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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><stropts.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_009_162"> </a>NAME</h4><blockquote>stropts.h - STREAMS interface</blockquote><h4><a name = "tag_000_009_163"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <stropts.h></code></pre></blockquote><h4><a name = "tag_000_009_164"> </a>DESCRIPTION</h4><blockquote>The<i><stropts.h></i>header defines the<b>bandinfo</b>structure that includes at least the following members:<pre><code>unsigned char bi_priint bi_flag</code></pre><p>The<i><stropts.h></i>header defines the<b>strpeek</b>structure that includes at least the following members:<pre><code>struct strbuf ctlbufstruct strbuf databuft_uscalar_t flags</code></pre><p>The<i><stropts.h></i>header defines the<b>strbuf</b>structure that includes at least the following members:<pre><code>int maxlen maximum buffer lengthint len length of datachar *buf ptr to buffer</code></pre><p>The<i><stropts.h></i>header defines the<b>strfdinsert</b>structure that includes at least the following members:<pre><code>struct strbuf ctlbufstruct strbuf databuft_uscalar_t flagsint fildesint offset</code></pre><p>The<i><stropts.h></i>header defines the<b>strioctl</b>structure that includes at least the following members:<pre><code>int ic_cmdint ic_timoutint ic_lenchar *ic_dp</code></pre><p>The<i><stropts.h></i>header defines the<b>strrecvfd</b>structure that includes at least the following members:<pre><code>int fduid_t uidgid_t gid</code></pre><p>The <b>uid_t</b>and<b>gid_t</b>types are defined through<b>typedef</b>as described in<i><a href="systypes.h.html"><sys/types.h></a></i>.<p>The<b>t_uscalar_t</b>type is defined as described in<i><a href="../xns/xti.h.html"><xti.h></a></i>in the referenced <b>Networking Services, Issue 5</b> specification.<p>The<i><stropts.h></i>header defines the<b>str_list</b>structure that includes at least the following members:<pre><code>int sl_nmodsstruct str_mlist *sl_modlist</code></pre><p>The<i><stropts.h></i>header defines the<b>str_mlist</b>structure that includes at least the following member:<pre><code>char l_name[FMNAMESZ+1]</code></pre><p>At least the following macros are defined for use as the <i>request</i>argument to<i><a href="ioctl.html">ioctl()</a></i>:<dl compact><dt>I_PUSH<dd>Push STREAMS module onto the top of the current STREAM, just below the STREAMhead.<dt>I_POP<dd>Remove STREAMS module from just below the STREAM head.<dt>I_LOOK<dd>Retrieve the name of the module just below the STREAM head and place it in acharacter string.At least the following macros are defined for use as the<i>arg</i>argument:<dl compact><dt>FMNAMESZ<dd>The minimum size in bytes of the buffer referred to by the <i>arg</i> argument.</dl><p><p><dt>I_FLUSH<dd>This request flushes all input and/or output queues, depending on the value ofthe <i>arg</i> argument.At least the following macros are defined for use as the<i>arg</i>argument:<dl compact><dt>FLUSHR<dd>Flush read queues.<dt>FLUSHW<dd>Flush write queues.<dt>FLUSHRW<dd>Flush read and write queues.</dl><p><p><dt>I_FLUSHBAND<dd>Flush only band specified.<p><dt>I_SETSIG<dd>Informs the STREAM head that the process wants the SIGPOLL signal issued (see<i><a href="signal.html">signal()</a></i>and<i><a href="sigset.html">sigset()</a></i>)when a particular event has occurred on the STREAM.<p>The header <<b>stropts.h</b>> defines these possible values for <i>arg</i> whenI_SETSIG is specified:<dl compact><dt>S_RDNORM<dd>A normal (priority band set to 0) message has arrived at the headof a STREAM head read queue.<dt>S_RDBAND<dd>A message with a non-zero priority band has arrived at the head ofa STREAM head read queue.<dt>S_INPUT<dd>A message, other than a high-priority message,has arrived at the head of a STREAM head read queue.<dt>S_HIPRI<dd>A high-priority message is present on a STREAM head read queue.<dt>S_OUTPUT<dd>The write queue for normal data (priority band 0) just below the STREAMhead is no longer full. This notifies the process that there is room on thequeue for sending (or writing) normal data downstream.<dt>S_WRNORM<dd>Same as S_OUTPUT.<dt>S_WRBAND<dd>The write queue for a non-zero priority band just below the STREAM head is nolonger full.<dt>S_MSG<dd>A STREAMS signal message that contains the SIGPOLL signal reaches the front ofthe STREAM head read queue.<dt>S_ERROR<dd>Notification of an error condition reaches the STREAM head.<dt>S_HANGUP<dd>Notification of a hangup reaches the STREAM head.<dt>S_BANDURG<dd>When used in conjunction with S_RDBAND, SIGURG is generated instead of SIGPOLLwhen a priority message reaches the front of the STREAM head read queue.</dl><p><p><dt>I_GETSIG<dd>Returns the events for which the calling process iscurrently registered to be sent a SIGPOLL signal.<p><dt>I_FIND<dd>Compares the names of all modules currently present inthe STREAM to the name pointed to by <i>arg</i>.<p><dt>I_PEEK<dd>Allows a process to retrieve the information in the first message on theSTREAM head read queue without taking the message off the queue.At least the following macros are defined for use as the<i>arg</i>argument:<dl compact><dt>RS_HIPRI<dd>Only look for high-priority messages.