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VFS: select function's timeout is now POSIX compliant

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`select` function will now round up the timeout passed as a parameter (if any).
It  makes it POSIX compliant.

* Closes https://github.com/espressif/esp-idf/issues/7514
This commit is contained in:
Omar Chebib 2021-09-28 19:12:29 +08:00
parent a4ced2bf55
commit 53daf3dbbf
2 changed files with 20 additions and 29 deletions
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21
components/vfs/include/esp_vfs.h
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@ -1,16 +1,8 @@
// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __ESP_VFS_H__
#define __ESP_VFS_H__
@ -383,7 +375,8 @@ int esp_vfs_utime(const char *path, const struct utimbuf *times);
* @param timeout If not NULL, then points to timeval structure which
* specifies the time period after which the functions should
* time-out and return. If it is NULL, then the function will
* not time-out.
* not time-out. Note that the timeout period is rounded up to
* the system tick and incremented by one.
*
* @return The number of descriptors set in the descriptor sets, or -1
* when an error (specified by errno) have occurred.

28
components/vfs/vfs.c
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@ -1,16 +1,8 @@
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
@ -1000,8 +992,14 @@ int esp_vfs_select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds
TickType_t ticks_to_wait = portMAX_DELAY;
if (timeout) {
uint32_t timeout_ms = timeout->tv_sec * 1000 + timeout->tv_usec / 1000;
ticks_to_wait = timeout_ms / portTICK_PERIOD_MS;
uint32_t timeout_ms = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
/* Round up the number of ticks.
* Not only we need to round up the number of ticks, but we also need to add 1.
* Indeed, `select` function shall wait for AT LEAST timeout, but on FreeRTOS,
* if we specify a timeout of 1 tick to `xSemaphoreTake`, it will take AT MOST
* 1 tick before triggering a timeout. Thus, we need to pass 2 ticks as a timeout
* to `xSemaphoreTake`. */
ticks_to_wait = ((timeout_ms + portTICK_PERIOD_MS - 1) / portTICK_PERIOD_MS) + 1;
ESP_LOGD(TAG, "timeout is %dms", timeout_ms);
}
ESP_LOGD(TAG, "waiting without calling socket_select");