| 1 | # serial 24
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| 2 |
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| 3 | # Copyright (C) 1997-2001, 2003-2012 Free Software Foundation, Inc.
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| 4 | #
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| 5 | # This file is free software; the Free Software Foundation
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| 6 | # gives unlimited permission to copy and/or distribute it,
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| 7 | # with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | dnl From Jim Meyering.
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| 10 |
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| 11 | AC_DEFUN([gl_FUNC_LSTAT],
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| 12 | [
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| 13 | AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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| 14 | dnl If lstat does not exist, the replacement <sys/stat.h> does
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| 15 | dnl "#define lstat stat", and lstat.c is a no-op.
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| 16 | AC_CHECK_FUNCS_ONCE([lstat])
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| 17 | if test $ac_cv_func_lstat = yes; then
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| 18 | AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
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| 19 | if test $gl_cv_func_lstat_dereferences_slashed_symlink = no; then
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| 20 | REPLACE_LSTAT=1
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| 21 | fi
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| 22 | else
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| 23 | HAVE_LSTAT=0
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| 24 | fi
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| 25 | ])
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| 26 |
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| 27 | # Prerequisites of lib/lstat.c.
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| 28 | AC_DEFUN([gl_PREREQ_LSTAT],
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| 29 | [
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| 30 | AC_REQUIRE([AC_C_INLINE])
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| 31 | :
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| 32 | ])
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| 33 |
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| 34 | AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK],
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| 35 | [
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| 36 | dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it
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| 37 | dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ.
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| 38 | AC_CACHE_CHECK([whether lstat correctly handles trailing slash],
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| 39 | [gl_cv_func_lstat_dereferences_slashed_symlink],
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| 40 | [rm -f conftest.sym conftest.file
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| 41 | echo >conftest.file
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| 42 | if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then
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| 43 | AC_RUN_IFELSE(
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| 44 | [AC_LANG_PROGRAM(
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| 45 | [AC_INCLUDES_DEFAULT],
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| 46 | [[struct stat sbuf;
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| 47 | /* Linux will dereference the symlink and fail, as required by
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| 48 | POSIX. That is better in the sense that it means we will not
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| 49 | have to compile and use the lstat wrapper. */
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| 50 | return lstat ("conftest.sym/", &sbuf) == 0;
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| 51 | ]])],
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| 52 | [gl_cv_func_lstat_dereferences_slashed_symlink=yes],
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| 53 | [gl_cv_func_lstat_dereferences_slashed_symlink=no],
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| 54 | [# When cross-compiling, be pessimistic so we will end up using the
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| 55 | # replacement version of lstat that checks for trailing slashes and
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| 56 | # calls lstat a second time when necessary.
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| 57 | gl_cv_func_lstat_dereferences_slashed_symlink=no
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| 58 | ])
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| 59 | else
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| 60 | # If the 'ln -s' command failed, then we probably don't even
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| 61 | # have an lstat function.
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| 62 | gl_cv_func_lstat_dereferences_slashed_symlink=no
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| 63 | fi
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| 64 | rm -f conftest.sym conftest.file
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| 65 | ])
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| 66 | test $gl_cv_func_lstat_dereferences_slashed_symlink = yes &&
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| 67 | AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1],
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| 68 | [Define to 1 if 'lstat' dereferences a symlink specified
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| 69 | with a trailing slash.])
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| 70 | ])
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