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+/*
+ * Copyright (c) 2011-2016 Ryan Prichard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef WINPTY_H
+#define WINPTY_H
+
+#include <windows.h>
+
+#include "winpty_constants.h"
+
+/* On 32-bit Windows, winpty functions have the default __cdecl (not __stdcall)
+ * calling convention. (64-bit Windows has only a single calling convention.)
+ * When compiled with __declspec(dllexport), with either MinGW or MSVC, the
+ * winpty functions are unadorned--no underscore prefix or '@nn' suffix--so
+ * GetProcAddress can be used easily. */
+#ifdef COMPILING_WINPTY_DLL
+#define WINPTY_API __declspec(dllexport)
+#else
+#define WINPTY_API __declspec(dllimport)
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* The winpty API uses wide characters, instead of UTF-8, to avoid conversion
+ * complications related to surrogates. Windows generally tolerates unpaired
+ * surrogates in text, which makes conversion to and from UTF-8 ambiguous and
+ * complicated. (There are different UTF-8 variants that deal with UTF-16
+ * surrogates differently.) */
+
+
+
+/*****************************************************************************
+ * Error handling. */
+
+/* All the APIs have an optional winpty_error_t output parameter. If a
+ * non-NULL argument is specified, then either the API writes NULL to the
+ * value (on success) or writes a newly allocated winpty_error_t object. The
+ * object must be freed using winpty_error_free. */
+
+/* An error object. */
+typedef struct winpty_error_s winpty_error_t;
+typedef winpty_error_t *winpty_error_ptr_t;
+
+/* An error code -- one of WINPTY_ERROR_xxx. */
+typedef DWORD winpty_result_t;
+
+/* Gets the error code from the error object. */
+WINPTY_API winpty_result_t winpty_error_code(winpty_error_ptr_t err);
+
+/* Returns a textual representation of the error. The string is freed when
+ * the error is freed. */
+WINPTY_API LPCWSTR winpty_error_msg(winpty_error_ptr_t err);
+
+/* Free the error object. Every error returned from the winpty API must be
+ * freed. */
+WINPTY_API void winpty_error_free(winpty_error_ptr_t err);
+
+
+
+/*****************************************************************************
+ * Configuration of a new agent. */
+
+/* The winpty_config_t object is not thread-safe. */
+typedef struct winpty_config_s winpty_config_t;
+
+/* Allocate a winpty_config_t value. Returns NULL on error. There are no
+ * required settings -- the object may immediately be used. agentFlags is a
+ * set of zero or more WINPTY_FLAG_xxx values. An unrecognized flag results
+ * in an assertion failure. */
+WINPTY_API winpty_config_t *
+winpty_config_new(UINT64 agentFlags, winpty_error_ptr_t *err /*OPTIONAL*/);
+
+/* Free the cfg object after passing it to winpty_open. */
+WINPTY_API void winpty_config_free(winpty_config_t *cfg);
+
+WINPTY_API void
+winpty_config_set_initial_size(winpty_config_t *cfg, int cols, int rows);
+
+/* Set the mouse mode to one of the WINPTY_MOUSE_MODE_xxx constants. */
+WINPTY_API void
+winpty_config_set_mouse_mode(winpty_config_t *cfg, int mouseMode);
+
+/* Amount of time to wait for the agent to startup and to wait for any given
+ * agent RPC request. Must be greater than 0. Can be INFINITE. */
+WINPTY_API void
+winpty_config_set_agent_timeout(winpty_config_t *cfg, DWORD timeoutMs);
+
+
+
+/*****************************************************************************
+ * Start the agent. */
+
+/* The winpty_t object is thread-safe. */
+typedef struct winpty_s winpty_t;
+
+/* Starts the agent. Returns NULL on error. This process will connect to the
+ * agent over a control pipe, and the agent will open data pipes (e.g. CONIN
+ * and CONOUT). */
+WINPTY_API winpty_t *
+winpty_open(const winpty_config_t *cfg,
+ winpty_error_ptr_t *err /*OPTIONAL*/);
+
+/* A handle to the agent process. This value is valid for the lifetime of the
+ * winpty_t object. Do not close it. */
+WINPTY_API HANDLE winpty_agent_process(winpty_t *wp);
+
+
+
+/*****************************************************************************
+ * I/O pipes. */
+
+/* Returns the names of named pipes used for terminal I/O. Each input or
+ * output direction uses a different half-duplex pipe. The agent creates
+ * these pipes, and the client can connect to them using ordinary I/O methods.
