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418 lines
17 KiB
C
418 lines
17 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* # CategoryProcess
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*
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* Process control support.
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*
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* These functions provide a cross-platform way to spawn and manage OS-level
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* processes.
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*
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* You can create a new subprocess with SDL_CreateProcess() and optionally
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* read and write to it using SDL_ReadProcess() or SDL_GetProcessInput() and
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* SDL_GetProcessOutput(). If more advanced functionality like chaining input
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* between processes is necessary, you can use
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* SDL_CreateProcessWithProperties().
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*
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* You can get the status of a created process with SDL_WaitProcess(), or
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* terminate the process with SDL_KillProcess().
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*
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* Don't forget to call SDL_DestroyProcess() to clean up, whether the process
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* process was killed, terminated on its own, or is still running!
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*/
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#ifndef SDL_process_h_
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#define SDL_process_h_
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#include <SDL3/SDL_stdinc.h>
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#include <SDL3/SDL_error.h>
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#include <SDL3/SDL_iostream.h>
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#include <SDL3/SDL_properties.h>
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#include <SDL3/SDL_begin_code.h>
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct SDL_Process SDL_Process;
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/**
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* Create a new process.
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*
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* The path to the executable is supplied in args[0]. args[1..N] are
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* additional arguments passed on the command line of the new process, and the
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* argument list should be terminated with a NULL, e.g.:
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*
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* ```c
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* const char *args[] = { "myprogram", "argument", NULL };
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* ```
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*
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* Setting pipe_stdio to true is equivalent to setting
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* `SDL_PROP_PROCESS_CREATE_STDIN_NUMBER` and
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* `SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER` to `SDL_PROCESS_STDIO_APP`, and
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* will allow the use of SDL_ReadProcess() or SDL_GetProcessInput() and
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* SDL_GetProcessOutput().
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*
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* See SDL_CreateProcessWithProperties() for more details.
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*
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* \param args the path and arguments for the new process.
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* \param pipe_stdio true to create pipes to the process's standard input and
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* from the process's standard output, false for the process
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* to have no input and inherit the application's standard
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* output.
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* \returns the newly created and running process, or NULL if the process
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* couldn't be created.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_GetProcessProperties
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* \sa SDL_ReadProcess
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* \sa SDL_GetProcessInput
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* \sa SDL_GetProcessOutput
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* \sa SDL_KillProcess
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* \sa SDL_WaitProcess
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* \sa SDL_DestroyProcess
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*/
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extern SDL_DECLSPEC SDL_Process *SDLCALL SDL_CreateProcess(const char * const *args, bool pipe_stdio);
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/**
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* Description of where standard I/O should be directed when creating a
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* process.
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*
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* If a standard I/O stream is set to SDL_PROCESS_STDIO_INHERITED, it will go
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* to the same place as the application's I/O stream. This is the default for
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* standard output and standard error.
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*
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* If a standard I/O stream is set to SDL_PROCESS_STDIO_NULL, it is connected
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* to `NUL:` on Windows and `/dev/null` on POSIX systems. This is the default
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* for standard input.
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*
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* If a standard I/O stream is set to SDL_PROCESS_STDIO_APP, it is connected
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* to a new SDL_IOStream that is available to the application. Standard input
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* will be available as `SDL_PROP_PROCESS_STDIN_POINTER` and allows
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* SDL_GetProcessInput(), standard output will be available as
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* `SDL_PROP_PROCESS_STDOUT_POINTER` and allows SDL_ReadProcess() and
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* SDL_GetProcessOutput(), and standard error will be available as
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* `SDL_PROP_PROCESS_STDERR_POINTER` in the properties for the created
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* process.
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*
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* If a standard I/O stream is set to SDL_PROCESS_STDIO_REDIRECT, it is
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* connected to an existing SDL_IOStream provided by the application. Standard
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* input is provided using `SDL_PROP_PROCESS_CREATE_STDIN_POINTER`, standard
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* output is provided using `SDL_PROP_PROCESS_CREATE_STDOUT_POINTER`, and
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* standard error is provided using `SDL_PROP_PROCESS_CREATE_STDERR_POINTER`
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* in the creation properties. These existing streams should be closed by the
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* application once the new process is created.
