Safe Haskell	None
Language	GHC2021

SDL3.Sys.Process

Contents

Function aliases

Description

Process control support.

These functions provide a cross-platform way to spawn and manage OS-level processes.

You can create a new subprocess with createProcess and optionally read and write to it using readProcess or getProcessInput and getProcessOutput. If more advanced functionality like chaining input between processes is necessary, you can use createProcessWithProperties.

You can get the status of a created process with waitProcess, or terminate the process with killProcess.

Don't forget to call destroyProcess to clean up, whether the process process was killed, terminated on its own, or is still running! An opaque handle representing a system process.

See also: createProcess

FFI conventions

Unsuffixed aliases are unsafe foreign imports; aliases suffixed Safe are safe. Functions whose callbacks fire during the call export only the Safe alias (the genuine unsafe import stays reachable under SDL3.Sys.Bindgen.Process.Unsafe); functions curated unsafe-only export only the unsuffixed one. Each alias's documentation records its flavor and rationale.

Full conventions: SDL3.Sys.

Since: 3.2.0

Synopsis

module SDL3.Sys.Bindgen.Process
createProcess :: PtrConst (PtrConst CChar) -> Bool -> IO (Ptr SDL_Process)
createProcessSafe :: PtrConst (PtrConst CChar) -> Bool -> IO (Ptr SDL_Process)
createProcessWithProperties :: SDL_PropertiesID -> IO (Ptr SDL_Process)
createProcessWithPropertiesSafe :: SDL_PropertiesID -> IO (Ptr SDL_Process)
getProcessProperties :: Ptr SDL_Process -> IO SDL_PropertiesID
getProcessPropertiesSafe :: Ptr SDL_Process -> IO SDL_PropertiesID
readProcess :: Ptr SDL_Process -> Ptr CSize -> Ptr CInt -> IO (Ptr Void)
readProcessSafe :: Ptr SDL_Process -> Ptr CSize -> Ptr CInt -> IO (Ptr Void)
getProcessInput :: Ptr SDL_Process -> IO (Ptr SDL_IOStream)
getProcessInputSafe :: Ptr SDL_Process -> IO (Ptr SDL_IOStream)
getProcessOutput :: Ptr SDL_Process -> IO (Ptr SDL_IOStream)
getProcessOutputSafe :: Ptr SDL_Process -> IO (Ptr SDL_IOStream)
killProcess :: Ptr SDL_Process -> Bool -> IO Bool
killProcessSafe :: Ptr SDL_Process -> Bool -> IO Bool
waitProcess :: Ptr SDL_Process -> Bool -> Ptr CInt -> IO Bool
waitProcessSafe :: Ptr SDL_Process -> Bool -> Ptr CInt -> IO Bool
destroyProcess :: Ptr SDL_Process -> IO ()
destroyProcessSafe :: Ptr SDL_Process -> IO ()

Documentation

module SDL3.Sys.Bindgen.Process

Function aliases

createProcess Source #

Arguments

:: PtrConst (PtrConst CChar)	`args` the path and arguments for the new process.
-> Bool	`pipe_stdio` true to create pipes to the process's standard input and from the process's standard output, false for the process to have no input and inherit the application's standard output.
-> IO (Ptr SDL_Process)

Create a new process.

The path to the executable is supplied in args[0]. args[1..N] are additional arguments passed on the command line of the new process, and the argument list should be terminated with a NULL, e.g.:

    const char *args[] = { "myprogram", "argument", NULL };

Setting pipe_stdio to true is equivalent to setting sDL_PROP_PROCESS_CREATE_STDIN_NUMBER and sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER to SDL_PROCESS_STDIO_APP, and will allow the use of readProcess or getProcessInput and getProcessOutput.

See createProcessWithProperties for more details.

Returns: the newly created and running process, or NULL if the process couldn't be created.
Thread safety: It is safe to call this function from any thread.
See also: createProcessWithProperties, getProcessProperties, readProcess, getProcessInput, getProcessOutput, killProcess, waitProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_CreateProcess. The safe flavor is createProcessSafe .
Scalars: The binding generation has mapped C scalars to native Haskell scalars for this function. Pointers and structs are untouched by this best-effort mapping. Higher-level bindings are expected to map structs and pointers as appropriate.
C declaration: SDL_CreateProcess, defined at SDL3/SDL_process.h 106:43

Since: 3.2.0

createProcessSafe Source #

Arguments

:: PtrConst (PtrConst CChar)	`args` the path and arguments for the new process.
-> Bool	`pipe_stdio` true to create pipes to the process's standard input and from the process's standard output, false for the process to have no input and inherit the application's standard output.
-> IO (Ptr SDL_Process)

Create a new process.