</dl><p><dt>I_SRDOPT<dd>Sets the read mode.At least the following macros are defined for use as the<i>arg</i>argument:<dl compact><dt>RNORM<dd>Byte-STREAM mode, the default.<dt>RMSGD<dd>Message-discard mode.<dt>RMSGN<dd>Message-nondiscard mode.<dt>RPROTNORM<dd>Fail<i><a href="read.html">read()</a></i>with [EBADMSG] if a message containing a control part is at the front of theSTREAM head read queue.<dt>RPROTDAT<dd>Deliver the control part of a message as data when a process issues a<i><a href="read.html">read()</a></i>.<dt>RPROTDIS<dd>Discard the control part of a message, delivering any data part,when a process issues a<i><a href="read.html">read()</a></i>.</dl><p><p><dt>I_GRDOPT<dd>Returns the current read mode setting.<p><dt>I_NREAD<dd>Counts the number of data bytes in data blocks in the first message on theSTREAM head read queue.<p><dt>I_FDINSERT<dd>Creates a message from the specified buffer(s), adds information about anotherSTREAM, and sends the message downstream.<p><dt>I_STR<dd>Constructs an internal STREAMS<i><a href="ioctl.html">ioctl()</a></i>message and sends that message downstream.<p><dt>I_SWROPT<dd>Sets the write mode.At least the following macros are defined for use as the<i>arg</i>argument:<dl compact><dt>SNDZERO<dd>Send a zero-length message downstream when a<i><a href="write.html">write()</a></i>of 0 bytes occurs.</dl><p><dt>I_GWROPT<dd>Returns the current write mode setting.<p><dt>I_SENDFD<dd>Requests the STREAM associated with <i>fildes</i> to send a message,containing a file pointer, to the STREAM head at the other end of aSTREAMS pipe.<p><dt>I_RECVFD<dd>Retrieves the file descriptor associated with the message sent by an I_SENDFD<i><a href="ioctl.html">ioctl()</a></i>over a STREAMS pipe.<p><dt>I_LIST<dd>This request allows the process to list all the module names on theSTREAM, up to and including the topmost driver name.<p><dt>I_ATMARK<dd>This request allows the process to see if the current message onthe STREAM head read queue is "marked" by some module downstream.At least the following macros are defined for use as the<i>arg</i>argument:<dl compact><dt>ANYMARK<dd>Check if the message is marked.<dt>LASTMARK<dd>Check if the message is the last one marked on the queue.</dl><p><p><dt>I_CKBAND<dd>Check if the message of a given priority band exists on the STREAMhead read queue.<p><dt>I_GETBAND<dd>Return the priority band of the first message on the STREAM head read queue.<p><dt>I_CANPUT<dd>Check if a certain band is writable.<p><dt>I_SETCLTIME<dd>Allows the process to set the time the STREAM head will delaywhen a STREAM is closing and there is data on the write queues.<p><dt>I_GETCLTIME<dd>Returns the close time delay.<p><dt>I_LINK<dd>Connects two STREAMs.<p><dt>I_UNLINK<dd>Disconnects the two STREAMs. The header defines at least the following valuefor <i>arg</i>:<dl compact><dt>MUXID_ALL<dd>Unlink all STREAMs linked to the STREAM associated with <i>fildes</i>.</dl><p><p><dt>I_PLINK<dd>Connects two STREAMs with a persistent link.<p><dt>I_PUNLINK<dd>Disconnects the two STREAMs that were connected with a persistent link.<p></dl><p>The following macros are defined for<i><a href="getmsg.html">getmsg()</a></i>,<i><a href="getpmsg.html">getpmsg()</a></i>,<i><a href="putmsg.html">putmsg()</a></i>and<i><a href="putpmsg.html">putpmsg()</a></i>:<dl compact><dt>MSG_ANY<dd>Receive any message.<dt>MSG_BAND<dd>Receive message from specified band.<dt>MSG_HIPRI<dd>Send/Receive high priority message.<dt>MORECTL<dd>More control information is left in message.<dt>MOREDATA<dd>More data is left in message.</dl><p>The header <<b>stropts.h</b>> may make visible all of thesymbols from <<b>unistd.h</b>>.<p>The following are declared as functions in the <<b>stropts.h</b>> headerand may also be defined as macros.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>int <a href="isastream.html">isastream</a>(int);int <a href="getmsg.html">getmsg</a>(int, struct strbuf *, struct strbuf *, int *);int <a href="getpmsg.html">getpmsg</a>(int, struct strbuf *, struct strbuf *, int *, int *);int <a href="ioctl.html">ioctl</a>(int, int, ... );int <a href="putmsg.html">putmsg</a>(int, const struct strbuf *, const struct strbuf *, int);int <a href="putpmsg.html">putpmsg</a>(int, const struct strbuf *, const struct strbuf *, int, int);int <a href="fattach.html">fattach</a>(int, const char *);int <a href="fdetach.html">fdetach</a>(const char *);</code></pre></blockquote><h4><a name = "tag_000_009_165"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_166"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_167"> </a>SEE ALSO</h4><blockquote><i><a href="close.html">close()</a></i>,<i><a href="fcntl.html">fcntl()</a></i>,<i><a href="getmsg.html">getmsg()</a></i>,<i><a href="ioctl.html">ioctl()</a></i>,<i><a href="open.html">open()</a></i>,<i><a href="pipe.html">pipe()</a></i>,<i><a href="read.html">read()</a></i>,<i><a href="poll.html">poll()</a></i>,<i><a href="putmsg.html">putmsg()</a></i>,<i><a href="signal.html">signal()</a></i>,<i><a href="sigset.html">sigset()</a></i>,<i><a href="write.html">write()</a></i>,<i><a href="../xns/xti.h.html"><xti.h></a></i>.</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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