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#include <init/tar.h>
#include <shared/flags.h>
#include <shared/syscalls.h>
#include <stdint.h>
#define argify(str) str, sizeof(str) - 1
#define log(str) _syscall_write(tty_fd, argify(str), 0)
extern char _bss_start; // provided by the linker
extern char _bss_end;
extern char _initrd;
int tty_fd;
void read_file(const char *path, size_t len);
void fs_test(void);
void test_await(void);
__attribute__((section(".text.startup")))
int main(void) {
// allocate bss
_syscall_memflag(&_bss_start, &_bss_end - &_bss_start, MEMFLAG_PRESENT);
tty_fd = _syscall_open("/tty", sizeof("/tty") - 1);
if (tty_fd < 0)
_syscall_exit(argify("couldn't open tty"));
fs_test();
test_await();
_syscall_exit(argify("my job here is done."));
}
void read_file(const char *path, size_t len) {
int fd = _syscall_open(path, len);
static char buf[64];
int buf_len = 64;
_syscall_write(tty_fd, path, len, 0);
log(": ");
if (fd < 0) {
log("couldn't open.\n");
return;
}
buf_len = _syscall_read(fd, buf, buf_len, 0);
_syscall_write(tty_fd, buf, buf_len, 0);
_syscall_close(fd);
}
void fs_test(void) {
handle_t front, back;
front = _syscall_fs_create(&back);
if (_syscall_fork()) {
// child: is the fs server
tar_driver(back, &_initrd);
return;
}
// parent: accesses the fs
log("\n\n");
_syscall_mount(front, argify("/init"));
read_file(argify("/init/fake.txt"));
read_file(argify("/init/1.txt"));
read_file(argify("/init/2.txt"));
read_file(argify("/init/dir/3.txt"));
log("\nshadowing /init/dir...\n");
_syscall_mount(-1, argify("/init/dir"));
read_file(argify("/init/fake.txt"));
read_file(argify("/init/1.txt"));
read_file(argify("/init/2.txt"));
read_file(argify("/init/dir/3.txt"));
log("\n");
}
void test_await(void) {
char buf[16];
int len;
// the child immediately dies
if (!_syscall_fork())
_syscall_exit(argify("i'm dead"));
if (!_syscall_fork())
_syscall_exit(argify("i'm also dead"));
while ((len = _syscall_await(buf, 16)) >= 0) {
log("await returned: ");
_syscall_write(tty_fd, buf, len, 0);
log("\n");
}
log("await: negative len\n");
}
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