the number of which is specified by the caller, from the file and stores then into a buffer supplied by the calling process.

The read system call takes three arguments:

# The file descriptor of the file.
# The buffer where the read data is to be stored.
# The number of bytes to be read from the file.

POSIX usage

The read system call interface is standardized by the POSIX specification. Data from a file is read by calling the read function:

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