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<!-- Copyright (C) 2003 Red Hat, Inc. --><!-- This material may be distributed only subject to the terms --><!-- and conditions set forth in the Open Publication License, v1.0 --><!-- or later (the latest version is presently available at --><!-- http://www.opencontent.org/openpub/). --><!-- Distribution of the work or derivative of the work in any --><!-- standard (paper) book form is prohibited unless prior --><!-- permission is obtained from the copyright holder. --><HTML><HEAD><TITLE>ioctl</TITLE><meta name="MSSmartTagsPreventParsing" content="TRUE"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="eCos Reference Manual"HREF="ecos-ref.html"><LINKREL="UP"TITLE="TCP/IP Library Reference"HREF="tcpip-library-reference.html"><LINKREL="PREVIOUS"TITLE="getsockopt"HREF="net-common-tcpip-manpages-getsockopt.html"><LINKREL="NEXT"TITLE="poll"HREF="net-common-tcpip-manpages-poll.html"></HEAD><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">eCos Reference Manual</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="net-common-tcpip-manpages-getsockopt.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 38. TCP/IP Library Reference</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="net-common-tcpip-manpages-poll.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="NET-COMMON-TCPIP-MANPAGES-IOCTL">ioctl</H1><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">IOCTL(2) System Calls Manual IOCTL(2)NAME ioctl - control deviceSYNOPSIS #include <sys/ioctl.h> int ioctl(int d, unsigned long request, ...);DESCRIPTION The ioctl() function manipulates the underlying device parameters of spe- cial files. In particular, many operating characteristics of character special files (e.g., terminals) may be controlled with ioctl() requests. The argument d must be an open file descriptor. The third argument is called arg and contains additional information needed by this device to perform the requested function. arg is either an int or a pointer to a device-specific data structure, depending upon the given request. An ioctl request has encoded in it whether the argument is an ``in'' parameter or ``out'' parameter, and the size of the third argument (arg) in bytes. Macros and defines used in specifying an ioctl request are located in the file <sys/ioctl.h>.RETURN VALUES If an error has occurred, a value of -1 is returned and errno is set to indicate the error.ERRORS ioctl() will fail if: [EBADF] d is not a valid descriptor. [ENOTTY] d is not associated with a character special device. [ENOTTY] The specified request does not apply to the kind of object that the descriptor d references. [EINVAL] request or arg is not valid. [EFAULT] arg points outside the process's allocated address space.SEE ALSO cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)HISTORY An ioctl() function call appeared in Version 7 AT&T UNIX.BSD December 11, 1993 BSD </PRE></TD></TR></TABLE></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="net-common-tcpip-manpages-getsockopt.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-ref.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="net-common-tcpip-manpages-poll.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">getsockopt</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="tcpip-library-reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">poll</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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