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46 .TH POLL.H 3HEAD "Sep 9, 2004"
48 poll.h, poll \- definitions for the \fBpoll()\fR function
52 #include <\fBpoll.h\fR>
58 The <\fBpoll.h\fR> header defines the \fBpollfd\fR structure, which includes
59 the following members:
66 the following descriptor being polled
72 \fB\fBshort events\fR\fR
75 the input event flags (see below)
81 \fB\fBshort revents\fR\fR
84 the output event flags (see below)
89 The <\fBpoll.h\fR> header defines the following type through \fBtypedef\fR:
96 an unsigned integer type used for the number of file descriptors
101 The implementation supports one or more programming environments in which the
102 width of \fBnfds_t\fR is no greater than the width of type long. The names of
103 these programming environments can be obtained using the \fBconfstr()\fR
104 function or the \fBgetconf\fR utility. See \fBconfstr\fR(3C) and
108 The following symbolic constants are defined, zero or more of which can be
109 OR'ed together to form the \fBevents\fR or \fBrevents\fR members in the
110 \fBpollfd\fR structure:
117 Data other than high-priority data can be read without blocking.
123 \fB\fBPOLLRDNORM\fR\fR
126 Normal data can be read without blocking.
132 \fB\fBPOLLRDBAND\fR\fR
135 Priority data can be read without blocking.
144 High priority data can be read without blocking.
153 Normal data can be written without blocking.
159 \fB\fBPOLLWRNORM\fR\fR
162 Equivalent to \fBPOLLOUT\fR.
168 \fB\fBPOLLWRBAND\fR\fR
171 Priority data can be written.
180 An error has occurred (\fBrevents\fR only).
189 Device has been disconnected (\fBrevents\fR only).
198 Invalid \fBfd\fR member (\fBrevents\fR only).
203 The significance and semantics of normal, priority, and high-priority data are
204 file and device-specific.
208 See \fBattributes\fR(5) for descriptions of the following attributes:
216 ATTRIBUTE TYPE ATTRIBUTE VALUE
218 Interface Stability Standard
224 \fBgetconf\fR(1), \fBpoll\fR(2), \fBconfstr\fR(3C), \fBattributes\fR(5),