The lseek function in Linux system calls

`lseek` function is a function in Linux system calls used to set the file offset. Its prototype is as follows:

#include <unistd.h>
off_t lseek(int fd, off_t offset, int whence);

The fd parameter refers to the integer value of the file descriptor for an open file.

The offset parameter is the number of bytes to be offset.

The parameter determines the baseline position of the offset, and you can use one of the following three constants:

Offset based on the start of the file.

Relative seek based on the current file offset.

Seeking based on the end position of the file.

The `lseek` function returns the new file offset. If an error occurs, it returns -1 and sets the global variable `errno` to indicate the specific type of error.

The `lseek` function allows for random access within a file. By setting the appropriate offset and position base, we can read or write data at any point in the file. This is particularly useful for handling large files or applications that need to jump to specific positions.