The path to the executable is supplied in args[0]. args[1..N] are additional arguments passed on the command line of the new process, and the argument list should be terminated with a NULL, e.g.:

    const char *args[] = { "myprogram", "argument", NULL };

Setting pipe_stdio to true is equivalent to setting sDL_PROP_PROCESS_CREATE_STDIN_NUMBER and sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER to SDL_PROCESS_STDIO_APP, and will allow the use of readProcess or getProcessInput and getProcessOutput.

See createProcessWithProperties for more details.

Returns: the newly created and running process, or NULL if the process couldn't be created.
Thread safety: It is safe to call this function from any thread.
See also: createProcessWithProperties, getProcessProperties, readProcess, getProcessInput, getProcessOutput, killProcess, waitProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_CreateProcess. The unsafe flavor is createProcess .
Scalars: The binding generation has mapped C scalars to native Haskell scalars for this function. Pointers and structs are untouched by this best-effort mapping. Higher-level bindings are expected to map structs and pointers as appropriate.
C declaration: SDL_CreateProcess, defined at SDL3/SDL_process.h 106:43

Since: 3.2.0

createProcessWithProperties Source #

Arguments

:: SDL_PropertiesID	`props` the properties to use.
-> IO (Ptr SDL_Process)

Create a new process with the specified properties.

These are the supported properties:

sDL_PROP_PROCESS_CREATE_ARGS_POINTER: an array of strings containing the program to run, any arguments, and a NULL pointer, e.g. const char *args[] = { "myprogram", "argument", NULL }. This is a required property.
sDL_PROP_PROCESS_CREATE_ENVIRONMENT_POINTER: an SDL_Environment pointer. If this property is set, it will be the entire environment for the process, otherwise the current environment is used.
sDL_PROP_PROCESS_CREATE_WORKING_DIRECTORY_STRING: a UTF-8 encoded string representing the working directory for the process, defaults to the current working directory.
sDL_PROP_PROCESS_CREATE_STDIN_NUMBER: an SDL_ProcessIO value describing where standard input for the process comes from, defaults to SDL_PROCESS_STDIO_NULL.
sDL_PROP_PROCESS_CREATE_STDIN_POINTER: an SDL_IOStream pointer used for standard input when sDL_PROP_PROCESS_CREATE_STDIN_NUMBER is set to SDL_PROCESS_STDIO_REDIRECT.
sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER: an SDL_ProcessIO value describing where standard output for the process goes to, defaults to SDL_PROCESS_STDIO_INHERITED.
sDL_PROP_PROCESS_CREATE_STDOUT_POINTER: an SDL_IOStream pointer used for standard output when sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER is set to SDL_PROCESS_STDIO_REDIRECT.
sDL_PROP_PROCESS_CREATE_STDERR_NUMBER: an SDL_ProcessIO value describing where standard error for the process goes to, defaults to SDL_PROCESS_STDIO_INHERITED.
sDL_PROP_PROCESS_CREATE_STDERR_POINTER: an SDL_IOStream pointer used for standard error when sDL_PROP_PROCESS_CREATE_STDERR_NUMBER is set to SDL_PROCESS_STDIO_REDIRECT.
sDL_PROP_PROCESS_CREATE_STDERR_TO_STDOUT_BOOLEAN: true if the error output of the process should be redirected into the standard output of the process. This property has no effect if sDL_PROP_PROCESS_CREATE_STDERR_NUMBER is set.
sDL_PROP_PROCESS_CREATE_BACKGROUND_BOOLEAN: true if the process should run in the background. In this case the default input and output is SDL_PROCESS_STDIO_NULL and the exitcode of the process is not available, and will always be 0.
sDL_PROP_PROCESS_CREATE_CMDLINE_STRING: a string containing the program to run and any parameters. This string is passed directly to CreateProcess on Windows, and does nothing on other platforms. This property is only important if you want to start programs that does non-standard command-line processing, and in most cases using sDL_PROP_PROCESS_CREATE_ARGS_POINTER is sufficient.

