From 14897d0f998d664660cf7c371518e9f6de6133ba Mon Sep 17 00:00:00 2001
From: Jan Kratochvil <jan.kratochvil@redhat.com>
Date: Sat, 7 Sep 2019 22:06:22 +0200
Subject: [PATCH] Add command-line parameter -p|--pid.

---
 src/LLGDBMain.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/LLGDBMain.cpp b/src/LLGDBMain.cpp
index 39dac35..506fe50 100644
--- a/src/LLGDBMain.cpp
+++ b/src/LLGDBMain.cpp
@@ -345,6 +345,7 @@ static char *completion_entry_function(const char *text, int matches) {
 
 static std::deque<std::string> opt_iex, opt_ex;
 static std::optional<std::string> opt_exec, opt_core;
+static std::optional<lldb::pid_t> opt_pid;
 static std::vector<std::string> opt_args;
 
 std::string string_quote(std::string &&str) {
@@ -376,6 +377,11 @@ std::optional<std::string> next_arg() {
     }
     return cmd;
   }
+  if (opt_pid) {
+    std::string retval = (boost::format("attach %1%") % *opt_pid).str();
+    opt_pid.reset();
+    return retval;
+  }
   if (!opt_ex.empty()) {
     std::string retval = opt_ex.front();
     opt_ex.pop_front();
@@ -391,6 +397,10 @@ int main(int argc, char **argv) {
 
   for (int argi = 1; argi < argc; ++argi) {
     std::string arg = argv[argi];
+    auto str_to_pid = [](const std::string &str){
+      lldb::pid_t pid_test = atoi(str.c_str());
+      return (boost::format("%1%") % pid_test).str() != str || pid_test <= 0 ? 0 : pid_test;
+    };
     if (arg == "-iex") {
       const char *cmd = argv[++argi];
       assert(cmd);
@@ -410,8 +420,14 @@ int main(int argc, char **argv) {
 	arg = argv[argi];
 	opt_args.push_back(std::move(arg));
       }
+    } else if (arg == "-p" || arg == "--pid") {
+      opt_pid = str_to_pid(argv[++argi]);
+      if (opt_pid == 0)
+	error(1,0,"Invalid PID: %s",argv[argi]);
     } else if (!opt_exec)
       opt_exec=std::move(arg);
+    else if (!opt_pid && str_to_pid(arg) > 0)
+      opt_pid = str_to_pid(arg);
     else if (!opt_core)
       opt_core=std::move(arg);
     else
-- 
1.8.3.1