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process.gr
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process.gr
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/**
* Utilities for accessing functionality and information about the Grain program's process.
*
* This includes things like accessing environment variables and sending signals.
*
* @example from "wasi/process" include Sys/process
*/
module Process
from "runtime/unsafe/wasmi32" include WasmI32
use WasmI32.{ (+), (*), (>>), (>>>), (&), (==), (!=), (<) }
from "runtime/unsafe/memory" include Memory
from "runtime/wasi" include Wasi
from "runtime/dataStructures" include DataStructures
use DataStructures.{ tagSimpleNumber, allocateArray, allocateString }
/**
* Signals that can be sent to the host system.
*/
provide enum Signal {
/**
* Hangup.
*/
HUP,
/**
* Terminate interrupt signal.
*/
INT,
/**
* Terminal quit signal.
*/
QUIT,
/**
* Illegal instruction.
*/
ILL,
/**
* Trace/breakpoint trap.
*/
TRAP,
/**
* Process abort signal.
*/
ABRT,
/**
* Access to an undefined portion of a memory object.
*/
BUS,
/**
* Erroneous arithmetic operation.
*/
FPE,
/**
* Kill.
*/
KILL,
/**
* User-defined signal 1.
*/
USR1,
/**
* Invalid memory reference.
*/
SEGV,
/**
* User-defined signal 2.
*/
USR2,
/**
* Write on a pipe with no one to read it.
*/
PIPE,
/**
* Alarm clock.
*/
ALRM,
/**
* Termination signal.
*/
TERM,
/**
* Child process terminated, stopped, or continued.
*/
CHLD,
/**
* Continue executing, if stopped.
*/
CONT,
/**
* Stop executing.
*/
STOP,
/**
* Terminal stop signal.
*/
TSTP,
/**
* Background process attempting read.
*/
TTIN,
/**
* Background process attempting write.
*/
TTOU,
/**
* High bandwidth data is available at a socket.
*/
URG,
/**
* CPU time limit exceeded.
*/
XCPU,
/**
* File size limit exceeded.
*/
XFSZ,
/**
* Virtual timer expired.
*/
VTALRM,
PROF,
WINCH,
POLL,
PWR,
/**
* Bad system call.
*/
SYS,
}
/**
* Access command line arguments.
*
* @returns `Ok(args)` of an array containing positional string arguments to the process if successful or `Err(exception)` otherwise
*/
@unsafe
provide let argv = () => {
let argcPtr = Memory.malloc(8n)
let argvBufSizePtr = argcPtr + 4n
let err = Wasi.args_sizes_get(argcPtr, argvBufSizePtr)
if (err != Wasi._ESUCCESS) {
Memory.free(argcPtr)
return Err(Wasi.SystemError(tagSimpleNumber(err)))
}
let argc = WasmI32.load(argcPtr, 0n)
Memory.free(argcPtr)
let argsLength = argc * 4n
let arr = allocateArray(argc)
if (WasmI32.eqz(argsLength)) {
return Ok(WasmI32.toGrain(arr): Array<String>)
}
let argvBufSize = WasmI32.load(argvBufSizePtr, 0n)
let argvPtr = Memory.malloc(argc * 4n)
let argvBufPtr = Memory.malloc(argvBufSize)
let err = Wasi.args_get(argvPtr, argvBufPtr)
if (err != Wasi._ESUCCESS) {
Memory.free(argvPtr)
Memory.free(argvBufPtr)
return Err(Wasi.SystemError(tagSimpleNumber(err)))
}
for (let mut i = 0n; i < argsLength; i += 4n) {
let strPtr = WasmI32.load(argvPtr + i, 0n)
let mut strLength = 0n
while (WasmI32.load8U(strPtr + strLength, 0n) != 0n) {
strLength += 1n
}
let grainStrPtr = allocateString(strLength)
Memory.copy(grainStrPtr + 8n, strPtr, strLength)
WasmI32.store(arr + i, grainStrPtr, 8n)
}
Memory.free(argvPtr)
Memory.free(argvBufPtr)
return Ok(WasmI32.toGrain(arr): Array<String>)
}
/**
* Access environment variables.
*
* @returns `Ok(vars)` of an array containing environment variables supplied to the process if successful or `Err(exception)` otherwise
*/
@unsafe
provide let env = () => {
let envcPtr = Memory.malloc(8n)
let envvBufSizePtr = envcPtr + 4n
let err = Wasi.environ_sizes_get(envcPtr, envvBufSizePtr)
if (err != Wasi._ESUCCESS) {
Memory.free(envcPtr)
return Err(Wasi.SystemError(tagSimpleNumber(err)))
}
let envc = WasmI32.load(envcPtr, 0n)
let envvBufSize = WasmI32.load(envvBufSizePtr, 0n)
if (WasmI32.eqz(envc)) {
Memory.free(envcPtr)
return Ok([>]: Array<String>)
}
let envvPtr = Memory.malloc(envc * 4n)
let envvBufPtr = Memory.malloc(envvBufSize)
let err = Wasi.environ_get(envvPtr, envvBufPtr)
if (err != Wasi._ESUCCESS) {
Memory.free(envcPtr)
Memory.free(envvPtr)
Memory.free(envvBufPtr)
return Err(Wasi.SystemError(tagSimpleNumber(err)))
}
let arr = allocateArray(envc)
let envsLength = envc * 4n
for (let mut i = 0n; i < envsLength; i += 4n) {
let strPtr = WasmI32.load(envvPtr + i, 0n)
let mut strLength = 0n
while (WasmI32.load8U(strPtr + strLength, 0n) != 0n) {
strLength += 1n
}
let grainStrPtr = allocateString(strLength)
Memory.copy(grainStrPtr + 8n, strPtr, strLength)
WasmI32.store(arr + i, grainStrPtr, 8n)
}
Memory.free(envcPtr)
Memory.free(envvPtr)
Memory.free(envvBufPtr)
return Ok(WasmI32.toGrain(arr): Array<String>)
}
/**
* Terminate the process normally.
*
* @param code: The value to exit with. An exit code of 0 is considered normal, with other values having meaning depending on the platform
* @returns `Err(exception)` if unsuccessful. Will not actually return a value if successful, as the process has ended
*/
@unsafe
provide let exit = (code: Number) => {
let mut code = WasmI32.fromGrain(code)
if ((code & 1n) == 0n) {
return Err(InvalidArgument("Invalid exit code"))
}
code = code >> 1n
Wasi.proc_exit(code)
// Never actually hit because it exited
return Ok(void)
}
/**
* Send a signal to the process of the calling thread.
*
* @param signal: The signal to send
* @returns `Ok(void)` if successful or `Err(exception)` otherwise
*/
@unsafe
provide let sigRaise = (signal: Signal) => {
let signal = WasmI32.fromGrain(signal)
let signal = WasmI32.load(signal, 12n) >> 1n
let err = Wasi.proc_raise(signal)
if (err != Wasi._ESUCCESS) {
return Err(Wasi.SystemError(tagSimpleNumber(err)))
}
return Ok(void)
}
/**
* Yield execution to the calling thread.
*
* @returns `Ok(void)` if successful or `Err(exception)` otherwise
*/
@unsafe
provide let schedYield = () => {
let err = Wasi.sched_yield()
if (err != Wasi._ESUCCESS) {
return Err(Wasi.SystemError(tagSimpleNumber(err)))
}
return Ok(void)
}