Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Describe the advantages of using a FileInputStream over a FileReader when dealing with binary data.
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- Problem 0. Suppose a file contains 100 bytes of data. A program successfully opens it for both reading and writing (i.e., passing the mode O_READWR to open()), and gets back a file descriptor number fd. a. The program, which has a 40-byte buffer, issues a call to read() for 40 bytes. It processes that data, and then repeats the call. Both calls return the exact amount requested. Then it issues a third read, again requesting 40 bytes. What value will it return? (Assume no other program has the file open.) b. Next the program calls write (fd, buffer, 40), and the call returns 40. Then it issues another read() call for 40 bytes. What value does that call return? c. Suppose the programmer needs to read back the 40 bytes just written. First it must use 1seek() to reposition the file pointer. What parameters should it invoke 1seek () with so that the next read call will return the 40 bytes just written?arrow_forwardWhat exactly about the idea of a file makes it so powerful?arrow_forwardHaving a master file with data that is almost indestructible serves no use.arrow_forward
- object of type streambuf. This object may represent a memory block that acts as an intermediary When we operate with file streams, these are associated to an internal between the stream and the physical file. For example, with an ofstream, each time the member function put (which writes a single character) is called, the character may be inserted in this intermediate buffer instead of being written directly to the physical file with which the stream is associated. O batch O switch binary O bufferarrow_forwardIf two links to an existing file are created in the same directory as the original (using the link syscall), how many inodes are used to store information about the three directory entries?arrow_forwardPLEASE I WANT SOLUTION TO THIS IN C LANGUAGEarrow_forward
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