linux: simple support for process input and output
git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@128137 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Plugins/Process/Linux/ProcessLinux.cpp b/source/Plugins/Process/Linux/ProcessLinux.cpp
index f62a303..b3405dd 100644
--- a/source/Plugins/Process/Linux/ProcessLinux.cpp
+++ b/source/Plugins/Process/Linux/ProcessLinux.cpp
@@ -8,6 +8,8 @@
//===----------------------------------------------------------------------===//
// C Includes
+#include <errno.h>
+
// C++ Includes
// Other libraries and framework includes
#include "lldb/Core/PluginManager.h"
@@ -397,6 +399,40 @@
return m_byte_order;
}
+size_t
+ProcessLinux::PutSTDIN(const char *buf, size_t len, Error &error)
+{
+ ssize_t status;
+ if ((status = write(m_monitor->GetTerminalFD(), buf, len)) < 0)
+ {
+ error.SetErrorToErrno();
+ return 0;
+ }
+ return status;
+}
+
+size_t
+ProcessLinux::GetSTDOUT(char *buf, size_t len, Error &error)
+{
+ ssize_t bytes_read;
+
+ // The terminal file descriptor is always in non-block mode.
+ if ((bytes_read = read(m_monitor->GetTerminalFD(), buf, len)) < 0)
+ {
+ if (errno != EAGAIN)
+ error.SetErrorToErrno();
+ return 0;
+ }
+ return bytes_read;
+}
+
+size_t
+ProcessLinux::GetSTDERR(char *buf, size_t len, Error &error)
+{
+ return GetSTDOUT(buf, len, error);
+}
+
+
//------------------------------------------------------------------------------
// ProcessInterface protocol.
diff --git a/source/Plugins/Process/Linux/ProcessLinux.h b/source/Plugins/Process/Linux/ProcessLinux.h
index 18e5aa7..7335611 100644
--- a/source/Plugins/Process/Linux/ProcessLinux.h
+++ b/source/Plugins/Process/Linux/ProcessLinux.h
@@ -138,6 +138,15 @@
virtual lldb::addr_t
GetImageInfoAddress();
+ virtual size_t
+ PutSTDIN(const char *buf, size_t len, lldb_private::Error &error);
+
+ virtual size_t
+ GetSTDOUT(char *buf, size_t len, lldb_private::Error &error);
+
+ virtual size_t
+ GetSTDERR(char *buf, size_t len, lldb_private::Error &error);
+
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
diff --git a/source/Plugins/Process/Linux/ProcessMonitor.cpp b/source/Plugins/Process/Linux/ProcessMonitor.cpp
index 490ca6f..c5909c8 100644
--- a/source/Plugins/Process/Linux/ProcessMonitor.cpp
+++ b/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));