Compiling Code From Apue


Answer :

A short review of how to write and compile the programs in Advanced Programming in the UNIX® Environment, thanks to slm for helping me understand the steps. You can download the source code from here.
I wish this information was included as part of appendix b of the book,
where the header file is explained.



The uncompressed file contains directories with the names
of the chapters and two others named include and lib.
The ones with the names of the chapters have all the
programs of that chapter in them.



The include directory contains the header file that
is used in most of the programs in the book: apue.h.
The lib directory has the source code of the
implementations for the that header.



Lets assume the uncompressed file is located at:
SCADDRESS/, for example it might be:
/home/yourid/Downloads/apue.3e/



Once you uncompress the source code, go in the directory
and run make:



$ cd SCADDRESS
$ make


make will compile all the programs in all the chapters.
But the important thing is that before that, it will make
the library that will contain the implementations of the
functions in apue.h.



To compile an example program that you write from the book, run this GCC command (assuming your program's name is myls.c which is the first in the book): 



gcc -o myls myls.c -I SCADDRESS/include/ -L SCADDRESS/lib/ -lapue


-I tells gcc which directory to look for the include file.
-L tells it the location of the library directory, and
-lapue, tells the name of the library file to look for
in that directory. Such that -LXXX means to look for a file
in the library directory with the name: libXXX.a or libXXX.so.



I think this stackoverflow Q&A titled: Where is function err_sys() defined? has what you need. 2 of the answers in that thread had this to say:



A1




err_sys() is a function used in several books written by W. Richard Stevens. This function is used to print what type of error occurred.



The function is used in programs in the texts with a custom header file "ourhdr.h" (or something else). Check the appendix for the header listing or the function definition.




A2




The source for this function (from Advanced Programming in the UNIX® Environment, by W. Richard Stevens) can be found on the book's website: http://www.apuebook.com/.




References




  • GCC and Make Compiling, Linking and Building C/C++ Applications -- Searching for Header Files and Libraries (-I, -L and -l)



The following steps have worked for me (Ubuntu 14.04 64bit):




  1. wget http://www.apuebook.com/src.3e.tar.gz Download the gzipped tar archive from official book site

  2. tar xzf src.3e.tar.gz This creates the unzipped folder called apue.3e under current directory by default

  3. cd apue.3e

  4. sudo apt-get install libbsd-dev. This is for the link -lbsd in /threads

  5. make This will automatically compile all the source code in all the folders

  6. cd intro then ./ls1 .. works as expected (lists files from parent directory)



You may have to grep around to find other code snippets from the book but it should be straightforward.



Comments

Post a Comment

Popular posts from this blog

Converting A String To Int In Groovy

Answer : Use the toInteger() method to convert a String to an Integer , e.g. int value = "99".toInteger() An alternative, which avoids using a deprecated method (see below) is int value = "66" as Integer If you need to check whether the String can be converted before performing the conversion, use String number = "66" if (number.isInteger()) { int value = number as Integer } Deprecation Update In recent versions of Groovy one of the toInteger() methods has been deprecated. The following is taken from org.codehaus.groovy.runtime.StringGroovyMethods in Groovy 2.4.4 /** * Parse a CharSequence into an Integer * * @param self a CharSequence * @return an Integer * @since 1.8.2 */ public static Integer toInteger(CharSequence self) { return Integer.valueOf(self.toString().trim()); } /** * @deprecated Use the CharSequence version * @see #toInteger(CharSequence) */ @Deprecated public static Integer toInteger(String self) { return toInteg
Read more

"Cannot Create Cache Directory /home//.composer/cache/repo/https---packagist.org/, Or Directory Is Not Writable. Proceeding Without Cache"

Answer : if anyone pass through here, this is shorter solution: sudo chown -R $USER $HOME/.composer it seems to me the group information is missing in your command sudo chown -R <user> /home/<user>/.composer/cache/repo/https---packagist.org Shoud be sudo chown -R <user>:<group> /home/<user>/.composer/cache/repo/https---packagist.org But to avoid other permission issues, I would rather advise: sudo chown -R <user>:<group> /home/<user>/.composer/cache (you'll need access to other folders in there) and sudo chown <user>:<group> /home/<user>/.composer To make sure your user has permissions enough on the global composer folder. Mind the missing recursion so the user don't own keys created by root. If you need to find out the group: groups <user>
Read more

Android How Can I Convert A String To A Editable

Answer : As you probably found out, Editable is an interface so you cannot call new Editable() . However an Editable is nothing more than a String with Spannables, so use SpannableStringBuilder: Editable editable = new SpannableStringBuilder("Pass a string here"); If you only want to change the Spannables, never the text itself, you can use a basic SpannableString. Use Editable.Factory.getInstance().newEditable(str) From the android documentation: Returns a new SpannedStringBuilder from the specified CharSequence. You can override this to provide a different kind of Spanned.
Read more