UNIX network programming, vol.2: Interprocess communication by W. Richard Stevens

By W. Richard Stevens

Well-implemented interprocess communications (IPC) are key to the functionality of just about each non-trivial UNIX software. In UNIX community Programming, quantity 2, moment variation, mythical UNIX specialist W. Richard Stevens offers a entire advisor to each type of IPC, together with message passing, synchronization, shared reminiscence, and distant process Calls (RPC). Stevens starts off with a uncomplicated creation to IPC and the issues it's meant to resolve. step by step you are going to find out how to maximize either method V IPC and the hot Posix criteria, which supply dramatic advancements in comfort and function.

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The odds of creating a valid signature with the same public key but a different passphrase and private key are extremely remote. The chance of being able to forge a signature for a legitimate public key is infinitesimal. Chapter 1 • Downloading and Installing Open Source Tools 22 This method is based on trust. You trust that certain individuals and organizations will not sign data that is infected with malware. You trust that they will take adequate measures to keep their private keys and passphrases secret.

Let’s start with the permission string itself. This is represented with a tencharacter string. The first character indicates the type of file, whereas the remaining three groups of three characters summarize the file owner’s permission, the group members’ permissions, and everyone else’s permissions, respectively. The type of file is indicated with a single character. The valid values for this character and their meanings are listed in Table 1-4. The next nine characters can be grouped into three groups of three bits.

Some examples are shown in Table 1-5. The last things to know about permissions are the setuid, setgid, and sticky bits. These bits are not listed directly, because they affect the file’s behavior only when executing. When the setuid bit is set, the code in the file will execute, using the file’s owner as the effective user ID. This means that the program can do anything that the file’s owner has permission to do. If a file is owned by root and the setuid bit is set, the code has permission to modify or delete any file in the system, no matter which user starts the program.

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