Changing linked library for a given executable (CentOs 6) Ask Question Asked 8 years, 4 months ago. Where the libcrypto and libssl libraries are openssl 1.0.0-fips libs. I want to experiment with the 1.0.1 libraries instead, and so I've built them in my home directory.

When you create or update a dynamic library, you should carefully consider how it may be used by developers in their products. It’s also important to give these developers flexibility by allowing their products to work with earlier or later versions of the library without them having to update their products.

This article demonstrates how to write a dynamic library so that it’s easy to use by developers who want to take advantage of it in their own development. This article also describes how to update existing libraries and manage their version information to maximize client compatibility.

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Sep 07, 2014 I am porting my game Rescue from Linux to the Mac (and Windows), and I am including several shared libraries with the game. I wanted the dynamic linker to look in the same directory for the libraries. Setting DYLDLIBRARYPATH=. Or the full path to the directory is one option, and it works. There's no security issue with running my game.

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Creating Libraries

When creating a dynamic library, you should perform these tasks:

Define the library’s purpose: This information provides the focus required to define the library’s public interface.
Define the library’s interface (header files): This is the interface through which the library’s clients access its functionality.
Implement the library (implementation files): This is where you define the public functions that the library’s clients use. You may also need to define private variables and functions needed to implement the interface but not required by clients.
Set the library’s version information: The library’s version information is divided in three parts: major, minor, and compatibility. You specify all the parts of the library’s version information when you create the .dylib file. See Managing Client Compatibility With Dependent Libraries for details.
Test the library: At the very least, you should define a test for each of the public functions your library exposes, to ensure that they perform the correct action given particular test inputs or after performing a specific set of operations.

The following sections provide an example of the process taken to develop a simple dynamic library, called Ratings. The files mentioned in the following sections are included in Ratings/1.0 in this document’s companion-file package.

Defining the Library’s Purpose

The purpose of the Ratings library is to provide a ratings analyzer to its clients. Ratings are strings made up of asterisks (*) that represent levels of satisfaction for a particular item. For example, in Apple’s iTunes app, you can specify whether you like a particular song a lot with a five-star rating (*****) or not at all with a one-star rating (*).

The initial release of the library provides a way for clients to add ratings, get a count of the ratings they have added, get the mean rating, and clear the rating set. https://naviyellow943.weebly.com/blog/microsoft-outlook-links-not-opening-mac-com.

Defining the Library’s Interface

Before you implement the library, you must define the interface the library’s clients use to interact with it. You should carefully specify each function’s semantics. A clear definition benefits you because it makes clear the purpose of each public function. It also benefits developers who use your library because it tells them exactly what to expect when they call each function in their code.

This is an example of a list of interface functions with each function’s semantic meaning:

void addRating(char *rating): Adds a rating value to the set kept by the library. The rating argument is a string; it must not be NULL. Each character in the string represents one rating point. For example, an empty string (') is equivalent to a rating of 0, '*' means 1, '**' means 2, and so on. The actual characters used in the string are immaterial. Therefore, ' ' means 1 and '3456' means 4. Each call to this function increments the value returned by the ratings function.
int ratings(void): Returns the number of rating values in the set. This function has no side effects.
char *meanRatings(void): Returns the mean rating in the rating set as a string, using one asterisk per rating point. This function has no side effects.
clearRatings(void): Clears the rating set. After calling this function (with no subsequent calls to addRating), the ratings function returns 0.

Listing 1 shows the header file that the Ratings library’s clients include to access its interface.

Listing 1 Interface to Ratings 1.0

Implementing the Library

The interface declared in Defining the Library’s Interface is implemented in Ratings.c , shown in Listing 2.

Listing 2 Implementation of Ratings 1.0

The following list describes the tagged lines.

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This comment is only to remind the library’s developers to compile this file with the compiler -fvisibility=hidden option, so that only the symbols with the visibility('default') attribute are exported.
This initializer is defined only to show at which point of a client’s execution the library’s initializers are called by the dynamic loader.
This finalizer is defined only to show at which point of client’s execution the library’s finalizers are called by the dynamic loader.
The _add function is an example of an internal function. Clients don’t need to know about it and, therefore, it’s not exported. Also, because internal calls are trusted, no validation is performed. However, there’s no requirement that internal-use functions lack validation.
The addRating function is an example of an exported function. To ensure that only correct ratings are added, the function’s input parameter is validated.

Setting the Library’s Version Information

When you compile the library’s source files into a .dylib file, you set version information that specifies whether clients can use versions of the library earlier or later than the version they were linked with. When the client is loaded into a process, the dynamic loader looks for the .dylib file in the library search paths and, if it finds it, compares the version information of the .dylib file with the version information recorded in the client image. If the client is not compatible with the .dylib file, the dynamic loader doesn’t load the client into the process. In effect, the client’s load process is aborted because the dynamic loader was unable to locate a compatible dependent library.

Listing 3 shows the command used to generate version 1.0 of the Ratings library.

Listing 3 Generating version 1.0 of the Ratings dynamic library

This list indicates where the major version, minor version, and compatibility version are specified:

The major version number is specified in the library’s filename as “A” in -o libRatings.A.dylib.
The minor version number is specified in -current_version 1.0.
The compatibility version number is specified in -compatibility_version 1.0.

Note: You can use libtool to create a dynamic library from a set of object files.

Testing the Library

Before publishing a dynamic library, you should test its public interface to ensure that it performs as you specified in the interface’s documentation (see Defining the Library’s Interface. To provide maximum flexibility to clients, you should make sure that your library can be used as a dependent library (clients link with it, and the library is loaded when the client is loaded) or as a runtime-loaded library (clients don’t link with it and use dlopen(3) OS X Devel