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96 lines
2.7 KiB
Plaintext
96 lines
2.7 KiB
Plaintext
# open.m4 serial 15
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dnl Copyright (C) 2007-2019 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_OPEN],
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[
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_REQUIRE([gl_PREPROC_O_CLOEXEC])
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case "$host_os" in
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mingw* | pw*)
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REPLACE_OPEN=1
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;;
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*)
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dnl open("foo/") should not create a file when the file name has a
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dnl trailing slash. FreeBSD only has the problem on symlinks.
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AC_CHECK_FUNCS_ONCE([lstat])
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if test "$gl_cv_macro_O_CLOEXEC" != yes; then
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REPLACE_OPEN=1
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fi
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AC_CACHE_CHECK([whether open recognizes a trailing slash],
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[gl_cv_func_open_slash],
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[# Assume that if we have lstat, we can also check symlinks.
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if test $ac_cv_func_lstat = yes; then
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touch conftest.tmp
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ln -s conftest.tmp conftest.lnk
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fi
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#include <fcntl.h>
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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int main ()
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{
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int result = 0;
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#if HAVE_LSTAT
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if (open ("conftest.lnk/", O_RDONLY) != -1)
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result |= 1;
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#endif
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if (open ("conftest.sl/", O_CREAT, 0600) >= 0)
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result |= 2;
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return result;
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}]])],
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[gl_cv_func_open_slash=yes],
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[gl_cv_func_open_slash=no],
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[
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changequote(,)dnl
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case "$host_os" in
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freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)
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gl_cv_func_open_slash="guessing no" ;;
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*)
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gl_cv_func_open_slash="guessing yes" ;;
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esac
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changequote([,])dnl
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])
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rm -f conftest.sl conftest.tmp conftest.lnk
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])
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case "$gl_cv_func_open_slash" in
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*no)
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AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
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[Define to 1 if open() fails to recognize a trailing slash.])
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REPLACE_OPEN=1
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;;
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esac
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;;
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esac
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dnl Replace open() for supporting the gnulib-defined fchdir() function,
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dnl to keep fchdir's bookkeeping up-to-date.
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m4_ifdef([gl_FUNC_FCHDIR], [
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if test $REPLACE_OPEN = 0; then
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gl_TEST_FCHDIR
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if test $HAVE_FCHDIR = 0; then
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REPLACE_OPEN=1
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fi
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fi
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])
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dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
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m4_ifdef([gl_NONBLOCKING_IO], [
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if test $REPLACE_OPEN = 0; then
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gl_NONBLOCKING_IO
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if test $gl_cv_have_open_O_NONBLOCK != yes; then
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REPLACE_OPEN=1
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fi
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fi
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])
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])
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# Prerequisites of lib/open.c.
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AC_DEFUN([gl_PREREQ_OPEN],
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[
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AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
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:
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])
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