| 1 | # open.m4 serial 13
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| 2 | dnl Copyright (C) 2007-2012 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_OPEN],
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| 8 | [
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| 9 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 10 | case "$host_os" in
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| 11 | mingw* | pw*)
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| 12 | REPLACE_OPEN=1
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| 13 | ;;
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| 14 | *)
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| 15 | dnl open("foo/") should not create a file when the file name has a
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| 16 | dnl trailing slash. FreeBSD only has the problem on symlinks.
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| 17 | AC_CHECK_FUNCS_ONCE([lstat])
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| 18 | AC_CACHE_CHECK([whether open recognizes a trailing slash],
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| 19 | [gl_cv_func_open_slash],
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| 20 | [# Assume that if we have lstat, we can also check symlinks.
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| 21 | if test $ac_cv_func_lstat = yes; then
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| 22 | touch conftest.tmp
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| 23 | ln -s conftest.tmp conftest.lnk
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| 24 | fi
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| 25 | AC_RUN_IFELSE(
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| 26 | [AC_LANG_SOURCE([[
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| 27 | #include <fcntl.h>
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| 28 | #if HAVE_UNISTD_H
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| 29 | # include <unistd.h>
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| 30 | #endif
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| 31 | int main ()
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| 32 | {
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| 33 | int result = 0;
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| 34 | #if HAVE_LSTAT
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| 35 | if (open ("conftest.lnk/", O_RDONLY) != -1)
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| 36 | result |= 1;
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| 37 | #endif
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| 38 | if (open ("conftest.sl/", O_CREAT, 0600) >= 0)
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| 39 | result |= 2;
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| 40 | return result;
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| 41 | }]])],
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| 42 | [gl_cv_func_open_slash=yes],
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| 43 | [gl_cv_func_open_slash=no],
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| 44 | [
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| 45 | changequote(,)dnl
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| 46 | case "$host_os" in
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| 47 | freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)
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| 48 | gl_cv_func_open_slash="guessing no" ;;
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| 49 | *)
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| 50 | gl_cv_func_open_slash="guessing yes" ;;
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| 51 | esac
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| 52 | changequote([,])dnl
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| 53 | ])
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| 54 | rm -f conftest.sl conftest.tmp conftest.lnk
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| 55 | ])
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| 56 | case "$gl_cv_func_open_slash" in
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| 57 | *no)
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| 58 | AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
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| 59 | [Define to 1 if open() fails to recognize a trailing slash.])
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| 60 | REPLACE_OPEN=1
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| 61 | ;;
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| 62 | esac
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| 63 | ;;
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| 64 | esac
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| 65 | dnl Replace open() for supporting the gnulib-defined fchdir() function,
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| 66 | dnl to keep fchdir's bookkeeping up-to-date.
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| 67 | m4_ifdef([gl_FUNC_FCHDIR], [
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| 68 | if test $REPLACE_OPEN = 0; then
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| 69 | gl_TEST_FCHDIR
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| 70 | if test $HAVE_FCHDIR = 0; then
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| 71 | REPLACE_OPEN=1
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| 72 | fi
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| 73 | fi
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| 74 | ])
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| 75 | dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
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| 76 | m4_ifdef([gl_NONBLOCKING_IO], [
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| 77 | if test $REPLACE_OPEN = 0; then
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| 78 | gl_NONBLOCKING_IO
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| 79 | if test $gl_cv_have_open_O_NONBLOCK != yes; then
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| 80 | REPLACE_OPEN=1
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| 81 | fi
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| 82 | fi
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| 83 | ])
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| 84 | ])
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| 85 |
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| 86 | # Prerequisites of lib/open.c.
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| 87 | AC_DEFUN([gl_PREREQ_OPEN],
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| 88 | [
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| 89 | AC_REQUIRE([AC_C_INLINE])
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| 90 | AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
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| 91 | :
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| 92 | ])
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