
+         print_debug("path %s substituted for %s\n", alt_path, name);
+         return fd;
+      }
+
+      if (strrchr(name, '/')) {
+         strcpy(alt_path, alt_root);
+         strcat(alt_path, strrchr(name, '/'));
+         fd = open(alt_path, O_RDONLY);
+         if (fd >= 0) {
+            print_debug("path %s substituted for %s\n", alt_path, name);
+            return fd;
+         }
+      }
+   }
+
+   return -1;
+}
+
+static bool _libsaproc_debug;
+
+void print_debug(const char* format,...) {
+   if (_libsaproc_debug) {
+     va_list alist;
+
+     va_start(alist, format);
+     fputs("libsaproc DEBUG: ", stderr);
+     vfprintf(stderr, format, alist);
+     va_end(alist);
+   }
+}
+
+bool is_debug() {
+   return _libsaproc_debug;
+}
+
+// initialize libproc
+bool init_libproc(bool debug) {
+   // init debug mode
+   _libsaproc_debug = debug;
+
+   // initialize the thread_db library
+   if (td_init() != TD_OK) {
+     print_debug("libthread_db's td_init failed\n");
+     return false;
+   }
+
+   return true;
+}
+
+static void destroy_lib_info(struct ps_prochandle* ph) {
+   lib_info* lib = ph->libs;
+   while (lib) {
+     lib_info *next = lib->next;
+     if (lib->symtab) {
+        destroy_symtab(lib->symtab);
+     }
+     free(lib);
+     lib = next;
+   }
+}
+
+static void destroy_thread_info(struct ps_prochandle* ph) {
+   thread_info* thr = ph->threads;
+   while (thr) {
+     thread_info *next = thr->next;
+     free(thr);
+     thr = next;
+   }
+}
+
+// ps_prochandle cleanup
+
+// ps_prochandle cleanup
+void Prelease(struct ps_prochandle* ph) {
+   // do the "derived class" clean-up first
+   ph->ops->release(ph);
+   destroy_lib_info(ph);
+   destroy_thread_info(ph);
+   free(ph);
+}
+
+lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) {
+   return add_lib_info_fd(ph, libname, -1, base);
+}
+
+lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) {
+   lib_info* newlib;
+
+   if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) {
+      print_debug("can't allocate memory for lib_info\n");
+      return NULL;
+   }
+
+   strncpy(newlib->name, libname, sizeof(newlib->name));
+   newlib->base = base;
+
+   if (fd == -1) {
+      if ( (newlib->fd = pathmap_open(newlib->name)) < 0) {
+         print_debug("can't open shared object %s\n", newlib->name);
+         free(newlib);
+         return NULL;
+      }
+   } else {
+      newlib->fd = fd;
+   }
+
+   // check whether we have got an ELF file. /proc/<pid>/map
+   // gives out all file mappings and not just shared objects
+   if (is_elf_file(newlib->fd) == false) {
+      close(newlib->fd);
+      free(newlib);
+      return NULL;
+   }
+
+   newlib->symtab = build_symtab(newlib->fd);
+   if (newlib->symtab == NULL) {
+      print_debug("symbol table build failed for %s\n", newlib->name);
+   }
+   else {
+      print_debug("built symbol table for %s\n", newlib->name);
+   }
+
+   // even if symbol table building fails, we add the lib_info.
+   // This is because we may need to read from the ELF file for core file
+   // address read functionality. lookup_symbol checks for NULL symtab.
+   if (ph->libs) {
+      ph->lib_tail->next = newlib;
+      ph->lib_tail = newlib;
+   }  else {
+      ph->libs = ph->lib_tail = newlib;
+   }
+   ph->num_libs++;
+
+   return newlib;
+}
+
+// lookup for a specific symbol
+uintptr_t lookup_symbol(struct ps_prochandle* ph,  const char* object_name,
+                       const char* sym_name) {
+   // ignore object_name. search in all libraries
+   // FIXME: what should we do with object_name?? The library names are obtained
+   // by parsing /proc/<pid>/maps, which may not be the same as object_name.
+   // What we need is a utility to map object_name to real file name, something
+   // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For
+   // now, we just ignore object_name and do a global search for the symbol.
+
+   lib_info* lib = ph->libs;
+   while (lib) {
+      if (lib->symtab) {
+         uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL);
+         if (res) return res;
+      }
+      lib = lib->next;
+   }
+
+   print_debug("lookup failed for symbol '%s' in obj '%s'\n",
+                          sym_name, object_name);
+   return (uintptr_t) NULL;
+}
+
+
+const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) {
+   const char* res = NULL;
+   lib_info* lib = ph->libs;
+   while (lib) {
+      if (lib->symtab && addr >= lib->base) {
+         res = nearest_symbol(lib->symtab, addr - lib->base, poffset);
+         if (res) return res;
+      }
+      lib = lib->next;
+   }
+   return NULL;
+}
+
+// add a thread to ps_prochandle
+thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) {
+   thread_info* newthr;
+   if ( (newthr = (thread_info*) calloc(1, sizeof(thread_info))) == NULL) {
+      print_debug("can't allocate memory for thread_info\n");
+      return NULL;
+   }
+
+   // initialize thread info
+   newthr->pthread_id = pthread_id;
+   newthr->lwp_id = lwp_id;
+
+   // add new thread to the list
+   newthr->next = ph->threads;
+   ph->threads = newthr;
+   ph->num_threads++;
+   return newthr;
+}
+
+
+// struct used for client data from thread_db callback
+struct thread_db_client_data {
+   struct ps_prochandle* ph;
+   thread_info_callback callback;
+};
+
+// callback function for libthread_db
+static int thread_db_callback(const td_thrhandle_t *th_p, void *data) {
+  struct thread_db_client_data* ptr = (struct thread_db_client_data*) data;
+  td_thrinfo_t ti;
+  td_err_e err;
+
+  memset(&ti, 0, sizeof(ti));
+  err = td_thr_get_info(th_p, &ti);
+  if (err != TD_OK) {
+    print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n");
+    return err;
+  }
+
+  print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid);
+
+  if (ptr->callback(ptr->ph, (pthread_t)ti.ti_tid, ti.ti_lid) != true)
+    return TD_ERR;
+
+  return TD_OK;
+}
+
+// read thread_info using libthread_db
+bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) {
+  struct thread_db_client_data mydata;
+  td_thragent_t* thread_agent = NULL;
+  if (td_ta_new(ph, &thread_agent) != TD_OK) {
+     print_debug("can't create libthread_db agent\n");
+     return false;
+  }
+
+  mydata.ph = ph;
+  mydata.callback = cb;
+
+  // we use libthread_db iterator to iterate thru list of threads.
