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extmod/vfs_posix_file: Support MP_STREAM_POLL in vfs_posix_file_ioctl. 

Allows asyncio reading of sys.stdin when MICROPY_PY_USELECT is used in the
build configuration.
This commit is contained in:
Andrew Leech 2021-08-13 16:02:41 +10:00 committed by Damien George
parent ba940250a5
commit 2ceeabf180
1 changed files with 28 additions and 0 deletions
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28
extmod/vfs_posix_file.c
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@ -37,6 +37,8 @@
#ifdef _WIN32
#define fsync _commit
#else
#include <poll.h>
#endif
typedef struct _mp_obj_vfs_posix_file_t {
@ -206,6 +208,32 @@ STATIC mp_uint_t vfs_posix_file_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_
return 0;
case MP_STREAM_GET_FILENO:
return o->fd;
#if MICROPY_PY_USELECT
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;
}
}
return ret;
#endif
}
#endif
default:
*errcode = EINVAL;
return MP_STREAM_ERROR;