LIBRRD(1)                           rrdtool                          LIBRRD(1)



NNAAMMEE
       librrd - RRD library functions

DDEESSCCRRIIPPTTIIOONN
       lliibbrrrrdd contains most of the functionality in RRRRDDTTooooll.  The command line
       utilities and language bindings are often just wrappers around the code
       contained in lliibbrrrrdd.

       This manual page documents the lliibbrrrrdd API.

       NNOOTTEE:: This document is a work in progress, and should be considered
       incomplete as long as this warning persists.  For more information
       about the lliibbrrrrdd functions, always consult the source code.

UUTTIILLIITTYY FFUUNNCCTTIIOONNSS
       _rr_rr_dd____rr_aa_nn_dd_oo_mm_((_))
           Generates random numbers just like _r_a_n_d_o_m_(_).  This further ensures
           that the random number generator is seeded exactly once per pro-
           cess.

       rrrrdd__aadddd__ppttrr((vvooiidd ******ddeesstt,, ssiizzee__tt **ddeesstt__ssiizzee,, vvooiidd **ssrrcc))
           Dynamically resize the array pointed to by "dest".  "dest_size" is
           a pointer to the current size of "dest".  Upon successful _r_e_a_l_-
           _l_o_c_(_), the "dest_size" is incremented by 1 and the "src" pointer is
           stored at the end of the new "dest".  Returns 1 on success, 0 on
           failure.

               type **arr = NULL;
               type *elem = "whatever";
               size_t arr_size = 0;
               if (!rrd_add_ptr(&arr, &arr_size, elem))
                   handle_failure();

       rrrrdd__aadddd__ssttrrdduupp((cchhaarr ******ddeesstt,, ssiizzee__tt **ddeesstt__ssiizzee,, cchhaarr **ssrrcc))
           Like "rrd_add_ptr", except adds a "strdup" of the source string.

               char **arr = NULL;
               size_t arr_size = NULL;
               char *str  = "example text";
               if (!rrd_add_strdup(&arr, &arr_size, str))
                   handle_failure();

       rrrrdd__ffrreeee__ppttrrss((vvooiidd ******ssrrcc,, ssiizzee__tt **ccnntt))
           Free an array of pointers allocated by "rrd_add_ptr" or
           "rrd_add_strdup".  Also frees the array pointer itself.  On return,
           the source pointer will be NULL and the count will be zero.

               /* created as above */
               rrd_free_ptrs(&arr, &arr_size);
               /* here, arr == NULL && arr_size == 0 */



1.3.99909060808                   2009-04-20                         LIBRRD(1)