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POHow do different applications running in the same process share user id and app certificate
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  1. POHow do different applications running in the same process share user id and app certificate
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    copied!<p>It is about different applications running in the same process. I have read that they share a user id and are signed with the same certificate. </p> <p>My questions are:</p> <ol> <li><p>User ID is defined <a href="http://www.linfo.org/uid.html" rel="nofollow">here</a> as : </p> <blockquote> <p>A user ID (UID) is a unique positive integer assigned by a Unix-like operating system to each user. Each user is identified to the system by its UID, and user names are generally used only as an interface for humans.</p> </blockquote></li> </ol> <p>Now since users are applications installed on the linux system, user id is the unique identifier of the application in the linux system.</p> <p><strong>So how can two applications share the same user id. Moreover, what if two applications developed by different developers ever ever share the same user id?</strong></p> <p><ol> <li>I have read <a href="http://developer.android.com/tools/publishing/app-signing.html" rel="nofollow">here</a> that: </p> <blockquote> <p>The Android system requires that all installed applications be digitally signed with a certificate whose private key is held by the application's developer. The Android system uses the certificate as a means of identifying the author of an application and establishing trust relationships between applications.</li> </ol> <strong>So how can different applications, say developed by different developers, be signed with the same certificate?</strong></p> </blockquote> <p><strong>3. Can somebody give me an example in which components of different applications are running in the same process?</strong></p> <p>Thank you in advance.</p>
 

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