SERVER-24572 Add support for collecting information from /proc/stat

2 files changed, 22 insertions, 3 deletions

diff --git a/src/mongo/base/error_codes.err b/src/mongo/base/error_codes.err
index 3979f9bdf59..aa3c0b24803 100644
--- a/src/mongo/base/error_codes.err
+++ b/src/mongo/base/error_codes.err
@@ -172,6 +172,7 @@ error_code("TooManyMatchingDocuments", 170)
 error_code("CannotIndexParallelArrays", 171)
 error_code("TransportSessionNotFound", 172)
 error_code("QueryPlanKilled", 173)
+error_code("FileOpenFailed", 174)
 
 # Non-sequential error codes (for compatibility only)
 error_code("SocketException", 9001)
diff --git a/src/mongo/base/string_data.h b/src/mongo/base/string_data.h
index b1491b919e6..98a4dc6f7f1 100644
--- a/src/mongo/base/string_data.h
+++ b/src/mongo/base/string_data.h
@@ -36,6 +36,7 @@
 #include <stdexcept>
 #include <string>
 
+#include "mongo/stdx/type_traits.h"
 #define MONGO_INCLUDE_INVARIANT_H_WHITELISTED
 #include "mongo/util/invariant.h"
 #undef MONGO_INCLUDE_INVARIANT_H_WHITELISTED
@@ -63,6 +64,9 @@ public:
     // Declared in string_data_comparator_interface.h.
     class ComparatorInterface;
 
+    // Iterator type
+    using const_iterator = const char*;
+
     /** Constructs an empty StringData. */
     constexpr StringData() = default;
 
@@ -98,6 +102,23 @@ public:
     constexpr friend StringData operator"" _sd(const char* c, std::size_t len);
 
     /**
+     * Constructs a StringData with begin and end iterators. begin points to the beginning of the
+     * string. end points to the position past the end of the string. In a null-terminated string,
+     * end points to the null-terminator.
+     *
+     * We template the second parameter to ensure if StringData is called with 0 in the second
+     * parameter, the (ptr,len) constructor is chosen instead.
+     */
+    template <
+        typename InputIt,
+        typename = stdx::enable_if_t<std::is_same<StringData::const_iterator, InputIt>::value>>
+    StringData(InputIt begin, InputIt end) {
+        invariant(begin && end);
+        _data = begin;
+        _size = std::distance(begin, end);
+    }
+
+    /**
      * Returns -1, 0, or 1 if 'this' is less, equal, or greater than 'other' in
      * lexicographical order.
      */
@@ -170,9 +191,6 @@ public:
     //
     // iterators
     //
-
-    typedef const char* const_iterator;
-
     const_iterator begin() const {
         return rawData();
     }