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<h3>Reporting an Error</h3>
<p>Should you find an error in <span class="title">Advanced Linux
Programming</span> that is not already listed here,
please send mail to
<a href="mailto:alp-errata@advancedlinuxprogramming.com">alp-errata@advancedlinuxprogramming.com</a>.</p>
<h3>Errata for <span class="title">Advanced Linux Programming</span></h3>
<ul>
<li>
<b>page <i>iv</i> (publication information)</b>
<p class="heading">Due to an oversight in production, an incorrect copyright notice
was included. The copyright notice should read:</p>
<blockquote>
Advanced Linux Programming
<br><br>
FIRST EDITION: June, 2001
<br><br>
Copyright © 2001 by New Riders Publishing. This material may be
distributed only subject to the terms and conditions set forth in the Open
Publication License, Version 1, no options exercised. (The latest version of this license
is available at <tt>http://www.opencontent.org/openpub/</tt>).
</blockquote>
</li>
<li>
<b>page <i>xx</i></b>
<p>The term "GNU/Linux" is misspelled as "GNU/Liux."</p>
</li>
<li>
<b>page 6</b>
<p>In Listing 1.1, add <tt>#include <stdlib.h></tt> since <tt>atoi</tt> is used.</p>
</li>
<li>
<b>page 8</b>
<p>The first paragraph of Section 1.2.2 should refer to <tt>reciprocal.cpp</tt>,
not <tt>utilties.cpp</tt>.</p>
</li>
<li>
<b>page 31</b>
<p>In the third paragraph, the third sentence should read:
<blockquote>
You should still always check for invalid input and produce sensible error
messages in response to such input.
</blockquote>
The words "to such" are missing in the book as printed.
</p>
</li>
<li>
<b>page 34</b>
<p>In the code, the comment for <code>case ENOENT</code> should
read <code>PATH does not exist</code>.
</p>
</li>
<li>
<b>page 38</b>
<p>
The first sentence in Section 2.3.2 should refer to <q>an archive</q>
rather than <q>a archive</q>.
</p>
</li>
<li>
<b>page 38</b>
<p>In the last sentence of the text, omitting the sidebar, the
resulting object file is <code>test1.o</code>, not <code>test.o</code>.
</p>
</li>
<li>
<b>page 39</b>
<p>In the first paragraph, the linker stops <em>searching</em>
directories.
</p>
</li>
<li>
<b>page 41</b>
<p>In the paragraph beginning with "Static libraries", modify
"If decide to link" to "If you decide to link".
</p>
</li>
<li>
<b>page 41</b>
<p>When linking statically, linking in the math library is
also required. Thus, the compilation line becomes
<code>gcc -static -o tifftest tifftest.c -ltiff -ljpeg -lz -lm</code>.
</p>
</li>
<li>
<b>page 43</b>
<p>The indented line of code near the bottom of the page should refer to <code>my_function</code>, not <code>foo</code>.
</p>
</li>
<li>
<b>page 48</b>
<p>In the first paragraph, the first technique has "considerable risks",
not "considerably risks".
</p>
</li>
<li>
<b>page 53</b>
<p>The word "it" in the last sentence of the second paragraph
should instead be "is".
In particular, the sentence should read:
<blockquote>
The default disposition for these signals is to terminate the process
and produce a core file.
</blockquote>
<li>
<b>page 57</b>
<p>The word "is" in the last sentence should instead be "it."
In particular, the sentence should read:
<blockquote>
Instead, when a child process terminates, it becomes a zombie process.
