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annotate m4/fcntl.m4 @ 17930:71aba7a74c52

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Android doesn't define RLIM_SAVED_* Portability problem reported by Kevin Cernekee in: http://lists.gnu.org/archive/html/bug-gnulib/2015-02/msg00122.html * doc/posix-headers/sys_resource.texi (sys/resource.h): Mention the portability problem. * lib/getdtablesize.c (RLIM_SAVED_CUR, RLIM_SAVED_MAX): Define if not defined. * m4/dup2.m4 (gl_FUNC_DUP2): * m4/fcntl.m4 (gl_FUNC_FCNTL): Likewise.
author Paul Eggert <eggert@cs.ucla.edu>
date Sun, 22 Feb 2015 19:07:46 -0800
parents 2b5c3699ac6f
children
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17930
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1 # fcntl.m4 serial 8
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2 dnl Copyright (C) 2009-2015 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(
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31 [AC_LANG_PROGRAM(
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32 [[#include <errno.h>
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33 #include <fcntl.h>
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34 #include <limits.h>
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35 #include <sys/resource.h>
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36 #include <unistd.h>
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37 #ifndef RLIM_SAVED_CUR
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38 # define RLIM_SAVED_CUR RLIM_INFINITY
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39 #endif
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40 #ifndef RLIM_SAVED_MAX
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41 # define RLIM_SAVED_MAX RLIM_INFINITY
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42 #endif
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43 ]],
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44 [[int result = 0;
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45 int bad_fd = INT_MAX;
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46 struct rlimit rlim;
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47 if (getrlimit (RLIMIT_NOFILE, &rlim) == 0
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48 && 0 <= rlim.rlim_cur && rlim.rlim_cur <= INT_MAX
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49 && rlim.rlim_cur != RLIM_INFINITY
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50 && rlim.rlim_cur != RLIM_SAVED_MAX
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51 && rlim.rlim_cur != RLIM_SAVED_CUR)
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52 bad_fd = rlim.rlim_cur;
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53 if (fcntl (0, F_DUPFD, -1) != -1) result |= 1;
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54 if (errno != EINVAL) result |= 2;
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55 if (fcntl (0, F_DUPFD, bad_fd) != -1) result |= 4;
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56 if (errno != EINVAL) result |= 8;
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57 return result;]])],
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58 [gl_cv_func_fcntl_f_dupfd_works=yes],
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59 [gl_cv_func_fcntl_f_dupfd_works=no],
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60 [case $host_os in
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61 aix* | cygwin* | haiku*)
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62 gl_cv_func_fcntl_f_dupfd_works="guessing no" ;;
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63 *) gl_cv_func_fcntl_f_dupfd_works="guessing yes" ;;
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64 esac])])
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65 case $gl_cv_func_fcntl_f_dupfd_works in
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66 *yes) ;;
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67 *) gl_REPLACE_FCNTL
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68 AC_DEFINE([FCNTL_DUPFD_BUGGY], [1], [Define this to 1 if F_DUPFD
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69 behavior does not match POSIX]) ;;
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70 esac
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71
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72 dnl Many systems lack F_DUPFD_CLOEXEC
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73 AC_CACHE_CHECK([whether fcntl understands F_DUPFD_CLOEXEC],
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74 [gl_cv_func_fcntl_f_dupfd_cloexec],
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75 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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76 #include <fcntl.h>
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77 #ifndef F_DUPFD_CLOEXEC
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78 choke me
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79 #endif
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80 ]])],
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81 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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82 #ifdef __linux__
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83 /* The Linux kernel only added F_DUPFD_CLOEXEC in 2.6.24, so we always replace
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84 it to support the semantics on older kernels that failed with EINVAL. */
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85 choke me
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86 #endif
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87 ]])],
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88 [gl_cv_func_fcntl_f_dupfd_cloexec=yes],
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89 [gl_cv_func_fcntl_f_dupfd_cloexec="needs runtime check"])],
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90 [gl_cv_func_fcntl_f_dupfd_cloexec=no])])
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91 if test "$gl_cv_func_fcntl_f_dupfd_cloexec" != yes; then
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92 gl_REPLACE_FCNTL
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93 dnl No witness macro needed for this bug.
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94 fi
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95 fi
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96 dnl Replace fcntl() for supporting the gnulib-defined fchdir() function,
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97 dnl to keep fchdir's bookkeeping up-to-date.
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98 m4_ifdef([gl_FUNC_FCHDIR], [
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99 gl_TEST_FCHDIR
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100 if test $HAVE_FCHDIR = 0; then
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101 gl_REPLACE_FCNTL
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102 fi
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103 ])
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104 ])
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105
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106 AC_DEFUN([gl_REPLACE_FCNTL],
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107 [
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108 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
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109 AC_CHECK_FUNCS_ONCE([fcntl])
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110 if test $ac_cv_func_fcntl = no; then
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111 HAVE_FCNTL=0
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112 else
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113 REPLACE_FCNTL=1
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114 fi
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115 ])