| 1 | # serial 14
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| 2 | # See if we need to provide fdopendir.
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| 3 |
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| 4 | dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
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| 5 | dnl This file is free software; the Free Software Foundation
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| 6 | dnl gives unlimited permission to copy and/or distribute it,
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| 7 | dnl with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | # Written by Eric Blake.
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| 10 |
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| 11 | AC_DEFUN([gl_FUNC_FDOPENDIR],
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| 12 | [
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| 13 | AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
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| 14 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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| 15 |
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| 16 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 17 |
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| 18 | dnl FreeBSD 7.3 has the function, but failed to declare it.
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| 19 | AC_CHECK_DECLS([fdopendir], [], [HAVE_DECL_FDOPENDIR=0], [[
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| 20 | #include <dirent.h>
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| 21 | ]])
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| 22 | AC_CHECK_FUNCS_ONCE([fdopendir])
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| 23 | if test $ac_cv_func_fdopendir = no; then
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| 24 | HAVE_FDOPENDIR=0
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| 25 | else
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| 26 | AC_CACHE_CHECK([whether fdopendir works],
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| 27 | [gl_cv_func_fdopendir_works],
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| 28 | [AC_RUN_IFELSE(
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| 29 | [AC_LANG_PROGRAM([[
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| 30 | #include <dirent.h>
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| 31 | #include <fcntl.h>
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| 32 | #include <unistd.h>
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| 33 | ]GL_MDA_DEFINES[
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| 34 | #if !HAVE_DECL_FDOPENDIR
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| 35 | extern
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| 36 | # ifdef __cplusplus
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| 37 | "C"
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| 38 | # endif
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| 39 | DIR *fdopendir (int);
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| 40 | #endif
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| 41 | ]],
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| 42 | [[int result = 0;
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| 43 | int fd = open ("conftest.c", O_RDONLY);
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| 44 | if (fd < 0) result |= 1;
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| 45 | if (fdopendir (fd)) result |= 2;
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| 46 | if (close (fd)) result |= 4;
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| 47 | return result;
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| 48 | ]])],
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| 49 | [gl_cv_func_fdopendir_works=yes],
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| 50 | [gl_cv_func_fdopendir_works=no],
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| 51 | [case "$host_os" in
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| 52 | # Guess yes on glibc systems.
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| 53 | *-gnu*) gl_cv_func_fdopendir_works="guessing yes" ;;
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| 54 | # Guess yes on musl systems.
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| 55 | *-musl*) gl_cv_func_fdopendir_works="guessing yes" ;;
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| 56 | # If we don't know, obey --enable-cross-guesses.
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| 57 | *) gl_cv_func_fdopendir_works="$gl_cross_guess_normal" ;;
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| 58 | esac
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| 59 | ])])
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| 60 | case "$gl_cv_func_fdopendir_works" in
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| 61 | *yes) ;;
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| 62 | *)
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| 63 | REPLACE_FDOPENDIR=1
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| 64 | ;;
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| 65 | esac
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| 66 | fi
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| 67 | ])
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