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-rw-r--r--libev/ev_select.c308
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diff --git a/libev/ev_select.c b/libev/ev_select.c
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+/*
+ * libev select fd activity backend
+ *
+ * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, 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 OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License ("GPL") version 2 or any later version,
+ * in which case the provisions of the GPL are applicable instead of
+ * the above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the BSD license, indicate your decision
+ * by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file under
+ * either the BSD or the GPL.
+ */
+
+#ifndef _WIN32
+/* for unix systems */
+# include <sys/select.h>
+# include <inttypes.h>
+#endif
+
+#ifndef EV_SELECT_USE_FD_SET
+# ifdef NFDBITS
+# define EV_SELECT_USE_FD_SET 0
+# else
+# define EV_SELECT_USE_FD_SET 1
+# endif
+#endif
+
+#if EV_SELECT_IS_WINSOCKET
+# undef EV_SELECT_USE_FD_SET
+# define EV_SELECT_USE_FD_SET 1
+# undef NFDBITS
+# define NFDBITS 0
+#endif
+
+#if !EV_SELECT_USE_FD_SET
+# define NFDBYTES (NFDBITS / 8)
+#endif
+
+#include <string.h>
+
+static void
+select_modify (EV_P_ int fd, int oev, int nev)
+{
+ if (oev == nev)
+ return;
+
+ {
+#if EV_SELECT_USE_FD_SET
+
+ #if EV_SELECT_IS_WINSOCKET
+ SOCKET handle = anfds [fd].handle;
+ #else
+ int handle = fd;
+ #endif
+
+ assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE));
+
+ /* FD_SET is broken on windows (it adds the fd to a set twice or more,
+ * which eventually leads to overflows). Need to call it only on changes.
+ */
+ #if EV_SELECT_IS_WINSOCKET
+ if ((oev ^ nev) & EV_READ)
+ #endif
+ if (nev & EV_READ)
+ FD_SET (handle, (fd_set *)vec_ri);
+ else
+ FD_CLR (handle, (fd_set *)vec_ri);
+
+ #if EV_SELECT_IS_WINSOCKET
+ if ((oev ^ nev) & EV_WRITE)
+ #endif
+ if (nev & EV_WRITE)
+ FD_SET (handle, (fd_set *)vec_wi);
+ else
+ FD_CLR (handle, (fd_set *)vec_wi);
+
+#else
+
+ int word = fd / NFDBITS;
+ fd_mask mask = 1UL << (fd % NFDBITS);
+
+ if (expect_false (vec_max <= word))
+ {
+ int new_max = word + 1;
+
+ vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
+ vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
+ vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
+ vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
+ #ifdef _WIN32
+ vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */
+ #endif
+
+ for (; vec_max < new_max; ++vec_max)
+ ((fd_mask *)vec_ri) [vec_max] =
+ ((fd_mask *)vec_wi) [vec_max] = 0;
+ }
+
+ ((fd_mask *)vec_ri) [word] |= mask;
+ if (!(nev & EV_READ))
+ ((fd_mask *)vec_ri) [word] &= ~mask;
+
+ ((fd_mask *)vec_wi) [word] |= mask;
+ if (!(nev & EV_WRITE))
+ ((fd_mask *)vec_wi) [word] &= ~mask;
+#endif
+ }
+}
+
+static void
+select_poll (EV_P_ ev_tstamp timeout)
+{
+ struct timeval tv;
+ int res;
+ int fd_setsize;
+
+ EV_RELEASE_CB;
+ tv.tv_sec = (long)timeout;
+ tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
+
+#if EV_SELECT_USE_FD_SET
+ fd_setsize = sizeof (fd_set);
+#else
+ fd_setsize = vec_max * NFDBYTES;
+#endif
+
+ memcpy (vec_ro, vec_ri, fd_setsize);
+ memcpy (vec_wo, vec_wi, fd_setsize);
+
+#ifdef _WIN32
+ /* pass in the write set as except set.
+ * the idea behind this is to work around a windows bug that causes
+ * errors to be reported as an exception and not by setting
+ * the writable bit. this is so uncontrollably lame.