+ * The strings are freed when the winpty_t object is freed.
+ *
+ * winpty_conerr_name returns NULL unless WINPTY_FLAG_CONERR is specified.
+ *
+ * N.B.: CreateFile does not block when connecting to a local server pipe. If
+ * the server pipe does not exist or is already connected, then it fails
+ * instantly. */
+WINPTY_API LPCWSTR winpty_conin_name(winpty_t *wp);
+WINPTY_API LPCWSTR winpty_conout_name(winpty_t *wp);
+WINPTY_API LPCWSTR winpty_conerr_name(winpty_t *wp);
+
+
+
+/*****************************************************************************
+ * winpty agent RPC call: process creation. */
+
+/* The winpty_spawn_config_t object is not thread-safe. */
+typedef struct winpty_spawn_config_s winpty_spawn_config_t;
+
+/* winpty_spawn_config strings do not need to live as long as the config
+ * object. They are copied. Returns NULL on error. spawnFlags is a set of
+ * zero or more WINPTY_SPAWN_FLAG_xxx values. An unrecognized flag results in
+ * an assertion failure.
+ *
+ * env is a a pointer to an environment block like that passed to
+ * CreateProcess--a contiguous array of NUL-terminated "VAR=VAL" strings
+ * followed by a final NUL terminator.
+ *
+ * N.B.: If you want to gather all of the child's output, you may want the
+ * WINPTY_SPAWN_FLAG_AUTO_SHUTDOWN flag.
+ */
+WINPTY_API winpty_spawn_config_t *
+winpty_spawn_config_new(UINT64 spawnFlags,
+ LPCWSTR appname /*OPTIONAL*/,
+ LPCWSTR cmdline /*OPTIONAL*/,
+ LPCWSTR cwd /*OPTIONAL*/,
+ LPCWSTR env /*OPTIONAL*/,
+ winpty_error_ptr_t *err /*OPTIONAL*/);
+
+/* Free the cfg object after passing it to winpty_spawn. */
+WINPTY_API void winpty_spawn_config_free(winpty_spawn_config_t *cfg);
+
+/*
+ * Spawns the new process.
+ *
+ * The function initializes all output parameters to zero or NULL.
+ *
+ * On success, the function returns TRUE. For each of process_handle and
+ * thread_handle that is non-NULL, the HANDLE returned from CreateProcess is
+ * duplicated from the agent and returned to the winpty client. The client is
+ * responsible for closing these HANDLES.
+ *
+ * On failure, the function returns FALSE, and if err is non-NULL, then *err
+ * is set to an error object.
+ *
+ * If the agent's CreateProcess call failed, then *create_process_error is set
+ * to GetLastError(), and the WINPTY_ERROR_SPAWN_CREATE_PROCESS_FAILED error
+ * is returned.
+ *
+ * winpty_spawn can only be called once per winpty_t object. If it is called
+ * before the output data pipe(s) is/are connected, then collected output is
+ * buffered until the pipes are connected, rather than being discarded.
+ *
+ * N.B.: GetProcessId works even if the process has exited. The PID is not
+ * recycled until the NT process object is freed.
+ * (https://blogs.msdn.microsoft.com/oldnewthing/20110107-00/?p=11803)
+ */
+WINPTY_API BOOL
+winpty_spawn(winpty_t *wp,
+ const winpty_spawn_config_t *cfg,
+ HANDLE *process_handle /*OPTIONAL*/,
+ HANDLE *thread_handle /*OPTIONAL*/,
+ DWORD *create_process_error /*OPTIONAL*/,
+ winpty_error_ptr_t *err /*OPTIONAL*/);
+
+
+
+/*****************************************************************************
+ * winpty agent RPC calls: everything else */
+
+/* Change the size of the Windows console window. */
+WINPTY_API BOOL
+winpty_set_size(winpty_t *wp, int cols, int rows,
+ winpty_error_ptr_t *err /*OPTIONAL*/);
+
+/* Gets a list of processes attached to the console. */
+WINPTY_API int
+winpty_get_console_process_list(winpty_t *wp, int *processList, const int processCount,
+ winpty_error_ptr_t *err /*OPTIONAL*/);
+
+/* Frees the winpty_t object and the OS resources contained in it. This
+ * call breaks the connection with the agent, which should then close its
+ * console, terminating the processes attached to it.
+ *
+ * This function must not be called if any other threads are using the
+ * winpty_t object. Undefined behavior results. */
+WINPTY_API void winpty_free(winpty_t *wp);
+
+
+
+/****************************************************************************/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WINPTY_H */