--- /dev/null
+/* Emulation for poll(2)
+ Contributed by Paolo Bonzini.
+
+ Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+
+ This file is part of gnulib.
+
+ gnulib is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1, or (at your option)
+ any later version.
+
+ gnulib is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with gnulib; see the file COPYING.LIB. If not, write to the Free
+ Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include "poll.h"
+#include <errno.h>
+#include <limits.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <unistd.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+
+#ifndef INFTIM
+#define INFTIM (-1)
+#endif
+
+#ifndef EOVERFLOW
+#define EOVERFLOW EINVAL
+#endif
+
+int
+poll (pfd, nfd, timeout)
+ struct pollfd *pfd;
+ nfds_t nfd;
+ int timeout;
+{
+ fd_set rfds, wfds, efds;
+ struct timeval tv, *ptv;
+ int maxfd, rc, happened;
+ nfds_t i;
+ char data[64];
+
+#ifdef _SC_OPEN_MAX
+ if (nfd > sysconf (_SC_OPEN_MAX))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+#else /* !_SC_OPEN_MAX */
+#ifdef OPEN_MAX
+ if (nfd > OPEN_MAX)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+#endif /* OPEN_MAX -- else, no check is needed */
+#endif /* !_SC_OPEN_MAX */
+
+ /* EFAULT is not necessary to implement, but let's do it in the
+ simplest case. */
+ if (!pfd)
+ {
+ errno = EFAULT;
+ return -1;
+ }
+
+ /* convert timeout number into a timeval structure */
+ ptv = &tv;
+ if (timeout >= 0)
+ {
+ /* return immediately or after timeout */
+ ptv->tv_sec = timeout / 1000;
+ ptv->tv_usec = (timeout % 1000) * 1000;
+ }
+ else if (timeout == INFTIM)
+ /* wait forever */
+ ptv = NULL;
+ else
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* create fd sets and determine max fd */
+ maxfd = -1;
+ FD_ZERO (&rfds);
+ FD_ZERO (&wfds);
+ FD_ZERO (&efds);
+ for (i = 0; i < nfd; i++)
+ {
+ if (pfd[i].fd < 0)
+ continue;
+
+ if (pfd[i].events & (POLLIN | POLLRDNORM))
+ FD_SET (pfd[i].fd, &rfds);
+
+ /* see select(2): "the only exceptional condition detectable
+ is out-of-band data received on a socket", hence we push
+ POLLWRBAND events onto wfds instead of efds. */
+ if (pfd[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND))
+ FD_SET (pfd[i].fd, &wfds);
+ if (pfd[i].events & (POLLPRI | POLLRDBAND))
+ FD_SET (pfd[i].fd, &efds);
+ if (pfd[i].fd >= maxfd
+ && (pfd[i].events & (POLLIN | POLLOUT | POLLPRI
+ | POLLRDNORM | POLLRDBAND
+ | POLLWRNORM | POLLWRBAND)))
+ {
+ maxfd = pfd[i].fd;
+ if (maxfd > FD_SETSIZE)
+ {
+ errno = EOVERFLOW;
+ return -1;
+ }
+ }
+ }
+
+ /* examine fd sets */
+ rc = select (maxfd + 1, &rfds, &wfds, &efds, ptv);
+
+ /* establish results */
+ if (rc > 0)
+ {
+ rc = 0;
+ for (i = 0; i < nfd; i++)
+ {
+ pfd[i].revents = 0;
+ if (pfd[i].fd < 0)
+ continue;
+
+ happened = 0;
+ if (FD_ISSET (pfd[i].fd, &rfds))
+ {
+ /* support for POLLHUP. An hung up descriptor does not
+ increase the return value! */
+ if (recv (pfd[i].fd, data, 64, MSG_PEEK) == -1)
+ {
+ if (errno == ESHUTDOWN || errno == ECONNRESET
+ || errno == ECONNABORTED || errno == ENETRESET)
+ pfd[i].revents |= POLLHUP;
+ }
+ else
+ happened |= POLLIN | POLLRDNORM;
+ }
+
+ if (FD_ISSET (pfd[i].fd, &wfds))
+ happened |= POLLOUT | POLLWRNORM | POLLWRBAND;
+
+ if (FD_ISSET (pfd[i].fd, &efds))
+ happened |= POLLPRI | POLLRDBAND;
+
+ pfd[i].revents |= pfd[i].events & happened;
+ rc += (happened > 0);
+ }
+ }
+
+ return rc;
+}
--- /dev/null
+/* Header for poll(2) emulation
+ Contributed by Paolo Bonzini.
+
+ Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+
+ This file is part of gnulib.
+
+ gnulib is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1, or (at your option)
+ any later version.
+
+ gnulib is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with gnulib; see the file COPYING.LIB. If not, write to the Free
+ Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ USA.
+ */
+
+#ifndef GNULIB_POLL_H
+#define GNULIB_POLL_H
+
+/* fake a poll(2) environment */
+#define POLLIN 0x0001 /* any readable data available */
+#define POLLPRI 0x0002 /* OOB/Urgent readable data */
+#define POLLOUT 0x0004 /* file descriptor is writeable */
+#define POLLERR 0x0008 /* some poll error occurred */
+#define POLLHUP 0x0010 /* file descriptor was "hung up" */
+#define POLLNVAL 0x0020 /* requested events "invalid" */
+#define POLLRDNORM 0x0040
+#define POLLRDBAND 0x0080
+#define POLLWRNORM 0x0100
+#define POLLWRBAND 0x0200
+
+struct pollfd
+{
+ int fd; /* which file descriptor to poll */
+ short events; /* events we are interested in */
+ short revents; /* events found on return */
+};
+
+typedef unsigned long nfds_t;
+
+extern int poll (struct pollfd *pfd, nfds_t nfd, int timeout);
+
+/* Define INFTIM only if doing so conforms to POSIX. */
+#if !defined (_POSIX_C_SOURCE) && !defined (_XOPEN_SOURCE)
+#define INFTIM (-1)
+#endif
+
+#endif
--- /dev/null
+# poll.m4 serial 1
+dnl Copyright (c) 2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License. As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of the program.
+
+AC_DEFUN([gl_FUNC_POLL],
+[
+ AC_CHECK_HEADERS(poll.h)
+ if test x$ac_cv_header_poll_h = xno; then
+ AC_CONFIG_LINKS([lib/poll.h:lib/poll_.h])
+ fi
+
+ AC_REPLACE_FUNCS(poll)
+ if test $ac_cv_func_poll = no; then
+ gl_PREREQ_POLL
+ fi
+])
+
+# Prerequisites of lib/poll.c.
+AC_DEFUN([gl_PREREQ_POLL],
+[
+ AC_REQUIRE([AC_HEADER_TIME])
+ AC_CHECK_HEADERS_ONCE(sys/time.h)
+])
projects / pspp / commitdiff