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os_linux additions + libc to syscalls

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CiD-
2022-01-12 14:36:18 -05:00
parent f2f6c3c67d
commit 774951e8c0
1 changed files with 231 additions and 46 deletions
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277
core/os/os_linux.odin
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@@ -266,33 +266,142 @@ X_OK :: 1 // Test for execute permission
W_OK :: 2 // Test for write permission
R_OK :: 4 // Test for read permission
AT_FDCWD :: -100
AT_REMOVEDIR :: uintptr(0x200)
AT_SYMLINK_NOFOLLOW :: uintptr(0x100)
_unix_open :: proc(path: cstring, flags: int, mode: int = 0o000) -> Handle {
when ODIN_ARCH != "arm64" {
res := int(intrinsics.syscall(unix.SYS_open, uintptr(rawptr(path)), uintptr(flags), uintptr(mode)))
} else { // NOTE: arm64 does not have open
res := int(intrinsics.syscall(unix.SYS_openat, uintptr(AT_FDCWD), uintptr(rawptr(path), uintptr(flags), uintptr(mode))))
}
return -1 if res < 0 else Handle(res)
}
_unix_close :: proc(fd: Handle) -> int {
return int(intrinsics.syscall(unix.SYS_close, uintptr(fd)))
}
_unix_read :: proc(fd: Handle, buf: rawptr, size: uint) -> int {
return int(intrinsics.syscall(unix.SYS_read, uintptr(fd), uintptr(buf), uintptr(size)))
}
_unix_write :: proc(fd: Handle, buf: rawptr, size: uint) -> int {
return int(intrinsics.syscall(unix.SYS_write, uintptr(fd), uintptr(buf), uintptr(size)))
}
_unix_seek :: proc(fd: Handle, offset: i64, whence: int) -> i64 {
when ODIN_ARCH == "amd64" || ODIN_ARCH == "arm64" {
return i64(intrinsics.syscall(unix.SYS_lseek, uintptr(fd), uintptr(offset), uintptr(whence)))
} else {
low := uintptr(offset & 0xFFFFFFFF)
high := uintptr(offset >> 32)
result: i64
res := i64(intrinsics.syscall(unix.SYS__llseek, uintptr(fd), high, low, &result, uintptr(whence)))
return -1 if res < 0 else result
}
}
_unix_stat :: proc(path: cstring, stat: ^OS_Stat) -> int {
when ODIN_ARCH == "amd64" {
return int(intrinsics.syscall(unix.SYS_stat, uintptr(rawptr(path)), uintptr(stat)))
} else when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_stat64, uintptr(rawptr(path)), uintptr(stat)))
} else { // NOTE: arm64 does not have stat
return int(intrinsics.syscall(unix.SYS_fstatat, uintptr(AT_FDCWD), uintptr(rawptr(path)), uintptr(stat), 0))
}
}
_unix_fstat :: proc(fd: Handle, stat: ^OS_Stat) -> int {
when ODIN_ARCH == "amd64" || ODIN_ARCH == "arm64" {
return int(intrinsics.syscall(unix.SYS_fstat, uintptr(fd), uintptr(stat)))
} else {
return int(intrinsics.syscall(unix.SYS_fstat64, uintptr(fd), uintptr(stat)))
}
}
_unix_lstat :: proc(path: cstring, stat: ^OS_Stat) -> int {
when ODIN_ARCH == "amd64" {
return int(intrinsics.syscall(unix.SYS_lstat, uintptr(rawptr(path)), uintptr(stat)))
} else when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_lstat64, uintptr(rawptr(path)), uintptr(stat)))
} else { // NOTE: arm64 does not have any lstat
return int(intrinsics.syscall(unix.SYS_fstatat, uintptr(AT_FDCWD), uintptr(rawptr(path)), uintptr(stat), AT_SYMLINK_NOFOLLOW))
}
}
_unix_readlink :: proc(path: cstring, buf: rawptr, bufsiz: uint) -> int {
when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_readlink, uintptr(rawptr(path)), uintptr(buf), uintptr(bufsiz)))
