Linux error numbers

Linux error numbers, straight from the horse's mouth.

#define EPERM            1      /* Operation not permitted */
#define ENOENT           2      /* No such file or directory */
#define ESRCH            3      /* No such process */
#define EINTR            4      /* Interrupted system call */
#define EIO              5      /* I/O error */
#define ENXIO            6      /* No such device or address */
#define E2BIG            7      /* Argument list too long */
#define ENOEXEC          8      /* Exec format error */
#define EBADF            9      /* Bad file number */
#define ECHILD          10      /* No child processes */
#define EAGAIN          11      /* Try again */
#define ENOMEM          12      /* Out of memory */
#define EACCES          13      /* Permission denied */
#define EFAULT          14      /* Bad address */
#define ENOTBLK         15      /* Block device required */
#define EBUSY           16      /* Device or resource busy */
#define EEXIST          17      /* File exists */
#define EXDEV           18      /* Cross-device link */
#define ENODEV          19      /* No such device */
#define ENOTDIR         20      /* Not a directory */
#define EISDIR          21      /* Is a directory */
#define EINVAL          22      /* Invalid argument */
#define ENFILE          23      /* File table overflow */
#define EMFILE          24      /* Too many open files */
#define ENOTTY          25      /* Not a typewriter */
#define ETXTBSY         26      /* Text file busy */
#define EFBIG           27      /* File too large */
#define ENOSPC          28      /* No space left on device */
#define ESPIPE          29      /* Illegal seek */
#define EROFS           30      /* Read-only file system */
#define EMLINK          31      /* Too many links */
#define EPIPE           32      /* Broken pipe */
#define EDOM            33      /* Math argument out of domain of func */
#define ERANGE          34      /* Math result not representable */
#define EDEADLK         35      /* Resource deadlock would occur */
#define ENAMETOOLONG    36      /* File name too long */
#define ENOLCK          37      /* No record locks available */
#define ENOSYS          38      /* Invalid system call number */
#define ENOTEMPTY       39      /* Directory not empty */
#define ELOOP           40      /* Too many symbolic links encountered */
#define EWOULDBLOCK     EAGAIN  /* Operation would block */
#define ENOMSG          42      /* No message of desired type */
#define EIDRM           43      /* Identifier removed */
#define ECHRNG          44      /* Channel number out of range */
#define EL2NSYNC        45      /* Level 2 not synchronized */
#define EL3HLT          46      /* Level 3 halted */
#define EL3RST          47      /* Level 3 reset */
#define ELNRNG          48      /* Link number out of range */
#define EUNATCH         49      /* Protocol driver not attached */
#define ENOCSI          50      /* No CSI structure available */
#define EL2HLT          51      /* Level 2 halted */
#define EBADE           52      /* Invalid exchange */
#define EBADR           53      /* Invalid request descriptor */
#define EXFULL          54      /* Exchange full */
#define ENOANO          55      /* No anode */
#define EBADRQC         56      /* Invalid request code */
#define EBADSLT         57      /* Invalid slot */
#define EDEADLOCK       EDEADLK
#define EBFONT          59      /* Bad font file format */
#define ENOSTR          60      /* Device not a stream */
#define ENODATA         61      /* No data available */
#define ETIME           62      /* Timer expired */
#define ENOSR           63      /* Out of streams resources */
#define ENONET          64      /* Machine is not on the network */
#define ENOPKG          65      /* Package not installed */
#define EREMOTE         66      /* Object is remote */
#define ENOLINK         67      /* Link has been severed */
#define EADV            68      /* Advertise error */
#define ESRMNT          69      /* Srmount error */
#define ECOMM           70      /* Communication error on send */
