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72 lines
2.3 KiB
Plaintext
72 lines
2.3 KiB
Plaintext
# poll.m4 serial 8
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dnl Copyright (c) 2003, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_POLL],
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[
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AC_CHECK_HEADERS([poll.h])
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if test "$ac_cv_header_poll_h" = no; then
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gl_cv_func_poll=no
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else
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AC_CHECK_FUNC([poll],
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[# Check whether poll() works on special files (like /dev/null) and
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# and ttys (like /dev/tty). On MacOS X 10.4.0 and AIX 5.3, it doesn't.
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AC_TRY_RUN([
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#include <fcntl.h>
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#include <poll.h>
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int main()
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{
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struct pollfd ufd;
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/* Try /dev/null for reading. */
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ufd.fd = open ("/dev/null", O_RDONLY);
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if (ufd.fd < 0)
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/* If /dev/null does not exist, it's not MacOS X nor AIX. */
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return 0;
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ufd.events = POLLIN;
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ufd.revents = 0;
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if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN))
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return 1;
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/* Try /dev/null for writing. */
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ufd.fd = open ("/dev/null", O_WRONLY);
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if (ufd.fd < 0)
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/* If /dev/null does not exist, it's not MacOS X nor AIX. */
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return 0;
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ufd.events = POLLOUT;
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ufd.revents = 0;
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if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT))
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return 1;
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/* Trying /dev/tty may be too environment dependent. */
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return 0;
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}],
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[gl_cv_func_poll=yes],
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[gl_cv_func_poll=no],
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[# When cross-compiling, assume that poll() works everywhere except on
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# MacOS X or AIX, regardless of its version.
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AC_EGREP_CPP([MacOSX], [
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#if (defined(__APPLE__) && defined(__MACH__)) || defined(_AIX)
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This is MacOSX or AIX
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#endif
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], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])])
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fi
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if test $gl_cv_func_poll = yes; then
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AC_DEFINE([HAVE_POLL], [1],
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[Define to 1 if you have the 'poll' function and it works.])
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POLL_H=
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else
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AC_LIBOBJ([poll])
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AC_DEFINE([poll], [rpl_poll],
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[Define to poll if the replacement function should be used.])
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gl_PREREQ_POLL
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POLL_H=poll.h
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fi
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AC_SUBST([POLL_H])
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])
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# Prerequisites of lib/poll.c.
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AC_DEFUN([gl_PREREQ_POLL],
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[
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AC_CHECK_HEADERS_ONCE([sys/ioctl.h sys/filio.h])
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])
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