| 1 | # Configure fcntl.h.
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| 2 | dnl Copyright (C) 2006 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 | dnl Written by Paul Eggert.
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| 8 |
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| 9 | AC_DEFUN([gl_FCNTL_H],
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| 10 | [
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| 11 | AC_CACHE_CHECK([for working fcntl.h], gl_cv_header_working_fcntl_h,
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| 12 | [AC_RUN_IFELSE(
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| 13 | [AC_LANG_PROGRAM(
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| 14 | [[#include <sys/types.h>
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| 15 | #include <sys/stat.h>
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| 16 | #include <unistd.h>
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| 17 | #include <fcntl.h>
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| 18 | #ifndef O_NOFOLLOW
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| 19 | #define O_NOFOLLOW 0
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| 20 | #endif
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| 21 | static int const constants[] =
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| 22 | {
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| 23 | O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
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| 24 | O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
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| 25 | };
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| 26 | ]],
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| 27 | [[static char const sym[] = "conftest.sym";
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| 28 | if (O_NOFOLLOW)
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| 29 | {
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| 30 | if (symlink (".", sym) != 0)
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| 31 | return 1;
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| 32 | if (0 <= open (sym, O_RDONLY | O_NOFOLLOW))
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| 33 | return 1;
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| 34 | }
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| 35 | return !constants;]])],
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| 36 | [gl_cv_header_working_fcntl_h=yes],
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| 37 | [gl_cv_header_working_fcntl_h=no],
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| 38 | [gl_cv_header_working_fcntl_h=cross-compiling])])
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| 39 |
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| 40 | if test $gl_cv_header_working_fcntl_h != yes; then
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| 41 | AC_DEFINE([O_NOFOLLOW_IS_INEFFECTIVE], 1,
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| 42 | [Define to 1 if O_NOFOLLOW is ineffective.])
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| 43 | fi
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| 44 |
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| 45 | gl_ABSOLUTE_HEADER([fcntl.h])
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| 46 | ABSOLUTE_FCNTL_H=\"$gl_cv_absolute_fcntl_h\"
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| 47 | AC_SUBST([ABSOLUTE_FCNTL_H])
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| 48 | FCNTL_H='fcntl.h'
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| 49 | AC_SUBST([FCNTL_H])
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| 50 | ])
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