105 lines
2.3 KiB
C++
105 lines
2.3 KiB
C++
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// posix.cc -- Helper functions for POSIX-flavored OSs.
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/* Copyright (C) 2000 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include "posix.h"
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#include <errno.h>
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#if defined (ECOS)
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extern "C" unsigned long long _clock (void);
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#endif
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// gettimeofday implementation.
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void
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_Jv_gettimeofday (struct timeval *tv)
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{
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#if defined (HAVE_GETTIMEOFDAY)
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gettimeofday (tv, NULL);
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#elif defined (HAVE_TIME)
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tv->tv_sec = time (NULL);
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tv->tv_usec = 0;
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#elif defined (HAVE_FTIME)
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struct timeb t;
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ftime (&t);
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tv->tv_sec = t.time;
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tv->tv_usec = t.millitm * 1000;
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#elif defined (ECOS)
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// FIXME.
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tv->tv_sec = _clock () / 1000;
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tv->tv_usec = 0;
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#else
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// In the absence of any function, time remains forever fixed.
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tv->tv_sec = 23;
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tv->tv_usec = 0;
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#endif
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}
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// A wrapper for select() which ignores EINTR.
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int
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_Jv_select (int n, fd_set *readfds, fd_set *writefds,
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fd_set *exceptfds, struct timeval *timeout)
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{
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#ifdef HAVE_SELECT
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// If we have a timeout, compute the absolute ending time.
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struct timeval end, delay;
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if (timeout)
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{
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_Jv_gettimeofday (&end);
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end.tv_usec += timeout->tv_usec;
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if (end.tv_usec >= 1000000)
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{
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++end.tv_sec;
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end.tv_usec -= 1000000;
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}
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end.tv_sec += timeout->tv_sec;
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delay = *timeout;
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}
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else
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{
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// Placate compiler.
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delay.tv_sec = delay.tv_usec = 0;
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}
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while (1)
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{
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int r = select (n, readfds, writefds, exceptfds,
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timeout ? &delay : NULL);
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if (r != -1 || errno != EINTR)
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return r;
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struct timeval after;
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if (timeout)
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{
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_Jv_gettimeofday (&after);
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// Now compute new timeout argument.
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delay.tv_usec = end.tv_usec - after.tv_usec;
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delay.tv_sec = end.tv_sec - after.tv_sec;
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if (delay.tv_usec < 0)
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{
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--delay.tv_sec;
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delay.tv_usec += 1000000;
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}
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if (delay.tv_sec < 0)
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{
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// We assume that the user wants a valid select() call
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// more than precise timing. So if we get a series of
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// EINTR we just keep trying with delay 0 until we get a
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// valid result.
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delay.tv_sec = 0;
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}
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}
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}
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#else /* HAVE_SELECT */
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return 0;
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#endif
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}
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