File read() : Reading a file in C Language

File read(): Reading a file in C Language
In this video, we will explore using the read() system call in C to read data from files. The read() function is a low-level I/O function in Unix-like operating systems that allows programs to access file contents directly. It is especially important for system-level programming where you need to manipulate data byte by byte.
1. Introduction to the read() function:
- Understanding the read() function syntax and parameters.
- How the read() function interacts with file descriptors.
- Differences between read() and higher-level I/O functions like fread().
2. Opening a file and using read() to access its contents:
- A detailed step-by-step demonstration of opening a file using open() and then reading from it using read()
- How to handle file descriptors and ensure proper file opening modes (O_RDONLY, etc.).
3. Reading file contents into a buffer:
- How to allocate memory for the buffer.
- How to read data into the buffer and handle the data read from the file.
- Handling partial reads: what happens if read() reads less data than requested.
4. Error handling:
- How to detect errors while reading from a file.
- Using errno to check for common errors such as file not found, permission issues, or reaching the end of the file.
5. Practical example:
- A working example of a C program that reads a file and prints its contents to the screen.
- Code explanations and output analysis.
By the end of this video, you will have a solid understanding of how to use read() to interact with files in C programming, allowing you to build more efficient system-level applications.

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