基于 UNIX 的环境中的 TCP/IP 用户，下表列出了某些最常见的错误原因码 (errno)。完整的错误列表可以在文件 /usr/include/sys/errno.h 中找到 Errno。针对每一种操作系统给出了errno 号码。

Linux Socket Errno错误代码列表

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