diff options
Diffstat (limited to 'ext/zlib')
| -rw-r--r-- | ext/zlib/zlib.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c index 25b3e7afab..66e68916a8 100644 --- a/ext/zlib/zlib.c +++ b/ext/zlib/zlib.c @@ -3221,7 +3221,20 @@ rb_gzfile_set_lineno(VALUE obj, VALUE lineno) * Document-method: Zlib::GzipWriter#mtime= * * Specify the modification time (+mtime+) in the gzip header. - * Using a Fixnum or Integer + * Using a Fixnum or Integer. + * + * Setting the mtime in the gzip header does not effect the + * mtime of the file generated. Different utilities that + * expand the gzipped files may use the mtime + * header. For example the gunzip utility can use the `-N` + * flag which will set the resultant file's mtime to the + * value in the header. By default many tools will set + * the mtime of the expanded file to the mtime of the + * gzipped file, not the mtime in the header. + * + * If you do not set an mtime, the default value will be the time + * when compression started. Setting a value of 0 indicates + * no time stamp is available. */ static VALUE rb_gzfile_set_mtime(VALUE obj, VALUE mtime) |