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The document is a lecture presentation for the course 15-213 at Carnegie Mellon University, focusing on System-Level I/O in Unix. It covers key topics such as Unix file types, basic I/O operations (opening, reading, writing, and closing files), file metadata, I/O redirection, and the differences between Unix I/O, Standard I/O, and RIO (Robust I/O). The document emphasizes the importance of understanding file descriptors, handling short counts in reads/writes, and provides examples of using various I/O functions effectively.

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What is the course average GPA for CMU?

Average GPA: 3.91 The average GPA at Carnegie Mellon is 3.91. (Most schools use a weighted GPA out of 4.0, though some report an unweighted GPA. With a GPA of 3.91, Carnegie Mellon requires you to be at the top of your class. Youll need nearly straight As in all your classes to compete with other applicants.

What does the write function do?

The write() method writes a specified text to the file. Where the specified text will be inserted depends on the file mode and stream position. a : The text will be inserted at the current file stream position, default at the end of the file.

What does read () do in C?

The read() function shall attempt to read nbyte bytes from the file associated with the open file descriptor, fildes, into the buffer pointed to by buf. The behavior of multiple concurrent reads on the same pipe, FIFO, or terminal device is unspecified.

What does write () return in C?

The write function returns the number of bytes successfully written into the file, which may at times be less than the specified nbytes.

What does RioWriten do?

Applications can transfer data directly between memory and a file by calling the rio readnand rio writen functions. The rio readn function transfers up to n bytes from the current file position of descriptor fd to memory location usrbuf.

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