} else { // NOTE: arm64 does not have readlink
return int(intrinsics.syscall(unix.SYS_readlinkat, uintptr(AT_FDCWD), uintptr(rawptr(path)), uintptr(buf), uintptr(bufsiz)))
}
}
_unix_access :: proc(path: cstring, mask: int) -> int {
when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_access, uintptr(rawptr(path)), uintptr(mask)))
} else { // NOTE: arm64 does not have access
return int(intrinsics.syscall(unix.SYS_faccessat, uintptr(AT_FDCWD), uintptr(rawptr(path)), uintptr(mask)))
}
}
_unix_getcwd :: proc(buf: rawptr, size: uint) -> int {
return int(intrinsics.syscall(unix.SYS_getcwd, uintptr(buf), uintptr(size)))
}
_unix_chdir :: proc(path: cstring) -> int {
return int(intrinsics.syscall(unix.SYS_chdir, uintptr(rawptr(path))))
}
_unix_rename :: proc(old, new: cstring) -> int {
when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_rename, uintptr(rawptr(old)), uintptr(rawptr(new))))
} else { // NOTE: arm64 does not have rename
return int(intrinsics.syscall(unix.SYS_renameat, uintptr(AT_FDCWD), uintptr(rawptr(old)), uintptr(rawptr(new))))
}
}
_unix_unlink :: proc(path: cstring) -> int {
when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_unlink, uintptr(rawptr(path))))
} else { // NOTE: arm64 does not have unlink
return int(intrinsics.syscall(unix.SYS_unlinkat, uintptr(AT_FDCWD), uintptr(rawptr(path), 0)))
}
}
_unix_rmdir :: proc(path: cstring) -> int {
when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_rmdir, uintptr(rawptr(path))))
} else { // NOTE: arm64 does not have rmdir
return int(intrinsics.syscall(unix.SYS_unlinkat, uintptr(AT_FDCWD), uintptr(rawptr(path)), AT_REMOVEDIR))
}
}
_unix_mkdir :: proc(path: cstring, mode: u32) -> int {
when ODIN_ARCH != "arm64" {
return int(intrinsics.syscall(unix.SYS_mkdir, uintptr(rawptr(path)), uintptr(mode)))
} else { // NOTE: arm64 does not have mkdir
return int(intrinsics.syscall(unix.SYS_mkdirat, uintptr(AT_FDCWD), uintptr(rawptr(path)), uintptr(mode)))
}
}
foreign libc {
@(link_name="__errno_location") __errno_location :: proc() -> ^int ---
@(link_name="open") _unix_open :: proc(path: cstring, flags: c.int, mode: c.int) -> Handle ---
@(link_name="close") _unix_close :: proc(fd: Handle) -> c.int ---
@(link_name="read") _unix_read :: proc(fd: Handle, buf: rawptr, size: c.size_t) -> c.ssize_t ---
@(link_name="write") _unix_write :: proc(fd: Handle, buf: rawptr, size: c.size_t) -> c.ssize_t ---
@(link_name="lseek64") _unix_seek :: proc(fd: Handle, offset: i64, whence: c.int) -> i64 ---
@(link_name="gettid") _unix_gettid :: proc() -> u64 ---
@(link_name="getpagesize") _unix_getpagesize :: proc() -> c.int ---
@(link_name="stat64") _unix_stat :: proc(path: cstring, stat: ^OS_Stat) -> c.int ---
@(link_name="lstat") _unix_lstat :: proc(path: cstring, stat: ^OS_Stat) -> c.int ---
@(link_name="fstat") _unix_fstat :: proc(fd: Handle, stat: ^OS_Stat) -> c.int ---
@(link_name="fdopendir") _unix_fdopendir :: proc(fd: Handle) -> Dir ---
@(link_name="closedir") _unix_closedir :: proc(dirp: Dir) -> c.int ---
@(link_name="rewinddir") _unix_rewinddir :: proc(dirp: Dir) ---
@(link_name="readdir_r") _unix_readdir_r :: proc(dirp: Dir, entry: ^Dirent, result: ^^Dirent) -> c.int ---
