linux: simple support for process input and output
llvm-svn: 128137
diff --git a/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp b/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
index 490ca6f..c5909c8 100644
--- a/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
+++ b/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
@@ -114,6 +114,27 @@
return bytes_written;
}
+// Simple helper function to ensure flags are enabled on the given file
+// descriptor.
+static bool
+EnsureFDFlags(int fd, int flags, Error &error)
+{
+ int status;
+
+ if ((status = fcntl(fd, F_GETFL)) == -1)
+ {
+ error.SetErrorToErrno();
+ return false;
+ }
+
+ if (fcntl(fd, F_SETFL, status | flags) == -1)
+ {
+ error.SetErrorToErrno();
+ return false;
+ }
+
+ return true;
+}
//------------------------------------------------------------------------------
/// @class Operation
@@ -706,6 +727,12 @@
monitor->m_terminal_fd = terminal.ReleaseMasterFileDescriptor();
monitor->m_pid = pid;
+ // Set the terminal fd to be in non blocking mode (it simplifies the
+ // implementation of ProcessLinux::GetSTDOUT to have a non-blocking
+ // descriptor to read from).
+ if (!EnsureFDFlags(monitor->m_terminal_fd, O_NONBLOCK, args->m_error))
+ goto FINISH;
+
// Update the process thread list with this new thread and mark it as
// current.
inferior.reset(new LinuxThread(process, pid));