#define EPROTO          71      /* Protocol error */
#define EMULTIHOP       72      /* Multihop attempted */
#define EDOTDOT         73      /* RFS specific error */
#define EBADMSG         74      /* Not a data message */
#define EOVERFLOW       75      /* Value too large for defined data type */
#define ENOTUNIQ        76      /* Name not unique on network */
#define EBADFD          77      /* File descriptor in bad state */
#define EREMCHG         78      /* Remote address changed */
#define ELIBACC         79      /* Can not access a needed shared library */
#define ELIBBAD         80      /* Accessing a corrupted shared library */
#define ELIBSCN         81      /* .lib section in a.out corrupted */
#define ELIBMAX         82      /* Attempting to link in too many shared libraries */
#define ELIBEXEC        83      /* Cannot exec a shared library directly */
#define EILSEQ          84      /* Illegal byte sequence */
#define ERESTART        85      /* Interrupted system call should be restarted */
#define ESTRPIPE        86      /* Streams pipe error */
#define EUSERS          87      /* Too many users */
#define ENOTSOCK        88      /* Socket operation on non-socket */
#define EDESTADDRREQ    89      /* Destination address required */
#define EMSGSIZE        90      /* Message too long */
#define EPROTOTYPE      91      /* Protocol wrong type for socket */
#define ENOPROTOOPT     92      /* Protocol not available */
#define EPROTONOSUPPORT 93      /* Protocol not supported */
#define ESOCKTNOSUPPORT 94      /* Socket type not supported */
#define EOPNOTSUPP      95      /* Operation not supported on transport endpoint */
#define EPFNOSUPPORT    96      /* Protocol family not supported */
#define EAFNOSUPPORT    97      /* Address family not supported by protocol */
#define EADDRINUSE      98      /* Address already in use */
#define EADDRNOTAVAIL   99      /* Cannot assign requested address */
#define ENETDOWN        100     /* Network is down */
#define ENETUNREACH     101     /* Network is unreachable */
#define ENETRESET       102     /* Network dropped connection because of reset */
#define ECONNABORTED    103     /* Software caused connection abort */
#define ECONNRESET      104     /* Connection reset by peer */
#define ENOBUFS         105     /* No buffer space available */
#define EISCONN         106     /* Transport endpoint is already connected */
#define ENOTCONN        107     /* Transport endpoint is not connected */
#define ESHUTDOWN       108     /* Cannot send after transport endpoint shutdown */
#define ETOOMANYREFS    109     /* Too many references: cannot splice */
#define ETIMEDOUT       110     /* Connection timed out */
#define ECONNREFUSED    111     /* Connection refused */
#define EHOSTDOWN       112     /* Host is down */
#define EHOSTUNREACH    113     /* No route to host */
#define EALREADY        114     /* Operation already in progress */
#define EINPROGRESS     115     /* Operation now in progress */
#define ESTALE          116     /* Stale file handle */
#define EUCLEAN         117     /* Structure needs cleaning */
#define ENOTNAM         118     /* Not a XENIX named type file */
#define ENAVAIL         119     /* No XENIX semaphores available */
#define EISNAM          120     /* Is a named type file */
#define EREMOTEIO       121     /* Remote I/O error */
#define EDQUOT          122     /* Quota exceeded */
#define ENOMEDIUM       123     /* No medium found */
#define EMEDIUMTYPE     124     /* Wrong medium type */
#define ECANCELED       125     /* Operation Canceled */
#define ENOKEY          126     /* Required key not available */
#define EKEYEXPIRED     127     /* Key has expired */
#define EKEYREVOKED     128     /* Key has been revoked */
#define EKEYREJECTED    129     /* Key was rejected by service */
#define EOWNERDEAD      130     /* Owner died */
#define ENOTRECOVERABLE 131     /* State not recoverable */
#define ERFKILL         132     /* Operation not possible due to RF-kill */
#define EHWPOISON       133     /* Memory page has hardware error */

