From 490bccd6596c496e9307fbc8639794f7fa2c165f Mon Sep 17 00:00:00 2001
From: Jim Ingham <jingham@apple.com>
Date: Thu, 1 Nov 2012 01:04:46 +0000
Subject: [PATCH] Switch from using KERN_PROCARGS2 to get the path to the
 executed process to proc_pidpath.  The former was flakey, and the whole point
 of libproc is to protect us from potential flakiness at that level...

<rdar://problem/12594781>

llvm-svn: 167194
---
 lldb/tools/debugserver/source/DNB.cpp | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/lldb/tools/debugserver/source/DNB.cpp b/lldb/tools/debugserver/source/DNB.cpp
index bb5e72c..401cefc 100644
--- a/lldb/tools/debugserver/source/DNB.cpp
+++ b/lldb/tools/debugserver/source/DNB.cpp
@@ -23,6 +23,7 @@
 #include <sys/sysctl.h>
 #include <map>
 #include <vector>
+#include <libproc.h>
 
 #include "MacOSX/MachProcess.h"
 #include "MacOSX/MachTask.h"
@@ -429,7 +430,6 @@ GetAllInfos (std::vector<struct kinfo_proc>& proc_infos)
     return proc_infos.size();
 }
 
-
 static size_t
 GetAllInfosMatchingName(const char *full_process_name, std::vector<struct kinfo_proc>& matching_proc_infos)
 {
@@ -460,24 +460,27 @@ GetAllInfosMatchingName(const char *full_process_name, std::vector<struct kinfo_
 
                 // Check for process by name. We only check the first MAXCOMLEN
                 // chars as that is all that kp_proc.p_comm holds.
+                
                 if (::strncasecmp(process_name, proc_infos[i].kp_proc.p_comm, MAXCOMLEN) == 0)
                 {
                     if (process_name_len > MAXCOMLEN)
                     {
                         // We found a matching process name whose first MAXCOMLEN
                         // characters match, but there is more to the name than
-                        // this. We need to get the full process name. 
+                        // this. We need to get the full process name.  Use proc_pidpath, which will get
+                        // us the full path to the executed process.
 
-                        int proc_args_mib[3] = { CTL_KERN, KERN_PROCARGS2, proc_infos[i].kp_proc.p_pid };
+                        char proc_path_buf[PATH_MAX];
                         
-                        // Get PATH_MAX for argv[0] plus 4 bytes for the argc
-                        char arg_data[PATH_MAX+4];
-                        size_t arg_data_size = sizeof(arg_data);
-                         // Skip the 4 byte argc integer value to get to argv[0]
-                        const char *argv0 = arg_data + 4;
-                        if (::sysctl (proc_args_mib, 3, arg_data, &arg_data_size , NULL, 0) == 0)
+                        int return_val = proc_pidpath (proc_infos[i].kp_proc.p_pid, proc_path_buf, PATH_MAX);
+                        if (return_val > 0)
                         {
-                            const char *argv_basename = strrchr(argv0, '/');
+                            // Okay, now search backwards from that to see if there is a
+                            // slash in the name.  Note, even though we got all the args we don't care
+                            // because the list data is just a bunch of concatenated null terminated strings
+                            // so strrchr will start from the end of argv0.
+                            
+                            const char *argv_basename = strrchr(proc_path_buf, '/');
                             if (argv_basename)
                             {
                                 // Skip the '/'
@@ -486,7 +489,7 @@ GetAllInfosMatchingName(const char *full_process_name, std::vector<struct kinfo_
                             else
                             {
                                 // We didn't find a directory delimiter in the process argv[0], just use what was in there
-                                argv_basename = argv0;
+                                argv_basename = proc_path_buf;
                             }
 
                             if (argv_basename)
-- 
2.7.4