Discussion
The 'read' system call returns :
Answer: A
The read system call returns the total number of bytes read.
read(fd, buf, count) returns the number of bytes actually read into the buffer, which may be less than count; it returns 0 at end of file and -1 on an error. Programs loop on this value to read a whole file.
The file descriptor is what open() returns and what read takes as its first argument. read returns no separate success flag and no address of the file.
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