List of OS error codes

The following document contains a partial list of Operating System (OS) error codes that can be reported when running QuestDB and brief descriptions for them.

Where to find error codes

QuestDB includes OS error codes into the [<code>] part of the exception message written to the error logs:

io.questdb.cairo.CairoException: [24] could not open read-only [file=/root/.questdb/db/cpu/service.k]

The above message reports error code 24 which is "Too many open files" on Linux.

Some error log messages may also include errno=<code> key/value pair:

2022-02-01T13:40:10.636014Z E i.q.c.l.t.LineTcpConnectionContext [8655] could not process line data [table=test_table, msg=could not mmap [size=248, offset=0, fd=1766, memUsed=314809894008, fileLen=8192], errno=12]

The above message reports error code 12 which is "Out of memory" on Linux.

Linux error codes

Error number	Error name	Description
1	EPERM	Operation not permitted.
2	ENOENT	No such file or directory.
3	ESRCH	No such process.
4	EINTR	Interrupted system call.
5	EIO	I/O error.
6	ENXIO	No such device or address.
7	E2BIG	Argument list too long.
8	ENOEXEC	Exec format error.
9	EBADF	Bad file number.
10	ECHILD	No child processes.
11	EAGAIN	Try again.
12	ENOMEM	Out of memory.
13	EACCES	Permission denied.
14	EFAULT	Bad address.
15	ENOTBLK	Block device required.
16	EBUSY	Device or resource busy.
17	EEXIST	File exists.
18	EXDEV	Cross-device link.
19	ENODEV	No such device.
20	ENOTDIR	Not a directory.
21	EISDIR	Is a directory.
22	EINVAL	Invalid argument.
23	ENFILE	File table overflow.
24	EMFILE	Too many open files.
25	ENOTTY	Not a typewriter.
26	ETXTBSY	Text file busy.
27	EFBIG	File too large.
28	ENOSPC	No space left on device.
29	ESPIPE	Illegal seek.
30	EROFS	Read-only file system.
31	EMLINK	Too many links.
32	EPIPE	Broken pipe.
33	EDOM	Math argument out of domain of func.
34	ERANGE	Math result not representable.
35	EDEADLK	Resource deadlock would occur.
36	ENAMETOOLONG	File name too long.
37	ENOLCK	No record locks available.
38	ENOSYS	Function not implemented.
39	ENOTEMPTY	Directory not empty.
40	ELOOP	Too many symbolic links encountered.
42	ENOMSG	No message of desired type.
43	EIDRM	Identifier removed.
44	ECHRNG	Channel number out of range.
45	EL2NSYNC	Level 2 not synchronized.
46	EL3HLT	Level 3 halted.
47	EL3RST	Level 3 reset.
48	ELNRNG	Link number out of range.
49	EUNATCH	Protocol driver not attached.
50	ENOCSI	No CSI structure available.
51	EL2HLT	Level 2 halted.
52	EBADE	Invalid exchange.
53	EBADR	Invalid request descriptor.
54	EXFULL	Exchange full.
55	ENOANO	No anode.
56	EBADRQC	Invalid request code.
57	EBADSLT	Invalid slot.
59	EBFONT	Bad font file format.
60	ENOSTR	Device not a stream.
61	ENODATA	No data available.
62	ETIME	Timer expired.
63	ENOSR	Out of streams resources.
64	ENONET	Machine is not on the network.
65	ENOPKG	Package not installed.
66	EREMOTE	Object is remote.
67	ENOLINK	Link has been severed.
68	EADV	Advertise error.
69	ESRMNT	Srmount error.
70	ECOMM	Communication error on send.
71	EPROTO	Protocol error.
72	EMULTIHOP	Multihop attempted.
73	EDOTDOT	RFS specific error.
74	EBADMSG	Not a data message.
75	EOVERFLOW	Value too large for defined data type.
76	ENOTUNIQ	Name not unique on network.
77	EBADFD	File descriptor in bad state.
78	EREMCHG	Remote address changed.
79	ELIBACC	Can not access a needed shared library.
80	ELIBBAD	Accessing a corrupted shared library.
81	ELIBSCN	.lib section in a.out corrupted.
82	ELIBMAX	Attempting to link in too many shared libraries.
83	ELIBEXEC	Cannot exec a shared library directly.
84	EILSEQ	Illegal byte sequence.
85	ERESTART	Interrupted system call should be restarted.
86	ESTRPIPE	Streams pipe error.
87	EUSERS	Too many users.
88	ENOTSOCK	Socket operation on non-socket.
89	EDESTADDRREQ	Destination address required.
90	EMSGSIZE	Message too long.
91	EPROTOTYPE	Protocol wrong type for socket.
92	ENOPROTOOPT	Protocol not available.
93	EPROTONOSUPPORT	Protocol not supported.
94	ESOCKTNOSUPPORT	Socket type not supported.
95	EOPNOTSUPP	Operation not supported on transport endpoint.
96	EPFNOSUPPORT	Protocol family not supported.
97	EAFNOSUPPORT	Address family not supported by protocol.
98	EADDRINUSE	Address already in use.
99	EADDRNOTAVAIL	Cannot assign requested address.
100	ENETDOWN	Network is down.
101	ENETUNREACH	Network is unreachable.
102	ENETRESET	Network dropped connection because of reset.
103	ECONNABORTED	Software caused connection abort.
104	ECONNRESET	Connection reset by peer.
105	ENOBUFS	No buffer space available.
106	EISCONN	Transport endpoint is already connected.
107	ENOTCONN	Transport endpoint is not connected.
108	ESHUTDOWN	Cannot send after transport endpoint shutdown.
109	ETOOMANYREFS	Too many references: cannot splice.
110	ETIMEDOUT	Connection timed out.
111	ECONNREFUSED	Connection refused.
112	EHOSTDOWN	Host is down.
113	EHOSTUNREACH	No route to host.
114	EALREADY	Operation already in progress.
115	EINPROGRESS	Operation now in progress.
116	ESTALE	Stale NFS file handle.
117	EUCLEAN	Structure needs cleaning.
118	ENOTNAM	Not a XENIX named type file.
119	ENAVAIL	No XENIX semaphores available.
120	EISNAM	Is a named type file.
121	EREMOTEIO	Remote I/O error.
122	EDQUOT	Quota exceeded.
123	ENOMEDIUM	No medium found.
124	EMEDIUMTYPE	Wrong medium type.
125	ECANCELED	Operation Canceled.
126	ENOKEY	Required key not available.
127	EKEYEXPIRED	Key has expired.
128	EKEYREVOKED	Key has been revoked.
129	EKEYREJECTED	Key was rejected by service.
130	EOWNERDEAD	Owner died.
131	ENOTRECOVERABLE	State not recoverable.