On POSIX platforms, wait() and waitpid(-1, ...) should not be called, and SIGCHLD should not be ignored or handled because those would prevent SDL from properly tracking the lifetime of the underlying process. You should use waitProcess instead.

Returns: the newly created and running process, or NULL if the process couldn't be created.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, getProcessProperties, readProcess, getProcessInput, getProcessOutput, killProcess, waitProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_CreateProcessWithProperties. The safe flavor is createProcessWithPropertiesSafe .
C declaration: SDL_CreateProcessWithProperties, defined at SDL3/SDL_process.h 227:43

Since: 3.2.0

createProcessWithPropertiesSafe Source #

Arguments

:: SDL_PropertiesID	`props` the properties to use.
-> IO (Ptr SDL_Process)

Create a new process with the specified properties.

These are the supported properties:

sDL_PROP_PROCESS_CREATE_ARGS_POINTER: an array of strings containing the program to run, any arguments, and a NULL pointer, e.g. const char *args[] = { "myprogram", "argument", NULL }. This is a required property.
sDL_PROP_PROCESS_CREATE_ENVIRONMENT_POINTER: an SDL_Environment pointer. If this property is set, it will be the entire environment for the process, otherwise the current environment is used.
sDL_PROP_PROCESS_CREATE_WORKING_DIRECTORY_STRING: a UTF-8 encoded string representing the working directory for the process, defaults to the current working directory.
sDL_PROP_PROCESS_CREATE_STDIN_NUMBER: an SDL_ProcessIO value describing where standard input for the process comes from, defaults to SDL_PROCESS_STDIO_NULL.
sDL_PROP_PROCESS_CREATE_STDIN_POINTER: an SDL_IOStream pointer used for standard input when sDL_PROP_PROCESS_CREATE_STDIN_NUMBER is set to SDL_PROCESS_STDIO_REDIRECT.
sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER: an SDL_ProcessIO value describing where standard output for the process goes to, defaults to SDL_PROCESS_STDIO_INHERITED.
sDL_PROP_PROCESS_CREATE_STDOUT_POINTER: an SDL_IOStream pointer used for standard output when sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER is set to SDL_PROCESS_STDIO_REDIRECT.
sDL_PROP_PROCESS_CREATE_STDERR_NUMBER: an SDL_ProcessIO value describing where standard error for the process goes to, defaults to SDL_PROCESS_STDIO_INHERITED.
sDL_PROP_PROCESS_CREATE_STDERR_POINTER: an SDL_IOStream pointer used for standard error when sDL_PROP_PROCESS_CREATE_STDERR_NUMBER is set to SDL_PROCESS_STDIO_REDIRECT.
sDL_PROP_PROCESS_CREATE_STDERR_TO_STDOUT_BOOLEAN: true if the error output of the process should be redirected into the standard output of the process. This property has no effect if sDL_PROP_PROCESS_CREATE_STDERR_NUMBER is set.
sDL_PROP_PROCESS_CREATE_BACKGROUND_BOOLEAN: true if the process should run in the background. In this case the default input and output is SDL_PROCESS_STDIO_NULL and the exitcode of the process is not available, and will always be 0.
sDL_PROP_PROCESS_CREATE_CMDLINE_STRING: a string containing the program to run and any parameters. This string is passed directly to CreateProcess on Windows, and does nothing on other platforms. This property is only important if you want to start programs that does non-standard command-line processing, and in most cases using sDL_PROP_PROCESS_CREATE_ARGS_POINTER is sufficient.

On POSIX platforms, wait() and waitpid(-1, ...) should not be called, and SIGCHLD should not be ignored or handled because those would prevent SDL from properly tracking the lifetime of the underlying process. You should use waitProcess instead.

Returns: the newly created and running process, or NULL if the process couldn't be created.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, getProcessProperties, readProcess, getProcessInput, getProcessOutput, killProcess, waitProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_CreateProcessWithProperties. The unsafe flavor is createProcessWithProperties .
C declaration: SDL_CreateProcessWithProperties, defined at SDL3/SDL_process.h 227:43

Since: 3.2.0

getProcessProperties Source #

Arguments

:: Ptr SDL_Process	`process` the process to query.
-> IO SDL_PropertiesID

Get the properties associated with a process.

