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annotate m4/poll.m4 @ 9209:5a0294ce5372

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Track CVS Autoconf on AC_USE_SYSTEM_EXTENSIONS. * m4/extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Update to CVS Autoconf definition. * modules/euidaccess (Depends-on): Add extensions, for AC_USE_SYSTEM_EXTENSIONS with autoconf <= 2.59. * modules/fnmatch (Depends-on): Likewise. * modules/getaddrinfo (Depends-on): Likewise. * modules/getdelim (Depends-on): Likewise. * modules/getline (Depends-on): Likewise. * modules/getsubopt (Depends-on): Likewise. * modules/gettext (Depends-on): Likewise. * modules/group-member (Depends-on): Likewise. * modules/mbchar (Depends-on): Likewise. * modules/memmem (Depends-on): Likewise. * modules/mempcpy (Depends-on): Likewise. * modules/memrchr (Depends-on): Likewise. * modules/pagealign_alloc (Depends-on): Likewise. * modules/readutmp (Depends-on): Likewise. * modules/stpcpy (Depends-on): Likewise. * modules/stpncpy (Depends-on): Likewise. * modules/strchrnul (Depends-on): Likewise. * modules/strndup (Depends-on): Likewise. * modules/strsep (Depends-on): Likewise. * modules/strverscmp (Depends-on): Likewise. * modules/vasprintf (Depends-on): Likewise. * modules/wcwidth (Depends-on): Likewise. * m4/euidaccess.m4 (gl_FUNC_EUIDACCESS): AC_GNU_SOURCE will be obsolete in Autoconf 2.62; use AC_USE_SYSTEM_EXTENSIONS instead. * m4/fnmatch.m4 (gl_FUNC_FNMATCH_GNU): Likewise. * m4/getaddrinfo.m4 (gl_PREREQ_GETADDR_INFO): Likewise. * m4/getdelim.m4 (gl_FUNC_GETDELIM): Likewise. * m4/getline.m4 (gl_FUNC_GETLINE): Likewise. * m4/getsubopt.m4 (gl_FUNC_GETSUBOPT): Likewise. * m4/glob.m4 (gl_PREREQ_GLOB): Likewise. * m4/group-member.m4 (gl_FUNC_GROUP_MEMBER): Likewise. * m4/mbchar.m4 (gl_MBCHAR): Likewise. * m4/memmem.m4 (gl_FUNC_MEMMEM): Likewise. * m4/mempcpy.m4 (gl_FUNC_MEMPCPY): Likewise. * m4/memrchr.m4 (gl_FUNC_MEMRCHR): Likewise. * m4/mmap-anon.m4 (gl_FUNC_MMAP_ANON): Likewise. * m4/pagealign_alloc.m4 (gl_PAGEALIGN_ALLOC): Likewise. * m4/readutmp.m4 (gl_READUTMP): Likewise. * m4/regex.m4 (gl_PREREQ_REGEX): Likewise. * m4/stpcpy.m4 (gl_FUNC_STPCPY): Likewise. * m4/stpncpy.m4 (gl_FUNC_STPNCPY): Likewise. * m4/strchrnul.m4 (gl_FUNC_STRCHRNUL): Likewise. * m4/strndup.m4 (gl_FUNC_STRNDUP): Likewise. * m4/strnlen.m4 (gl_FUNC_STRNLEN): Likewise. * m4/strsep.m4 (gl_FUNC_STRSEP): Likewise. * m4/strverscmp.m4 (gl_FUNC_STRVERSCMP): Likewise. * m4/vasprintf.m4 (gl_PREREQ_VASPRINTF_H): Likewise. * m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise. * m4/lock.m4 (gl_LOCK_EARLY_BODY): Likewise, but provide fallback, so that lock.m4 can be used in gettext without extensions module.
author Eric Blake <ebb9@byu.net>
date Wed, 12 Sep 2007 15:59:57 +0000
parents d41d48e822b4
children f6cba5a556ce
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1 # poll.m4 serial 7
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2 dnl Copyright (c) 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_POLL],
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8 [
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9 AC_CHECK_HEADERS(poll.h)
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10 if test "$ac_cv_header_poll_h" = no; then
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11 gl_cv_func_poll=no
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12 else
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13 AC_CHECK_FUNC(poll,
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14 [# Check whether poll() works on special files (like /dev/null) and
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15 # and ttys (like /dev/tty). On MacOS X 10.4.0 and AIX 5.3, it doesn't.
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16 AC_TRY_RUN([
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17 #include <fcntl.h>
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18 #include <poll.h>
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19 int main()
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20 {
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21 struct pollfd ufd;
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22 /* Try /dev/null for reading. */
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23 ufd.fd = open ("/dev/null", O_RDONLY);
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24 if (ufd.fd < 0)
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25 /* If /dev/null does not exist, it's not MacOS X nor AIX. */
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26 return 0;
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27 ufd.events = POLLIN;
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28 ufd.revents = 0;
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29 if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN))
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30 return 1;
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31 /* Try /dev/null for writing. */
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32 ufd.fd = open ("/dev/null", O_WRONLY);
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33 if (ufd.fd < 0)
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34 /* If /dev/null does not exist, it's not MacOS X nor AIX. */
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35 return 0;
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36 ufd.events = POLLOUT;
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37 ufd.revents = 0;
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38 if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT))
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39 return 1;
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40 /* Trying /dev/tty may be too environment dependent. */
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41 return 0;
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42 }],
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43 [gl_cv_func_poll=yes],
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44 [gl_cv_func_poll=no],
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45 [# When cross-compiling, assume that poll() works everywhere except on
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46 # MacOS X or AIX, regardless of its version.
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47 AC_EGREP_CPP([MacOSX], [
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48 #if (defined(__APPLE__) && defined(__MACH__)) || defined(_AIX)
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49 This is MacOSX or AIX
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50 #endif
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51 ], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])])
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52 fi
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53 if test $gl_cv_func_poll = yes; then
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54 AC_DEFINE([HAVE_POLL], 1,
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55 [Define to 1 if you have the 'poll' function and it works.])
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56 POLL_H=
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57 else
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58 AC_LIBOBJ(poll)
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59 AC_DEFINE(poll, rpl_poll,
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60 [Define to poll if the replacement function should be used.])
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61 gl_PREREQ_POLL
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62 POLL_H=poll.h
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63 fi
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64 AC_SUBST([POLL_H])
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65 ])
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66
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67 # Prerequisites of lib/poll.c.
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68 AC_DEFUN([gl_PREREQ_POLL],
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69 [
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70 AC_CHECK_HEADERS_ONCE(sys/ioctl.h sys/filio.h)
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71 ])