+  if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata,
+                 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
+                 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) {
+     td_ta_delete(thread_agent);
+     return false;
+  }
+
+  // delete thread agent
+  td_ta_delete(thread_agent);
+  return true;
+}
+
+
+// get number of threads
+int get_num_threads(struct ps_prochandle* ph) {
+   return ph->num_threads;
+}
+
+// get lwp_id of n'th thread
+lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) {
+   int count = 0;
+   thread_info* thr = ph->threads;
+   while (thr) {
+      if (count == index) {
+         return thr->lwp_id;
+      }
+      count++;
+      thr = thr->next;
+   }
+   return -1;
+}
+
+// get regs for a given lwp
+bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct reg* regs) {
+  return ph->ops->get_lwp_regs(ph, lwp_id, regs);
+}
+
+// get number of shared objects
+int get_num_libs(struct ps_prochandle* ph) {
+   return ph->num_libs;
+}
+
+// get name of n'th solib
+const char* get_lib_name(struct ps_prochandle* ph, int index) {
+   int count = 0;
+   lib_info* lib = ph->libs;
+   while (lib) {
+      if (count == index) {
+         return lib->name;
+      }
+      count++;
+      lib = lib->next;
+   }
+   return NULL;
+}
+
+// get base address of a lib
+uintptr_t get_lib_base(struct ps_prochandle* ph, int index) {
+   int count = 0;
+   lib_info* lib = ph->libs;
+   while (lib) {
+      if (count == index) {
+         return lib->base;
+      }
+      count++;
+      lib = lib->next;
+   }
+   return (uintptr_t)NULL;
+}
+
+bool find_lib(struct ps_prochandle* ph, const char *lib_name) {
+  lib_info *p = ph->libs;
+  while (p) {
+    if (strcmp(p->name, lib_name) == 0) {
+      return true;
+    }
+    p = p->next;
+  }
+  return false;
+}
+
+//--------------------------------------------------------------------------
+// proc service functions
+
+// ps_pglobal_lookup() looks up the symbol sym_name in the symbol table
+// of the load object object_name in the target process identified by ph.
+// It returns the symbol's value as an address in the target process in
+// *sym_addr.
+
+ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name,
+                    const char *sym_name, psaddr_t *sym_addr) {
+  *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name);
+  return (*sym_addr ? PS_OK : PS_NOSYM);
+}
+
+// read "size" bytes info "buf" from address "addr"
+ps_err_e ps_pread(struct ps_prochandle *ph, psaddr_t  addr,
+                  void *buf, size_t size) {
+  return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR;
+}
+
+// write "size" bytes of data to debuggee at address "addr"
+ps_err_e ps_pwrite(struct ps_prochandle *ph, psaddr_t addr,
+                   const void *buf, size_t size) {
+  return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR;
+}
+
+// fill in ptrace_lwpinfo for lid
+ps_err_e ps_linfo(struct ps_prochandle *ph, lwpid_t lwp_id, void *linfo) {
+  return ph->ops->get_lwp_info(ph, lwp_id, linfo)? PS_OK: PS_ERR;
+}
+
+// needed for when libthread_db is compiled with TD_DEBUG defined
+void
+ps_plog (const char *format, ...)
+{
+  va_list alist;
+
+  va_start(alist, format);
+  vfprintf(stderr, format, alist);
+  va_end(alist);
+}
+
+// ------------------------------------------------------------------------
+// Functions below this point are not yet implemented. They are here only
+// to make the linker happy.
+
+ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) {
+  print_debug("ps_lsetfpregs not implemented\n");
+  return PS_OK;
+}
+
+ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) {
+  print_debug("ps_lsetregs not implemented\n");
+  return PS_OK;
+}
+
+ps_err_e  ps_lgetfpregs(struct  ps_prochandle  *ph,  lwpid_t lid, prfpregset_t *fpregs) {
+  print_debug("ps_lgetfpregs not implemented\n");
+  return PS_OK;
+}
+
+ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) {
+  print_debug("ps_lgetfpregs not implemented\n");
+  return PS_OK;
+}
+
+ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lid) {
+  print_debug("ps_lstop not implemented\n");
+  return PS_OK;
+}
+
+ps_err_e ps_pcontinue(struct ps_prochandle *ph) {
+  print_debug("ps_pcontinue not implemented\n");
+  return PS_OK;
+}