@(link_name="readlink") _unix_readlink :: proc(path: cstring, buf: ^byte, bufsiz: c.size_t) -> c.ssize_t ---
@(link_name="access") _unix_access :: proc(path: cstring, mask: c.int) -> c.int ---
@(link_name="malloc") _unix_malloc :: proc(size: c.size_t) -> rawptr ---
@(link_name="calloc") _unix_calloc :: proc(num, size: c.size_t) -> rawptr ---
@(link_name="free") _unix_free :: proc(ptr: rawptr) ---
@(link_name="realloc") _unix_realloc :: proc(ptr: rawptr, size: c.size_t) -> rawptr ---
@(link_name="getenv") _unix_getenv :: proc(cstring) -> cstring ---
@(link_name="getcwd") _unix_getcwd :: proc(buf: cstring, len: c.size_t) -> cstring ---
@(link_name="chdir") _unix_chdir :: proc(buf: cstring) -> c.int ---
@(link_name="realpath") _unix_realpath :: proc(path: cstring, resolved_path: rawptr) -> rawptr ---
@(link_name="exit") _unix_exit :: proc(status: c.int) -> ! ---
@@ -308,51 +417,57 @@ is_path_separator :: proc(r: rune) -> bool {
return r == '/'
}
// determine errno from syscall return value
@private
_get_errno :: proc(res: int) -> Errno {
if res < 0 && res > -4096 {
return Errno(-res)
}
return 0
}
// get errno from libc
get_last_error :: proc() -> int {
return __errno_location()^
}
open :: proc(path: string, flags: int = O_RDONLY, mode: int = 0) -> (Handle, Errno) {
cstr := strings.clone_to_cstring(path)
handle := _unix_open(cstr, c.int(flags), c.int(mode))
delete(cstr)
if handle == -1 {
return INVALID_HANDLE, Errno(get_last_error())
handle := _unix_open(cstr, flags, mode)
defer delete(cstr)
if handle < 0 {
return INVALID_HANDLE, _get_errno(int(handle))
}
return handle, ERROR_NONE
}
close :: proc(fd: Handle) -> Errno {
result := _unix_close(fd)
if result == -1 {
return Errno(get_last_error())
}
return ERROR_NONE
return _get_errno(_unix_close(fd))
}
read :: proc(fd: Handle, data: []byte) -> (int, Errno) {
bytes_read := _unix_read(fd, &data[0], c.size_t(len(data)))
if bytes_read == -1 {
return -1, Errno(get_last_error())
if bytes_read < 0 {
return -1, _get_errno(bytes_read)
}
return int(bytes_read), ERROR_NONE
return bytes_read, ERROR_NONE
}
write :: proc(fd: Handle, data: []byte) -> (int, Errno) {
if len(data) == 0 {
return 0, ERROR_NONE
}
bytes_written := _unix_write(fd, &data[0], c.size_t(len(data)))
if bytes_written == -1 {
return -1, Errno(get_last_error())
bytes_written := _unix_write(fd, &data[0], uint(len(data)))
if bytes_written < 0 {
return -1, _get_errno(bytes_written)
}
return int(bytes_written), ERROR_NONE
}
seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {
res := _unix_seek(fd, offset, c.int(whence))
if res == -1 {
return -1, Errno(get_last_error())
res := _unix_seek(fd, offset, whence)
if res < 0 {
return -1, _get_errno(int(res))
}
return res, ERROR_NONE
}
@@ -365,6 +480,75 @@ file_size :: proc(fd: Handle) -> (i64, Errno) {
return max(s.size, 0), ERROR_NONE
}
rename :: proc(old_path, new_path: string) -> Errno {
old_path_cstr := strings.clone_to_cstring(old_path, context.temp_allocator)
new_path_cstr := strings.clone_to_cstring(new_path, context.temp_allocator)
return _get_errno(_unix_rename(old_path_cstr, new_path_cstr))
}
remove :: proc(path: string) -> Errno {
path_cstr := strings.clone_to_cstring(path, context.temp_allocator)
return _get_errno(_unix_unlink(path_cstr))
