Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 10.3, Problem 10.1PP
Program Plan Intro
Opening and Closing files:
Using “Open” function, a process can open an existing file or generates a new file.
- This function is used to converts a filename to a file descriptor and returns the result as a descriptor number.
- The descriptor returned is always the lowest descriptor that is not presently open in the process.
- Each process in the LINUX begins life with three open files.
- Descriptor 0 – standard input.
- Descriptor 1 – standard output.
- Descriptor 2 – standard error.
- The “open” function consists of three arguments. That is “Open(filename, flags, mode)”.
- The argument “filename” defines the name of the given file.
- The argument “flags” represents how the process plans to access the file. Some flags names are as follows.
- O_RDONLY – it means reading only.
- O_WRONLY – it means writing only.
- O_RDWR – it means reading and writing.
- The “mode” argument identifies the access permission bits of new files.
Example:
The example for open an existing file for reading is shown below:
sample1 = Open("foo1.txt", O_RDONLY, 0);
From the above “open” function,
- The filename is “foo1.txt”.
- Flag name is “O_RDONLY”.
- Mode is “0”.
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Chapter 10 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 10.3 - Prob. 10.1PPCh. 10.8 - Practice Problem 10.2 (solution page 915) Suppose...Ch. 10.8 - Practice Problem 10.3 (solution page 915) As...Ch. 10.9 - Prob. 10.4PPCh. 10.9 - Practice Problem 10.5 (solution page 916) Assuming...Ch. 10 - Prob. 10.6HWCh. 10 - Prob. 10.7HWCh. 10 - Write a version of the statcheck program in Figure...Ch. 10 - Consider the following invocation of the...Ch. 10 - Prob. 10.10HW
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