Windows error codes

A complete list of Windows error codes may be found here.

Error number	Error name	Description
1	ERROR_INVALID_FUNCTION	Incorrect function.
2	ERROR_FILE_NOT_FOUND	The system cannot find the file specified.
3	ERROR_PATH_NOT_FOUND	The system cannot find the path specified.
4	ERROR_TOO_MANY_OPEN_FILES	The system cannot open the file.
5	ERROR_ACCESS_DENIED	Access is denied.
6	ERROR_INVALID_HANDLE	The handle is invalid.
7	ERROR_ARENA_TRASHED	The storage control blocks were destroyed.
8	ERROR_NOT_ENOUGH_MEMORY	Not enough storage is available to process this command.
9	ERROR_INVALID_BLOCK	The storage control block address is invalid.
10	ERROR_BAD_ENVIRONMENT	The environment is incorrect.
11	ERROR_BAD_FORMAT	An attempt was made to load a program with an incorrect format.
12	ERROR_INVALID_ACCESS	The access code is invalid.
13	ERROR_INVALID_DATA	The data is invalid.
14	ERROR_OUTOFMEMORY	Not enough storage is available to complete this operation.
15	ERROR_INVALID_DRIVE	The system cannot find the drive specified.
16	ERROR_CURRENT_DIRECTORY	The directory cannot be removed.
17	ERROR_NOT_SAME_DEVICE	The system cannot move the file to a different disk drive.
18	ERROR_NO_MORE_FILES	There are no more files.
19	ERROR_WRITE_PROTECT	The media is write protected.
20	ERROR_BAD_UNIT	The system cannot find the device specified.
21	ERROR_NOT_READY	The device is not ready.
22	ERROR_BAD_COMMAND	The device does not recognize the command.
23	ERROR_CRC	Data error (cyclic redundancy check).
24	ERROR_BAD_LENGTH	The program issued a command but the command length is incorrect.
25	ERROR_SEEK	The drive cannot locate a specific area or track on the disk.
26	ERROR_NOT_DOS_DISK	The specified disk or diskette cannot be accessed.
27	ERROR_SECTOR_NOT_FOUND	The drive cannot find the sector requested.
28	ERROR_OUT_OF_PAPER	The printer is out of paper.
29	ERROR_WRITE_FAULT	The system cannot write to the specified device.
30	ERROR_READ_FAULT	The system cannot read from the specified device.
31	ERROR_GEN_FAILURE	A device attached to the system is not functioning.
32	ERROR_SHARING_VIOLATION	The process cannot access the file because it is being used by another process.
33	ERROR_LOCK_VIOLATION	The process cannot access the file because another process has locked a portion of the file.
34	ERROR_WRONG_DISK	The wrong diskette is in the drive. Insert %2 (Volume Serial Number: %3) into drive %1.
36	ERROR_SHARING_BUFFER_EXCEEDED	Too many files opened for sharing.
38	ERROR_HANDLE_EOF	Reached the end of the file.
39	ERROR_HANDLE_DISK_FULL	The disk is full.
87	ERROR_INVALID_PARAMETER	The parameter is incorrect.
112	ERROR_DISK_FULL	The disk is full.
123	ERROR_INVALID_NAME	The file name, directory name, or volume label syntax is incorrect.
1450	ERROR_NO_SYSTEM_RESOURCES	Insufficient system resources exist to complete the requested service.

