Use O_NOATIME to avoid disturbing st_atime when possible. Closes issue #230

src/internfile/mh_mail.cpp

@@ -111,6 +111,11 @@ bool MimeHandlerMail::set_document_file(const string& mt, const string &fn)
 		fn.c_str(), errno));
 	return false;
     }
+#if defined O_NOATIME && O_NOATIME != 0
+    if (fcntl(m_fd, F_SETFL, O_NOATIME) < 0) {
+        // perror("fcntl");
+    }
+#endif
     delete m_bincdoc;
     m_bincdoc = new Binc::MimeDocument;
     m_bincdoc->parseFull(m_fd);

src/internfile/mh_mbox.cpp

@@ -267,6 +267,11 @@ bool MimeHandlerMbox::set_document_file(const string& mt, const string &fn)
 		fn.c_str()));
 	return false;
     }
+#if defined O_NOATIME && O_NOATIME != 0
+    if (fcntl(fileno((FILE *)m_vfp), F_SETFL, O_NOATIME) < 0) {
+        // perror("fcntl");
+    }
+#endif
     fseek((FILE *)m_vfp, 0, SEEK_END);
     m_fsize = ftell((FILE*)m_vfp);
     fseek((FILE*)m_vfp, 0, SEEK_SET);

src/utils/readfile.cpp

@@ -103,6 +103,12 @@ bool file_scan(const string &fn, FileScanDo* doer, off_t startoffs,
 	noclosing = false;
     }
 
+#if defined O_NOATIME && O_NOATIME != 0
+    if (fcntl(fd, F_SETFL, O_NOATIME) < 0) {
+        // perror("fcntl");
+    }
+#endif
+
     if (cnttoread != (size_t)-1 && cnttoread) {
 	doer->init(cnttoread+1, reason);
     } else if (st.st_size > 0) {