Mercurial > hg > octave-lojdl > gnulib-hg
annotate m4/poll.m4 @ 6679:41b90d084576
(gl_FUNC_POLL): If we deem poll(2) unacceptable, use
our replacement poll.h in any case, to avoid a differing
declaration from a system header. Seen on AIX.
author | Paul Eggert <eggert@cs.ucla.edu> |
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date | Sat, 04 Mar 2006 06:34:54 +0000 |
parents | c0415917431f |
children | 427cd89c6d7b |
rev | line source |
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6679
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1 # poll.m4 serial 5 |
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2 dnl Copyright (c) 2003, 2005, 2006 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 POLL_H=poll.h |
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12 else |
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13 POLL_H= |
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14 fi |
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15 AC_SUBST([POLL_H]) |
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16 |
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17 AC_CHECK_FUNC(poll, |
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18 [# Check whether poll() works on special files (like /dev/null) and |
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19 # and ttys (like /dev/tty). On MacOS X 10.4.0, it doesn't. |
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20 AC_TRY_RUN([ |
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21 #include <fcntl.h> |
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22 #include <poll.h> |
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23 int main() |
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24 { |
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25 struct pollfd ufd; |
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26 /* Try /dev/null for reading. */ |
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27 ufd.fd = open ("/dev/null", O_RDONLY); |
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28 if (ufd.fd < 0) /* If /dev/null does not exist, it's not MacOS X. */ |
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29 return 0; |
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30 ufd.events = POLLIN; |
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31 ufd.revents = 0; |
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32 if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN)) |
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33 return 1; |
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34 /* Try /dev/null for writing. */ |
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35 ufd.fd = open ("/dev/null", O_WRONLY); |
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36 if (ufd.fd < 0) /* If /dev/null does not exist, it's not MacOS X. */ |
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37 return 0; |
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38 ufd.events = POLLOUT; |
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39 ufd.revents = 0; |
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40 if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT)) |
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41 return 1; |
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42 /* Trying /dev/tty may be too environment dependent. */ |
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43 return 0; |
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44 }], |
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45 [gl_cv_func_poll=yes], |
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46 [gl_cv_func_poll=no], |
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47 [# When cross-compiling, assume that poll() works everywhere except on |
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48 # MacOS X, regardless of its version. |
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49 AC_EGREP_CPP([MacOSX], [ |
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50 #if defined(__APPLE__) && defined(__MACH__) |
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51 This is MacOSX |
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52 #endif |
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53 ], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])]) |
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54 if test $gl_cv_func_poll = yes; then |
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55 AC_DEFINE([HAVE_POLL], 1, |
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56 [Define to 1 if you have the 'poll' function and it works.]) |
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57 fi |
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58 |
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59 if test $gl_cv_func_poll = no; then |
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60 POLL_H=poll.h # Avoid differing declaration from a system header. |
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61 AC_LIBOBJ(poll) |
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62 AC_DEFINE(poll, rpl_poll, |
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63 [Define to poll if the replacement function should be used.]) |
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64 gl_PREREQ_POLL |
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65 fi |
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66 ]) |
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67 |
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68 # Prerequisites of lib/poll.c. |
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69 AC_DEFUN([gl_PREREQ_POLL], |
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70 [ |
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71 AC_REQUIRE([AC_HEADER_TIME]) |
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72 AC_CHECK_HEADERS_ONCE(sys/time.h) |
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73 ]) |