Errno man page

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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 .



IEEE/The Open Group                  2003                         <errno.h>(P)





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