The following is a complete list of the errors and their names as given in <sys/errno.h>.

 0 Undefined error: 0.  Not used.

 1 EPERM Operation not permitted.  An attempt was made to perform an oper-
         ation limited to processes with appropriate privileges or to the
         owner of a file or other resources.

 2 ENOENT No such file or directory.  A component of a specified pathname
         did not exist, or the pathname was an empty string.

 3 ESRCH No such process.  No process could be found corresponding to that
         specified by the given process ID.

 4 EINTR Interrupted system call.  An asynchronous signal (such as SIGINT
         or SIGQUIT) was caught by the process during the execution of an
         interruptible function.  If the signal handler performs a normal
         return, the interrupted system call will seem to have returned
         the error condition.

 5 EIO Input/output error.  Some physical input or output error occurred.
         This error will not be reported until a subsequent operation on
         the same file descriptor and may be lost (over written) by any
         subsequent errors.

 6 ENXIO Device not configured.  Input or output on a special file
         referred to a device that did not exist, or made a request beyond
         the limits of the device.  This error may also occur when, for
         example, a tape drive is not online or no disk pack is loaded on
         a drive.

 7 E2BIG Argument list too long.  The number of bytes used for the argu-
         ment and environment list of the new process exceeded the current
         limit (NCARGS in <sys/param.h>).

 8 ENOEXEC Exec format error.  A request was made to execute a file that,
         although it has the appropriate permissions, was not in the for-
         mat required for an executable file.

 9 EBADF Bad file descriptor.  A file descriptor argument was out of
         range, referred to no open file, or a read (write) request was
         made to a file that was only open for writing (reading).

 10 ECHILD No child processes.  A wait(2) or waitpid(2) function was exe-
         cuted by a process that had no existing or unwaited-for child
         processes.

 11 EDEADLK Resource deadlock avoided.  An attempt was made to lock a sys-
         tem resource that would have resulted in a deadlock situation.

 12 ENOMEM Cannot allocate memory.  The new process image required more
         memory than was allowed by the hardware or by system-imposed mem-
         ory management constraints.  A lack of swap space is normally
         temporary; however, a lack of core is not.  Soft limits may be
         increased to their corresponding hard limits.

 13 EACCES Permission denied.  An attempt was made to access a file in a
         way forbidden by its file access permissions.

 14 EFAULT Bad address.  The system detected an invalid address in
         attempting to use an argument of a call.

 15 ENOTBLK Block device required.  A block device operation was attempted
         on a non-block device or file.

 16 EBUSY Device busy.  An attempt to use a system resource which was in
         use at the time in a manner which would have conflicted with the
         request.

 17 EEXIST File exists.  An existing file was mentioned in an inappropri-
         ate context, for instance, as the new link name in a link(2) sys-
         tem call.

 18 EXDEV Cross-device link.  A hard link to a file on another file system
         was attempted.

 19 ENODEV Operation not supported by device.  An attempt was made to
         apply an inappropriate function to a device, for example, trying
         to read a write-only device such as a printer.

 20 ENOTDIR Not a directory.  A component of the specified pathname
         existed, but it was not a directory, when a directory was
         expected.

 21 EISDIR Is a directory.  An attempt was made to open a directory with
         write mode specified.

 22 EINVAL Invalid argument.  Some invalid argument was supplied.  (For
         example, specifying an undefined signal to a signal(3) function
         or a kill(2) system call).

 23 ENFILE Too many open files in system.  Maximum number of file descrip-
         tors allowable on the system has been reached and a requests for
         an open cannot be satisfied until at least one has been closed.

 24 EMFILE Too many open files.  (As released, the limit on the number of
         open files per process is 64.)  The getdtablesize(2) system call
         will obtain the current limit.

 25 ENOTTY Inappropriate ioctl for device.  A control function (see
         ioctl(2)) was attempted for a file or special device for which
         the operation was inappropriate.

 26 ETXTBSY Text file busy.  The new process was a pure procedure (shared
         text) file which was open for writing by another process, or
         while the pure procedure file was being executed an open(2) call
         requested write access.

 27 EFBIG File too large.  The size of a file exceeded the maximum.

 28 ENOSPC No space left on device.  A write(2) to an ordinary file, the
         creation of a directory or symbolic link, or the creation of a
         directory entry failed because no more disk blocks were available
         on the file system, or the allocation of an inode for a newly
         created file failed because no more inodes were available on the
         file system.

