NAME

       errno.h - system error numbers

SYNOPSIS

       #include <errno.h>

DESCRIPTION

       Some of the functionality described on this reference page extends the ISO C standard. Any
       conflict between the requirements described here and the ISO C standard is  unintentional.
       This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

       The ISO C standard only requires the symbols [EDOM], [EILSEQ], and [ERANGE] to be defined.

       The  <errno.h>  header  shall provide a declaration for errno and give positive values for
       the following symbolic constants. Their values shall be unique except as noted below.

       E2BIG  Argument list too long.

       EACCES Permission denied.

       EADDRINUSE
              Address in use.

       EADDRNOTAVAIL
              Address not available.

       EAFNOSUPPORT
              Address family not supported.

       EAGAIN Resource unavailable, try again (may be the same value as [EWOULDBLOCK]).

       EALREADY
              Connection already in progress.

       EBADF  Bad file descriptor.

       EBADMSG
              Bad message.

       EBUSY  Device or resource busy.

       ECANCELED
              Operation canceled.

       ECHILD No child processes.

       ECONNABORTED
              Connection aborted.

       ECONNREFUSED
              Connection refused.

       ECONNRESET
              Connection reset.

       EDEADLK
              Resource deadlock would occur.

       EDESTADDRREQ
              Destination address required.

       EDOM   Mathematics argument out of domain of function.

       EDQUOT Reserved.

       EEXIST File exists.

       EFAULT Bad address.

       EFBIG  File too large.

       EHOSTUNREACH
              Host is unreachable.

       EIDRM  Identifier removed.

       EILSEQ Illegal byte sequence.

       EINPROGRESS
              Operation in progress.

       EINTR  Interrupted function.

       EINVAL Invalid argument.

       EIO    I/O error.

       EISCONN
              Socket is connected.

       EISDIR Is a directory.

       ELOOP  Too many levels of symbolic links.

       EMFILE Too many open files.

       EMLINK Too many links.

       EMSGSIZE
              Message too large.

       EMULTIHOP
              Reserved.

       ENAMETOOLONG
              Filename too long.

       ENETDOWN
              Network is down.

       ENETRESET
              Connection aborted by network.

       ENETUNREACH
              Network unreachable.

       ENFILE Too many files open in system.

       ENOBUFS
              No buffer space available.

       ENODATA
              No message is available on the STREAM head read queue.

       ENODEV No such device.

       ENOENT No such file or directory.

       ENOEXEC
              Executable file format error.

       ENOLCK No locks available.

       ENOLINK
              Reserved.

       ENOMEM Not enough space.

       ENOMSG No message of the desired type.

       ENOPROTOOPT
              Protocol not available.

       ENOSPC No space left on device.

       ENOSR  No STREAM resources.

       ENOSTR Not a STREAM.

       ENOSYS Function not supported.

       ENOTCONN
              The socket is not connected.

       ENOTDIR
              Not a directory.

       ENOTEMPTY
              Directory not empty.

       ENOTSOCK
              Not a socket.

       ENOTSUP
              Not supported.

       ENOTTY Inappropriate I/O control operation.

       ENXIO  No such device or address.

       EOPNOTSUPP
              Operation not supported on socket.

       EOVERFLOW
              Value too large to be stored in data type.

       EPERM  Operation not permitted.

       EPIPE  Broken pipe.

       EPROTO Protocol error.

       EPROTONOSUPPORT

              Protocol not supported.

       EPROTOTYPE
              Protocol wrong type for socket.

       ERANGE Result too large.

       EROFS  Read-only file system.

       ESPIPE Invalid seek.

       ESRCH  No such process.

       ESTALE Reserved.

       ETIME  Stream ioctl() timeout.

       ETIMEDOUT
              Connection timed out.

       ETXTBSY
              Text file busy.

       EWOULDBLOCK
              Operation would block (may be the same value as [EAGAIN]).

       EXDEV  Cross-device link.

       The following sections are informative.

APPLICATION USAGE

       Additional error numbers may be defined on conforming systems; see the  System  Interfaces
       volume of IEEE Std 1003.1-2001.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The System Interfaces volume of IEEE Std 1003.1-2001, Section 2.3, Error Numbers

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .