From 8dcdb57dafd554e801de97012e7d0ef6ec63a5ac Mon Sep 17 00:00:00 2001
From: Josh Gao <jmgao@google.com>
Date: Fri, 23 Oct 2015 15:03:31 -0700
Subject: [PATCH] adb: Mask SIGTTIN so that I/O works when backgrounded.

SIGTTIN gets sent to the process when we attempt to read from
stdin when we're in the background, which stops the process by
default. Mask the signal so that the read returns -1 with errno
set to EIO, instead.

Change-Id: I4ae626b0670c05a1a05165539b9eed709e83d536
---
 adb/commandline.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/adb/commandline.cpp b/adb/commandline.cpp
index bc5ba38a0..a915a3359 100644
--- a/adb/commandline.cpp
+++ b/adb/commandline.cpp
@@ -39,6 +39,7 @@
 #include <base/strings.h>
 
 #if !defined(_WIN32)
+#include <signal.h>
 #include <termios.h>
 #include <unistd.h>
 #endif
@@ -440,6 +441,14 @@ static void* stdin_read_thread(void* x) {
 
     adb_thread_setname("stdin reader");
 
+#ifndef __WIN32
+    // Mask SIGTTIN in case we're in a backgrounded process
+    sigset_t sigset;
+    sigemptyset(&sigset);
+    sigaddset(&sigset, SIGTTIN);
+    pthread_sigmask(SIG_BLOCK, &sigset, nullptr);
+#endif
+
     char raw_buffer[1024];
     char* buffer_ptr = raw_buffer;
     size_t buffer_size = sizeof(raw_buffer);