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Mark Overmeer
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POSIX::1003::Errno - all error codes defined by the OS


   is a POSIX::1003::Module


  use POSIX::1003::Errno; # load all names

  use POSIX::1003::Errno qw(errno);
  # keys are strings!
  $ticks = errno('EPERM');

  use POSIX::1003::Errno qw(errno EPERM);
  if($!==EPERM) ...

  use POSIX::1003::Errno '%errno';
  my $key = $errno{EPERM};
  $errno{EUNKNOWN} = 1024;
  $ticks  = errno('EUNKNOWN');

  print "$_\n" for keys %errno;


The error codes provided by your operating system.

The code modules Errno and POSIX do also contain an extensive list of error numbers. However: Errno have their values hard-coded, which is incorrect (higher numbered codes may [do!] differ per platform). POSIX only provides a limited subset.

See documentation in the base class.


See documentation in the base class.


See "METHODS" in POSIX::1003::Module


See "METHODS" in POSIX::1003::Module


Standard POSIX


Returns the string representations of the ERRNO, as provided by the operating system.



Returns the errno value related to the NAMEd constant. The NAME must be a string. undef will be returned when the NAME is not known by the system.


  my $ticks = errno('EPERM') || 1000;

Returns a list with all known names, unsorted.



This exported variable is a tied HASH which maps E* names on numbers, to be used with the system's errno() function.

The following error names where detected on your system when the module got installed. The second column shows the related value. Followed by the text that strerror() produces for that error.

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


This module is part of POSIX-1003 distribution version 0.98, built on December 03, 2013. Website: http://perl.overmeer.net. The code is based on POSIX, which is released with Perl itself. See also POSIX::Util for additional functionality.


Copyrights 2011-2013 on the perl code and the related documentation by [Mark Overmeer]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html