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annotate m4/dup2.m4 @ 17729:874a5cc03904

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test-userspec: don't look up numeric user names * tests/test-userspec.c: I found a system for which getpwnam("0") returned a pointer to a non-root user's entry, and that made the test fail. (T): Prefix each numeric input with "+", to inhibit lookup.
author Jim Meyering <meyering@fb.com>
date Fri, 18 Jul 2014 14:16:44 -0700
parents 0d3cc0db9cb7
children ab58d4870664
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #serial 20
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2 dnl Copyright (C) 2002, 2005, 2007, 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 AC_DEFUN([gl_FUNC_DUP2],
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8 [
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9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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10 AC_REQUIRE([AC_CANONICAL_HOST])
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11 AC_CHECK_FUNCS_ONCE([getdtablesize])
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12 m4_ifdef([gl_FUNC_DUP2_OBSOLETE], [
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13 AC_CHECK_FUNCS_ONCE([dup2])
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14 if test $ac_cv_func_dup2 = no; then
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15 HAVE_DUP2=0
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16 fi
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17 ], [
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18 AC_DEFINE([HAVE_DUP2], [1], [Define to 1 if you have the 'dup2' function.])
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19 ])
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20 if test $HAVE_DUP2 = 1; then
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21 AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works],
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22 [AC_RUN_IFELSE([
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23 AC_LANG_PROGRAM([[#include <unistd.h>
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24 #include <fcntl.h>
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25 #include <errno.h>]],
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26 [int result = 0;
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27 #ifdef HAVE_GETDTABLESIZE
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28 int bad_fd = getdtablesize ();
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29 #else
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30 int bad_fd = 1000000;
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31 #endif
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32 #ifdef FD_CLOEXEC
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33 if (fcntl (1, F_SETFD, FD_CLOEXEC) == -1)
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34 result |= 1;
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35 #endif
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36 if (dup2 (1, 1) == 0)
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37 result |= 2;
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38 #ifdef FD_CLOEXEC
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39 if (fcntl (1, F_GETFD) != FD_CLOEXEC)
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40 result |= 4;
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41 #endif
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42 close (0);
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43 if (dup2 (0, 0) != -1)
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44 result |= 8;
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45 /* Many gnulib modules require POSIX conformance of EBADF. */
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46 if (dup2 (2, bad_fd) == -1 && errno != EBADF)
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47 result |= 16;
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48 /* Flush out some cygwin core dumps. */
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49 if (dup2 (2, -1) != -1 || errno != EBADF)
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50 result |= 32;
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51 dup2 (2, 255);
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52 dup2 (2, 256);
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53 return result;
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54 ])
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55 ],
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56 [gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no],
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57 [case "$host_os" in
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58 mingw*) # on this platform, dup2 always returns 0 for success
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59 gl_cv_func_dup2_works="guessing no" ;;
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60 cygwin*) # on cygwin 1.5.x, dup2(1,1) returns 0
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61 gl_cv_func_dup2_works="guessing no" ;;
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62 linux*) # On linux between 2008-07-27 and 2009-05-11, dup2 of a
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63 # closed fd may yield -EBADF instead of -1 / errno=EBADF.
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64 gl_cv_func_dup2_works="guessing no" ;;
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65 aix* | freebsd*)
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66 # on AIX 7.1 and FreeBSD 6.1, dup2 (1,toobig) gives EMFILE,
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67 # not EBADF.
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68 gl_cv_func_dup2_works="guessing no" ;;
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69 haiku*) # on Haiku alpha 2, dup2(1, 1) resets FD_CLOEXEC.
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70 gl_cv_func_dup2_works="guessing no" ;;
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71 *) gl_cv_func_dup2_works="guessing yes" ;;
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72 esac])
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73 ])
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74 case "$gl_cv_func_dup2_works" in
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75 *yes) ;;
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76 *)
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77 REPLACE_DUP2=1
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78 AC_CHECK_FUNCS([setdtablesize])
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79 ;;
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80 esac
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81 fi
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82 dnl Replace dup2() for supporting the gnulib-defined fchdir() function,
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83 dnl to keep fchdir's bookkeeping up-to-date.
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84 m4_ifdef([gl_FUNC_FCHDIR], [
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85 gl_TEST_FCHDIR
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86 if test $HAVE_FCHDIR = 0; then
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87 if test $HAVE_DUP2 = 1; then
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88 REPLACE_DUP2=1
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89 fi
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90 fi
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91 ])
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92 ])
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93
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94 # Prerequisites of lib/dup2.c.
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95 AC_DEFUN([gl_PREREQ_DUP2], [])