12a5a5cce9
Because the configured signo may have the default action(e.g. SIGPIPE), and then will generate the bad side effect before the caller wakeup. Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
272 lines
8.0 KiB
C
272 lines
8.0 KiB
C
/****************************************************************************
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* examples/oneshot/oneshot_main.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <time.h>
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#include <errno.h>
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#include <nuttx/timers/oneshot.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_EXAMPLES_ONESHOT_DEVNAME
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# define CONFIG_EXAMPLES_ONESHOT_DEVNAME "/dev/oneshot"
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#endif
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#ifndef CONFIG_EXAMPLES_ONESHOT_DELAY
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# define CONFIG_EXAMPLES_ONESHOT_DELAY 100000
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#endif
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#ifndef CONFIG_EXAMPLES_ONESHOT_SIGNO
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# define CONFIG_EXAMPLES_ONESHOT_SIGNO 13
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#endif
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/* For long delays that have to be broken into segments, some loss of
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* precision is expected due to interrupt and context switching overhead.
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* This inaccuracy will cause somewhat longer times than the time requested
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* due to this overhead. It might be possible to reduce this inaccuracy
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* some by (1) making this task very high priority so that it runs in a more
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* deterministic way, and (2) by subtracting a "fudge factor" to account for
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* time lost due to the overhead.
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*/
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#define FUDGE_FACTOR 10
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: oneshot_main
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****************************************************************************/
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static void show_usage(FAR const char *progname)
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{
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fprintf(stderr, "USAGE: %s [-d <usecs>] [<devname>]\n", progname);
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fprintf(stderr, "Where:\n");
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fprintf(stderr, "\t-d <usecs>:\n");
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fprintf(stderr, "\tSpecifies the oneshot delay in microseconds. Default %ld\n",
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(unsigned long)CONFIG_EXAMPLES_ONESHOT_DELAY);
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fprintf(stderr, "\t<devname>:\n");
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fprintf(stderr, "\tSpecifies the path to the oneshot driver. Default %s\n",
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CONFIG_EXAMPLES_ONESHOT_DEVNAME);
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exit(EXIT_FAILURE);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: oneshot_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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FAR const char *devname = CONFIG_EXAMPLES_ONESHOT_DEVNAME;
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unsigned long usecs = CONFIG_EXAMPLES_ONESHOT_DELAY;
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unsigned long secs;
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struct oneshot_start_s start;
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struct timespec ts;
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uint64_t maxus;
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sigset_t set;
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int ret;
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int fd;
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/* USAGE: nsh> oneshot [-d <usecs>] [<devname>] */
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if (argc > 1)
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{
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if (argc == 2)
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{
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/* FORM: nsh> oneshot [<devname>] */
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devname = argv[1];
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}
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else if (argc < 5)
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{
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/* FORM: nsh> oneshot [-d <usecs>] */
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if (strcmp(argv[1], "-d") != 0)
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{
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fprintf(stderr, "ERROR: Unrecognized option: %s\n", argv[1]);
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show_usage(argv[0]);
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}
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usecs = strtoul(argv[2], NULL, 10);
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if (argc == 4)
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{
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/* FORM: nsh> oneshot [-d <usecs>] [<devname>] */
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devname = argv[3];
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}
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}
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else
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{
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fprintf(stderr, "ERROR: Unsupported number of arguments: %d\n", argc);
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show_usage(argv[0]);
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}
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}
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/* Open the oneshot device */
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printf("Opening %s\n", devname);
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fd = open(devname, O_RDONLY);
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if (fd < 0)
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{
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fprintf(stderr, "ERROR: Failed to open %s: %d\n",
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devname, errno);
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return EXIT_FAILURE;
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}
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/* Get the maximum delay */
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ret = ioctl(fd, OSIOC_MAXDELAY, (unsigned long)((uintptr_t)&ts));
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: Failed to get the maximum delayl: %d\n",
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errno);
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close(fd);
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return EXIT_FAILURE;
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}
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maxus = (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000;
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printf("Maximum delay is %llu\n", maxus);
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/* Ignore the default signal action */
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signal(CONFIG_EXAMPLES_ONESHOT_SIGNO, SIG_IGN);
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/* Loop waiting until the full delay expires */
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while (usecs > 0)
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{
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/* Start the oneshot timer */
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sigemptyset(&set);
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sigaddset(&set, CONFIG_EXAMPLES_ONESHOT_SIGNO);
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if (usecs < maxus)
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{
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/* Wait for the remaining time */
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printf("Starting oneshot timer with delay %lu microseconds\n",
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usecs);
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start.pid = 0;
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secs = usecs / 1000000;
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usecs -= 1000000 * secs;
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start.ts.tv_sec = secs;
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start.ts.tv_nsec = usecs * 1000;
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start.event.sigev_notify = SIGEV_SIGNAL;
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start.event.sigev_signo = CONFIG_EXAMPLES_ONESHOT_SIGNO;
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start.event.sigev_value.sival_ptr = NULL;
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/* Zero usecs to terminate the loop */
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usecs = 0;
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}
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else
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{
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/* Wait for the maximum */
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printf("Starting oneshot timer with delay %llu microseconds\n",
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maxus);
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start.ts.tv_sec = ts.tv_sec;
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start.ts.tv_nsec = ts.tv_nsec;
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usecs -= maxus;
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#if FUDGE_FACTOR > 0
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if (usecs > FUDGE_FACTOR)
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{
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usecs -= FUDGE_FACTOR;
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}
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else
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{
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usecs = 0;
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}
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#endif
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}
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ret = ioctl(fd, OSIOC_START, (unsigned long)((uintptr_t)&start));
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: Failed to start the oneshot interval: %d\n",
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errno);
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close(fd);
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return EXIT_FAILURE;
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}
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/* Wait for the oneshot to fire */
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printf("Waiting...\n");
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ret = sigwaitinfo(&set, NULL);
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: sigwaitinfo failed: %d\n",
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errno);
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close(fd);
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return EXIT_FAILURE;
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}
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}
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/* Close the oneshot driver */
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printf("Finished\n");
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close(fd);
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return EXIT_SUCCESS;
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}
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