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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* test_sys_fs_extra.cc — Self-tests for additional filesystem syscalls
*
* Tests: dup3, chdir/getcwd, writev, ioctl (stub), unlinkat (stub).
* Complements test_vfs_io.cc which covers the core read/write/open/close.
*/
#include <lume/selftest.h>
#include <lume/errno.h>
#include <lume/file.h>
#include <lume/fs.h>
#include <lume/fs_types.h>
#include <lume/task.h>
/* Syscall entry points */
int64 sys_openat(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_close(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_read(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_write(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_dup3(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_chdir(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getcwd(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_writev(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_ioctl(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_unlinkat(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_mkdirat(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_lseek(uint64, uint64, uint64, uint64, uint64, uint64);
/* ================================================================== */
/* Helpers */
/* ================================================================== */
static int64 open_dev(const char* path, int flags)
{
return sys_openat(
static_cast<uint64>(-100),
reinterpret_cast<uint64>(path),
static_cast<uint64>(flags), 0, 0, 0);
}
static int64 do_close(int64 fd)
{
return sys_close(static_cast<uint64>(fd), 0, 0, 0, 0, 0);
}
static int64 do_read(int64 fd, void* buf, uint64 count)
{
return sys_read(static_cast<uint64>(fd),
reinterpret_cast<uint64>(buf), count, 0, 0, 0);
}
/* iovec must match sys_fs.cc definition */
struct test_iovec {
void* iov_base;
uint64 iov_len;
};
/* ================================================================== */
/* Tests */
/* ================================================================== */
void selftest_sys_fs_extra()
{
/* ---- dup3: duplicate fd to specific target ---- */
st_begin("sys_fs: dup3 duplicates to specific fd");
{
int64 fd = open_dev("/dev/null", O_RDONLY);
ST_ASSERT(fd >= 0);
/* dup3 to fd 50 */
int64 fd2 = sys_dup3(static_cast<uint64>(fd), 50, 0, 0, 0, 0);
ST_ASSERT_EQ(fd2, (int64)50);
/* Both should work */
char buf[4];
int64 r = do_read(fd2, buf, 4);
ST_ASSERT_EQ(r, (int64)0); /* /dev/null → EOF */
do_close(fd);
do_close(fd2);
}
st_pass();
/* ---- dup3: same fd returns -EINVAL ---- */
st_begin("sys_fs: dup3 same fd returns -EINVAL");
{
int64 fd = open_dev("/dev/null", O_RDONLY);
ST_ASSERT(fd >= 0);
int64 ret = sys_dup3(static_cast<uint64>(fd),
static_cast<uint64>(fd), 0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-EINVAL);
do_close(fd);
}
st_pass();
/* ---- chdir to /dev, getcwd returns /dev ---- */
st_begin("sys_fs: chdir then getcwd returns new dir");
{
/* Save cwd */
char saved_cwd[64] = {};
sys_getcwd(reinterpret_cast<uint64>(saved_cwd), 64, 0, 0, 0, 0);
/* chdir to /dev */
int64 ret = sys_chdir(
reinterpret_cast<uint64>("/dev"), 0, 0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)0);
/* getcwd should return /dev */
char buf[64] = {};
int64 len = sys_getcwd(
reinterpret_cast<uint64>(buf), 64, 0, 0, 0, 0);
ST_ASSERT(len > 0);
ST_ASSERT_EQ(buf[0], '/');
ST_ASSERT_EQ(buf[1], 'd');
ST_ASSERT_EQ(buf[2], 'e');
ST_ASSERT_EQ(buf[3], 'v');
/* Restore cwd to / */
sys_chdir(reinterpret_cast<uint64>("/"), 0, 0, 0, 0, 0);
}
st_pass();
/* ---- chdir to nonexistent returns -ENOENT ---- */
st_begin("sys_fs: chdir nonexistent returns -ENOENT");
{
int64 ret = sys_chdir(
reinterpret_cast<uint64>("/no_such_dir"), 0, 0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-ENOENT);
}
st_pass();
/* ---- chdir to file returns -ENOTDIR ---- */
st_begin("sys_fs: chdir to file returns -ENOTDIR");
{
int64 ret = sys_chdir(
reinterpret_cast<uint64>("/dev/null"), 0, 0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-ENOTDIR);
}
st_pass();
/* ---- writev: scatter write to file ---- */
st_begin("sys_fs: writev scatter write");
{
/* Create a file, write with writev, read back */
int64 fd = sys_openat(
static_cast<uint64>(-100),
reinterpret_cast<uint64>("/writev_test"),
O_CREAT | O_RDWR, 0644, 0, 0);
ST_ASSERT(fd >= 0);
char a[] = "AAA";
char b[] = "BBB";
test_iovec iov[2];
iov[0].iov_base = a;
iov[0].iov_len = 3;
iov[1].iov_base = b;
iov[1].iov_len = 3;
int64 w = sys_writev(
static_cast<uint64>(fd),
reinterpret_cast<uint64>(iov), 2, 0, 0, 0);
ST_ASSERT_EQ(w, (int64)6);
/* Seek back to start and read */
sys_lseek(static_cast<uint64>(fd), 0, 0 /* SEEK_SET */, 0, 0, 0);
char buf[8] = {};
int64 r = do_read(fd, buf, 8);
ST_ASSERT_EQ(r, (int64)6);
ST_ASSERT_EQ(buf[0], 'A');
ST_ASSERT_EQ(buf[3], 'B');
do_close(fd);
}
st_pass();
/* ---- writev: bad fd returns -EBADF ---- */
st_begin("sys_fs: writev bad fd returns -EBADF");
{
test_iovec iov[1];
char dummy[] = "x";
iov[0].iov_base = dummy;
iov[0].iov_len = 1;
int64 ret = sys_writev(999,
reinterpret_cast<uint64>(iov), 1, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-EBADF);
}
st_pass();
/* ---- ioctl stub returns -ENOTTY ---- */
st_begin("sys_fs: ioctl stub returns -ENOTTY");
{
int64 fd = open_dev("/dev/null", O_RDONLY);
ST_ASSERT(fd >= 0);
int64 ret = sys_ioctl(static_cast<uint64>(fd), 0, 0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-ENOTTY);
do_close(fd);
}
st_pass();
/* ---- unlinkat stub returns -ENOSYS ---- */
st_begin("sys_fs: unlinkat stub returns -ENOSYS");
{
int64 ret = sys_unlinkat(
static_cast<uint64>(-100),
reinterpret_cast<uint64>("/some_file"),
0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-ENOSYS);
}
st_pass();
/* ---- getcwd: null buf returns -EINVAL ---- */
st_begin("sys_fs: getcwd null buf returns -EINVAL");
{
int64 ret = sys_getcwd(0, 64, 0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-EINVAL);
}
st_pass();
/* ---- getcwd: zero size returns -EINVAL ---- */
st_begin("sys_fs: getcwd zero size returns -EINVAL");
{
char buf[4];
int64 ret = sys_getcwd(
reinterpret_cast<uint64>(buf), 0, 0, 0, 0, 0);
ST_ASSERT_EQ(ret, (int64)-EINVAL);
}
st_pass();
}
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