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#include <init/shell.h>
#include <init/stdlib.h>
#include <init/tar.h>
#include <shared/flags.h>
#include <shared/syscalls.h>
#include <stdint.h>
#define argify(str) str, sizeof(str) - 1
extern char _bss_start; // provided by the linker
extern char _bss_end;
extern char _initrd;
void read_file(const char *path, size_t len);
void fs_prep(void);
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(1);
fs_prep();
fs_test();
test_await();
shell_loop();
_syscall_exit(0);
}
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);
printf(": ");
if (fd < 0) {
printf("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_prep(void) {
handle_t front, back;
front = _syscall_fs_create(&back);
if (!_syscall_fork()) {
tar_driver(back, &_initrd);
_syscall_exit(1);
}
/* the trailing slash should be ignored by mount()
* TODO actually write tests */
_syscall_mount(front, argify("/init/"));
}
void fs_test(void) {
if (!_syscall_fork()) {
/* run the "test" in a child process to not affect the fs view of the
* main process */
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"));
printf("\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"));
printf("\n");
_syscall_exit(0);
} else _syscall_await();
}
void test_await(void) {
int ret;
if (!_syscall_fork()) {
/* this "test" runs in a child process, because otherwise it would be
* stuck waiting for e.g. the tar_driver process to exit */
// regular exit()s
if (!_syscall_fork()) _syscall_exit(69);
if (!_syscall_fork()) _syscall_exit(420);
// faults
if (!_syscall_fork()) { // invalid memory access
asm volatile("movb $69, 0" ::: "memory");
printf("this shouldn't happen");
_syscall_exit(-1);
}
if (!_syscall_fork()) { // #GP
asm volatile("hlt" ::: "memory");
printf("this shouldn't happen");
_syscall_exit(-1);
}
while ((ret = _syscall_await()) != ~0)
printf("await returned: %x\n", ret);
printf("await: no more children\n");
} else _syscall_await();
}
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