instance method
FileTest#setuid?
(::path | ::io file_name) -> bool
File.setuid?(file_name) → true or false
file.c
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static VALUE
rb_file_suid_p(VALUE obj, VALUE fname)
{
#ifdef S_ISUID
return check3rdbyte(fname, S_ISUID);
#else
return Qfalse;
#endif
}
Returns true if the named file has the setuid bit set.
file_name can be an IO object.