[META/MOD] Modify changelog and config page.

Schema/Config.json

@@ -75,6 +75,7 @@
         "serverName":     { "type": "string",           "required": true },
         "baseUrl":        { "type": "string",           "required": false },
         "identityServer": { "type": "string",           "required": false },
+        "pid":            { "type": "string",           "required": false },
 
         "maxCache":       { "type": "integer",          "required": false },
 

docs/CHANGELOG.md

@@ -31,6 +31,7 @@ The following endpoints were added:
 
 ### Bug Fixes & General Improvements
 
+- Use `j2s` for parsing the configuration
 - Fixed a double-free in `RouteUserProfile()` that would cause errors
 with certain Matrix clients. (#35)
 - Improved compatibility with NetBSD on various platforms.
@@ -43,6 +44,8 @@ parsing request bodies.
 
 ### New Features
 
+- Implemented a `"pid"` option in the configuration, allowing Telodendria 
+to write its process ID to a specified file.
 - Moved all administrator API endpoints to `/_telodendria/admin/v1`,
 because later revisions of the administrator API may break clients, so
 we want a way to give those breaking revisions new endpoints.

docs/user/config.md

@@ -106,6 +106,9 @@ Here are the top-level directives:
   or you want to start over. **serverName** should be a DNS name that
   can be publicly resolved. This directive is required.
 
+- **pid:** `String`
+  Configure the file Telodendria writes its PID to.
+
 - **baseUrl:** `String`
 
   Set the server's base URL. **baseUrl** should be a valid URL,

src/Main.c

@@ -104,6 +104,9 @@ Main(Array * args)
     /* Program configuration */
     Config *tConfig;
     Stream *logFile;
+    Stream *pidFile = NULL;
+
+    char *pidPath = NULL;
 
     /* User validation */
     struct passwd *userInfo;
@@ -335,6 +338,21 @@ start:
         Free(token);
     }
 
+    if (tConfig->pid)
+    {
+        pidFile = StreamOpen(tConfig->pid, "w+");
+        if (!pidFile)
+        {
+            char *msg = "Couldn't lock PID file at '%s'";
+            Log(LOG_ERR, msg, tConfig->pid);
+            exit = EXIT_FAILURE;
+            goto finish;
+        }
+        pidPath = StrDuplicate(tConfig->pid);
+        StreamPrintf(pidFile, "%ld", (long) getpid());
+        StreamClose(pidFile);
+    }
+
     Log(LOG_DEBUG, "Configuration:");
     LogConfigIndent(LogConfigGlobal());
     Log(LOG_DEBUG, "Server Name: %s", tConfig->serverName);
@@ -604,6 +622,12 @@ finish:
     HttpRouterFree(matrixArgs.router);
     Log(LOG_DEBUG, "Freed routing tree.");
 
+    if (pidPath)
+    {
+        remove(pidPath);
+        Free(pidPath);
+    }
+
     /*
      * Uninstall the memory hook because it uses the Log
      * API, whose configuration is being freed now, so it