}
make_directory :: proc(path: string, mode: u32 = 0o775) -> Errno {
path_cstr := strings.clone_to_cstring(path, context.temp_allocator)
return _get_errno(_unix_mkdir(path_cstr, mode))
}
remove_directory :: proc(path: string) -> Errno {
path_cstr := strings.clone_to_cstring(path, context.temp_allocator)
return _get_errno(_unix_rmdir(path_cstr))
}
is_file_handle :: proc(fd: Handle) -> bool {
s, err := _fstat(fd)
if err != ERROR_NONE {
return false
}
return S_ISREG(s.mode)
}
is_file_path :: proc(path: string, follow_links: bool = true) -> bool {
s: OS_Stat
err: Errno
if follow_links {
s, err = _stat(path)
} else {
s, err = _lstat(path)
}
if err != ERROR_NONE {
return false
}
return S_ISREG(s.mode)
}
is_dir_handle :: proc(fd: Handle) -> bool {
s, err := _fstat(fd)
if err != ERROR_NONE {
return false
}
return S_ISDIR(s.mode)
}
is_dir_path :: proc(path: string, follow_links: bool = true) -> bool {
s: OS_Stat
err: Errno
if follow_links {
s, err = _stat(path)
} else {
s, err = _lstat(path)
}
if err != ERROR_NONE {
return false
}
return S_ISDIR(s.mode)
}
is_file :: proc {is_file_path, is_file_handle}
is_dir :: proc {is_dir_path, is_dir_handle}
// NOTE(bill): Uses startup to initialize it
@@ -401,8 +585,8 @@ _stat :: proc(path: string) -> (OS_Stat, Errno) {
s: OS_Stat
result := _unix_stat(cstr, &s)
if result == -1 {
return s, Errno(get_last_error())
if result < 0 {
return s, _get_errno(result)
}
return s, ERROR_NONE
}
@@ -414,8 +598,8 @@ _lstat :: proc(path: string) -> (OS_Stat, Errno) {
s: OS_Stat
result := _unix_lstat(cstr, &s)
if result == -1 {
return s, Errno(get_last_error())
if result < 0 {
return s, _get_errno(result)
}
return s, ERROR_NONE
}
@@ -424,8 +608,8 @@ _lstat :: proc(path: string) -> (OS_Stat, Errno) {
_fstat :: proc(fd: Handle) -> (OS_Stat, Errno) {
s: OS_Stat
result := _unix_fstat(fd, &s)
if result == -1 {
return s, Errno(get_last_error())
if result < 0 {
return s, _get_errno(result)
}
return s, ERROR_NONE
}
@@ -530,9 +714,9 @@ absolute_path_from_relative :: proc(rel: string) -> (path: string, err: Errno) {
access :: proc(path: string, mask: int) -> (bool, Errno) {
cstr := strings.clone_to_cstring(path)
defer delete(cstr)
result := _unix_access(cstr, c.int(mask))
if result == -1 {
return false, Errno(get_last_error())
result := _unix_access(cstr, mask)
if result < 0 {
return false, _get_errno(result)
}
return true, ERROR_NONE
}
@@ -567,11 +751,12 @@ get_current_directory :: proc() -> string {
page_size := get_page_size()
buf := make([dynamic]u8, page_size)
for {
#no_bounds_check cwd := _unix_getcwd(cstring(&buf[0]), c.size_t(len(buf)))
if cwd != nil {
return string(cwd)
#no_bounds_check res := _unix_getcwd(&buf[0], uint(len(buf)))
if res >= 0 {
return strings.string_from_nul_terminated_ptr(&buf[0], len(buf))
}
if Errno(get_last_error()) != ERANGE {
if _get_errno(res) != ERANGE {
return ""
}
resize(&buf, len(buf)+page_size)
@@ -582,8 +767,8 @@ get_current_directory :: proc() -> string {
set_current_directory :: proc(path: string) -> (err: Errno) {
cstr := strings.clone_to_cstring(path, context.temp_allocator)
res := _unix_chdir(cstr)
if res == -1 {
return Errno(get_last_error())
if res < 0 {
return _get_errno(res)
}
return ERROR_NONE
}