What are some examples of system calls in Linux?

What are some examples of system calls in Linux?

System calls in Linux are the primary way for programs to interact with the kernel. Examples include open(), read(), write(), and close().

Can you explain what the open() system call does?

The open() system call is used to open a file descriptor for a file. It takes the file path and flags as arguments and returns a file descriptor.

What are the different flags I can use with open()?

Common flags include O_RDONLY for read-only access, O_WRONLY for write-only access, and O_RDWR for read and write access.

How do I use the read() system call?

The read() system call reads data from a file descriptor into a buffer. It requires the file descriptor, a buffer, and the number of bytes to read.