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table-errno-values lists the constants provided by GLIBC on the authors Intel GNU/Linux system.

Table: GLIBC values for errno

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

Many systems provide other error values as well, and older systems may not have all the errors just listed.