lkml.org 
[lkml]   [2002]   [Oct]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] 2.4: get_pid() typo fix
From
Date
Magnificent Marcelo,

Fix a typo in the comment of getpid() - we return current->tgid these
days, not current->pid. Additionally, add some new comments explaining
exactly why we return the tgid and how this works.

Patch is against 2.4.20-pre9, please apply.

Robert Love

diff -urN linux-2.4.20-pre9/kernel/timer.c linux/kernel/timer.c
--- linux-2.4.20-pre9/kernel/timer.c 2002-10-06 14:57:20.000000000 -0400
+++ linux/kernel/timer.c 2002-10-06 15:03:31.000000000 -0400
@@ -740,10 +740,18 @@
* The Alpha uses getxpid, getxuid, and getxgid instead. Maybe this
* should be moved into arch/i386 instead?
*/
-
+
+/**
+ * sys_getpid - return the thread group id of the current process
+ *
+ * Note, despite the name, this returns the tgid not the pid. The tgid and
+ * the pid are identical unless CLONE_THREAD was specified on clone() in
+ * which case the tgid is the same in all threads of the same group.
+ *
+ * This is SMP safe as current->tgid does not change.
+ */
asmlinkage long sys_getpid(void)
{
- /* This is SMP safe - current->pid doesn't change */
return current->tgid;
}



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:29    [W:0.049 / U:3.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site