glibc: update desc for content

Add libc_malloc_check.so (it's like libmcheck.a, but should be used with
LD_PRELOAD).

Add description for libmvec.

"libnss" -> "libnss_*", and reword the description.

1 files changed, 28 insertions, 5 deletions

diff --git a/chapter08/glibc.xml b/chapter08/glibc.xml
index 76dcb6ed1..fdb9cf544 100644
--- a/chapter08/glibc.xml
+++ b/chapter08/glibc.xml
@@ -487,7 +487,7 @@ mkdir -pv /etc/ld.so.conf.d</userinput></screen>
         zdump, and zic</seg>
         <seg>ld-linux-x86-64.so.2, ld-linux.so.2,
         libBrokenLocale.{a,so}, libanl.{a,so},
-        libc.{a,so}, libc_nonshared.a,
+        libc.{a,so}, libc_nonshared.a, libc_malloc_debug.so,
         libcrypt.{a,so}, libdl.{a,so.2}, libg.a, libm.{a,so},
         libmcheck.a, libmemusage.so, libmvec.{a,so}, libnsl.so.1,
         libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
@@ -782,6 +782,16 @@ mkdir -pv /etc/ld.so.conf.d</userinput></screen>
         </listitem>
       </varlistentry>
 
+      <varlistentry id="libc_malloc_debug">
+        <term><filename class="libraryfile">libc_malloc_debug</filename></term>
+        <listitem>
+          <para>Turns on memory allocation checking when preloaded</para>
+          <indexterm zone="ch-system-glibc libc_malloc_debug">
+            <primary sortas="c-libc_malloc_debug">libc_malloc_debug</primary>
+          </indexterm>
+        </listitem>
+      </varlistentry>
+
       <varlistentry id="libcrypt">
         <term><filename class="libraryfile">libcrypt</filename></term>
         <listitem>
@@ -825,6 +835,17 @@ mkdir -pv /etc/ld.so.conf.d</userinput></screen>
         </listitem>
       </varlistentry>
 
+      <varlistentry id="libmvec">
+        <term><filename class="libraryfile">libmvec</filename></term>
+        <listitem>
+          <para>The vector math library, linked in as needed
+          when <filename class='libraryfile'>libm</filename> is used</para>
+          <indexterm zone="ch-system-glibc libmvec">
+            <primary sortas="c-libmvec">libmvec</primary>
+          </indexterm>
+        </listitem>
+      </varlistentry>
+
       <varlistentry id="libmcheck">
         <term><filename class="libraryfile">libmcheck</filename></term>
         <listitem>
@@ -857,13 +878,15 @@ mkdir -pv /etc/ld.so.conf.d</userinput></screen>
       </varlistentry>
 
       <varlistentry id="libnss">
-        <term><filename class="libraryfile">libnss</filename></term>
+        <term><filename class="libraryfile">libnss_*</filename></term>
         <listitem>
-          <para>The Name Service Switch libraries, containing functions for
+          <para>The Name Service Switch modules, containing functions for
           resolving host names, user names, group names, aliases, services,
-          protocols, etc.</para>
+          protocols, etc.  Loaded by
+          <filename class='libraryfile'>libc</filename> according to the
+          configuration in <filename>/etc/nsswitch.conf</filename></para>
           <indexterm zone="ch-system-glibc libnss">
-            <primary sortas="c-libnss">libnss</primary>
+            <primary sortas="c-libnss">libnss_*</primary>
           </indexterm>
         </listitem>
       </varlistentry>