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Describe the difference between the MINIX read library call and these functions. How do you think these functions (getc, fgetc, getchar) perform data input? Do they always need to ultimately trap to the kernel? Why or why not?

Describe the difference between the MINIX read library call and these functions. How do you think these functions (getc, fgetc, getchar) perform data input? Do they always need to ultimately trap to the kernel? Why or why not?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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A system call in an operating system is typically a function call that traps to the kernel. However, there are also library calls that are functions that do not directly trap into the kernel, but may invoke system calls that do. In MINIX, there is a corresponding library call read that always invokes the system call. In UNIX, there are also several other library calls---getc, fgetc, getchar, for example---that also input data. Describe the difference between the MINIX read library call and these functions. How do you think these functions (getc, fgetc, getchar) perform data input? Do they always need to ultimately trap to the kernel? Why or why not?

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