Prototype implementation of zygotes.

Limitations that need addressing still:
- Doesn't forcibly terminate children that should have exited but haven't

Enable with env var ENABLE_ZYGOTE_MANAGER=1.

BUG=11841
TEST=
start the browser, then make chrome and all .pak files unreadable; or alternately, start an installed browser, and uninstall the browser while it's running.  Then create a new tab and browse to two new sites. 

Here's an example script to hide and unhide the .pak files (note: do not move the directory they're in, that doesn't work):

#!/bin/sh
chmod_all() {
   chmod $1 sconsbuild/Debug/chrome
   for path in . locales obj/chrome/app/intermediate/repack obj/global_intermediate/* themes
   do
     chmod $1 sconsbuild/Debug/$path/*.pak
   done
}
case $1 in
hide) chmod_all 000 ;;
show) chmod_all 755 ;;
esac


Review URL: http://codereview.chromium.org/115773

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17840 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 19 insertions, 0 deletions

diff --git a/base/process_util_linux.cc b/base/process_util_linux.cc
index ed8d32d..78725cc 100644
--- a/base/process_util_linux.cc
+++ b/base/process_util_linux.cc
@@ -17,6 +17,7 @@
 #include "base/logging.h"
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
+#include "base/zygote_manager.h"
 
 namespace {
 
@@ -41,6 +42,22 @@ void GetProcStats(pid_t pid, std::vector<std::string>* proc_stats) {
 
 namespace base {
 
+bool ForkApp(const std::vector<std::string>& argv,
+             const file_handle_mapping_vector& fds_to_remap,
+             ProcessHandle* process_handle) {
+  ZygoteManager* zm = ZygoteManager::Get();
+  if (!zm)
+    return LaunchApp(argv, fds_to_remap, false, process_handle);
+
+  pid_t pid = zm->LongFork(argv, fds_to_remap);
+  if (pid < 0)
+    return false;
+
+  if (process_handle)
+    *process_handle = pid;
+  return true;
+}
+
 bool LaunchApp(const std::vector<std::string>& argv,
                const file_handle_mapping_vector& fds_to_remap,
                bool wait, ProcessHandle* process_handle) {
@@ -65,6 +82,8 @@ bool LaunchApp(const std::vector<std::string>& argv,
       argv_cstr[i] = const_cast<char*>(argv[i].c_str());
     argv_cstr[argv.size()] = NULL;
     execvp(argv_cstr[0], argv_cstr.get());
+    LOG(ERROR) << "LaunchApp: exec failed!, argv_cstr[0] " << argv_cstr[0]
+        << ", errno " << errno;
     exit(127);
   } else {
     if (wait)