 29 ESPIPE Illegal seek.  An lseek(2) system call was issued on a socket,
         pipe or FIFO.

 30 EROFS Read-only file system.  An attempt was made to modify a file or
         directory on a file system that was read-only at the time.

 31 EMLINK Too many links.  Maximum allowable hard links to a single file
         has been exceeded (limit of 32767 hard links per file).

 32 EPIPE Broken pipe.  A write on a pipe, socket or FIFO for which there
         is no process to read the data.

 33 EDOM Numerical argument out of domain.  A numerical input argument was
         outside the defined domain of the mathematical function.

 34 ERANGE Result too large.  A numerical result of the function was too
         large to fit in the available space (perhaps exceeded precision).

 35 EAGAIN Resource temporarily unavailable.  This is a temporary condi-
         tion and later calls to the same routine may complete normally.

 36 EINPROGRESS Operation now in progress.  An operation that takes a long
         time to complete (such as a connect(2)) was attempted on a non-
         blocking object (see fcntl(2)).

 37 EALREADY Operation already in progress.  An operation was attempted on
         a non-blocking object that already had an operation in progress.

 38 ENOTSOCK Socket operation on non-socket.  Self-explanatory.

 39 EDESTADDRREQ Destination address required.  A required address was
         omitted from an operation on a socket.

 40 EMSGSIZE Message too long.  A message sent on a socket was larger than
         the internal message buffer or some other network limit.

 41 EPROTOTYPE Protocol wrong type for socket.  A protocol was specified
         that does not support the semantics of the socket type requested.
         For example, you cannot use the ARPA Internet UDP protocol with
         type SOCK_STREAM.

 42 ENOPROTOOPT Protocol not available.  A bad option or level was speci-
         fied in a getsockopt(2) or setsockopt(2) call.

 43 EPROTONOSUPPORT Protocol not supported.  The protocol has not been
         configured into the system or no implementation for it exists.

 44 ESOCKTNOSUPPORT Socket type not supported.  The support for the socket
         type has not been configured into the system or no implementation
         for it exists.

 45 EOPNOTSUPP Operation not supported.  The attempted operation is not
         supported for the type of object referenced.  Usually this occurs
         when a file descriptor refers to a file or socket that cannot
         support this operation, for example, trying to accept a connec-
         tion on a datagram socket.

 46 EPFNOSUPPORT Protocol family not supported.  The protocol family has
         not been configured into the system or no implementation for it
         exists.

 47 EAFNOSUPPORT Address family not supported by protocol family.  An
         address incompatible with the requested protocol was used.  For
         example, you should not necessarily expect to be able to use NS
         addresses with ARPA Internet protocols.

 48 EADDRINUSE Address already in use.  Only one usage of each address is
         normally permitted.

 49 EADDRNOTAVAIL Cannot assign requested address.  Normally results from
         an attempt to create a socket with an address not on this
         machine.

 50 ENETDOWN Network is down.  A socket operation encountered a dead net-
         work.

 51 ENETUNREACH Network is unreachable.  A socket operation was attempted
         to an unreachable network.

 52 ENETRESET Network dropped connection on reset.  The host you were con-
         nected to crashed and rebooted.

 53 ECONNABORTED Software caused connection abort.  A connection abort was
         caused internal to your host machine.

 54 ECONNRESET Connection reset by peer.  A connection was forcibly closed
         by a peer.  This normally results from a loss of the connection
         on the remote socket due to a timeout or a reboot.

 55 ENOBUFS No buffer space available.  An operation on a socket or pipe
         was not performed because the system lacked sufficient buffer
         space or because a queue was full.

 56 EISCONN Socket is already connected.  A connect(2) request was made on
         an already connected socket; or, a sendto(2) or sendmsg(2)
         request on a connected socket specified a destination when
         already connected.

