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circuitpython/extmod/vfs_posix_file.c
stephanelsmith db06041d59 extmod/vfs_posix_file: Implement sys.std*.buffer objects. 
Add the buffer attribute to sys.stdin, sys.stdout and sys.stderr.  This
provides raw access to underlying stdio streams for the unix port (and
others that use VfsPosix).

Signed-off-by: stephanelsmith <stephane.smith@titansensor.com>
2023-09-01 17:39:38 +10:00

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2018 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/mphal.h"
#include "py/mpthread.h"
#include "py/runtime.h"
#include "py/stream.h"
#include "extmod/vfs_posix.h"
#if MICROPY_VFS_POSIX
#include <fcntl.h>
#include <unistd.h>
#ifdef _WIN32
#define fsync _commit
#else
#include <poll.h>
#endif
typedef struct _mp_obj_vfs_posix_file_t {
mp_obj_base_t base;
int fd;
} mp_obj_vfs_posix_file_t;
#if MICROPY_CPYTHON_COMPAT
STATIC void check_fd_is_open(const mp_obj_vfs_posix_file_t *o) {
if (o->fd < 0) {
mp_raise_ValueError(MP_ERROR_TEXT("I/O operation on closed file"));
}
}
#else
#define check_fd_is_open(o)
#endif
STATIC void vfs_posix_file_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_vfs_posix_file_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "<io.%s %d>", mp_obj_get_type_str(self_in), self->fd);
}
mp_obj_t mp_vfs_posix_file_open(const mp_obj_type_t *type, mp_obj_t file_in, mp_obj_t mode_in) {
mp_obj_vfs_posix_file_t *o = m_new_obj_with_finaliser(mp_obj_vfs_posix_file_t);
const char *mode_s = mp_obj_str_get_str(mode_in);
int mode_rw = 0, mode_x = 0;
while (*mode_s) {
switch (*mode_s++) {
case 'r':
mode_rw = O_RDONLY;
break;
case 'w':
mode_rw = O_WRONLY;
mode_x = O_CREAT | O_TRUNC;
break;
case 'a':
mode_rw = O_WRONLY;
mode_x = O_CREAT | O_APPEND;
break;
case '+':
mode_rw = O_RDWR;
break;
case 'b':
type = &mp_type_vfs_posix_fileio;
break;
case 't':
type = &mp_type_vfs_posix_textio;
break;
}
}
o->base.type = type;
mp_obj_t fid = file_in;
if (mp_obj_is_small_int(fid)) {
o->fd = MP_OBJ_SMALL_INT_VALUE(fid);
return MP_OBJ_FROM_PTR(o);
}
const char *fname = mp_obj_str_get_str(fid);
int fd;
MP_HAL_RETRY_SYSCALL(fd, open(fname, mode_x | mode_rw, 0644), mp_raise_OSError(err));
o->fd = fd;
return MP_OBJ_FROM_PTR(o);
}
STATIC mp_obj_t vfs_posix_file_fileno(mp_obj_t self_in) {
mp_obj_vfs_posix_file_t *self = MP_OBJ_TO_PTR(self_in);
check_fd_is_open(self);
return MP_OBJ_NEW_SMALL_INT(self->fd);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(vfs_posix_file_fileno_obj, vfs_posix_file_fileno);
STATIC mp_uint_t vfs_posix_file_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
mp_obj_vfs_posix_file_t *o = MP_OBJ_TO_PTR(o_in);
check_fd_is_open(o);
ssize_t r;
MP_HAL_RETRY_SYSCALL(r, read(o->fd, buf, size), {
*errcode = err;
return MP_STREAM_ERROR;
});
return (mp_uint_t)r;
}
STATIC mp_uint_t vfs_posix_file_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
mp_obj_vfs_posix_file_t *o = MP_OBJ_TO_PTR(o_in);
check_fd_is_open(o);
#if MICROPY_PY_OS_DUPTERM
if (o->fd <= STDERR_FILENO) {
mp_hal_stdout_tx_strn(buf, size);
return size;
}
#endif
ssize_t r;
MP_HAL_RETRY_SYSCALL(r, write(o->fd, buf, size), {
*errcode = err;
return MP_STREAM_ERROR;
});
return (mp_uint_t)r;
}
STATIC mp_uint_t vfs_posix_file_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
mp_obj_vfs_posix_file_t *o = MP_OBJ_TO_PTR(o_in);
if (request != MP_STREAM_CLOSE) {
check_fd_is_open(o);
}
switch (request) {
case MP_STREAM_FLUSH: {
int ret;
// fsync(stdin/stdout/stderr) may fail with EINVAL (or ENOTSUP on macos),
// but don't propagate that error out. Because data is not buffered by
// us, and stdin/out/err.flush() should just be a no-op.
