Overview of read(), write(), and close() System Calls can be explained as follows

We are required to understand the purpose and the syntax of the read write and close system calls so that we can move on to understand how the communication works between the several Linux processes. The read system call is taken in use to read the data from the file descriptor.  The synopsis of the system call is given below:

#include <unistd.h>

ssize_t read(int fd, void *buf, size_t count);

read() attempts  to  read  up  to  count  bytes from the file descriptor fd into the buffer starting at the buf. If the count is zero, read() returns zero  and  has  no  other following results. If the count is greater than SSIZE_MAX, the result remains unspecified. On the success, read() returns the number of bytes read (zero indicates end of the file) and advances the file position pointer by this number.

The write() system call is used to write to a file. Its synopsis is written below:

#include <unistd.h>

ssize_t write(int fd, const void *buf, size_t count);

write() attempts  to  write  up  to  count  bytes  to  the  file  referenced  by  the  file descriptor fd from buffer begning at buf. On the success, write() returns many bytes written are returned (zero indicates nothing was written their) and advances file position pointer by this number. On error,  read() returns -1, and errno is set appropriately. If count is zero then the file descriptor refers to a regular file, 0 will be returned without causing any other effect on it.

The close() system call is used to close the file descriptor. Its synopsis is given below:

#include <unistd.h>

int close(int fd);

close() closes  the  file  descriptor,  so  that it no longer refers to any of the file and may be reused. If the fd is the last copy of the particular file descriptor the resources related to it are freed; if the descriptor was the last reference to the file which has been removed by using the unlink(2) the file is deleted. close() returns zero on success, or -1 if an error occurred.

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