gbos - a tiny Unix-flavored OS for the Game Boy Color (kernel, shell, coreutils in C, RAM filesystem) https://git.sl0p.foo/gbos.git/atom/usr/stat.h?h=master 2026-09-24T10:48:37Z 2026-09-24T10:48:37Z user user@clank 2026-09-24T10:48:37Z urn:sha1:dc9dffb9069e32a1a0cf14883176544b234fc3e5 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 `>>`.