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fcntl: port portions of fcntl to mingw Borrow ideas from dup_cloexec and dup3 to implement F_DUPFD and F_DUPFD_CLOEXEC. Support querying the inheritance status via F_GETFD, but for now, no support for changing with F_SETFD. The remaining portions of fcntl fail with EINVAL. * m4/fcntl.m4 (gl_FUNC_FCNTL): Also build fcntl.c on mingw. * lib/fcntl.c (fcntl) <F_DUPFD, F_DUPFD_CLOEXEC, F_GETFD>: Provide replacement for mingw. * modules/fcntl (Description): Update. (Depends-on): Add dup2. * m4/fcntl_h.m4 (gl_FCNTL_H_DEFAULTS): Add witness. * modules/fcntl-h (Makefile.am): Substitute it. * lib/fcntl.in.h (fcntl): Update declaration. (F_DUPFD, F_GETFD): New macros, when needed. * doc/posix-headers/fcntl.texi (fcntl.h): Update documentation. * doc/posix-functions/fcntl.texi (fcntl): Likewise. * tests/test-fcntl.c (check_flags, main): Enhance test for items we now guarantee. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Wed, 16 Dec 2009 09:11:32 -0700
parents dbc90a3fc4ed
children c2cbabec01dd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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f3aceada3c52 fcntl: port portions of fcntl to mingw
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1 # fcntl.m4 serial 3
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2 dnl Copyright (C) 2009 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 AC_CACHE_CHECK([whether fcntl handles F_DUPFD correctly],
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28 [gl_cv_func_fcntl_f_dupfd_works],
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29 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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30 #include <fcntl.h>
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31 ]], [[return fcntl (0, F_DUPFD, -1) != -1;
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32 ]])],
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33 [gl_cv_func_fcntl_f_dupfd_works=yes],
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34 [gl_cv_func_fcntl_f_dupfd_works=no],
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35 [# Guess that it works on glibc systems
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36 case $host_os in #((
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37 *-gnu*) gl_cv_func_fcntl_f_dupfd_works="guessing yes";;
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38 *) gl_cv_func_fcntl_f_dupfd_works="guessing no";;
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39 esac])])
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40 case $gl_cv_func_fcntl_f_dupfd_works in
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41 *yes) ;;
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42 *) gl_REPLACE_FCNTL
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43 AC_DEFINE([FCNTL_DUPFD_BUGGY], [1], [Define this to 1 if F_DUPFD
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44 behavior does not match POSIX]) ;;
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45 esac
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46
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47 dnl Many systems lack F_DUPFD_CLOEXEC
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48 AC_CACHE_CHECK([whether fcntl understands F_DUPFD_CLOEXEC],
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49 [gl_cv_func_fcntl_f_dupfd_cloexec],
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50 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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51 #include <fcntl.h>
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52 #ifndef F_DUPFD_CLOEXEC
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53 choke me
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54 #endif
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55 ]])],
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56 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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57 #ifdef __linux__
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58 /* The Linux kernel only added F_DUPFD_CLOEXEC in 2.6.24, so we always replace
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59 it to support the semantics on older kernels that failed with EINVAL. */
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60 choke me
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61 #endif
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62 ]])],
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63 [gl_cv_func_fcntl_f_dupfd_cloexec=yes],
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64 [gl_cv_func_fcntl_f_dupfd_cloexec="needs runtime check"])],
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65 [gl_cv_func_fcntl_f_dupfd_cloexec=no])])
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66 if test "$gl_cv_func_fcntl_f_dupfd_cloexec" != yes; then
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67 gl_REPLACE_FCNTL
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68 dnl No witness macro needed for this bug.
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69 fi
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70 fi
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71 ])
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72
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73 AC_DEFUN([gl_REPLACE_FCNTL],
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74 [
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75 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
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76 AC_CHECK_FUNCS_ONCE([fcntl])
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77 if test $ac_cv_func_fcntl = no; then
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78 HAVE_FCNTL=0
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79 else
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80 REPLACE_FCNTL=1
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81 fi
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82 AC_LIBOBJ([fcntl])
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83 ])