#ifdef __APPLE__
#define VFS_POSIX_STREAM_STDIO_ERR_CATCH (err == EINVAL || err == ENOTSUP)
#else
#define VFS_POSIX_STREAM_STDIO_ERR_CATCH (err == EINVAL)
#endif
MP_HAL_RETRY_SYSCALL(ret, fsync(o->fd), {
if (VFS_POSIX_STREAM_STDIO_ERR_CATCH
&& (o->fd == STDIN_FILENO || o->fd == STDOUT_FILENO || o->fd == STDERR_FILENO)) {
return 0;
}
*errcode = err;
return MP_STREAM_ERROR;
});
return 0;
}
case MP_STREAM_SEEK: {
struct mp_stream_seek_t *s = (struct mp_stream_seek_t *)arg;
MP_THREAD_GIL_EXIT();
off_t off = lseek(o->fd, s->offset, s->whence);
MP_THREAD_GIL_ENTER();
if (off == (off_t)-1) {
*errcode = errno;
return MP_STREAM_ERROR;
}
s->offset = off;
return 0;
}
case MP_STREAM_CLOSE:
if (o->fd >= 0) {
MP_THREAD_GIL_EXIT();
close(o->fd);
MP_THREAD_GIL_ENTER();
}
o->fd = -1;
return 0;
case MP_STREAM_GET_FILENO:
return o->fd;
#if MICROPY_PY_SELECT && !MICROPY_PY_SELECT_POSIX_OPTIMISATIONS
case MP_STREAM_POLL: {
#ifdef _WIN32
mp_raise_NotImplementedError(MP_ERROR_TEXT("poll on file not available on win32"));
#else
mp_uint_t ret = 0;
uint8_t pollevents = 0;
if (arg & MP_STREAM_POLL_RD) {
pollevents |= POLLIN;
}
if (arg & MP_STREAM_POLL_WR) {
pollevents |= POLLOUT;
}
struct pollfd pfd = { .fd = o->fd, .events = pollevents };
if (poll(&pfd, 1, 0) > 0) {
if (pfd.revents & POLLIN) {
ret |= MP_STREAM_POLL_RD;
}
if (pfd.revents & POLLOUT) {
ret |= MP_STREAM_POLL_WR;
}
if (pfd.revents & POLLERR) {
ret |= MP_STREAM_POLL_ERR;
}
if (pfd.revents & POLLHUP) {
ret |= MP_STREAM_POLL_HUP;
}
if (pfd.revents & POLLNVAL) {
ret |= MP_STREAM_POLL_NVAL;
}
}
return ret;
#endif
}
#endif
default:
*errcode = EINVAL;
return MP_STREAM_ERROR;
}
}
STATIC const mp_rom_map_elem_t vfs_posix_rawfile_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_fileno), MP_ROM_PTR(&vfs_posix_file_fileno_obj) },
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
{ MP_ROM_QSTR(MP_QSTR_readlines), MP_ROM_PTR(&mp_stream_unbuffered_readlines_obj) },
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_seek), MP_ROM_PTR(&mp_stream_seek_obj) },
{ MP_ROM_QSTR(MP_QSTR_tell), MP_ROM_PTR(&mp_stream_tell_obj) },
{ MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&mp_stream_close_obj) },
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mp_stream_close_obj) },
{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&mp_stream___exit___obj) },
};
STATIC MP_DEFINE_CONST_DICT(vfs_posix_rawfile_locals_dict, vfs_posix_rawfile_locals_dict_table);
