Zig reimplementation of mini.c, with identical functionality.

• mini.zig: The Zig implementation
• mini: The compiled executable

C API	Zig API
fork()	std.posix.fork()
execl()	std.posix.execveZ()
stat()	std.posix.fstatatZ()
waitpid()	std.posix.waitpid()
sigtimedwait()	extern "c" binding to libc
sigdelset()	extern "c" binding to libc
sigprocmask()	std.posix.sigprocmask()
opendir()/readdir()/closedir()	extern "c" bindings to libc
getenv()	std.posix.getenvZ()
nanosleep()	std.time.sleep()

The isExecutable() function checks if a file is executable by:

1. Using posix.fstatatZ() to get file stat info
2. Verifying it's a regular file (linux.S.IFREG)
3. Checking if it has user execute permission (linux.S.IXUSR)

For each executable file found, the program:

1. Uses posix.fork() to create a child process
2. In the child process, uses posix.execveZ() to replace the process with the executable file
3. In the parent process, enters a sigtimedwait() signal loop to handle child events

When argv[0] ends with "loop", the program enters loop mode:

• Scans LOOP_DIR (default /.loop.d/) instead of MINI_DIR
• Tracks all spawned child processes (pid -> path mapping)
• When a child process exits, restarts it after LOOP_INTERVAL ms (default 2000ms)

The program blocks all signals except crash signals (SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGABRT, SIGTRAP, SIGSYS, SIGTTIN, SIGTTOU), then uses sigtimedwait() to handle:

• SIGINT / SIGTERM: graceful exit
• SIGCHLD: reap children, restart in loop mode

Variable	Description	Default
MINI_DIR	Directory to scan for executables (normal mode)	/.mini.d
LOOP_DIR	Directory to scan for executables (loop mode)	/.loop.d
LOOP_INTERVAL	Restart delay in ms (loop mode)	2000
MINI_VERBOSE	Enable verbose output (1 or true)	off

# Dynamic linking (glibc)
zig build-exe mini.zig -O ReleaseSmall -lc

# Static linking (musl, for containers)
zig build-exe mini.zig -O ReleaseSmall -target x86_64-linux-musl -lc

# Normal mode (scans /.mini.d/)
./mini

# Verbose mode
./mini verbose
# or
MINI_VERBOSE=1 ./mini

# Custom scan directory
MINI_DIR=./scripts ./mini

# Loop mode (symlink or rename executable to end with "loop")
ln -s mini mini-loop
./mini-loop