99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
|
/************************************************************
|
||
|
|
* usleep.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
||
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
*
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in
|
||
|
|
* the documentation and/or other materials provided with the
|
||
|
|
* distribution.
|
||
|
|
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
|
||
|
|
* used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Included Files
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <signal.h>
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Definitions
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Private Type Declarations
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Global Variables
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Private Variables
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Private Function Prototypes
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Public Functions
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
/************************************************************
|
||
|
|
* Function: usleep
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* BSD version as typically declared in unistd.h. suleep()
|
||
|
|
* is a simple application of sigtimedwait.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
* seconds
|
||
|
|
*
|
||
|
|
* Returned Value:
|
||
|
|
* None
|
||
|
|
*
|
||
|
|
* Assumptions:
|
||
|
|
*
|
||
|
|
************************************************************/
|
||
|
|
|
||
|
|
void usleep(unsigned long usec)
|
||
|
|
{
|
||
|
|
sigset_t set;
|
||
|
|
struct timespec ts;
|
||
|
|
struct siginfo value;
|
||
|
|
|
||
|
|
if (usec)
|
||
|
|
{
|
||
|
|
(void)sigemptyset(&set);
|
||
|
|
ts.tv_sec = usec / 1000000;
|
||
|
|
ts.tv_nsec = usec % 1000;
|
||
|
|
(void)sigtimedwait(&set, &value, &ts);
|
||
|
|
}
|
||
|
|
}
|