STATIC const mp_stream_p_t vfs_posix_fileio_stream_p = {
.read = vfs_posix_file_read,
.write = vfs_posix_file_write,
.ioctl = vfs_posix_file_ioctl,
};
MP_DEFINE_CONST_OBJ_TYPE(
mp_type_vfs_posix_fileio,
MP_QSTR_FileIO,
MP_TYPE_FLAG_ITER_IS_STREAM,
print, vfs_posix_file_print,
protocol, &vfs_posix_fileio_stream_p,
locals_dict, &vfs_posix_rawfile_locals_dict
);
STATIC const mp_stream_p_t vfs_posix_textio_stream_p = {
.read = vfs_posix_file_read,
.write = vfs_posix_file_write,
.ioctl = vfs_posix_file_ioctl,
.is_text = true,
};
#if MICROPY_PY_SYS_STDIO_BUFFER
const mp_obj_vfs_posix_file_t mp_sys_stdin_buffer_obj = {{&mp_type_vfs_posix_fileio}, STDIN_FILENO};
const mp_obj_vfs_posix_file_t mp_sys_stdout_buffer_obj = {{&mp_type_vfs_posix_fileio}, STDOUT_FILENO};
const mp_obj_vfs_posix_file_t mp_sys_stderr_buffer_obj = {{&mp_type_vfs_posix_fileio}, STDERR_FILENO};
// Forward declarations.
const mp_obj_vfs_posix_file_t mp_sys_stdin_obj;
const mp_obj_vfs_posix_file_t mp_sys_stdout_obj;
const mp_obj_vfs_posix_file_t mp_sys_stderr_obj;
STATIC void vfs_posix_textio_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
if (dest[0] != MP_OBJ_NULL) {
// These objects are read-only.
return;
}
if (attr == MP_QSTR_buffer) {
// Implement the `buffer` attribute only on std{in,out,err} instances.
if (MP_OBJ_TO_PTR(self_in) == &mp_sys_stdin_obj) {
dest[0] = MP_OBJ_FROM_PTR(&mp_sys_stdin_buffer_obj);
return;
}
if (MP_OBJ_TO_PTR(self_in) == &mp_sys_stdout_obj) {
dest[0] = MP_OBJ_FROM_PTR(&mp_sys_stdout_buffer_obj);
return;
}
if (MP_OBJ_TO_PTR(self_in) == &mp_sys_stderr_obj) {
dest[0] = MP_OBJ_FROM_PTR(&mp_sys_stderr_buffer_obj);
return;
}
}
// Any other attribute - forward to locals dict.
dest[1] = MP_OBJ_SENTINEL;
};
#define VFS_POSIX_TEXTIO_TYPE_ATTR attr, vfs_posix_textio_attr,
#else
#define VFS_POSIX_TEXTIO_TYPE_ATTR
#endif // MICROPY_PY_SYS_STDIO_BUFFER
MP_DEFINE_CONST_OBJ_TYPE(
mp_type_vfs_posix_textio,
MP_QSTR_TextIOWrapper,
MP_TYPE_FLAG_ITER_IS_STREAM,
print, vfs_posix_file_print,
protocol, &vfs_posix_textio_stream_p,
VFS_POSIX_TEXTIO_TYPE_ATTR
locals_dict, &vfs_posix_rawfile_locals_dict
);
const mp_obj_vfs_posix_file_t mp_sys_stdin_obj = {{&mp_type_vfs_posix_textio}, STDIN_FILENO};
const mp_obj_vfs_posix_file_t mp_sys_stdout_obj = {{&mp_type_vfs_posix_textio}, STDOUT_FILENO};
const mp_obj_vfs_posix_file_t mp_sys_stderr_obj = {{&mp_type_vfs_posix_textio}, STDERR_FILENO};
#endif // MICROPY_VFS_POSIX
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