Mercurial > hg > octave-lojdl > gnulib-hg
changeset 5989:c0415917431f
Don't use poll() on MacOS X 10.4.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 15 Jul 2005 10:34:31 +0000 |
parents | 60262f4b3d5f |
children | 56dddeef06ca |
files | m4/ChangeLog m4/poll.m4 |
diffstat | 2 files changed, 53 insertions(+), 4 deletions(-) [+] |
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--- a/m4/ChangeLog +++ b/m4/ChangeLog @@ -1,3 +1,8 @@ +2005-06-01 Bruno Haible <bruno@clisp.org> + + * poll.m4 (gl_FUNC_POLL): Check against MacOS X 10.4 poll() bug. + When using lib/poll.c, define poll as rpl_poll. + 2005-07-14 Bruno Haible <bruno@clisp.org> * argp.m4 (gl_ARGP): Remove invocation of gl_FUNC_GLIBC_UNLOCKED_IO.
--- a/m4/poll.m4 +++ b/m4/poll.m4 @@ -1,5 +1,5 @@ -# poll.m4 serial 3 -dnl Copyright (c) 2003 Free Software Foundation, Inc. +# poll.m4 serial 4 +dnl Copyright (c) 2003, 2005 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -14,8 +14,52 @@ fi AC_SUBST([POLL_H]) - AC_REPLACE_FUNCS(poll) - if test $ac_cv_func_poll = no; then + AC_CHECK_FUNC(poll, + [# Check whether poll() works on special files (like /dev/null) and + # and ttys (like /dev/tty). On MacOS X 10.4.0, it doesn't. + AC_TRY_RUN([ +#include <fcntl.h> +#include <poll.h> + int main() + { + struct pollfd ufd; + /* Try /dev/null for reading. */ + ufd.fd = open ("/dev/null", O_RDONLY); + if (ufd.fd < 0) /* If /dev/null does not exist, it's not MacOS X. */ + return 0; + ufd.events = POLLIN; + ufd.revents = 0; + if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLIN)) + return 1; + /* Try /dev/null for writing. */ + ufd.fd = open ("/dev/null", O_WRONLY); + if (ufd.fd < 0) /* If /dev/null does not exist, it's not MacOS X. */ + return 0; + ufd.events = POLLOUT; + ufd.revents = 0; + if (!(poll (&ufd, 1, 0) == 1 && ufd.revents == POLLOUT)) + return 1; + /* Trying /dev/tty may be too environment dependent. */ + return 0; + }], + [gl_cv_func_poll=yes], + [gl_cv_func_poll=no], + [# When cross-compiling, assume that poll() works everywhere except on + # MacOS X, regardless of its version. + AC_EGREP_CPP([MacOSX], [ +#if defined(__APPLE__) && defined(__MACH__) +This is MacOSX +#endif +], [gl_cv_func_poll=no], [gl_cv_func_poll=yes])])]) + if test $gl_cv_func_poll = yes; then + AC_DEFINE([HAVE_POLL], 1, + [Define to 1 if you have the 'poll' function and it works.]) + fi + + if test $gl_cv_func_poll = no; then + AC_LIBOBJ(poll) + AC_DEFINE(poll, rpl_poll, + [Define to poll if the replacement function should be used.]) gl_PREREQ_POLL fi ])