os: Add facilities for client ID tracking.

An interface is provided for figuring out the PID and process name of
a client. Make some existing functionality from SELinux and IA
extensions available for general use.

Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>
Reviewed-by: Tiago Vignatti <tiago.vignatti@nokia.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/include/client.h b/include/client.h
new file mode 100644
index 000000000..aaafc7da6
--- /dev/null
+++ b/include/client.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). All
+ * rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* Author: Rami Ylimäki <rami.ylimaki@vincit.fi> */
+
+#ifndef CLIENT_H
+#define CLIENT_H
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif /* HAVE_DIX_CONFIG_H */
+#include <X11/Xfuncproto.h>
+#include <sys/types.h>
+
+/* Client IDs. Use GetClientPid, GetClientCmdName and GetClientCmdArgs
+ * instead of accessing the fields directly. */
+typedef struct {
+    pid_t pid;           /* process ID, -1 if not available */
+    const char *cmdname; /* process name, NULL if not available */
+    const char *cmdargs; /* process arguments, NULL if not available */
+} ClientIdRec, *ClientIdPtr;
+
+struct _Client;
+
+/* Initialize and clean up. */
+void ReserveClientIds(struct _Client *client);
+void ReleaseClientIds(struct _Client *client);
+
+/* Determine client IDs for caching. Exported on purpose for
+ * extensions such as SELinux. */
+extern _X_EXPORT pid_t DetermineClientPid(struct _Client *client);
+extern _X_EXPORT void DetermineClientCmd(pid_t, const char **cmdname, const char **cmdargs);
+
+/* Query cached client IDs. Exported on purpose for drivers. */
+extern _X_EXPORT pid_t GetClientPid(struct _Client *client);
+extern _X_EXPORT const char *GetClientCmdName(struct _Client *client);
+extern _X_EXPORT const char *GetClientCmdArgs(struct _Client *client);
+
+#endif /* CLIENT_H */