Materials for Topic 6: Vectored I/O & Memory-Mapping

Full C Programs

• writev_example.c - a C program demonstrating the use of the writev() vectored I/O system call to write 3 lines at once into a file.
• readv_example.c - a C program demonstrating the use of the readv() vectored I/O system call to read 3 lines at once from a file.
• mmap_example.c - a C program that maps a file into main memory using mmap(), thereby letting the program access it as an array of characters.

Runnable Linux Commands

• The command:
  gcc -Wall -Wextra -O2 -g -o program program.c
  compiles the C source code located inside the file program.c. See more details here.
• The command:
  . ./.short_prompt
  executes code inside a file named .short_prompt and sources it (applies all the changes to the current session.) See more details here.
• The command:
  . ./.long_prompt
  executes code inside a file named .long_prompt and sources it (applies all the changes to the current session.) See more details here.

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