Adding upstream version 3.1.8.upstream/3.1.8upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.\"/*
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+.TH CPG_OVERVIEW 3 2009-4-15 "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"
+.SH NAME
+cpg_overview \- CPG library overview
+.SH OVERVIEW
+The CPG library is delivered with the corosync project.  This library is used
+to create distributed applications that operate properly during cluster
+partitions, merges, and faults.
+.PP
+The library provides a mechanism to:
+.PP
+* handle abstraction for multiple instances of a CPG library in one application
+.PP
+* join one or more groups
+.PP
+* leave one or more groups
+.PP
+* Deliver messages to members of that group
+.PP
+* Deliver configuration changes
+.PP
+* Iterate members of groups
+.PP
+.SH SECURITY
+If encryption is enabled in corosync.conf, the CPG library will encrypt and
+authenticate message contents.  Applications must run as the ais user to be
+validated by corosync on IPC connection, otherwise they will be unable to
+access the corosync services.
+
+.SH "SEE ALSO"
+.BR cpg_overview (3),
+.BR cpg_initialize (3),
+.BR cpg_finalize (3),
+.BR cpg_fd_get (3),
+.BR cpg_dispatch (3),
+.BR cpg_join (3),
+.BR cpg_leave (3),
+.BR cpg_mcast_joined (3),
+.BR cpg_model_initialize (3),
+.BR cpg_membership_get (3),
+.BR cpg_zcb_alloc (3),
+.BR cpg_zcb_free (3),
+.BR cpg_zcb_mcast_joined (3),
+.BR cpg_context_get (3),
+.BR cpg_context_set (3),
+.BR cpg_local_get (3),
+.BR cpg_iteration_initialize (3),
+.BR cpg_iteration_next (3),
+.BR cpg_iteration_finalize (3)
+.PP