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*
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* In order to use an SDL_IOStream with SDL_PROCESS_STDIO_REDIRECT, it must
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* have `SDL_PROP_IOSTREAM_WINDOWS_HANDLE_POINTER` or
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* `SDL_PROP_IOSTREAM_FILE_DESCRIPTOR_NUMBER` set. This is true for streams
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* representing files and process I/O.
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*
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* \since This enum is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_GetProcessProperties
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* \sa SDL_ReadProcess
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* \sa SDL_GetProcessInput
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* \sa SDL_GetProcessOutput
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*/
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typedef enum SDL_ProcessIO
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{
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SDL_PROCESS_STDIO_INHERITED, /**< The I/O stream is inherited from the application. */
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SDL_PROCESS_STDIO_NULL, /**< The I/O stream is ignored. */
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SDL_PROCESS_STDIO_APP, /**< The I/O stream is connected to a new SDL_IOStream that the application can read or write */
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SDL_PROCESS_STDIO_REDIRECT /**< The I/O stream is redirected to an existing SDL_IOStream. */
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} SDL_ProcessIO;
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/**
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* Create a new process with the specified properties.
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*
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* These are the supported properties:
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*
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* - `SDL_PROP_PROCESS_CREATE_ARGS_POINTER`: an array of strings containing
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* the program to run, any arguments, and a NULL pointer, e.g. const char
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* *args[] = { "myprogram", "argument", NULL }. This is a required property.
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* - `SDL_PROP_PROCESS_CREATE_ENVIRONMENT_POINTER`: an SDL_Environment
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* pointer. If this property is set, it will be the entire environment for
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* the process, otherwise the current environment is used.
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* - `SDL_PROP_PROCESS_CREATE_STDIN_NUMBER`: an SDL_ProcessIO value describing
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* where standard input for the process comes from, defaults to
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* `SDL_PROCESS_STDIO_NULL`.
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* - `SDL_PROP_PROCESS_CREATE_STDIN_POINTER`: an SDL_IOStream pointer used for
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* standard input when `SDL_PROP_PROCESS_CREATE_STDIN_NUMBER` is set to
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* `SDL_PROCESS_STDIO_REDIRECT`.
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* - `SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER`: an SDL_ProcessIO value
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* describing where standard output for the process goes go, defaults to
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* `SDL_PROCESS_STDIO_INHERITED`.
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* - `SDL_PROP_PROCESS_CREATE_STDOUT_POINTER`: an SDL_IOStream pointer used
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* for standard output when `SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER` is set
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* to `SDL_PROCESS_STDIO_REDIRECT`.
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* - `SDL_PROP_PROCESS_CREATE_STDERR_NUMBER`: an SDL_ProcessIO value
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* describing where standard error for the process goes go, defaults to
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* `SDL_PROCESS_STDIO_INHERITED`.
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* - `SDL_PROP_PROCESS_CREATE_STDERR_POINTER`: an SDL_IOStream pointer used
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* for standard error when `SDL_PROP_PROCESS_CREATE_STDERR_NUMBER` is set to
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* `SDL_PROCESS_STDIO_REDIRECT`.
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* - `SDL_PROP_PROCESS_CREATE_STDERR_TO_STDOUT_BOOLEAN`: true if the error
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* output of the process should be redirected into the standard output of
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* the process. This property has no effect if
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* `SDL_PROP_PROCESS_CREATE_STDERR_NUMBER` is set.
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* - `SDL_PROP_PROCESS_CREATE_BACKGROUND_BOOLEAN`: true if the process should
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* run in the background. In this case the default input and output is
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* `SDL_PROCESS_STDIO_NULL` and the exitcode of the process is not
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* available, and will always be 0.
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*
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* On POSIX platforms, wait() and waitpid(-1, ...) should not be called, and
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* SIGCHLD should not be ignored or handled because those would prevent SDL
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* from properly tracking the lifetime of the underlying process. You should
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* use SDL_WaitProcess() instead.
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*
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* \param props the properties to use.