MacOS error codes

Error number	Error name	Description
0	Base	Undefined error: 0
1	EPERM	Operation not permitted
2	ENOENT	No such file or directory
3	ESRCH	No such process
4	EINTR	Interrupted system call
5	EIO	Input/output error
6	ENXIO	Device not configured
7	E2BIG	Argument list too long
8	ENOEXEC	Exec format error
9	EBADF	Bad file descriptor
10	ECHILD	No child processes
11	EDEADLK	Resource deadlock avoided
12	ENOMEM	Cannot allocate memory
13	EACCES	Permission denied
14	EFAULT	Bad address
15	ENOTBLK	Block device required
16	EBUSY	Device busy
17	EEXIST	File exists
18	EXDEV	Cross-device link
19	ENODEV	Operation not supported by device
20	ENOTDIR	Not a directory
21	EISDIR	Is a directory
22	EINVAL	Invalid argument
23	ENFILE	Too many open files in system
24	EMFILE	Too many open files
25	ENOTTY	Inappropriate ioctl for device
26	ETXTBSY	Text file busy
27	EFBIG	File too large
28	ENOSPC	No space left on device
29	ESPIPE	Illegal seek
30	EROFS	Read-only file system
31	EMLINK	Too many links
32	EPIPE	Broken pipe
33	EDOM	Numerical argument out of domain
34	ERANGE	Result too large
35	EAGAIN	Resource temporarily unavailable
36	EINPROGRESS	Operation now in progress
37	EALREADY	Operation already in progress
38	ENOTSOCK	Socket operation on non-socket
39	EDESTADDRREQ	Destination address required
40	EMSGSIZE	Message too long
41	EPROTOTYPE	Protocol wrong type for socket
42	ENOPROTOOPT	Protocol not available
43	EPROTONOSUPPORT	Protocol not supported
44	ESOCKTNOSUPPORT	Socket type not supported
45	ENOTSUP	Operation not supported
46	EPFNOSUPPORT	Protocol family not supported
47	EAFNOSUPPORT	Address family not supported by protocol family
48	EADDRINUSE	Address already in use
49	EADDRNOTAVAIL	Can’t assign requested address
50	ENETDOWN	Network is down
51	ENETUNREACH	Network is unreachable
52	ENETRESET	Network dropped connection on reset
53	ECONNABORTED	Software caused connection abort
54	ECONNRESET	Connection reset by peer
55	ENOBUFS	No buffer space available
56	EISCONN	Socket is already connected
57	ENOTCONN	Socket is not connected
58	ESHUTDOWN	Can’t send after socket shutdown
59	ETOOMANYREFS	Too many references: can’t splice
60	ETIMEDOUT	Operation timed out
61	ECONNREFUSED	Connection refused
62	ELOOP	Too many levels of symbolic links
63	ENAMETOOLONG	File name too long
64	EHOSTDOWN	Host is down
65	EHOSTUNREACH	No route to host
66	ENOTEMPTY	Directory not empty
67	EPROCLIM	Too many processes
68	EUSERS	Too many users
69	EDQUOT	Disc quota exceeded
70	ESTALE	Stale NFS file handle
71	EREMOTE	Too many levels of remote in path
72	EBADRPC	RPC struct is bad
73	ERPCMISMATCH	RPC version wrong
74	EPROGUNAVAIL	RPC prog. not avail
75	EPROGMISMATCH	Program version wrong
76	EPROCUNAVAIL	Bad procedure for program
77	ENOLCK	No locks available
78	ENOSYS	Function not implemented
79	EFTYPE	Inappropriate file type or format
80	EAUTH	Authentication error
81	ENEEDAUTH	Need authenticator
82	EPWROFF	Device power is off
83	EDEVERR	Device error
84	EOVERFLOW	Value too large to be stored in data type
85	EBADEXEC	Bad executable
86	EBADARCH	Bad CPU type in executable
87	ESHLIBVERS	Shared library version mismatch
88	EBADMACHO	Malformed Macho file
89	ECANCELED	Operation canceled
90	EIDRM	Identifier removed
91	ENOMSG	No message of desired type
92	EILSEQ	Illegal byte sequence
93	ENOATTR	Attribute not found
94	EBADMSG	Bad message
95	EMULTIHOP	EMULTIHOP (Reserved)
96	ENODATA	No message available on STREAM
97	ENOLINK	ENOLINK (Reserved)
98	ENOSR	No STREAM resources
99	ENOSTR	Not a STREAM
100	EPROTO	Protocol error
101	ETIME	STREAM ioctl timeout
102	EOPNOTSUPP	Operation not supported on socket
103	ENOPOLICY	Policy not found
104	ENOTRECOVERABLE	State not recoverable
105	EOWNERDEAD	Previous owner died
106	EQFULL	Interface output queue is full