</blockquote>
<li>
<b>page 60</b>
<p>The code in <code>clean_up_child_process</code> would not work correctly if there were more
than one child process. The Linux kernel will only call the signal handler once if two or more
child processes terminate at almost the same time. Therefore, if there is may be more than one child
process, the signal handler must repeatedly call <code>waitpid</code> (or one of the other
related functions) with the <code>WNOHANG</code> option until <code>waitpid</code> returns zero.</p>
</li>
<li>
<b>page 73</b>
<p>In the first paragraph, the second argument is for <code>pthread_key_create</code>, not
<code>pthread_key_t</code>. Thus, the <code>pthread_key_create</code> function takes two arguments:
a pointer to a <code>pthread_key_t</code> variable and a cleanup function.</p>
</li>
<li>
<b>page 98</b>
<p>The example code for calling <code>shmget</code> should use <code>S_IWUSR</code>, not
<code>S_IWUSER</code>. This write permission flag is spelled correctly throughout the
rest of the page. For a list of available flags, see the section 2 <code>stat</code> man page.</p>
</li>
<li>
<b>page 108</b>
<p>In Listing 5.6, the function used to parse the string
should be <code>sscanf</code>, not <code>scanf</code>.</p>
</li>
<li>
<b>page 110</b>
<p>The last sentence of section 5.4.1 should read:
<blockquote>
Data written to the file descriptor <code>write_fd</code> can be read back from <code>read_fd</code>.
</blockquote>
<p>
The identifiers <code>write_fd</code> and <code>read_fd</code> are
swapped in the text as printed.</p>
</li>
<li>
<b>page 117</b>
<p>In section 5.5.2, the list of system calls should mention
<tt>close</tt>, not <tt>closes</tt>.</p>
</li>
<li>
<b>page 120</b>
<p>In Listing 5.10, <tt>text</tt> should be checked for the
<tt>quit</tt> message before it is freed. The consequent of the
<tt>strcmp</tt> should be <tt>free (text); return 1</tt>. Its
alternative should be <tt>free (text)</tt>. The standalone
<tt>free</tt> statement should be omitted.</p>
</li>
<li>
<b>page 121</b>
<p>In Listing 5.10, the <code>client_name_len</code> variable in
the <code>do</code>-loop should be initialized to
<code>sizeof(client_name)</code> before being passed to
<code>accept</code>.
</p>
</li>
<li>
<b>page 121</b>
<p>In Listing 5.10, the call to <code>bind</code> on the ninth
line of this page should cast the second argument to a
<code>struct sockaddr *</code>. That is, the <code>bind</code>
call should be
<blockquote>
<code>bind (socket_fd, (struct sockaddr *) &name, SUN_LEN (&name))</code>.
</blockquote></p>
<p>Similarly, on the nineteenth line, the second argument of
<code>accept</code> should be cast:
<blockquote>
<code>accept (socket_fd, (struct sockaddr *) &client_name, &client_name_len)</code>
</blockquote>
</p>
</li>
<li>
<b>page 122</b>
<p>In Listing 5.11, the call to <code>connect</code> on the sixth
line from the end should cast the second argument to a
<code>struct sockaddr *</code>. That is, the <code>connect</code>
call should be
<blockquote>
<code>connect (socket_fd, (struct sockaddr *) &name, SUN_LEN (&name))</code>.
</blockquote></p>
</p>
</li>
<li>
<b>page 125</b>
<p>In Listing 5.12, the call to <code>connect</code> on the second
line should cast the second argument to a
<code>struct sockaddr *</code>. That is, the <code>connect</code>
call should be
<blockquote>
<code>connect (socket_fd, (struct sockaddr *) &name, sizeof (struct sockaddr_in))</code>.
</blockquote></p>
</p>
</li>
<li>
<b>page 130</b>
<p>The third line of the first full paragraph should omit the word "cause".
</p>
</li>
<li>
<b>page 132</b>
<p>The sixth line of the first full paragraph should refer
to "the character device", not the "the block device".
</p>
</li>
<li>
<b>page 133</b>
<p>In the first footnote, the Windows device name should be <code>LPT1</code>,
not <code>LRP1</code>.