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* \returns the newly created and running process, or NULL if the process
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* couldn't be created.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_GetProcessProperties
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* \sa SDL_ReadProcess
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* \sa SDL_GetProcessInput
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* \sa SDL_GetProcessOutput
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* \sa SDL_KillProcess
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* \sa SDL_WaitProcess
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* \sa SDL_DestroyProcess
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*/
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extern SDL_DECLSPEC SDL_Process *SDLCALL SDL_CreateProcessWithProperties(SDL_PropertiesID props);
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#define SDL_PROP_PROCESS_CREATE_ARGS_POINTER "SDL.process.create.args"
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#define SDL_PROP_PROCESS_CREATE_ENVIRONMENT_POINTER "SDL.process.create.environment"
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#define SDL_PROP_PROCESS_CREATE_STDIN_NUMBER "SDL.process.create.stdin_option"
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#define SDL_PROP_PROCESS_CREATE_STDIN_POINTER "SDL.process.create.stdin_source"
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#define SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER "SDL.process.create.stdout_option"
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#define SDL_PROP_PROCESS_CREATE_STDOUT_POINTER "SDL.process.create.stdout_source"
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#define SDL_PROP_PROCESS_CREATE_STDERR_NUMBER "SDL.process.create.stderr_option"
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#define SDL_PROP_PROCESS_CREATE_STDERR_POINTER "SDL.process.create.stderr_source"
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#define SDL_PROP_PROCESS_CREATE_STDERR_TO_STDOUT_BOOLEAN "SDL.process.create.stderr_to_stdout"
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#define SDL_PROP_PROCESS_CREATE_BACKGROUND_BOOLEAN "SDL.process.create.background"
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/**
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* Get the properties associated with a process.
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*
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* The following read-only properties are provided by SDL:
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*
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* - `SDL_PROP_PROCESS_PID_NUMBER`: the process ID of the process.
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* - `SDL_PROP_PROCESS_STDIN_POINTER`: an SDL_IOStream that can be used to
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* write input to the process, if it was created with
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* `SDL_PROP_PROCESS_CREATE_STDIN_NUMBER` set to `SDL_PROCESS_STDIO_APP`.
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* - `SDL_PROP_PROCESS_STDOUT_POINTER`: a non-blocking SDL_IOStream that can
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* be used to read output from the process, if it was created with
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* `SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER` set to `SDL_PROCESS_STDIO_APP`.
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* - `SDL_PROP_PROCESS_STDERR_POINTER`: a non-blocking SDL_IOStream that can
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* be used to read error output from the process, if it was created with
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* `SDL_PROP_PROCESS_CREATE_STDERR_NUMBER` set to `SDL_PROCESS_STDIO_APP`.
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* - `SDL_PROP_PROCESS_BACKGROUND_BOOLEAN`: true if the process is running in
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* the background.
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*
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* \param process the process to query.
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* \returns a valid property ID on success or 0 on failure; call
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* SDL_GetError() for more information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_CreateProcessWithProperties
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*/
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extern SDL_DECLSPEC SDL_PropertiesID SDLCALL SDL_GetProcessProperties(SDL_Process *process);
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#define SDL_PROP_PROCESS_PID_NUMBER "SDL.process.pid"
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#define SDL_PROP_PROCESS_STDIN_POINTER "SDL.process.stdin"
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#define SDL_PROP_PROCESS_STDOUT_POINTER "SDL.process.stdout"
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#define SDL_PROP_PROCESS_STDERR_POINTER "SDL.process.stderr"
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#define SDL_PROP_PROCESS_BACKGROUND_BOOLEAN "SDL.process.background"
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/**
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* Read all the output from a process.
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*
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* If a process was created with I/O enabled, you can use this function to
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* read the output. This function blocks until the process is complete,
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* capturing all output, and providing the process exit code.
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*
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* The data is allocated with a zero byte at the end (null terminated) for
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* convenience. This extra byte is not included in the value reported via
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* `datasize`.
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*
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* The data should be freed with SDL_free().
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*
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* \param process The process to read.
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* \param datasize a pointer filled in with the number of bytes read, may be
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* NULL.
