|
|
Four things userland had no way to ask for:
- SYS_STAT: type, link count, size and inode for a path. The trap needs HL
for its dispatch table, so a call taking both a path and an output buffer
passes a request block - the shape SYS_NET already established. usr/stat.h
wraps it, header-only like sock.h, because the block must live in the
caller's RAM.
- SYS_FSSTAT: blocks/inodes, total and free. The bitmaps are already cached
write-through in fs_bmbuf, so this is the popcount boot_fs already prints.
- SYS_ISATTY: is this process's stdin the console? The shell needs it to tell
an interactive session from a script.
- O_APPEND: open a file positioned at EOF. There is no seek syscall, so this
is the only way to add to a file - without it nothing running ON the Game
Boy can build a multi-line file, shell scripts included.
Together these back ls -l, df, and `>>`.
|
