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annotate m4/fcntl.m4 @ 17602:f98ee53d8e71

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tests: simplify porting to Solaris 10 /bin/sh Some test cases in 'grep' need a shell that groks '$('; export re_shell_ for their benefit. Problem reported for 'grep' by Dagobert Michelsen in <http://bugs.gnu.org/16380>. * tests/init.sh (re_shell_): Export if it's used.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 07 Jan 2014 11:46:27 -0800
parents 344018b6e5d7
children 0d3cc0db9cb7
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1 # fcntl.m4 serial 5
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2 dnl Copyright (C) 2009-2014 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 # For now, this module ensures that fcntl()
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8 # - supports F_DUPFD correctly
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9 # - supports or emulates F_DUPFD_CLOEXEC
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10 # - supports F_GETFD
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11 # Still to be ported to mingw:
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12 # - F_SETFD
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13 # - F_GETFL, F_SETFL
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14 # - F_GETOWN, F_SETOWN
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15 # - F_GETLK, F_SETLK, F_SETLKW
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16 AC_DEFUN([gl_FUNC_FCNTL],
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17 [
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18 dnl Persuade glibc to expose F_DUPFD_CLOEXEC.
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19 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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20 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
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21 AC_REQUIRE([AC_CANONICAL_HOST])
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22 AC_CHECK_FUNCS_ONCE([fcntl])
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23 if test $ac_cv_func_fcntl = no; then
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24 gl_REPLACE_FCNTL
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25 else
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26 dnl cygwin 1.5.x F_DUPFD has wrong errno, and allows negative target
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27 dnl haiku alpha 2 F_DUPFD has wrong errno
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28 AC_CACHE_CHECK([whether fcntl handles F_DUPFD correctly],
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29 [gl_cv_func_fcntl_f_dupfd_works],
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30 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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31 #include <fcntl.h>
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32 #include <errno.h>
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33 ]], [[int result = 0;
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34 if (fcntl (0, F_DUPFD, -1) != -1) result |= 1;
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35 if (errno != EINVAL) result |= 2;
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36 return result;
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37 ]])],
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38 [gl_cv_func_fcntl_f_dupfd_works=yes],
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39 [gl_cv_func_fcntl_f_dupfd_works=no],
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40 [# Guess that it works on glibc systems
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41 case $host_os in #((
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42 *-gnu*) gl_cv_func_fcntl_f_dupfd_works="guessing yes";;
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43 *) gl_cv_func_fcntl_f_dupfd_works="guessing no";;
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44 esac])])
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45 case $gl_cv_func_fcntl_f_dupfd_works in
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46 *yes) ;;
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47 *) gl_REPLACE_FCNTL
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48 AC_DEFINE([FCNTL_DUPFD_BUGGY], [1], [Define this to 1 if F_DUPFD
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49 behavior does not match POSIX]) ;;
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50 esac
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51
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52 dnl Many systems lack F_DUPFD_CLOEXEC
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53 AC_CACHE_CHECK([whether fcntl understands F_DUPFD_CLOEXEC],
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54 [gl_cv_func_fcntl_f_dupfd_cloexec],
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55 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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56 #include <fcntl.h>
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57 #ifndef F_DUPFD_CLOEXEC
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58 choke me
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59 #endif
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60 ]])],
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61 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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62 #ifdef __linux__
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63 /* The Linux kernel only added F_DUPFD_CLOEXEC in 2.6.24, so we always replace
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64 it to support the semantics on older kernels that failed with EINVAL. */
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65 choke me
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66 #endif
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67 ]])],
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68 [gl_cv_func_fcntl_f_dupfd_cloexec=yes],
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69 [gl_cv_func_fcntl_f_dupfd_cloexec="needs runtime check"])],
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70 [gl_cv_func_fcntl_f_dupfd_cloexec=no])])
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71 if test "$gl_cv_func_fcntl_f_dupfd_cloexec" != yes; then
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72 gl_REPLACE_FCNTL
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73 dnl No witness macro needed for this bug.
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74 fi
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75 fi
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76 dnl Replace fcntl() for supporting the gnulib-defined fchdir() function,
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77 dnl to keep fchdir's bookkeeping up-to-date.
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78 m4_ifdef([gl_FUNC_FCHDIR], [
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79 gl_TEST_FCHDIR
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80 if test $HAVE_FCHDIR = 0; then
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81 gl_REPLACE_FCNTL
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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 AC_DEFUN([gl_REPLACE_FCNTL],
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87 [
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88 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
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89 AC_CHECK_FUNCS_ONCE([fcntl])
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90 if test $ac_cv_func_fcntl = no; then
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91 HAVE_FCNTL=0
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92 else
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93 REPLACE_FCNTL=1
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94 fi
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95 ])