ubuntu connect 是 errno 为111 115 101 22 错误分析

22：参数错误，比如ip地址不合法，没有目标端口等

101：网络不可达，比如不能ping通

111：链接被拒绝，比如目标关闭链接等

115：当链接设置为非阻塞时，目标没有及时应答，返回此错误，socket可以继续使用

 

附录：Linux的错误码表（errno table)

_ 124 EMEDIUMTYPE_ Wrong medium type

_ 123 ENOMEDIUM__ No medium found

_ 122 EDQUOT___  Disk quota exceeded

_ 121 EREMOTEIO__ Remote I/O error

_ 120 EISNAM___  Is a named type file

_ 119 ENAVAIL___ No XENIX semaphores available

_ 118 ENOTNAM___ Not a XENIX named type file

_ 117 EUCLEAN___ Structure needs cleaning

_ 116 ESTALE___  Stale NFS file handle

_ 115 EINPROGRESS  +Operation now in progress

_ 114 EALREADY__  Operation already in progress

_ 113 EHOSTUNREACH  No route to host

_ 112 EHOSTDOWN__ Host is down

_ 111 ECONNREFUSED  Connection refused

_ 110 ETIMEDOUT_  +Connection timed out

_ 109 ETOOMANYREFS  Too many references: cannot splice

_ 108 ESHUTDOWN__ Cannot send after transport endpoint shutdown

_ 107 ENOTCONN__  Transport endpoint is not connected

_ 106 EISCONN___ Transport endpoint is already connected

_ 105 ENOBUFS___ No buffer space available

_ 104 ECONNRESET_  Connection reset by peer

_ 103 ECONNABORTED  Software caused connection abort

_ 102 ENETRESET__ Network dropped connection on reset

_ 101 ENETUNREACH_ Network is unreachable

_ 100 ENETDOWN__  Network is down

_  99 EADDRNOTAVAIL Cannot assign requested address

_  98 EADDRINUSE_  Address already in use

_  97 EAFNOSUPPORT  Address family not supported by protocol

_  96 EPFNOSUPPORT  Protocol family not supported

_  95 EOPNOTSUPP_  Operation not supported

_  94 ESOCKTNOSUPPORT Socket type not supported

_  93 EPROTONOSUPPORT Protocol not supported

_  92 ENOPROTOOPT_ Protocol not available

_  91 EPROTOTYPE_  Protocol wrong type for socket

_  90 EMSGSIZE__ +Message too long

_  89 EDESTADDRREQ  Destination address required

_  88 ENOTSOCK__  Socket operation on non-socket

_  87 EUSERS___  Too many users

_  86 ESTRPIPE__  Streams pipe error

_  85 ERESTART__  Interrupted system call should be restarted

_  84 EILSEQ___  Invalid or incomplete multibyte or wide character

_  83 ELIBEXEC__  Cannot exec a shared library directly

_  82 ELIBMAX___ Attempting to link in too many shared libraries

_  81 ELIBSCN___ .lib section in a.out corrupted

_  80 ELIBBAD___ Accessing a corrupted shared library

_  79 ELIBACC___ Can not access a needed shared library

_  78 EREMCHG___ Remote address changed

_  77 EBADFD___  File descriptor in bad state

_  76 ENOTUNIQ__  Name not unique on network

_  75 EOVERFLOW__ Value too large for defined data type

_  74 EBADMSG__  +Bad message

_  73 EDOTDOT___ RFS specific error

_  72 EMULTIHOP__ Multihop attempted

_  71 EPROTO___  Protocol error

_  70 ECOMM____ Communication error on send

_  69 ESRMNT___  Srmount error

_  68 EADV____  Advertise error

_  67 ENOLINK___ Link has been severed

_  66 EREMOTE___ Object is remote

_  65 ENOPKG___  Package not installed

_  64 ENONET___  Machine is not on the network

_  63 ENOSR____ Out of streams resources

_  62 ETIME____ Timer expired

_  61 ENODATA___ No data available

_  60 ENOSTR___  Device not a stream

_  59 EBFONT___  Bad font file format

_  57 EBADSLT___ Invalid slot

_  56 EBADRQC___ Invalid request code

_  55 ENOANO___  No anode

_  54 EXFULL___  Exchange full

_  53 EBADR____ Invalid request descriptor

_  52 EBADE____ Invalid exchange

_  51 EL2HLT___  Level 2 halted

_  50 ENOCSI___  No CSI structure available

_  49 EUNATCH___ Protocol driver not attached

_  48 ELNRNG___  Link number out of range

_  47 EL3RST___  Level 3 reset

_  46 EL3HLT___  Level 3 halted

_  45 EL2NSYNC__  Level 2 not synchronized

_  44 ECHRNG___  Channel number out of range

_  43 EIDRM____ Identifier removed

_  42 ENOMSG___  No message of desired type

_  40 ELOOP____ Too many levels of symbolic links

_  39 ENOTEMPTY_  +Directory not empty

_  38 ENOSYS___ +Function not implemented

_  37 ENOLCK___ +No locks available

_  36 ENAMETOOLONG +File name too long

_  35 EDEADLK__  +Resource deadlock avoided

_  34 ERANGE___ +Numerical result out of range

_  33 EDOM____ +Numerical argument out of domain

_  32 EPIPE___  +Broken pipe

_  31 EMLINK___ +Too many links

_  30 EROFS___  +Read-only file system

_  29 ESPIPE___ +Illegal seek

_  28 ENOSPC___ +No space left on device

_  27 EFBIG___  +File too large

_  26 ETXTBSY___ Text file busy

_  25 ENOTTY___ +Inappropriate ioctl for device

_  24 EMFILE___ +Too many open files

_  23 ENFILE___ +Too many open files in system

_  22 EINVAL___ +Invalid argument

_  21 EISDIR___ +Is a directory

_  20 ENOTDIR__  +Not a directory

_  19 ENODEV___ +No such device

_  18 EXDEV___  +Invalid cross-device link

_  17 EEXIST___ +File exists

_  16 EBUSY___  +Device or resource busy

_  15 ENOTBLK___ Block device required

_  14 EFAULT___ +Bad address

_  13 EACCES___ +Permission denied

_  12 ENOMEM___ +Cannot allocate memory

_  11 EAGAIN___ +Resource temporarily unavailable

_  10 ECHILD___ +No child processes

__ 9 EBADF___  +Bad file descriptor

__ 8 ENOEXEC__  +Exec format error

__ 7 E2BIG___  +Argument list too long

__ 6 ENXIO___  +No such device or address

__ 5 EIO____  +Input/output error

__ 4 EINTR___  +Interrupted system call

__ 3 ESRCH___  +No such process

__ 2 ENOENT___ +No such file or directory

__ 1 EPERM___  +Operation not permitted

#_  0 --_____  Success