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Use io_error_more on WASI #114709

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Oct 7, 2023
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Use io_error_more on WASI #114709

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115 changes: 92 additions & 23 deletions library/std/src/sys/wasi/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -82,31 +82,99 @@ pub fn is_interrupted(errno: i32) -> bool {
}

pub fn decode_error_kind(errno: i32) -> std_io::ErrorKind {
use std_io::ErrorKind::*;
if errno > u16::MAX as i32 || errno < 0 {
return Uncategorized;
use std_io::ErrorKind;

let Ok(errno) = u16::try_from(errno) else {
return ErrorKind::Uncategorized;
};

macro_rules! match_errno {
($($($errno:ident)|+ => $errkind:ident),*, _ => $wildcard:ident $(,)?) => {
match errno {
$(e if $(e == ::wasi::$errno.raw())||+ => ErrorKind::$errkind),*,
_ => ErrorKind::$wildcard,
}
};
}

match errno {
e if e == wasi::ERRNO_CONNREFUSED.raw().into() => ConnectionRefused,
e if e == wasi::ERRNO_CONNRESET.raw().into() => ConnectionReset,
e if e == wasi::ERRNO_PERM.raw().into() || e == wasi::ERRNO_ACCES.raw().into() => {
PermissionDenied
}
e if e == wasi::ERRNO_PIPE.raw().into() => BrokenPipe,
e if e == wasi::ERRNO_NOTCONN.raw().into() => NotConnected,
e if e == wasi::ERRNO_CONNABORTED.raw().into() => ConnectionAborted,
e if e == wasi::ERRNO_ADDRNOTAVAIL.raw().into() => AddrNotAvailable,
e if e == wasi::ERRNO_ADDRINUSE.raw().into() => AddrInUse,
e if e == wasi::ERRNO_NOENT.raw().into() => NotFound,
e if e == wasi::ERRNO_INTR.raw().into() => Interrupted,
e if e == wasi::ERRNO_INVAL.raw().into() => InvalidInput,
e if e == wasi::ERRNO_TIMEDOUT.raw().into() => TimedOut,
e if e == wasi::ERRNO_EXIST.raw().into() => AlreadyExists,
e if e == wasi::ERRNO_AGAIN.raw().into() => WouldBlock,
e if e == wasi::ERRNO_NOSYS.raw().into() => Unsupported,
e if e == wasi::ERRNO_NOMEM.raw().into() => OutOfMemory,
_ => Uncategorized,
match_errno! {
ERRNO_2BIG => ArgumentListTooLong,
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Can't strip the ERRNO_ prefix as 2BIG starts with a digit and doesn't match in ident.

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That's fine. Correctly naming the constant is acceptable, repeating everything else was not.

ERRNO_ACCES => PermissionDenied,
ERRNO_ADDRINUSE => AddrInUse,
ERRNO_ADDRNOTAVAIL => AddrNotAvailable,
ERRNO_AFNOSUPPORT => Unsupported,
ERRNO_AGAIN => WouldBlock,
// ALREADY => "connection already in progress",
// BADF => "bad file descriptor",
// BADMSG => "bad message",
ERRNO_BUSY => ResourceBusy,
// CANCELED => "operation canceled",
// CHILD => "no child processes",
ERRNO_CONNABORTED => ConnectionAborted,
ERRNO_CONNREFUSED => ConnectionRefused,
ERRNO_CONNRESET => ConnectionReset,
ERRNO_DEADLK => Deadlock,
// DESTADDRREQ => "destination address required",
ERRNO_DOM => InvalidInput,
// DQUOT => /* reserved */,
ERRNO_EXIST => AlreadyExists,
// FAULT => "bad address",
ERRNO_FBIG => FileTooLarge,
ERRNO_HOSTUNREACH => HostUnreachable,
// IDRM => "identifier removed",
// ILSEQ => "illegal byte sequence",
// INPROGRESS => "operation in progress",
ERRNO_INTR => Interrupted,
ERRNO_INVAL => InvalidInput,
ERRNO_IO => Uncategorized,
// ISCONN => "socket is connected",
ERRNO_ISDIR => IsADirectory,
ERRNO_LOOP => FilesystemLoop,
// MFILE => "file descriptor value too large",
ERRNO_MLINK => TooManyLinks,
// MSGSIZE => "message too large",
// MULTIHOP => /* reserved */,
ERRNO_NAMETOOLONG => InvalidFilename,
ERRNO_NETDOWN => NetworkDown,
// NETRESET => "connection aborted by network",
ERRNO_NETUNREACH => NetworkUnreachable,
// NFILE => "too many files open in system",
// NOBUFS => "no buffer space available",
ERRNO_NODEV => NotFound,
ERRNO_NOENT => NotFound,
// NOEXEC => "executable file format error",
// NOLCK => "no locks available",
// NOLINK => /* reserved */,
ERRNO_NOMEM => OutOfMemory,
// NOMSG => "no message of the desired type",
// NOPROTOOPT => "protocol not available",
ERRNO_NOSPC => StorageFull,
ERRNO_NOSYS => Unsupported,
ERRNO_NOTCONN => NotConnected,
ERRNO_NOTDIR => NotADirectory,
ERRNO_NOTEMPTY => DirectoryNotEmpty,
// NOTRECOVERABLE => "state not recoverable",
// NOTSOCK => "not a socket",
ERRNO_NOTSUP => Unsupported,
// NOTTY => "inappropriate I/O control operation",
ERRNO_NXIO => NotFound,
// OVERFLOW => "value too large to be stored in data type",
// OWNERDEAD => "previous owner died",
ERRNO_PERM => PermissionDenied,
ERRNO_PIPE => BrokenPipe,
// PROTO => "protocol error",
ERRNO_PROTONOSUPPORT => Unsupported,
// PROTOTYPE => "protocol wrong type for socket",
// RANGE => "result too large",
ERRNO_ROFS => ReadOnlyFilesystem,
ERRNO_SPIPE => NotSeekable,
ERRNO_SRCH => NotFound,
// STALE => /* reserved */,
ERRNO_TIMEDOUT => TimedOut,
ERRNO_TXTBSY => ResourceBusy,
ERRNO_XDEV => CrossesDevices,
ERRNO_NOTCAPABLE => PermissionDenied,
_ => Uncategorized,
}
}

Expand All @@ -124,6 +192,7 @@ pub fn hashmap_random_keys() -> (u64, u64) {
return ret;
}

#[inline]
fn err2io(err: wasi::Errno) -> std_io::Error {
std_io::Error::from_raw_os_error(err.raw().into())
}
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