 57 ENOTCONN Socket is not connected.  An request to send or receive data
         was disallowed because the socket was not connected and (when
         sending on a datagram socket) no address was supplied.

 58 ESHUTDOWN Cannot send after socket shutdown.  A request to send data
         was disallowed because the socket had already been shut down with
         a previous shutdown(2) call.

 60 ETIMEDOUT Operation timed out.  A connect(2) or send(2) request failed
         because the connected party did not properly respond after a
         period of time.  (The timeout period is dependent on the communi-
         cation protocol.)

 61 ECONNREFUSED Connection refused.  No connection could be made because
         the target machine actively refused it.  This usually results
         from trying to connect to a service that is inactive on the for-
         eign host.

 62 ELOOP Too many levels of symbolic links.  A path name lookup involved
         more than 32 (MAXSYMLINKS) symbolic links.

 63 ENAMETOOLONG File name too long.  A component of a path name exceeded
         {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX}
         characters.  (See also the description of _PC_NO_TRUNC in
         pathconf(2).)

 64 EHOSTDOWN Host is down.  A socket operation failed because the desti-
         nation host was down.

 65 EHOSTUNREACH No route to host.  A socket operation was attempted to an
         unreachable host.

 66 ENOTEMPTY Directory not empty.  A directory with entries other than
         `.' and `..' was supplied to a remove directory or rename call.

 67 EPROCLIM Too many processes.

 68 EUSERS Too many users.  The quota system ran out of table entries.

 69 EDQUOT Disc quota exceeded.  A write(2) to an ordinary file, the cre-
         ation of a directory or symbolic link, or the creation of a
         directory entry failed because the user's quota of disk blocks
         was exhausted, or the allocation of an inode for a newly created
         file failed because the user's quota of inodes was exhausted.

 70 ESTALE Stale NFS file handle.  An attempt was made to access an open
         file (on an NFS file system) which is now unavailable as refer-
         enced by the file descriptor.  This may indicate the file was
         deleted on the NFS server or some other catastrophic event
         occurred.

 72 EBADRPC RPC struct is bad.  Exchange of RPC information was unsuccess-
         ful.

 73 ERPCMISMATCH RPC version wrong.  The version of RPC on the remote peer
         is not compatible with the local version.

 74 EPROGUNAVAIL RPC prog. not avail.  The requested program is not regis-
         tered on the remote host.

 75 EPROGMISMATCH Program version wrong.  The requested version of the
         program is not available on the remote host (RPC).

 76 EPROCUNAVAIL Bad procedure for program.  An RPC call was attempted for
         a procedure which does not exist in the remote program.

 77 ENOLCK No locks available.  A system-imposed limit on the number of
         simultaneous file locks was reached.

 78 ENOSYS Function not implemented.  Attempted a system call that is not
         available on this system.

 79 EFTYPE Inappropriate file type or format.  The file was the wrong type
         for the operation, or a data file had the wrong format.

 80 EAUTH Authentication error.  Attempted to use an invalid authentica-
         tion ticket to mount a NFS file system.

 81 ENEEDAUTH Need authenticator.  An authentication ticket must be
         obtained before the given NFS file system may be mounted.

 82 EIDRM Identifier removed.  An IPC identifier was removed while the
         current process was waiting on it.

 83 ENOMSG No message of desired type.  An IPC message queue does not con-
         tain a message of the desired type, or a message catalog does not
         contain the requested message.

 84 EOVERFLOW Value too large to be stored in data type.  A numerical
         result of the function was too large to be stored in the caller
         provided space.

 85 ECANCELED Operation canceled.  The scheduled operation was canceled.

 86 EILSEQ Illegal byte sequence.  While decoding a multibyte character
         the function came along an invalid or an incomplete sequence of
         bytes or the given wide character is invalid.

 87 ENOATTR Attribute not found.  The specified extended attribute does
         not exist.

 88 EDOOFUS Programming error.  A function or API is being abused in a way
         which could only be detected at run-time.