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LIBPDEL(3)	       FreeBSD Library Functions Manual		    LIBPDEL(3)

     libpdel --	multi-purpose C	library	for embedded applications

     PDEL Library (libpdel, -lpdel)

     The Packet	Design Embedded	Library	(PDEL) is a C library containing an
     assorted collection of code useful	for developing embedded	applications:

     -	 C data	structure run-time introspection library: structs(3)
	 -   Support for automated conversion to/from XML
	 -   Pre-defined types for most	C data structures
     -	 Threaded HTTP client/server library: http_server(3)
	 -   SSL support
	 -   User-definable C "servlets": http_servlet(3)
	 -   Several pre-defined servlets
	 -   Support for XML/HTTP and XML-RPC: http_xml(3)
     -	 PPP stack library (FreeBSD only): pdel_ppp(3)
	 -   Netgraph(4) based for kernel data packet handling
	 -   Servers for PPTP and L2TP
     -	 Application configuration framework: app_config(3)
     -	 Heap memory accounting	and sanity checking: typed_mem(3)
     -	 File template library:	tmpl(3)
     -	 Routines to configure networking interfaces, ARP table, and routing
	 table (FreeBSD	only): if_util(3), route_msg(3), uroute(3)
     -	 Logging library: alog(3)
	 -   Automated storage into circular file: logfile(3)
	 -   syslog(3) compatibile
     -	 Generic Unix Domain server: domain_server(3)
     -	 Generic TCP server: tcp_server(3)
     -	 Generic hash table implementation: ghash(3)
     -	 Generic balanced tree implementation: gtree(3)
     -	 FILE *	enhancements:
	 -   Generic data "filters": filter_fopen(3)
	 -   MIME boundary input streams: boundary_fopen(3)
	 -   Fixed length input	streams: count_fopen(3)
	 -   String buffer input/output	streams: string_fp(3)
	 -   Timeout streams: timeout_fdopen(3)
	 -   SSL streams: ssl_fp(3)
     -	 Base-64 encoding/decoding: base64(3)
     -	 Events	and actions with automated locking: paction(3),	pevent(3)
     -	 Generalized per-thread	variables: tinfo(3)
     -	 Message ports:	mesg_port(3)
     -	 Digital signature creation/verification: rsa_util_sign(3)
     -	 Filesystem mounting/unmounting	(FreeBSD only):	fs_mount(3)
     -	 String	quoting/parsing: string_enquote(3)

     For more details, see the individual man pages referenced above.

     Unlike Java, libraries written in C cannot	presume	a commonly accepted
     standard for handling certain issues like threading and heap allocation.
     Therefore,	libpdel	makes certain assumptions which	user code must follow.

     First, all	heap memory in libpdel is allocated through the	typed_mem(3)
     typed memory system.  Participation by user code in this system is	op-
     tional, but it must be done, or not done, consistently.

     The libpdel library assumes that pthread(3) is used for user-level
     threading.	 In general, libpdel objects are not safe to be	called simul-
     taneously from separate threads, or re-entrantly from the same thread,
     except where explicitly documented.  For example, the application must
     guarantee serialized access to a ghash(3) hash table; the hash table it-
     self does not provide this	protection.

     Some threads that can end up running user code are	subject	to cancella-
     tion at any cancellation point.  For example, a thread created by an
     http_server(3) object to handle an	HTTP request will be canceled if the
     remote client closes the TCP connection.  This implies that any user code
     which could be running under such a thread	must register thread cleanup
     hooks to release any resources such as heap memory, mutexes, etc.,	should
     the thread	be canceled.

     All libpdel functions are cancel-safe if the thread has cancel type
     PTHREAD_CANCEL_DEFERRED, except where noted.

     Because libpdel in	turn depends on	other libraries, programs linking with
     libpdel must also link with these libraries:

     -	 SSL: -lssl
     -	 Cryptography: -lcrypto
     -	 Netgraph (FreeBSD only): -lnetgraph
     -	 RADIUS	(FreeBSD only):	-lradius
     -	 Expat:	-L/usr/local/lib -lexpat
     -	 Pthreads: -pthread (-lpthread on Linux)

     Expat is available	as FreeBSD port	"textproc/expat2" (see ports(7)).

     alog(3), app_config(3), base64(3),	boundary_fopen(3), count_fopen(3),
     domain_server(3), filter_fopen(3),	fs_mount(3), ghash(3), gtree(3),
     http_client(3), http_server(3), if_util(3), logfile(3), paction(3),
     pdel_ppp(3), pevent(3), pthread(3), route_msg(3), rsa_util_sign(3),
     string_enquote(3),	string_fp(3), structs(3), tcp_server(3),
     timeout_fdopen(3),	tinfo(3), tmpl(3), typed_mem(3), uroute(3)

     Threads, Single UNIX Specification, Version 2, The	Open Group,

     James Clark, Expat	XML Parser,

     The PDEL library was developed at Packet Design, LLC.

     Archie Cobbs <>
     Mark Gooderum <>

     Some functionality	is only	supported under	FreeBSD.

     Please report bugs	to the author.

FreeBSD	13.0		       October 25, 2006			  FreeBSD 13.0


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