HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 428f9e95 JE |
1 | # poll.m4 serial 17 |
| 2 | dnl Copyright (c) 2003, 2005-2007, 2009-2013 Free Software Foundation, Inc. | |
| 3 | dnl This file is free software; the Free Software Foundation | |
| 4 | dnl gives unlimited permission to copy and/or distribute it, | |
| 5 | dnl with or without modifications, as long as this notice is preserved. | |
| 6 | ||
| 7 | AC_DEFUN([gl_FUNC_POLL], | |
| 8 | [ | |
| 9 | AC_REQUIRE([gl_POLL_H]) | |
| 10 | AC_REQUIRE([gl_SOCKETS]) | |
| 11 | if test $ac_cv_header_poll_h = no; then | |
| 12 | ac_cv_func_poll=no | |
| 13 | gl_cv_func_poll=no | |
| 14 | else | |
| 15 | AC_CHECK_FUNC([poll], | |
| 16 | [# Check whether poll() works on special files (like /dev/null) and | |
| 17 | # and ttys (like /dev/tty). On Mac OS X 10.4.0 and AIX 5.3, it doesn't. | |
| 18 | AC_RUN_IFELSE([AC_LANG_SOURCE([[ | |
| 19 | #include <fcntl.h> | |
| 20 | #include <poll.h> | |
| 21 | int main() | |
| 22 | { | |
| 23 | int result = 0; | |
| 24 | struct pollfd ufd; | |
| 25 | /* Try /dev/null for reading. */ | |
| 26 | ufd.fd = open ("/dev/null", O_RDONLY); | |
| 27 | /* If /dev/null does not exist, it's not Mac OS X nor AIX. */ | |
| 28 | if (ufd.fd >= 0) | |
| 29 | { | |
| 30 | ufd.events = POLLIN; | |
| 31 | ufd.revents = 0; | |
| 32 | if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN)) | |
| 33 | result |= 1; | |
| 34 | } | |
| 35 | /* Try /dev/null for writing. */ | |
| 36 | ufd.fd = open ("/dev/null", O_WRONLY); | |
| 37 | /* If /dev/null does not exist, it's not Mac OS X nor AIX. */ | |
| 38 | if (ufd.fd >= 0) | |
| 39 | { | |
| 40 | ufd.events = POLLOUT; | |
| 41 | ufd.revents = 0; | |
| 42 | if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT)) | |
| 43 | result |= 2; | |
| 44 | } | |
| 45 | /* Trying /dev/tty may be too environment dependent. */ | |
| 46 | return result; | |
| 47 | }]])], | |
| 48 | [gl_cv_func_poll=yes], | |
| 49 | [gl_cv_func_poll=no], | |
| 50 | [# When cross-compiling, assume that poll() works everywhere except on | |
| 51 | # Mac OS X or AIX, regardless of its version. | |
| 52 | AC_EGREP_CPP([MacOSX], [ | |
| 53 | #if (defined(__APPLE__) && defined(__MACH__)) || defined(_AIX) | |
| 54 | This is MacOSX or AIX | |
| 55 | #endif | |
| 56 | ], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])]) | |
| 57 | fi | |
| 58 | if test $gl_cv_func_poll != yes; then | |
| 59 | AC_CHECK_FUNC([poll], [ac_cv_func_poll=yes], [ac_cv_func_poll=no]) | |
| 60 | if test $ac_cv_func_poll = no; then | |
| 61 | HAVE_POLL=0 | |
| 62 | else | |
| 63 | REPLACE_POLL=1 | |
| 64 | fi | |
| 65 | fi | |
| 66 | if test $HAVE_POLL = 0 || test $REPLACE_POLL = 1; then | |
| 67 | : | |
| 68 | else | |
| 69 | AC_DEFINE([HAVE_POLL], [1], | |
| 70 | [Define to 1 if you have the 'poll' function and it works.]) | |
| 71 | fi | |
| 72 | ||
| 73 | dnl Determine the needed libraries. | |
| 74 | LIB_POLL="$LIBSOCKET" | |
| 75 | if test $HAVE_POLL = 0 || test $REPLACE_POLL = 1; then | |
| 76 | case "$host_os" in | |
| 77 | mingw*) | |
| 78 | dnl On the MSVC platform, the function MsgWaitForMultipleObjects | |
| 79 | dnl (used in lib/poll.c) requires linking with -luser32. On mingw, | |
| 80 | dnl it is implicit. | |
| 81 | AC_LINK_IFELSE( | |
| 82 | [AC_LANG_SOURCE([[ | |
| 83 | #define WIN32_LEAN_AND_MEAN | |
| 84 | #include <windows.h> | |
| 85 | int | |
| 86 | main () | |
| 87 | { | |
| 88 | MsgWaitForMultipleObjects (0, NULL, 0, 0, 0); | |
| 89 | return 0; | |
| 90 | }]])], | |
| 91 | [], | |
| 92 | [LIB_POLL="$LIB_POLL -luser32"]) | |
| 93 | ;; | |
| 94 | esac | |
| 95 | fi | |
| 96 | AC_SUBST([LIB_POLL]) | |
| 97 | ]) | |
| 98 | ||
| 99 | # Prerequisites of lib/poll.c. | |
| 100 | AC_DEFUN([gl_PREREQ_POLL], | |
| 101 | [ | |
| 102 | AC_CHECK_HEADERS_ONCE([sys/ioctl.h sys/filio.h]) | |
| 103 | ]) |