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Initial import of the CDE 2.1.30 sources from the Open Group.

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Peter Howkins
2012-03-10 18:21:40 +00:00
commit 83b6996daa
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cde/doc/C/guides/man/m3_tt/fd.sgm Normal file
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<!-- $XConsortium: fd.sgm /main/5 1996/08/30 12:45:42 rws $ -->
<!-- (c) Copyright 1995 Digital Equipment Corporation. -->
<!-- (c) Copyright 1995 Hewlett-Packard Company. -->
<!-- (c) Copyright 1995 International Business Machines Corp. -->
<!-- (c) Copyright 1995 Sun Microsystems, Inc. -->
<!-- (c) Copyright 1995 Novell, Inc. -->
<!-- (c) Copyright 1995 FUJITSU LIMITED. -->
<!-- (c) Copyright 1995 Hitachi. -->
<![ %CDE.C.CDE; [<RefEntry Id="CDEMX.XCDI.MAN69.rsml.1">]]>
<![ %CDE.C.XO; [<RefEntry Id="XCDI.MAN69.rsml.1">]]>
<RefMeta>
<RefEntryTitle>tt_fd</RefEntryTitle>
<ManVolNum>library call</ManVolNum>
</RefMeta>
<RefNameDiv>
<RefName><Function>tt_fd</Function></RefName>
<RefPurpose>return a file descriptor
</RefPurpose>
</RefNameDiv>
<!-- $XConsortium: fd.sgm /main/5 1996/08/30 12:45:42 rws $-->
<!-- CDE Common Source Format, Version 1.0.0-->
<!-- (c) Copyright 1993, 1994, 1995 Hewlett-Packard Company-->
<!-- (c) Copyright 1993, 1994, 1995 International Business Machines Corp.-->
<!-- (c) Copyright 1993, 1994, 1995 Sun Microsystems, Inc.-->
<!-- (c) Copyright 1993, 1994, 1995 Novell, Inc.-->
<RefSynopsisDiv>
<FuncSynopsis>
<FuncSynopsisInfo>#include &lt;Tt/tt_c.h>
</FuncSynopsisInfo>
<FuncDef>int <Function>tt_fd</Function></FuncDef>
<void>
</FuncSynopsis>
</RefSynopsisDiv>
<RefSect1>
<Title>DESCRIPTION</Title>
<Para>The
<Function>tt_fd</Function> function
returns a file descriptor.
The returned file descriptor alerts the process that a message has
arrived for the default
procid
in the default session.
</Para>
<Para>File descriptors are either active or inactive.
When the file descriptor becomes
active, the process must call
&cdeman.tt.message.receive; to receive the message.
</Para>
</RefSect1>
<RefSect1>
<Title>RETURN VALUE</Title>
<Para>Upon successful completion, the
<Function>tt_fd</Function> function returns the file descriptor for the current
procid.
The application can use
&cdeman.tt.int.error; to extract one of the following
<StructName Role="typedef">Tt_status</StructName> values from the returned integer:
</Para>
<VariableList>
<VarListEntry>
<Term>TT_OK</Term>
<ListItem>
<Para>The operation completed successfully.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>TT_ERR_NOMP</Term>
<ListItem>
<Para>The
&cdeman.ttsession; process is not running and the ToolTalk service cannot restart it.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>TT_ERR_PROCID</Term>
<ListItem>
<Para>The current default process identifier is out of date or invalid.
</Para>
</ListItem>
</VarListEntry>
<VarListEntry>
<Term>TT_ERR_SESSION</Term>
<ListItem>
<Para>The specified ToolTalk session is out of date or invalid.
</Para>
</ListItem>
</VarListEntry>
</VariableList>
</RefSect1>
<RefSect1>
<Title>APPLICATION USAGE</Title>
<Para>The application must have a separate file descriptor for each
procid.
To get an
associated file descriptor, the application should use
<Function>tt_fd</Function> each time it calls
&cdeman.tt.open;.</Para>
</RefSect1>
<RefSect1>
<Title>SEE ALSO</Title>
<Para>&cdeman.Tt.tt.c.h;, &cdeman.tt.open;, &cdeman.tt.int.error;, &cdeman.tt.message.receive;.</Para>
</RefSect1>
</RefEntry>
<!--fickle 1.12 mancsf-to-docbook 1.2 08/07/95 23:18:47-->