Operating systems notes
System Calls & the User-Kernel Boundary
The one guarded door your code walks through every time it wants the kernel to do real work. Every section is a drawn page beside a clear written explanation, about 18 minutes in all.
- Chapter 6 of 37
- About 18 minutes
- 8 sections
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In this chapter
- The doorway between your code and the kernel
- What actually happens on a syscall (the trap)
- The system call, the wrapper, and libc
- Categories of system calls
- A concrete example: reading a file the hard way
- Why syscalls are (relatively) expensive
- Watching syscalls with strace
- Syscalls across OSes & the big picture
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