Merge pull request #542 from stlankes/errno

add missing function to get the latest error number

hermit-abi/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "hermit-abi"
-version = "0.3.8"
+version = "0.3.9"
 authors = ["Stefan Lankes"]
 license = "MIT OR Apache-2.0"
 edition = "2021"

hermit-abi/src/errno.rs

@@ -395,3 +395,138 @@ pub const ERFKILL: i32 = 132;
 
 /// Robust mutexes: Memory page has hardware error
 pub const EHWPOISON: i32 = 133;
+
+/// Converts an error number to a corresponding error string
+pub fn error_string(errno: i32) -> &'static str {
+	match errno {
+		0 => "Operation successful",
+		EPERM => "Operation not permitted",
+		ENOENT => "No such file or directory",
+		ESRCH => "No such process",
+		EINTR => "Interrupted system call",
+		EIO => "I/O error",
+		ENXIO => "No such device or address",
+		E2BIG => "Argument list too long",
+		ENOEXEC => "Exec format error",
+		EBADF => "Bad file number",
+		ECHILD => "No child processes",
+		EAGAIN => "Try again",
+		ENOMEM => "Out of memory",
+		EACCES => "Permission denied",
+		EFAULT => "Bad address",
+		ENOTBLK => "Block device required",
+		EBUSY => "Device or resource busy",
+		EEXIST => "File exists",
+		EXDEV => "Cross-device link",
+		ENODEV => "No such device",
+		ENOTDIR => "Not a directory",
+		EISDIR => "Is a directory",
+		EINVAL => "Invalid argument",
+		ENFILE => "File table overflow",
+		EMFILE => "Too many open files",
+		ENOTTY => "Not a typewriter",
+		ETXTBSY => "Text file busy",
+		EFBIG => "File too large",
+		ENOSPC => "No space left on device",
+		ESPIPE => "Illegal seek",
+		EROFS => "Read-only file system",
+		EMLINK => "Too many links",
+		EPIPE => "Broken pipe",
+		EDOM => "Math argument out of domain of func",
+		ERANGE => "Math result not representable",
+		EDEADLK => "Resource deadlock would occur",
+		ENAMETOOLONG => "File name too long",
+		ENOLCK => "No record locks available",
+		ENOSYS => "Function not implemented",
+		ENOTEMPTY => "Directory not empty",
+		ELOOP => "Too many symbolic links encountered",
+		ENOMSG => "No message of desired type",
+		EIDRM => "Identifier removed",
+		ECHRNG => "Channel number out of range",
+		EL2NSYNC => "Level 2 not synchronized",
+		EL3HLT => "Level 3 halted",
+		EL3RST => "Level 3 reset",
+		ELNRNG => "Link number out of range",
+		EUNATCH => "Protocol driver not attached",
+		ENOCSI => "No CSI structure available",
+		EL2HLT => "Level 2 halted",
+		EBADE => "Invalid exchange",
+		EBADR => "Invalid request descriptor",
+		EXFULL => "Exchange full",
+		ENOANO => "No anode",
+		EBADRQC => "Invalid request code",
+		EBADSLT => "Invalid slot",
+		EBFONT => "Bad font file format",
+		ENOSTR => "Device not a stream",
+		ENODATA => "No data available",
+		ETIME => "Timer expired",
+		ENOSR => "Out of streams resources",
+		ENONET => "Machine is not on the network",
+		ENOPKG => "Package not installed",
+		EREMOTE => "Object is remote",
+		ENOLINK => "Link has been severed",
+		EADV => "Advertise error",
+		ESRMNT => "Srmount error",
+		ECOMM => "Communication error on send",
+		EPROTO => "Protocol error",
+		EMULTIHOP => "Multihop attempted",
+		EDOTDOT => "RFS specific error",
+		EBADMSG => "Not a data message",
+		EOVERFLOW => "Value too large for defined data type",
+		ENOTUNIQ => "Name not unique on network",
+		EBADFD => "File descriptor in bad state",
+		EREMCHG => "Remote address changed",
+		ELIBACC => "Can not access a needed shared library",
+		ELIBBAD => "Accessing a corrupted shared library",
+		ELIBSCN => "Lib section in a.out corrupted",
+		ELIBMAX => "Attempting to link in too many shared libraries",
+		ELIBEXEC => "Cannot exec a shared library directly",
+		EILSEQ => "Illegal byte sequence",
+		ERESTART => "Interrupted system call should be restarted",
+		ESTRPIPE => "Streams pipe error",
+		EUSERS => "Too many users",
+		ENOTSOCK => "Socket operation on non-socket",
+		EDESTADDRREQ => "Destination address required",
+		EMSGSIZE => "Message too long",
+		EPROTOTYPE => "Protocol wrong type for socket",
+		ENOPROTOOPT => "Protocol not available",
+		EPROTONOSUPPORT => "Protocol not supported",
+		ESOCKTNOSUPPORT => "Socket type not supported",
+		EOPNOTSUPP => "Operation not supported on transport endpoint",
+		EPFNOSUPPORT => "Protocol family not supported",
+		EAFNOSUPPORT => "Address family not supported by protocol",
+		EADDRINUSE => "Address already in use",
+		EADDRNOTAVAIL => "Cannot assign requested address",
+		ENETDOWN => "Network is down",
+		ENETUNREACH => "Network is unreachable",
+		ENETRESET => "Network dropped connection because of reset",
+		ECONNABORTED => "Software caused connection abort",
+		ECONNRESET => "Connection reset by peer",
+		ENOBUFS => "No buffer space available",
+		EISCONN => "Transport endpoint is already connected",
+		ENOTCONN => "Transport endpoint is not connected",
+		ESHUTDOWN => "Cannot send after transport endpoint shutdown",
+		ETOOMANYREFS => "Too many references: cannot splice",
+		ETIMEDOUT => "Connection timed out",
+		ECONNREFUSED => "Connection refused",
+		EHOSTDOWN => "Host is down",
+		EHOSTUNREACH => "No route to host",
+		EALREADY => "Operation already in progress",
+		EINPROGRESS => "Operation now in progress",
+		ESTALE => "Stale file handle",
+		EUCLEAN => "Structure needs cleaning",
+		EDQUOT => "Quota exceeded",
+		ENOMEDIUM => "No medium found",
+		EMEDIUMTYPE => "Wrong medium type",
+		ECANCELED => "Operation Canceled",
+		ENOKEY => "Required key not available",
+		EKEYEXPIRED => "Key has expired",
+		EKEYREVOKED => "Key has been revoked",
+		EKEYREJECTED => "Key was rejected by service",
+		EOWNERDEAD => "Robust mutexes: Owner died",
+		ENOTRECOVERABLE => "Robust mutexes: State not recoverable",
+		ERFKILL => "Robust mutexes: Operation not possible due to RF-kill",
+		EHWPOISON => "Robust mutexes: Memory page has hardware error",
+		_ => "Unknown error",
+	}
+}

hermit-abi/src/lib.rs

@@ -337,6 +337,10 @@ pub const S_IFMT: u32 = 0xF000;
 
 // sysmbols, which are part of the library operating system
 extern "C" {
+	/// Get the last error number from the thread local storage
+	#[link_name = "sys_get_errno"]
+	pub fn get_errno() -> i32;
+
 	/// If the value at address matches the expected value, park the current thread until it is either
 	/// woken up with [`futex_wake`] (returns 0) or an optional timeout elapses (returns -ETIMEDOUT).
 	///