LBER_SOCKBUF(3)           Library Functions Manual           LBER_SOCKBUF(3)

NAME         top

       ber_sockbuf_alloc,   ber_sockbuf_free,   ber_sockbuf_ctrl,  ber_sock‐
       buf_add_io, ber_sockbuf_remove_io, Sockbuf_IO - OpenLDAP LBER I/O in‐

LIBRARY         top

       OpenLDAP LBER (liblber, -llber)

SYNOPSIS         top

       #include <lber.h>

       Sockbuf *ber_sockbuf_alloc( void );

       void ber_sockbuf_free(Sockbuf *sb);

       int ber_sockbuf_ctrl(Sockbuf *sb, int opt, void *arg);

       int ber_sockbuf_add_io(Sockbuf *sb, Sockbuf_IO *sbio, int layer, void

       int ber_sockbuf_remove_io(Sockbuf *sb, Sockbuf_IO *sbio, int layer);

       typedef struct sockbuf_io_desc {
       int sbiod_level;
       Sockbuf *sbiod_sb;
       Sockbuf_IO *sbiod_io;
       void *sbiod_pvt;
       struct sockbuf_io_desc *sbiod_next;
       } Sockbuf_IO_Desc;

       typedef struct sockbuf_io {
       int (*sbi_setup)(Sockbuf_IO_Desc *sbiod, void *arg);
       int (*sbi_remove)(Sockbuf_IO_Desc *sbiod);
       int (*sbi_ctrl)(Sockbuf_IO_Desc *sbiod, int opt, void *arg);
       ber_slen_t (*sbi_read)(Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len);
       ber_slen_t (*sbi_write)(Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len);
       int (*sbi_close)(Sockbuf_IO_Desc *sbiod);
       } Sockbuf_IO;

DESCRIPTION         top

       These routines are used to manage the low level I/O operations
       performed by the Lightweight BER library. They are called implicitly
       by the other libraries and usually do not need to be called directly
       from applications.  The I/O framework is modularized and new
       transport layers can be supported by appropriately defining a
       Sockbuf_IO structure and installing it onto an existing Sockbuf.
       Sockbuf structures are allocated and freed by ber_sockbuf_alloc() and
       ber_sockbuf_free(), respectively. The ber_sockbuf_ctrl() function is
       used to get and set options related to a Sockbuf or to a specific I/O
       layer of the Sockbuf.  The ber_sockbuf_add_io() and
       ber_sockbuf_remove_io() functions are used to add and remove specific
       I/O layers on a Sockbuf.

       Options for ber_sockbuf_ctrl() include:

              Takes a Sockbuf_IO * argument and returns 1 if the given
              handler is installed on the Sockbuf, otherwise returns 0.

              Retrieves the file descriptor associated to the Sockbuf; arg
              must be a ber_socket_t *.  The return value will be 1 if a
              valid descriptor was present, -1 otherwise.

              Sets the file descriptor of the Sockbuf to the descriptor
              pointed to by arg; arg must be a ber_socket_t *.  The return
              value will always be 1.

              Toggles the non-blocking state of the file descriptor
              associated to the Sockbuf.  arg should be NULL to disable and
              non-NULL to enable the non-blocking state.  The return value
              will be 1 for success, -1 otherwise.

              Flush (read and discard) all available input on the Sockbuf.
              The return value will be 1.

              Returns non-zero if input is waiting to be read.

              Returns non-zero if the Sockbuf is ready to be written.

              Returns the maximum allowed size of an incoming message; arg
              must be a ber_len_t *.  The return value will be 1.

              Sets the maximum allowed size of an incoming message; arg must
              be a ber_len_t *.  The return value will be 1.

       Options not in this list will be passed down to each Sockbuf_IO
       handler in turn until one of them processes it. If the option is not
       handled ber_sockbuf_ctrl() will return 0.

       Multiple Sockbuf_IO handlers can be stacked in multiple layers to
       provide various functionality.  Currently defined layers include

              the lowest layer, talking directly to a network

              an intermediate layer

              a higher layer

       Currently defined Sockbuf_IO handlers in liblber include

              The default stream-oriented provider

              A stream-oriented provider for local IPC sockets

              A datagram-oriented provider. This handler is only present if
              the liblber library was built with LDAP_CONNECTIONLESS

              A buffering layer, usually used with a datagram provider to
              hide the datagram semantics from upper layers.

              A generic handler that outputs hex dumps of all traffic. This
              handler may be inserted multiple times at arbitrary layers to
              show the flow of data between other handlers.

       Additional handlers may be present in libldap if support for them was

              An application layer handler for SASL encoding/decoding.

              A transport layer handler for SSL/TLS encoding/decoding. Note
              that this handler is private to the library and is not exposed
              in the API.

       The provided handlers are all instantiated implicitly by libldap, and
       applications generally will not need to directly manipulate them.

SEE ALSO         top

       lber-decode(3), lber-encode(3), lber-types(3), ldap_get_option(3)


       OpenLDAP Software is developed and maintained by The OpenLDAP Project
       <>.  OpenLDAP Software is derived from the
       University of Michigan LDAP 3.3 Release.

COLOPHON         top

       This page is part of the OpenLDAP (an open source implementation of
       the Lightweight Directory Access Protocol) project.  Information
       about the project can be found at ⟨⟩.  If you
       have a bug report for this manual page, see
       ⟨⟩.  This page was obtained from the
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       ⟨git://⟩ on 2018-02-02.  (At that time,
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