+ */
+ memcpy (vec_eo, vec_wi, fd_setsize);
+ res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
+#elif EV_SELECT_USE_FD_SET
+ fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
+ res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
+#else
+ res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
+#endif
+ EV_ACQUIRE_CB;
+
+ if (expect_false (res < 0))
+ {
+ #if EV_SELECT_IS_WINSOCKET
+ errno = WSAGetLastError ();
+ #endif
+ #ifdef WSABASEERR
+ /* on windows, select returns incompatible error codes, fix this */
+ if (errno >= WSABASEERR && errno < WSABASEERR + 1000)
+ if (errno == WSAENOTSOCK)
+ errno = EBADF;
+ else
+ errno -= WSABASEERR;
+ #endif
+
+ #ifdef _WIN32
+ /* select on windows errornously returns EINVAL when no fd sets have been
+ * provided (this is documented). what microsoft doesn't tell you that this bug
+ * exists even when the fd sets _are_ provided, so we have to check for this bug
+ * here and emulate by sleeping manually.
+ * we also get EINVAL when the timeout is invalid, but we ignore this case here
+ * and assume that EINVAL always means: you have to wait manually.
+ */
+ if (errno == EINVAL)
+ {
+ ev_sleep (timeout);
+ return;
+ }
+ #endif
+
+ if (errno == EBADF)
+ fd_ebadf (EV_A);
+ else if (errno == ENOMEM && !syserr_cb)
+ fd_enomem (EV_A);
+ else if (errno != EINTR)
+ ev_syserr ("(libev) select");
+
+ return;
+ }
+
+#if EV_SELECT_USE_FD_SET
+
+ {
+ int fd;
+
+ for (fd = 0; fd < anfdmax; ++fd)
+ if (anfds [fd].events)
+ {
+ int events = 0;
+ #if EV_SELECT_IS_WINSOCKET
+ SOCKET handle = anfds [fd].handle;
+ #else
+ int handle = fd;
+ #endif
+
+ if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
+ if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
+ #ifdef _WIN32
+ if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE;
+ #endif
+
+ if (expect_true (events))
+ fd_event (EV_A_ fd, events);
+ }
+ }
+
+#else
+
+ {
+ int word, bit;
+ for (word = vec_max; word--; )
+ {
+ fd_mask word_r = ((fd_mask *)vec_ro) [word];
+ fd_mask word_w = ((fd_mask *)vec_wo) [word];
+ #ifdef _WIN32
+ word_w |= ((fd_mask *)vec_eo) [word];
+ #endif
+
+ if (word_r || word_w)
+ for (bit = NFDBITS; bit--; )
+ {
+ fd_mask mask = 1UL << bit;
+ int events = 0;
+
+ events |= word_r & mask ? EV_READ : 0;
+ events |= word_w & mask ? EV_WRITE : 0;
+
+ if (expect_true (events))
+ fd_event (EV_A_ word * NFDBITS + bit, events);
+ }
+ }
+ }
+
+#endif
+}
+
+int inline_size
+select_init (EV_P_ int flags)
+{
+ backend_fudge = 0.; /* posix says this is zero */
+ backend_modify = select_modify;
+ backend_poll = select_poll;
+
+#if EV_SELECT_USE_FD_SET
+ vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
+ vec_ro = ev_malloc (sizeof (fd_set));
+ vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
+ vec_wo = ev_malloc (sizeof (fd_set));
+ #ifdef _WIN32
+ vec_eo = ev_malloc (sizeof (fd_set));
+ #endif
+#else
+ vec_max = 0;
+ vec_ri = 0;
+ vec_ro = 0;
+ vec_wi = 0;
+ vec_wo = 0;
+ #ifdef _WIN32
+ vec_eo = 0;
+ #endif
+#endif
+
+ return EVBACKEND_SELECT;
+}
+
+void inline_size
+select_destroy (EV_P)
+{
+ ev_free (vec_ri);
+ ev_free (vec_ro);
+ ev_free (vec_wi);
+ ev_free (vec_wo);
+ #ifdef _WIN32
+ ev_free (vec_eo);
+ #endif
+}
+
+
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