The following read-only properties are provided by SDL:

sDL_PROP_PROCESS_PID_NUMBER: the process ID of the process.
sDL_PROP_PROCESS_STDIN_POINTER: an SDL_IOStream that can be used to write input to the process, if it was created with sDL_PROP_PROCESS_CREATE_STDIN_NUMBER set to SDL_PROCESS_STDIO_APP.
sDL_PROP_PROCESS_STDOUT_POINTER: a non-blocking SDL_IOStream that can be used to read output from the process, if it was created with sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER set to SDL_PROCESS_STDIO_APP.
sDL_PROP_PROCESS_STDERR_POINTER: a non-blocking SDL_IOStream that can be used to read error output from the process, if it was created with sDL_PROP_PROCESS_CREATE_STDERR_NUMBER set to SDL_PROCESS_STDIO_APP.
sDL_PROP_PROCESS_BACKGROUND_BOOLEAN: true if the process is running in the background.

Returns: a valid property ID on success or 0 on failure; call getError for more information.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, createProcessWithProperties

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_GetProcessProperties. The safe flavor is getProcessPropertiesSafe .
C declaration: SDL_GetProcessProperties, defined at SDL3/SDL_process.h 271:46

Since: 3.2.0

getProcessPropertiesSafe Source #

Arguments

:: Ptr SDL_Process	`process` the process to query.
-> IO SDL_PropertiesID

Get the properties associated with a process.

The following read-only properties are provided by SDL:

sDL_PROP_PROCESS_PID_NUMBER: the process ID of the process.
sDL_PROP_PROCESS_STDIN_POINTER: an SDL_IOStream that can be used to write input to the process, if it was created with sDL_PROP_PROCESS_CREATE_STDIN_NUMBER set to SDL_PROCESS_STDIO_APP.
sDL_PROP_PROCESS_STDOUT_POINTER: a non-blocking SDL_IOStream that can be used to read output from the process, if it was created with sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER set to SDL_PROCESS_STDIO_APP.
sDL_PROP_PROCESS_STDERR_POINTER: a non-blocking SDL_IOStream that can be used to read error output from the process, if it was created with sDL_PROP_PROCESS_CREATE_STDERR_NUMBER set to SDL_PROCESS_STDIO_APP.
sDL_PROP_PROCESS_BACKGROUND_BOOLEAN: true if the process is running in the background.

Returns: a valid property ID on success or 0 on failure; call getError for more information.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, createProcessWithProperties

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_GetProcessProperties. The unsafe flavor is getProcessProperties .
C declaration: SDL_GetProcessProperties, defined at SDL3/SDL_process.h 271:46

Since: 3.2.0

readProcess Source #

Arguments

:: Ptr SDL_Process	`process` The process to read.
-> Ptr CSize	`datasize` a pointer filled in with the number of bytes read, may be NULL.
-> Ptr CInt	`exitcode` a pointer filled in with the process exit code if the process has exited, may be NULL.
-> IO (Ptr Void)

Read all the output from a process.

If a process was created with I/O enabled, you can use this function to read the output. This function blocks until the process is complete, capturing all output, and providing the process exit code.

The data is allocated with a zero byte at the end (null terminated) for convenience. This extra byte is not included in the value reported via datasize.

The data should be freed with free.

Returns: the data or NULL on failure; call getError for more information.
Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_ReadProcess. The safe flavor is readProcessSafe : blocks until the process closes its output.
C declaration: SDL_ReadProcess, defined at SDL3/SDL_process.h 308:36

Since: 3.2.0

readProcessSafe Source #

Arguments

:: Ptr SDL_Process	`process` The process to read.
-> Ptr CSize	`datasize` a pointer filled in with the number of bytes read, may be NULL.
-> Ptr CInt	`exitcode` a pointer filled in with the process exit code if the process has exited, may be NULL.
-> IO (Ptr Void)

Read all the output from a process.

If a process was created with I/O enabled, you can use this function to read the output. This function blocks until the process is complete, capturing all output, and providing the process exit code.

The data is allocated with a zero byte at the end (null terminated) for convenience. This extra byte is not included in the value reported via datasize.

The data should be freed with free.