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* \param exitcode a pointer filled in with the process exit code if the
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* process has exited, may be NULL.
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* \returns the data or NULL on failure; call SDL_GetError() for more
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* information.
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*
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* \threadsafety This function is not thread safe.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_DestroyProcess
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*/
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extern SDL_DECLSPEC void * SDLCALL SDL_ReadProcess(SDL_Process *process, size_t *datasize, int *exitcode);
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/**
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* Get the SDL_IOStream associated with process standard input.
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*
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* The process must have been created with SDL_CreateProcess() and pipe_stdio
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* set to true, or with SDL_CreateProcessWithProperties() and
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* `SDL_PROP_PROCESS_CREATE_STDIN_NUMBER` set to `SDL_PROCESS_STDIO_APP`.
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*
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* Writing to this stream can return less data than expected if the process
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* hasn't read its input. It may be blocked waiting for its output to be read,
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* if so you may need to call SDL_GetProcessOutput() and read the output in
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* parallel with writing input.
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*
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* \param process The process to get the input stream for.
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* \returns the input stream or NULL on failure; call SDL_GetError() for more
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* information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_GetProcessOutput
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*/
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extern SDL_DECLSPEC SDL_IOStream *SDLCALL SDL_GetProcessInput(SDL_Process *process);
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/**
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* Get the SDL_IOStream associated with process standard output.
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*
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* The process must have been created with SDL_CreateProcess() and pipe_stdio
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* set to true, or with SDL_CreateProcessWithProperties() and
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* `SDL_PROP_PROCESS_CREATE_STDOUT_NUMBER` set to `SDL_PROCESS_STDIO_APP`.
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*
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* Reading from this stream can return 0 with SDL_GetIOStatus() returning
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* SDL_IO_STATUS_NOT_READY if no output is available yet.
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*
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* \param process The process to get the output stream for.
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* \returns the output stream or NULL on failure; call SDL_GetError() for more
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* information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_GetProcessInput
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*/
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extern SDL_DECLSPEC SDL_IOStream *SDLCALL SDL_GetProcessOutput(SDL_Process *process);
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/**
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* Stop a process.
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*
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* \param process The process to stop.
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* \param force true to terminate the process immediately, false to try to
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* stop the process gracefully. In general you should try to stop
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* the process gracefully first as terminating a process may
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* leave it with half-written data or in some other unstable
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* state.
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* \returns true on success or false on failure; call SDL_GetError() for more
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* information.
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*
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* \threadsafety This function is not thread safe.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_WaitProcess
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* \sa SDL_DestroyProcess
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*/
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extern SDL_DECLSPEC bool SDLCALL SDL_KillProcess(SDL_Process *process, bool force);
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/**
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* Wait for a process to finish.
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*
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* This can be called multiple times to get the status of a process.
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*
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* The exit code will be the exit code of the process if it terminates
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* normally, a negative signal if it terminated due to a signal, or -255
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* otherwise. It will not be changed if the process is still running.
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*
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* \param process The process to wait for.
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* \param block If true, block until the process finishes; otherwise, report
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* on the process' status.
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* \param exitcode a pointer filled in with the process exit code if the
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* process has exited, may be NULL.
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* \returns true if the process exited, false otherwise.
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*
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* \threadsafety This function is not thread safe.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_KillProcess
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* \sa SDL_DestroyProcess
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*/
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extern SDL_DECLSPEC bool SDLCALL SDL_WaitProcess(SDL_Process *process, bool block, int *exitcode);
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/**
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* Destroy a previously created process object.
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*
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* Note that this does not stop the process, just destroys the SDL object used
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* to track it. If you want to stop the process you should use
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* SDL_KillProcess().
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*
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* \param process The process object to destroy.
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*
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* \threadsafety This function is not thread safe.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateProcess
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* \sa SDL_CreateProcessWithProperties
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* \sa SDL_KillProcess
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*/
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extern SDL_DECLSPEC void SDLCALL SDL_DestroyProcess(SDL_Process *process);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include <SDL3/SDL_close_code.h>
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#endif /* SDL_process_h_ */
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