am 3dbcb6d6: am 98d07897: Merge "Windows adb: Make client stdout and stderr handles uninheritable"

* commit '3dbcb6d6c6befc406e4ce4e2b7aa9ad2635dfbb8':
  Windows adb: Make client stdout and stderr handles uninheritable

1 files changed, 21 insertions, 0 deletions

diff --git a/adb/adb.c b/adb/adb.c
index 8be5765..1bf4b9e 100644
--- a/adb/adb.c
+++ b/adb/adb.c
@@ -1018,6 +1018,7 @@ int launch_server(int server_port)
     /* message since the pipe handles must be inheritable, we use a     */
     /* security attribute                                               */
     HANDLE                pipe_read, pipe_write;
+    HANDLE                stdout_handle, stderr_handle;
     SECURITY_ATTRIBUTES   sa;
     STARTUPINFO           startup;
     PROCESS_INFORMATION   pinfo;
@@ -1037,6 +1038,26 @@ int launch_server(int server_port)
 
     SetHandleInformation( pipe_read, HANDLE_FLAG_INHERIT, 0 );
 
+    /* Some programs want to launch an adb command and collect its output by
+     * calling CreateProcess with inheritable stdout/stderr handles, then
+     * using read() to get its output. When this happens, the stdout/stderr
+     * handles passed to the adb client process will also be inheritable.
+     * When starting the adb server here, care must be taken to reset them
+     * to non-inheritable.
+     * Otherwise, something bad happens: even if the adb command completes,
+     * the calling process is stuck while read()-ing from the stdout/stderr
+     * descriptors, because they're connected to corresponding handles in the
+     * adb server process (even if the latter never uses/writes to them).
+     */
+    stdout_handle = GetStdHandle( STD_OUTPUT_HANDLE );
+    stderr_handle = GetStdHandle( STD_ERROR_HANDLE );
+    if (stdout_handle != INVALID_HANDLE_VALUE) {
+        SetHandleInformation( stdout_handle, HANDLE_FLAG_INHERIT, 0 );
+    }
+    if (stderr_handle != INVALID_HANDLE_VALUE) {
+        SetHandleInformation( stderr_handle, HANDLE_FLAG_INHERIT, 0 );
+    }
+
     ZeroMemory( &startup, sizeof(startup) );
     startup.cb = sizeof(startup);
     startup.hStdInput  = GetStdHandle( STD_INPUT_HANDLE );