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Added
std/oserrors
for OS error reporting (nim-lang#19390)
* Added 'std/oserrors' for OS error reporting * add a simple test * New code should not support -d:useWinAnsi anymore thanks to @Araq
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# | ||
# | ||
# Nim's Runtime Library | ||
# (c) Copyright 2022 Nim contributors | ||
# | ||
# See the file "copying.txt", included in this | ||
# distribution, for details about the copyright. | ||
# | ||
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## The `std/oserrors` module implements OS error reporting. | ||
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type | ||
OSErrorCode* = distinct int32 ## Specifies an OS Error Code. | ||
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when not defined(nimscript): | ||
when defined(windows): | ||
import winlean | ||
else: | ||
var errno {.importc, header: "<errno.h>".}: cint | ||
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proc c_strerror(errnum: cint): cstring {. | ||
importc: "strerror", header: "<string.h>".} | ||
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proc `==`*(err1, err2: OSErrorCode): bool {.borrow.} | ||
proc `$`*(err: OSErrorCode): string {.borrow.} | ||
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proc osErrorMsg*(errorCode: OSErrorCode): string = | ||
## Converts an OS error code into a human readable string. | ||
## | ||
## The error code can be retrieved using the `osLastError proc`_. | ||
## | ||
## If conversion fails, or `errorCode` is `0` then `""` will be | ||
## returned. | ||
## | ||
## See also: | ||
## * `raiseOSError proc`_ | ||
## * `osLastError proc`_ | ||
runnableExamples: | ||
when defined(linux): | ||
assert osErrorMsg(OSErrorCode(0)) == "" | ||
assert osErrorMsg(OSErrorCode(1)) == "Operation not permitted" | ||
assert osErrorMsg(OSErrorCode(2)) == "No such file or directory" | ||
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result = "" | ||
when defined(nimscript): | ||
discard | ||
elif defined(windows): | ||
if errorCode != OSErrorCode(0'i32): | ||
var msgbuf: WideCString | ||
if formatMessageW(0x00000100 or 0x00001000 or 0x00000200, | ||
nil, errorCode.int32, 0, addr(msgbuf), 0, nil) != 0'i32: | ||
result = $msgbuf | ||
if msgbuf != nil: localFree(cast[pointer](msgbuf)) | ||
else: | ||
if errorCode != OSErrorCode(0'i32): | ||
result = $c_strerror(errorCode.int32) | ||
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proc newOSError*( | ||
errorCode: OSErrorCode, additionalInfo = "" | ||
): owned(ref OSError) {.noinline.} = | ||
## Creates a new `OSError exception <system.html#OSError>`_. | ||
## | ||
## The `errorCode` will determine the | ||
## message, `osErrorMsg proc`_ will be used | ||
## to get this message. | ||
## | ||
## The error code can be retrieved using the `osLastError proc`_. | ||
## | ||
## If the error code is `0` or an error message could not be retrieved, | ||
## the message `unknown OS error` will be used. | ||
## | ||
## See also: | ||
## * `osErrorMsg proc`_ | ||
## * `osLastError proc`_ | ||
var e: owned(ref OSError); new(e) | ||
e.errorCode = errorCode.int32 | ||
e.msg = osErrorMsg(errorCode) | ||
if additionalInfo.len > 0: | ||
if e.msg.len > 0 and e.msg[^1] != '\n': e.msg.add '\n' | ||
e.msg.add "Additional info: " | ||
e.msg.add additionalInfo | ||
# don't add trailing `.` etc, which negatively impacts "jump to file" in IDEs. | ||
if e.msg == "": | ||
e.msg = "unknown OS error" | ||
return e | ||
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proc raiseOSError*(errorCode: OSErrorCode, additionalInfo = "") {.noinline.} = | ||
## Raises an `OSError exception <system.html#OSError>`_. | ||
## | ||
## Read the description of the `newOSError proc`_ to learn | ||
## how the exception object is created. | ||
raise newOSError(errorCode, additionalInfo) | ||
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{.push stackTrace:off.} | ||
proc osLastError*(): OSErrorCode {.sideEffect.} = | ||
## Retrieves the last operating system error code. | ||
## | ||
## This procedure is useful in the event when an OS call fails. In that case | ||
## this procedure will return the error code describing the reason why the | ||
## OS call failed. The `OSErrorMsg` procedure can then be used to convert | ||
## this code into a string. | ||
## | ||
## .. warning:: The behaviour of this procedure varies between Windows and POSIX systems. | ||
## On Windows some OS calls can reset the error code to `0` causing this | ||
## procedure to return `0`. It is therefore advised to call this procedure | ||
## immediately after an OS call fails. On POSIX systems this is not a problem. | ||
## | ||
## See also: | ||
## * `osErrorMsg proc`_ | ||
## * `raiseOSError proc`_ | ||
when defined(nimscript): | ||
discard | ||
elif defined(windows): | ||
result = cast[OSErrorCode](getLastError()) | ||
else: | ||
result = OSErrorCode(errno) | ||
{.pop.} |
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discard """ | ||
action: compile | ||
""" | ||
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import std/oserrors | ||
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let x1 = osLastError() | ||
raiseOSError(x1) | ||
echo osErrorMsg(x1) |