Returns: the data or NULL on failure; call getError for more information.
Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_ReadProcess. The unsafe flavor is readProcess : blocks until the process closes its output.
C declaration: SDL_ReadProcess, defined at SDL3/SDL_process.h 308:36

Since: 3.2.0

getProcessInput Source #

Arguments

:: Ptr SDL_Process	`process` The process to get the input stream for.
-> IO (Ptr SDL_IOStream)

Get the SDL_IOStream associated with process standard input.

The process must have been created with createProcess and pipe_stdio set to true, or with createProcessWithProperties and sDL_PROP_PROCESS_CREATE_STDIN_NUMBER set to SDL_PROCESS_STDIO_APP.

Writing to this stream can return less data than expected if the process hasn't read its input. It may be blocked waiting for its output to be read, if so you may need to call getProcessOutput and read the output in parallel with writing input.

Returns: the input stream or NULL on failure; call getError for more information.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, createProcessWithProperties, getProcessOutput

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_GetProcessInput. The safe flavor is getProcessInputSafe .
C declaration: SDL_GetProcessInput, defined at SDL3/SDL_process.h 334:44

Since: 3.2.0

getProcessInputSafe Source #

Arguments

:: Ptr SDL_Process	`process` The process to get the input stream for.
-> IO (Ptr SDL_IOStream)

Get the SDL_IOStream associated with process standard input.

The process must have been created with createProcess and pipe_stdio set to true, or with createProcessWithProperties and sDL_PROP_PROCESS_CREATE_STDIN_NUMBER set to SDL_PROCESS_STDIO_APP.

Writing to this stream can return less data than expected if the process hasn't read its input. It may be blocked waiting for its output to be read, if so you may need to call getProcessOutput and read the output in parallel with writing input.

Returns: the input stream or NULL on failure; call getError for more information.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, createProcessWithProperties, getProcessOutput

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_GetProcessInput. The unsafe flavor is getProcessInput .
C declaration: SDL_GetProcessInput, defined at SDL3/SDL_process.h 334:44

Since: 3.2.0

getProcessOutput Source #

Arguments

:: Ptr SDL_Process	`process` The process to get the output stream for.
-> IO (Ptr SDL_IOStream)

Get the SDL_IOStream associated with process standard output.

The process must have been created with createProcess and pipe_stdio set to true, or with createProcessWithProperties and sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER set to SDL_PROCESS_STDIO_APP.

Reading from this stream can return 0 with getIOStatus returning SDL_IO_STATUS_NOT_READY if no output is available yet.

Returns: the output stream or NULL on failure; call getError for more information.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, createProcessWithProperties, getProcessInput

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_GetProcessOutput. The safe flavor is getProcessOutputSafe .
C declaration: SDL_GetProcessOutput, defined at SDL3/SDL_process.h 358:44

Since: 3.2.0

getProcessOutputSafe Source #

Arguments

:: Ptr SDL_Process	`process` The process to get the output stream for.
-> IO (Ptr SDL_IOStream)

Get the SDL_IOStream associated with process standard output.

The process must have been created with createProcess and pipe_stdio set to true, or with createProcessWithProperties and sDL_PROP_PROCESS_CREATE_STDOUT_NUMBER set to SDL_PROCESS_STDIO_APP.

Reading from this stream can return 0 with getIOStatus returning SDL_IO_STATUS_NOT_READY if no output is available yet.

Returns: the output stream or NULL on failure; call getError for more information.
Thread safety: It is safe to call this function from any thread.
See also: createProcess, createProcessWithProperties, getProcessInput

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_GetProcessOutput. The unsafe flavor is getProcessOutput .
C declaration: SDL_GetProcessOutput, defined at SDL3/SDL_process.h 358:44

Since: 3.2.0

killProcess Source #

Arguments

:: Ptr SDL_Process	`process` The process to stop.
-> Bool	`force` true to terminate the process immediately, false to try to stop the process gracefully. In general you should try to stop the process gracefully first as terminating a process may leave it with half-written data or in some other unstable state.
-> IO Bool

Stop a process.

Returns: true on success or false on failure; call getError for more information.
Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, waitProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_KillProcess. The safe flavor is killProcessSafe .
Scalars: The binding generation has mapped C scalars to native Haskell scalars for this function. Pointers and structs are untouched by this best-effort mapping. Higher-level bindings are expected to map structs and pointers as appropriate.
C declaration: SDL_KillProcess, defined at SDL3/SDL_process.h 381:34

Since: 3.2.0

killProcessSafe Source #

Arguments

:: Ptr SDL_Process	`process` The process to stop.
-> Bool	`force` true to terminate the process immediately, false to try to stop the process gracefully. In general you should try to stop the process gracefully first as terminating a process may leave it with half-written data or in some other unstable state.
-> IO Bool

Stop a process.

