doc: Add man pages for ap_init/ap_fini

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+.so ap_init.3
diff --git a/doc/man/ap_init.3 b/doc/man/ap_init.3
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+.\" Ouroboros man pages (C) 2017
+.\" Dimitri Staessens <[email protected]>
+.\" Sander Vrijders <[email protected]>
+
+.TH AP_INIT 3 2017-04-10 GNU "Ouroboros Programmer's Manual"
+
+.SH NAME
+
+ap_init, ap_fini \- initialize and finalize an application for using
+Ouroboros
+
+.SH SYNOPSIS
+
+.B #include <ouroboros/dev.h>
+
+\fBint ap_init(char * \fIapn\fB);\fR
+
+\fBvoid ap_fini(void);\fR
+
+Compile and link with \fI-louroboros\fR.
+
+.SH DESCRIPTION
+
+The \fBap_init\fR() call initializes an application process instance
+for using the Ouroboros IPC infrastructure. If the application is a
+server or peer, a \fBchar * \fIapn\fR has to be provided indicating the
+application process that this instance belongs to. This is usually
+argv[0]. A client application may pass NULL. The \fBap_fini\fR() call
+will release all resources allocated by \fBap_fini\fR().
+
+\fBap_init\fR() and \fBap_fini\fR() should be called only once in the
+application.
+
+.SH RETURN VALUE
+
+On success, \fBap_init\fR() returns 0. On failure, a negative value
+indicating the error will be returned. The \fBap_fini\fR() function
+has no return value.
+
+.SH ERRORS
+
+\fBap_init\fR() can return the following errors:
+
+.B -EIRMD
+Failed to contact an IRMd instance.
+
+.B -ENOMEM
+Insufficient system resources to intialize the application.
+
+.SH ATTRIBUTES
+
+For an explanation of the terms used in this section, see \fBattributes\fR(7).
+
+.TS
+box, tab(&);
+LB|LB|LB
+L|L|L.
+Interface & Attribute & Value
+_
+\fBap_init\fR() & Thread safety & MT-Safe
+_
+\fBap_fini\fR() & Thread safety & MT-Safe
+.TE
+
+.SH COLOPHON
+This page is part of the Ouroboros project, found at
+https://bitbucket.org/ouroboros-rina/ouroboros