File::Stat#birthtime

gistfile1.diff

diff --git a/configure.in b/configure.in
index 0bbc444..da8d58d 100644
--- a/configure.in
+++ b/configure.in
@@ -1171,6 +1171,8 @@ AC_CHECK_MEMBERS([struct stat.st_mtimensec])
 AC_CHECK_MEMBERS([struct stat.st_ctim])
 AC_CHECK_MEMBERS([struct stat.st_ctimespec])
 AC_CHECK_MEMBERS([struct stat.st_ctimensec])
+AC_CHECK_MEMBERS([struct stat.st_birthtimespec])
+AC_CHECK_MEMBERS([struct stat.st_birthtimensec])
 
 AC_CHECK_TYPES([struct timespec], [], [], [@%:@ifdef HAVE_TIME_H
 @%:@include <time.h>
diff --git a/file.c b/file.c
index 81f28ff..9200555 100644
--- a/file.c
+++ b/file.c
@@ -671,6 +671,28 @@ stat_ctime(struct stat *st)
     return rb_time_nano_new(ts.tv_sec, ts.tv_nsec);
 }
 
+static struct timespec
+stat_birthtimespec(struct stat *st)
+{
+    struct timespec ts;
+    ts.tv_sec = st->st_birthtime;
+#if defined(HAVE_STRUCT_STAT_ST_CTIMESPEC)
+    ts.tv_nsec = st->st_birthtimespec.tv_nsec;
+#elif defined(HAVE_STRUCT_STAT_ST_CTIMENSEC)
+    ts.tv_nsec = st->st_birthtimensec;
+#else
+    ts.tv_nsec = 0;
+#endif
+    return ts;
+}
+
+static VALUE
+stat_birthtime(struct stat *st)
+{
+    struct timespec ts = stat_birthtimespec(st);
+    return rb_time_nano_new(ts.tv_sec, ts.tv_nsec);
+}
+
 /*
  *  call-seq:
  *     stat.atime   -> time
@@ -725,6 +747,21 @@ rb_stat_ctime(VALUE self)
 }
 
 /*
+ *  call-seq:
+ *     stat.birthtime  ->  birthTime
+ *
+ *  Returns the birth time (creation time) for <i>stat</i> (that is, the time
+ *  the file was created).
+ *
+ */
+
+static VALUE
+rb_stat_birthtime(VALUE self)
+{
+    return stat_birthtime(get_stat(self));
+}
+
+/*
  * call-seq:
  *   stat.inspect  ->  string
  *
@@ -5422,6 +5459,7 @@ Init_File(void)
     rb_define_method(rb_cStat, "atime", rb_stat_atime, 0);
     rb_define_method(rb_cStat, "mtime", rb_stat_mtime, 0);
     rb_define_method(rb_cStat, "ctime", rb_stat_ctime, 0);
+    rb_define_method(rb_cStat, "birthtime", rb_stat_birthtime, 0);
 
     rb_define_method(rb_cStat, "inspect", rb_stat_inspect, 0);