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/* $OpenBSD: lib_twait.c,v 1.3 1997/12/03 05:21:38 millert Exp $ */
/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
/*
** lib_twait.c
**
** The routine _nc_timed_wait().
**
** (This file was originally written by Eric Raymond; however except for
** comments, none of the original code remains - T.Dickey).
*/
#include <curses.priv.h>
#if USE_FUNC_POLL
#include <stropts.h>
#include <poll.h>
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#elif HAVE_SELECT
#if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
#include <sys/time.h>
#endif
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif
MODULE_ID("Id: lib_twait.c,v 1.26 1997/11/30 01:09:23 tom Exp $")
/*
* We want to define GOOD_SELECT if the last argument of select(2) is
* modified to indicate time left. The code will deal gracefully with
* the other case, this is just an optimization to reduce the number
* of system calls per input event.
*
* In general, expect System-V-like UNIXes to have this behavior and BSD-like
* ones to not have it. Check your manual page. If it doesn't explicitly
* say the last argument is modified, assume it's not.
*
* (We'd really like configure to autodetect this, but writing a proper test
* turns out to be hard.)
*/
#if HAVE_GETTIMEOFDAY
#if (defined(TRACE) && !HAVE_USLEEP) || ! GOOD_SELECT
static void _nc_gettime(struct timeval *tp)
{
gettimeofday(tp, (struct timezone *)0);
T(("time: %ld.%06ld", (long) tp->tv_sec, (long) tp->tv_usec));
}
#endif
#endif
#if !HAVE_USLEEP
int _nc_usleep(unsigned int usec)
{
int code;
struct timeval tval;
#if defined(TRACE) && HAVE_GETTIMEOFDAY
_nc_gettime(&tval);
#endif
#if USE_FUNC_POLL
{
struct pollfd fds[1];
code = poll(fds, 0, usec / 1000);
}
#elif HAVE_SELECT
tval.tv_sec = usec / 1000000;
tval.tv_usec = usec % 1000000;
code = select(0, NULL, NULL, NULL, &tval);
#endif
#if defined(TRACE) && HAVE_GETTIMEOFDAY
_nc_gettime(&tval);
#endif
return code;
}
#endif /* !HAVE_USLEEP */
/*
* Wait a specified number of milliseconds, returning nonzero if the timer
* didn't expire before there is activity on the specified file descriptors.
* The file-descriptors are specified by the mode:
* 0 - none (absolute time)
* 1 - ncurses' normal input-descriptor
* 2 - mouse descriptor, if any
* 3 - either input or mouse.
* We return a mask that corresponds to the mode (e.g., 2 for mouse activity).
*
* If the milliseconds given are -1, the wait blocks until activity on the
* descriptors.
*/
int _nc_timed_wait(int mode, int milliseconds, int *timeleft)
{
int fd;
int count = 0;
long whole_secs = milliseconds / 1000;
long micro_secs = (milliseconds % 1000) * 1000;
int result = 0;
struct timeval ntimeout;
#if USE_FUNC_POLL
struct pollfd fds[2];
#elif HAVE_SELECT
static fd_set set;
#endif
#if !GOOD_SELECT && HAVE_GETTIMEOFDAY
struct timeval starttime, returntime;
long delta;
_nc_gettime(&starttime);
#endif
if (milliseconds >= 0) {
ntimeout.tv_sec = whole_secs;
ntimeout.tv_usec = micro_secs;
} else {
ntimeout.tv_sec = 0;
ntimeout.tv_usec = 0;
}
T(("start twait: %lu.%06lu secs", (long) ntimeout.tv_sec, (long) ntimeout.tv_usec));
#ifdef HIDE_EINTR
/*
* The do loop tries to make it look like we have restarting signals,
* even if we don't.
*/
do {
#endif /* HIDE_EINTR */
#if !GOOD_SELECT && HAVE_GETTIMEOFDAY
retry:
#endif
count = 0;
#if USE_FUNC_POLL
if (mode & 1) {
fds[count].fd = SP->_ifd;
fds[count].events = POLLIN;
count++;
}
if ((mode & 2)
&& (fd = SP->_mouse_fd) >= 0) {
fds[count].fd = fd;
fds[count].events = POLLIN;
count++;
}
result = poll(fds, count, milliseconds);
#elif HAVE_SELECT
/*
* Some systems modify the fd_set arguments; do this in the
* loop.
*/
FD_ZERO(&set);
if (mode & 1) {
FD_SET(SP->_ifd, &set);
count = SP->_ifd + 1;
}
if ((mode & 2)
&& (fd = SP->_mouse_fd) >= 0) {
FD_SET(fd, &set);
count = max(fd, count) + 1;
}
errno = 0;
result = select(count, &set, NULL, NULL, milliseconds >= 0 ? &ntimeout : 0);
#endif
#if !GOOD_SELECT && HAVE_GETTIMEOFDAY
_nc_gettime(&returntime);
/* The contents of ntimeout aren't guaranteed after return from
* 'select()', so we disregard its contents. Also, note that
* on some systems, tv_sec and tv_usec are unsigned.
*/
ntimeout.tv_sec = whole_secs;
ntimeout.tv_usec = micro_secs;
#define DELTA(f) (long)ntimeout.f - (long)returntime.f + (long)starttime.f
delta = DELTA(tv_sec);
if (delta < 0)
delta = 0;
ntimeout.tv_sec = delta;
delta = DELTA(tv_usec);
while (delta < 0 && ntimeout.tv_sec != 0) {
ntimeout.tv_sec--;
delta += 1000000;
}
ntimeout.tv_usec = delta;
if (delta < 0)
ntimeout.tv_sec = ntimeout.tv_usec = 0;
/*
* If the timeout hasn't expired, and we've gotten no data,
* this is probably a system where 'select()' needs to be left
* alone so that it can complete. Make this process sleep,
* then come back for more.
*/
if (result == 0
&& (ntimeout.tv_sec != 0 || ntimeout.tv_usec > 100000)) {
napms(100);
goto retry;
}
#endif
#ifdef HIDE_EINTR
} while (result == -1 && errno == EINTR);
#endif
/* return approximate time left on the ntimeout, in milliseconds */
if (timeleft)
*timeleft = (ntimeout.tv_sec * 1000) + (ntimeout.tv_usec / 1000);
T(("end twait: returned %d (%d), remaining time %lu.%06lu secs (%d msec)",
result, errno,
(long) ntimeout.tv_sec, (long) ntimeout.tv_usec,
timeleft ? *timeleft : -1));
/*
* Both 'poll()' and 'select()' return the number of file descriptors
* that are active. Translate this back to the mask that denotes which
* file-descriptors, so that we don't need all of this system-specific
* code everywhere.
*/
if (result != 0) {
if (result > 0) {
result = 0;
#if USE_FUNC_POLL
for (count = 0; count < 2; count++) {
if ((mode & (1 << count))
&& (fds[count].revents & POLLIN)) {
result |= (1 << count);
count++;
}
}
#elif HAVE_SELECT
if ((mode & 2)
&& (fd = SP->_mouse_fd) >= 0
&& FD_ISSET(fd, &set))
result |= 2;
if ((mode & 1)
&& FD_ISSET(SP->_ifd, &set))
result |= 1;
#endif
}
else
result = 0;
}
return (result);
}
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