| 1 | #serial 16
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| 2 | # Determine whether we need the chown wrapper.
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| 3 |
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| 4 | dnl Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
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| 5 | dnl Software Foundation, Inc.
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| 6 |
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| 7 | dnl This file is free software; the Free Software Foundation
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| 8 | dnl gives unlimited permission to copy and/or distribute it,
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| 9 | dnl with or without modifications, as long as this notice is preserved.
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| 10 |
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| 11 | # chown should accept arguments of -1 for uid and gid, and it should
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| 12 | # dereference symlinks. If it doesn't, arrange to use the replacement
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| 13 | # function.
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| 14 |
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| 15 | # From Jim Meyering.
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| 16 |
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| 17 | AC_DEFUN([gl_FUNC_CHOWN],
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| 18 | [
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| 19 | AC_REQUIRE([AC_TYPE_UID_T])
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| 20 | AC_REQUIRE([AC_FUNC_CHOWN])
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| 21 | AC_REQUIRE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK])
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| 22 |
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| 23 | if test $ac_cv_func_chown_works = no; then
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| 24 | AC_DEFINE(CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE, 1,
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| 25 | [Define if chown is not POSIX compliant regarding IDs of -1.])
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| 26 | fi
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| 27 |
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| 28 | # If chown has either of the above problems, then we need the wrapper.
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| 29 | if test $ac_cv_func_chown_works$gl_cv_func_chown_follows_symlink = yesyes; then
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| 30 | : # no wrapper needed
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| 31 | else
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| 32 | AC_LIBOBJ(chown)
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| 33 | AC_DEFINE(chown, rpl_chown,
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| 34 | [Define to rpl_chown if the replacement function should be used.])
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| 35 | gl_PREREQ_CHOWN
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| 36 | fi
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| 37 | ])
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| 38 |
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| 39 | # Determine whether chown follows symlinks (it should).
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| 40 | AC_DEFUN([gl_FUNC_CHOWN_FOLLOWS_SYMLINK],
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| 41 | [
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| 42 | AC_CACHE_CHECK(
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| 43 | [whether chown(2) dereferences symlinks],
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| 44 | gl_cv_func_chown_follows_symlink,
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| 45 | [
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| 46 | AC_RUN_IFELSE([AC_LANG_SOURCE([[
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| 47 | #include <unistd.h>
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| 48 | #include <stdlib.h>
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| 49 | #include <errno.h>
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| 50 |
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| 51 | int
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| 52 | main ()
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| 53 | {
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| 54 | char const *dangling_symlink = "conftest.dangle";
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| 55 |
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| 56 | unlink (dangling_symlink);
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| 57 | if (symlink ("conftest.no-such", dangling_symlink))
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| 58 | abort ();
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| 59 |
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| 60 | /* Exit successfully on a conforming system,
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| 61 | i.e., where chown must fail with ENOENT. */
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| 62 | exit ( ! (chown (dangling_symlink, getuid (), getgid ()) != 0
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| 63 | && errno == ENOENT));
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| 64 | }
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| 65 | ]])],
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| 66 | [gl_cv_func_chown_follows_symlink=yes],
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| 67 | [gl_cv_func_chown_follows_symlink=no],
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| 68 | [gl_cv_func_chown_follows_symlink=yes]
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| 69 | )
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| 70 | ]
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| 71 | )
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| 72 |
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| 73 | if test $gl_cv_func_chown_follows_symlink = no; then
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| 74 | AC_DEFINE(CHOWN_MODIFIES_SYMLINK, 1,
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| 75 | [Define if chown modifies symlinks.])
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| 76 | fi
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| 77 | ])
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| 78 |
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| 79 | # Prerequisites of lib/chown.c.
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| 80 | AC_DEFUN([gl_PREREQ_CHOWN],
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| 81 | [
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| 82 | AC_CHECK_FUNC([fchown], , [AC_LIBOBJ(fchown-stub)])
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| 83 | ])
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