OS¶

Usage

use OS;

or

import OS;

Submodules

POSIX

The OS module provides definitions matching operating system interfaces.

This module provides Chapel declarations for the constants, types, and functions defined by various operating systems’ programmatic interfaces. It is not complete for any operating system, but does define those things that have been needed so far in implementing other Chapel modules and user programs. It is expected to grow as needed. In all respects (naming, capitalization, types, semantics) the symbols defined here should match their corresponding operating system definitions to the extent Chapel can do so. For documentation on these symbols, please see the operating system manual pages.

type errorCode¶

A type storing an error code or an error message. An errorCode can be compared using == or != to a CTypes.c_int or to another errorCode. An errorCode can be cast to or from a CTypes.c_int. It can be assigned the value of a CTypes.c_int or another errorCode. In addition, errorCode can be checked directly in an if statement like so:

var err: errorCode;
if err then writeln("err contains an error, ie err != 0");
else writeln("err does not contain an error; err == 0");

The default intent for a formal of type errorCode is const in.

The default value of the errorCode type is undefined.

class SystemError: Error¶

SystemError is a base class for Errors.Error s generated from errorCode. It provides factory methods to create different subtypes based on the errorCode that is passed.

proc init(err: errorCode, details: string = "")¶: Construct a SystemError with a specific error code and optional extra details.

override proc message()¶: Provides a formatted string output for SystemError, generated from the internal err and the details string.

proc createSystemError(err: errorCode, details: string = ""): SystemError¶

Return the matching SystemError subtype for a given errorCode, with an optional string containing extra details.

Arguments

err – the errorCode to generate from
details – extra information to include with the error

proc createSystemError(err: int, details: string = "")

Return the matching SystemError subtype for a given error number, with an optional string containing extra details.

Arguments

err – the number to generate from
details – extra information to include with the error

class BlockingIoError: SystemError¶: BlockingIoError is the subclass of SystemError corresponding to EAGAIN, EALREADY, EWOULDBLOCK, and EINPROGRESS.

class ChildProcessError: SystemError¶: ChildProcessError is the subclass of SystemError corresponding to ECHILD.

class ConnectionError: SystemError¶: ConnectionError is the subclass of SystemError that serves as the base class for all system errors regarding connections.

class BrokenPipeError: ConnectionError¶: BrokenPipeError is the subclass of ConnectionError corresponding to EPIPE

class ConnectionAbortedError: ConnectionError¶: ConnectionAbortedError is the subclass of ConnectionError corresponding to ECONNABORTED.

class ConnectionRefusedError: ConnectionError¶: ConnectionRefusedError is the subclass of ConnectionError corresponding to ECONNREFUSED.

class ConnectionResetError: ConnectionError¶: ConnectionResetError is the subclass of ConnectionError corresponding to ECONNRESET.

class FileExistsError: SystemError¶: FileExistsError is the subclass of SystemError corresponding to EEXIST.

class FileNotFoundError: SystemError¶: FileNotFoundError is the subclass of SystemError corresponding to ENOENT.

class InterruptedError: SystemError¶: InterruptedError is the subclass of SystemError corresponding to EINTR.

class IsADirectoryError: SystemError¶: IsADirectoryError is the subclass of SystemError corresponding to EISDIR.

class NotADirectoryError: SystemError¶: NotADirectoryError is the subclass of SystemError corresponding to ENOTDIR.

class PermissionError: SystemError¶: PermissionError is the subclass of SystemError corresponding to EACCES and EPERM.

class ProcessLookupError: SystemError¶: ProcessLookupError is the subclass of SystemError corresponding to ESRCH.

class TimeoutError: SystemError¶: TimeoutError is the subclass of SystemError corresponding to ETIMEDOUT.

class IoError: SystemError¶: IoError is the subclass of SystemError corresponding to EIO.

class EofError: Error¶: EofError is the the Chapel-specific error corresponding to encountering end-of-file.

class UnexpectedEofError: Error¶

UnexpectedEofError is the Chapel-specific error corresponding to encountering end-of-file before the requested amount of input could be read.

This error can also occur on some writing operations when a fileWriter’s range has been specified, and the write exceeds the valid range.

class BadFormatError: Error¶: BadFormatError is the Chapel-specific error corresponding to incorrectly-formatted input.

class InsufficientCapacityError: IoError¶: InsufficientCapacityError is a subclass of IoError indicating that an IO operation required more storage than was provided

proc ioerror(error: errorCode, msg: string, path: string, offset: int(64)) throws¶

Create and throw an Errors.Error if an error occurred, formatting a useful message based on the provided arguments. Do nothing if the error argument does not indicate an error occurred.

Arguments

error – the error code
msg – extra information to include in the thrown error
path – optionally, a path to include in the thrown error
offset – optionally, an offset to include in the thrown error

Throws

Error – A subtype is thrown when the error argument indicates an error occurred

proc ioerror(errstr: string, msg: string, path: string, offset: int(64)) throws

Create and throw an IoError and include a formatted message based on the provided arguments.

Arguments

errstr – the error string
msg – extra information to print after the error description
path – a path to print out that is related to the error
offset – an offset to print out that is related to the error

Throws

IoError – always throws an IoError

proc errorToString(error: errorCode): string¶

Convert a errorCode code to a human-readable string describing the error.

Arguments: error – the error code
Returns: a string describing the error