Returns: true on success or false on failure; call getError for more information.
Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, waitProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_KillProcess. The unsafe flavor is killProcess .
Scalars: The binding generation has mapped C scalars to native Haskell scalars for this function. Pointers and structs are untouched by this best-effort mapping. Higher-level bindings are expected to map structs and pointers as appropriate.
C declaration: SDL_KillProcess, defined at SDL3/SDL_process.h 381:34

Since: 3.2.0

waitProcess Source #

Arguments

:: Ptr SDL_Process	`process` The process to wait for.
-> Bool	`block` If true, block until the process finishes; otherwise, report on the process' status.
-> Ptr CInt	`exitcode` a pointer filled in with the process exit code if the process has exited, may be NULL.
-> IO Bool

Wait for a process to finish.

This can be called multiple times to get the status of a process.

The exit code will be the exit code of the process if it terminates normally, a negative signal if it terminated due to a signal, or -255 otherwise. It will not be changed if the process is still running.

If you create a process with standard output piped to the application (pipe_stdio being true) then you should read all of the process output before calling waitProcess. If you don't do this the process might be blocked indefinitely waiting for output to be read and waitProcess will never return true;

Returns: true if the process exited, false otherwise.
Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, killProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_WaitProcess. The safe flavor is waitProcessSafe : blocks until the process exits.
Scalars: The binding generation has mapped C scalars to native Haskell scalars for this function. Pointers and structs are untouched by this best-effort mapping. Higher-level bindings are expected to map structs and pointers as appropriate.
C declaration: SDL_WaitProcess, defined at SDL3/SDL_process.h 414:34

Since: 3.2.0

waitProcessSafe Source #

Arguments

:: Ptr SDL_Process	`process` The process to wait for.
-> Bool	`block` If true, block until the process finishes; otherwise, report on the process' status.
-> Ptr CInt	`exitcode` a pointer filled in with the process exit code if the process has exited, may be NULL.
-> IO Bool

Wait for a process to finish.

This can be called multiple times to get the status of a process.

The exit code will be the exit code of the process if it terminates normally, a negative signal if it terminated due to a signal, or -255 otherwise. It will not be changed if the process is still running.

If you create a process with standard output piped to the application (pipe_stdio being true) then you should read all of the process output before calling waitProcess. If you don't do this the process might be blocked indefinitely waiting for output to be read and waitProcess will never return true;

Returns: true if the process exited, false otherwise.
Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, killProcess, destroyProcess

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_WaitProcess. The unsafe flavor is waitProcess : blocks until the process exits.
Scalars: The binding generation has mapped C scalars to native Haskell scalars for this function. Pointers and structs are untouched by this best-effort mapping. Higher-level bindings are expected to map structs and pointers as appropriate.
C declaration: SDL_WaitProcess, defined at SDL3/SDL_process.h 414:34

Since: 3.2.0

destroyProcess Source #

Arguments

:: Ptr SDL_Process	`process` The process object to destroy.
-> IO ()

Destroy a previously created process object.

Note that this does not stop the process, just destroys the SDL object used to track it. If you want to stop the process you should use killProcess.

Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, killProcess

`sdl3-bindgen-sys` notes

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FFI safety: Unsafe foreign import of SDL_DestroyProcess. The safe flavor is destroyProcessSafe .
C declaration: SDL_DestroyProcess, defined at SDL3/SDL_process.h 433:34

Since: 3.2.0

destroyProcessSafe Source #

Arguments

:: Ptr SDL_Process	`process` The process object to destroy.
-> IO ()

Destroy a previously created process object.

Note that this does not stop the process, just destroys the SDL object used to track it. If you want to stop the process you should use killProcess.

Thread safety: This function is not thread safe.
See also: createProcess, createProcessWithProperties, killProcess

`sdl3-bindgen-sys` notes

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FFI safety: Safe foreign import of SDL_DestroyProcess. The unsafe flavor is destroyProcess .
C declaration: SDL_DestroyProcess, defined at SDL3/SDL_process.h 433:34

Since: 3.2.0

FFI conventions

Documentation

Function aliases

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