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Diffstat (limited to '')
| -rw-r--r-- | gl/m4/readlinkat.m4 | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/gl/m4/readlinkat.m4 b/gl/m4/readlinkat.m4 new file mode 100644 index 0000000..63c5205 --- /dev/null +++ b/gl/m4/readlinkat.m4 @@ -0,0 +1,39 @@ +# serial 6 +# See if we need to provide readlinkat replacement. + +dnl Copyright (C) 2009-2022 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +# Written by Eric Blake. + +AC_DEFUN([gl_FUNC_READLINKAT], +[ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + AC_CHECK_FUNCS_ONCE([readlinkat]) + AC_REQUIRE([gl_FUNC_READLINK]) + if test $ac_cv_func_readlinkat = no; then + HAVE_READLINKAT=0 + else + AC_CACHE_CHECK([whether readlinkat signature is correct], + [gl_cv_decl_readlinkat_works], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <unistd.h> + /* Check whether original declaration has correct type. */ + ssize_t readlinkat (int, char const *, char *, size_t);]])], + [gl_cv_decl_readlinkat_works=yes], + [gl_cv_decl_readlinkat_works=no])]) + # Assume readlinkat has the same bugs as readlink, + # as is the case on OS X 10.10 with trailing slashes. + case $gl_cv_decl_readlinkat_works,$gl_cv_func_readlink_trailing_slash,$gl_cv_func_readlink_truncate in + *yes,*yes,*yes) + ;; + *) + REPLACE_READLINKAT=1 + ;; + esac + fi +]) |