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<refentry xmlns="http://docbook.org/ns/docbook" xml:lang="en">
  <info>
    <author>
      <personname>
        <firstname>Guido</firstname>
        <surname>Berhoerster</surname>
      </personname>
      <email>guido+libpws@berhoerster.name</email>
      <personblurb/>
    </author>
    <date>21 March, 2015</date>
  </info>
  <refmeta>
    <refentrytitle>pws_init</refentrytitle>
    <manvolnum>3</manvolnum>
    <refmiscinfo class="source"/>
    <refmiscinfo class="version"/>
    <refmiscinfo class="manual">Library Functions</refmiscinfo>
  </refmeta>
  <refnamediv>
    <refname>pws_init</refname>
    <refname>pws_finalize</refname>
    <refname>pws_set_alloc_functions</refname>
    <refname>pws_generate_uuid</refname>
    <refpurpose>initalize and deinitialize libpws</refpurpose>
  </refnamediv>
  <refsynopsisdiv>
    <cmdsynopsis>
      <command>cc</command>
      <arg choice="opt" rep="repeat">
        <option>flag</option>
      </arg>
      <arg choice="plain" rep="repeat">
        <option>file</option>
      </arg>
      <arg choice="plain">
        <option>-lpws</option>
      </arg>
      <arg choice="plain">
        <option>-lnettle</option>
      </arg>
      <arg choice="opt" rep="repeat">
        <option>library</option>
      </arg>
    </cmdsynopsis>
    <funcsynopsis>
      <funcsynopsisinfo>
#include &lt;pws.h&gt;
</funcsynopsisinfo>
      <funcprototype>
        <funcdef>int <function>pws_init</function></funcdef>
        <void/>
      </funcprototype>
      <funcprototype>
        <funcdef>void <function>pws_finalize</function></funcdef>
        <void/>
      </funcprototype>
      <funcprototype>
        <funcdef>void <function>pws_set_alloc_functions</function></funcdef>
        <paramdef>void
        *<funcparams>*<replaceable>alloc_function</replaceable></funcparams><funcparams>size_t</funcparams></paramdef>
        <paramdef>void
        *<funcparams>*<replaceable>realloc_function</replaceable></funcparams><funcparams>void *, size_t</funcparams></paramdef>
        <paramdef>void <funcparams>*<replaceable>free_function</replaceable></funcparams><funcparams>void
        *, size_t</funcparams></paramdef>
        <paramdef>void
        *<funcparams>*<replaceable>secure_alloc_function</replaceable></funcparams><funcparams>size_t</funcparams></paramdef>
        <paramdef>void
        *<funcparams>*<replaceable>secure_realloc_function</replaceable></funcparams><funcparams>void *, size_t</funcparams></paramdef>
        <paramdef>void <funcparams>*<replaceable>secure_free_function</replaceable></funcparams><funcparams>void
        *, size_t</funcparams></paramdef>
      </funcprototype>
      <funcprototype>
        <funcdef>int <function>pws_generate_uuid</function></funcdef>
        <paramdef>unsigned char [static PWS3_UUID_SIZE]</paramdef>
      </funcprototype>
    </funcsynopsis>
    <synopsis>
<constant>LIBPWS_VERSION_MAJOR</constant>

<constant>LIBPWS_VERSION_MINOR</constant>

<constant>LIBPWS_VERSION_MICRO</constant>
    </synopsis>
  </refsynopsisdiv>
  <refsect1>
    <title>Description</title>
    <para>The <function>pws_init()</function> function initializes
    <citerefentry><refentrytitle>libpws</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    and must be called before any other function from this library.</para>
    <para>The <function>pws_finalize()</function> function deinitializes
    <citerefentry><refentrytitle>libpws</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    after which no other function from this library may be called.</para>
    <para>The <function>pws_set_alloc_functions()</function> function specifies
    the functions which are used by
    <citerefentry><refentrytitle>libpws</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    to allocate, reallocate or free memory allowing for the use of custom
    allocators. <function>pws_secure_alloc</function>,
    <function>pws_secure_realloc</function>, and
    <function>pws_secure_free</function> are used to allocate, reallocate, and
    free memory containing potentially sensitive information such as passwords,
    this e.g. allows for wrapping the acutal allocation using operating system
    specific facilities to prevent memory from being paged to the swap area or
    to overwrite memory before deallocating it. Any argument set to
    <constant>NULL</constant> will result in the default function being used,
    these are <function>malloc</function>, <function>realloc</function>, and a
    wrapper around <function>free</function>. This function must be called
    after <function>pws_init</function> and before calling any other function
    from this library. It is not reentrant.</para>
    <para>The <function>pws_uuid_create()</function> function generates a new
    random UUID following RFC4122 and places it in the array passed to
    it.</para>
    <para>The macros <constant>LIBPWS_VERSION_MAJOR</constant>,
    <constant>LIBPWS_VERSION_MINOR</constant>, and
    <constant>LIBPWS_VERSION_MICRO</constant> can be used to check the major,
    minor, and micro version of the library.</para>
  </refsect1>
  <refsect1>
    <title>Return Values</title>
    <para>The <function>pws_init()</function> function returns
    <returnvalue>0</returnvalue> if the library was initialized successfully and
    <returnvalue>-1</returnvalue> on failure.</para>
    <para>The <function>pws_generate_uuid()</function> returns
    <returnvalue>0</returnvalue> if a new random UUID has been generated and
    <returnvalue>-1</returnvalue> on failure.</para>
  </refsect1>
  <refsect1>
    <title>See Also</title>
    <para><citerefentry><refentrytitle>libpws</refentrytitle>
    <manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>pws3_file_create</refentrytitle>
    <manvolnum>3</manvolnum></citerefentry>, RFC4122</para>
  </refsect1>
</refentry>