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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "../curl_setup.h"
#ifndef HAVE_SELECT
#error "We cannot compile without select() support."
#endif
#include <limits.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#elif defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#ifdef MSDOS
#include <dos.h> /* delay() */
#endif
#include "timediff.h"
#include "wait.h"
/*
* Internal function used for waiting a specific amount of ms in
* Curl_socket_check() and Curl_poll() when no file descriptor is provided to
* wait on, just being used to delay execution. Winsock select() and poll()
* timeout mechanisms need a valid socket descriptor in a not null file
* descriptor set to work. Waiting indefinitely with this function is not
* allowed, a zero or negative timeout value will return immediately. Timeout
* resolution, accuracy, as well as maximum supported value is system
* dependent, neither factor is a critical issue for the intended use of this
* function in the library.
*
* Return values:
* -1 = system call error, or invalid timeout value
* 0 = specified timeout has elapsed, or interrupted
*/
int curlx_wait_ms(timediff_t timeout_ms)
{
int r = 0;
if(!timeout_ms)
return 0;
if(timeout_ms < 0) {
SET_SOCKERRNO(SOCKEINVAL);
return -1;
}
#ifdef MSDOS
delay((unsigned int)timeout_ms);
#elif defined(_WIN32)
/* prevent overflow, timeout_ms is typecast to ULONG/DWORD. */
#if TIMEDIFF_T_MAX >= ULONG_MAX
if(timeout_ms >= ULONG_MAX)
timeout_ms = ULONG_MAX-1;
/* do not use ULONG_MAX, because that is equal to INFINITE */
#endif
Sleep((DWORD)timeout_ms);
#else
/* avoid using poll() for this since it behaves incorrectly with no sockets
on Apple operating systems */
{
struct timeval pending_tv;
r = select(0, NULL, NULL, NULL, curlx_mstotv(&pending_tv, timeout_ms));
}
#endif /* _WIN32 */
if(r) {
if((r == -1) && (SOCKERRNO == SOCKEINTR))
/* make EINTR from select or poll not a "lethal" error */
r = 0;
else
r = -1;
}
return r;
}
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