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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title><errno.h></title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_003_256"> </a>NAME</h4><blockquote>errno.h - system error numbers</blockquote><h4><a name = "tag_000_003_257"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <errno.h></code></pre></blockquote><h4><a name = "tag_000_003_258"> </a>DESCRIPTION</h4><blockquote>The<i><errno.h></i>headerprovides a declaration for<i>errno</i>and gives non-zero values for the following symbolic constants.Their values are unique except as noted below:<dl compact><dt>E2BIG<dd>Argument list too long.<dt>EACCES<dd>Permission denied.<dt>EADDRINUSE<dd>Address in use.<dt>EADDRNOTAVAIL<dd>Address not available.<dt>EAFNOSUPPORT<dd>Address family not supported.<dt>EAGAIN<dd>Resource unavailable, try again(may be the same value as EWOULDBLOCK).<dt>EALREADY<dd>Connection already in progress.<dt>EBADF<dd>Bad file descriptor.<dt>EBADMSG<dd>Bad message.<dt>EBUSY<dd>Device or resource busy.<dt>ECANCELED<dd>Operation canceled.<dt>ECHILD<dd>No child processes.<dt>ECONNABORTED<dd>Connection aborted.<dt>ECONNREFUSED<dd>Connection refused.<dt>ECONNRESET<dd>Connection reset.<dt>EDEADLK<dd>Resource deadlock would occur.<dt>EDESTADDRREQ<dd>Destination address required.<dt>EDOM<dd>Mathematics argument out of domain of function.<dt>EDQUOT<dd>Reserved.<dt>EEXIST<dd>File exists.<dt>EFAULT<dd>Bad address.<dt>EFBIG<dd>File too large.<dt>EHOSTUNREACH<dd>Host is unreachable.<dt>EIDRM<dd>Identifier removed.<dt>EILSEQ<dd>Illegal byte sequence.<dt>EINPROGRESS<dd>Operation in progress.<dt>EINTR<dd>Interrupted function.<dt>EINVAL<dd>Invalid argument.<dt>EIO<dd>I/O error.<dt>EISCONN<dd>Socket is connected.<dt>EISDIR<dd>Is a directory.<dt>ELOOP<dd>Too many levels of symbolic links.<dt>EMFILE<dd>Too many open files.<dt>EMLINK<dd>Too many links.<dt>EMSGSIZE<dd>Message too large.<dt>EMULTIHOP<dd>Reserved.<dt>ENAMETOOLONG<dd>Filename too long.<dt>ENETDOWN<dd>Network is down.<dt>ENETUNREACH<dd>Network unreachable.<dt>ENFILE<dd>Too many files open in system.<dt>ENOBUFS<dd>No buffer space available.<dt>ENODATA<dd>No message is available on the STREAM head read queue.<dt>ENODEV<dd>No such device.<dt>ENOENT<dd>No such file or directory.<dt>ENOEXEC<dd>Executable file format error.<dt>ENOLCK<dd>No locks available.<dt>ENOLINK<dd>Reserved.<dt>ENOMEM<dd>Not enough space.<dt>ENOMSG<dd>No message of the desired type.<dt>ENOPROTOOPT<dd>Protocol not available.<dt>ENOSPC<dd>No space left on device.<dt>ENOSR<dd>No STREAM resources.<dt>ENOSTR<dd>Not a STREAM.<dt>ENOSYS<dd>Function not supported.<dt>ENOTCONN<dd>The socket is not connected.<dt>ENOTDIR<dd>Not a directory.<dt>ENOTEMPTY<dd>Directory not empty.<dt>ENOTSOCK<dd>Not a socket.<dt>ENOTSUP<dd>Not supported.<dt>ENOTTY<dd>Inappropriate I/O control operation.<dt>ENXIO<dd>No such device or address.<dt>EOPNOTSUPP<dd>Operation not supported on socket.<dt>EOVERFLOW<dd>Value too large to be stored in data type.<dt>EPERM<dd>Operation not permitted.<dt>EPIPE<dd>Broken pipe.<dt>EPROTO<dd>Protocol error.<dt>EPROTONOSUPPORT<dd>Protocol not supported.<dt>EPROTOTYPE<dd>Socket type not supported.<dt>ERANGE<dd>Result too large.<dt>EROFS<dd>Read-only file system.<dt>ESPIPE<dd>Invalid seek.<dt>ESRCH<dd>No such process.<dt>ESTALE<dd>Reserved.<dt>ETIME<dd>Stream<i><a href="ioctl.html">ioctl()</a></i>timeout.<dt>ETIMEDOUT<dd>Connection timed out.<dt>ETXTBSY<dd>Text file busy.<dt>EWOULDBLOCK<dd>Operation would block(may be the same value as [EAGAIN]).<dt>EXDEV<dd>Cross-device link.</dl><br></blockquote><h4><a name = "tag_000_003_259"> </a>APPLICATION USAGE</h4><blockquote>Additional error numbers may be defined on XSI-conformant systems. See<xref href=adderr><a href="errors.html#tag_000_004_001">Additional Error Numbers</a></xref>.</blockquote><h4><a name = "tag_000_003_260"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_003_261"> </a>SEE ALSO</h4><blockquote><a href="errors.html">errors</a>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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