# List of OS error codes List of OS error codes that may be reported by QuestDB running on Linux and Windows. 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. If instead you come across a QuestDB error code (e.g. `ER001`), refer to the [QuestDB Error Codes](/docs/troubleshooting/error-codes) page. ## Where to find error codes QuestDB includes OS error codes into the `[]` 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=` 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](https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes). | 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 memory 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 |