</li>
<li>
<b>page 133</b>
<p>In the second footnote, the ASCII code for a carriage return should be 13, not 14.</p>
</li>
<li>
<b>page 149</b>
<p>The check for whether or not the read failed should be:</p>
<blockquote>
<code>if (bytes_read == 0 || bytes_read != sizeof (buffer))</code>
</blockquote>
<p>
Note that the operator for the second half of the conditional should
be <code>!=</code> rather than <code>==</code>.
</p>
</li>
<li>
<b>page 171</b>
<p>In the third paragraph, use <code>F_SETLKW</code>, not <code>F_SETLCKW</code>. This
<code>LK</code> abbreviation differs from the <code>LCK</code> abbreviation in <code>F_RDLCK</code> and
<code>F_WRLCK</code>.
</p>
</li>
<li>
<b>page 174</b>
<p>The first sentence of the third paragraph of section 8.5
should end with "pointer to a <code>struct rlimit</code>", rather
than "pointer to a <code>structrlimit</code>" as printed. Note
the space between <code>struct</code> and <code>rlimit</code>.</p>
</li>
<li>
<b>page 181</b>
<p>The description of <code>tv_nsec</code> should read "<code>tv_nsec</code>,
an additional number of nanoseconds" rather than "<code>tv_nsec</code>,
an additional number of milliseconds."</p>
</li>
<li>
<b>page 183</b>
<p>The third parameter in the call to <code>readlink</code> should
be <code>sizeof (target_path) - 1</code> to allow for the terminating
<code>NUL</code> character.</p>
</li>
<li>
<b>page 185</b>
<p>The file presented in Listing 8.11 should be named "itimer.c".</p>
</li>
<li>
<b>page 186</b>
<p>The <code>sysinfo</code> manual page describes <code>struct
sysinfo</code>, not <code>structsysinfo</code>.</p>
</li>
<li>
<b>page 188</b>
<p>The file presented in Listing 8.11 should end with a ".c", i.e.,
"print-uname.c".</p>
</li>
<li>
<b>page 191</b>
<p>The assembly instructions shown corresponding to the <code>asm</code>
should be:
</p>
<blockquote><pre>
#APP
mycool_asm %ecx, %edx
#NOAPP
</pre></blockquote>
<p>
reflecting the fact that <code>foo</code> and <code>bar</code> are
in separate registers.
</p>
</li>
<li>
<b>page 206</b>
<p>In the beginning of 10.4.1, the root process impersonates
another user, not another process.</p>
</li>
<li>
<b>page 212</b>
<p>The prototype of the GNU extension <code>getline</code>
function differs from that presented. To use the GNU extension,
modify the code to</p>
<pre>
char *username = NULL;
size_t username_length = 0;
ssize_t characters_read = getline (&username, &username_length, stdin);
</pre>
<p>If the call fails, <code>characters_read</code> will be <code>-1</code>.
Otherwise, <code>username</code> will point to a <code>malloc</code>-allocated
buffer with <code>username_length</code> characters.</p>
</li>
<li>
<b>page 224</b>
<p>The third parameter in the call to <code>readlink</code> should
be <code>sizeof (link_target) - 1</code> to allow for the terminating
<code>NUL</code> character.</p>
</li>
<li>
<b>page 231</b>
<p>The third parameter in the first call to <code>write</code> should
be <code>strlen (bad_request_response)</code>.</p>
</li>
<li>
<b>page 241</b>
<p>The <code>error_page</code> string should note a failure to
open <code>/etc/issue</code>, not <code>/proc/issue</code>.</p>
</li>
<li>
<b>page 245</b>
<p>The comment above the <tt>get_group_name</tt> function should
say "deallocate with free", not "allocate with
free".</p>
</li>
<li>
<b>page 286</b>
<p>The first line inside the while loop is incorrect. It should
read:
<blockquote>
size_t written = write (fd, buffer + count - left_to_write,
left_to_write);
</blockquote>
</p>
</li>
</ul>
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