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authorEelco Dolstra <e.dolstra@tudelft.nl>2012-03-05T18·19+0100
committerEelco Dolstra <e.dolstra@tudelft.nl>2012-03-05T18·19+0100
commit1d487dc6a682468ae00402b3720ff412b6bfb6fc (patch)
tree94311d8c9b57893255bf613be84fb1cc8b924f55 /src/nix-worker/nix-worker.cc
parent2b4964f31979b5227a7a51b646d2e4bbb5ef6579 (diff)
nix-worker: put the pid of the caller in argv[1]
This is useful for debugging.
Diffstat (limited to 'src/nix-worker/nix-worker.cc')
-rw-r--r--src/nix-worker/nix-worker.cc21
1 files changed, 20 insertions, 1 deletions
diff --git a/src/nix-worker/nix-worker.cc b/src/nix-worker/nix-worker.cc
index eaa686667306..7ca54dee99be 100644
--- a/src/nix-worker/nix-worker.cc
+++ b/src/nix-worker/nix-worker.cc
@@ -753,8 +753,21 @@ static void daemonLoop()
 		    throw SysError("accepting connection");
             }
 
-            printMsg(lvlInfo, format("accepted connection %1%") % remote);
+            /* Get the identity of the caller, if possible. */
+            uid_t clientUid = -1;
+            pid_t clientPid = -1;
+
+#if defined(SO_PEERCRED)
+            ucred cred;
+            socklen_t credLen = sizeof(cred);
+            if (getsockopt(remote, SOL_SOCKET, SO_PEERCRED, &cred, &credLen) != -1) {
+                clientPid = cred.pid;
+                clientUid = cred.uid;
+            }
+#endif
 
+            printMsg(lvlInfo, format("accepted connection from pid %1%, uid %2%") % clientPid % clientUid);
+            
             /* Fork a child to handle the connection. */
             pid_t child;
             child = fork();
@@ -774,6 +787,12 @@ static void daemonLoop()
                     /* Restore normal handling of SIGCHLD. */
                     setSigChldAction(false);
 
+                    /* For debugging, stuff the pid into argv[1]. */
+                    if (clientPid != -1 && argvSaved[1]) {
+                        string processName = int2String(clientPid);
+                        strncpy(argvSaved[1], processName.c_str(), strlen(argvSaved[1]));
+                    }
+                    
                     /* Since the daemon can be long-running, the
                        settings may have changed.  So force a reload. */
                     reloadSettings();