Hi Michael, It seems the old description applies to all 2.0, 2.2, and 2.3 kernels up to and including 2.3.26. After that the behavior changed as explained in my patch.
Regards, Fernando On Mon, 2008-02-11 at 17:30 +0100, Michael Kerrisk wrote: > Fernando, > > Do you know when (which kernel version) this change in behavior occurred? > > Cheers, > > Michael > > Fernando Luis Vázquez Cao wrote: > > It used to be true that the command line arguments were not accessible > > when the process had been swapped out. In ancient kernels (circa 2.0.*) > > the problem was that the kernel relied on get_phys_addr to access the > > user space buffer, which stopped working as soon as the process was > > swapped out. Recent kernels use get_user_pages for the same purpose and > > thus they should not have that limitation. > > > > Signed-off-by: Fernando Luis Vazquez Cao <[EMAIL PROTECTED]> > > --- > > > > --- proc.5.orig 2008-02-06 14:11:58.000000000 +0900 > > +++ proc.5 2008-02-06 14:56:22.000000000 +0900 > > @@ -87,12 +87,11 @@ plus one \fIunsigned long\fP value for e > > The last entry contains two zeros. > > .TP > > .I /proc/[number]/cmdline > > -This holds the complete command line for the process, unless the whole > > -process has been swapped out or the process is a zombie. > > -In either of these latter cases, there is nothing in this file: > > -that is, a read on this file will return 0 characters. > > -The command line arguments appear in this file as a set of > > -null-separated strings, with a further null byte after the last string. > > +This holds the complete command line for the process, unless the process > > is a > > +zombie. In the latter case, there is nothing in this file: that is, a read > > on > > +this file will return 0 characters. The command line arguments appear in > > this > > +file as a set of null-separated strings, with a further null byte after the > > +last string. > > .TP > > .I /proc/[number]/cwd > > This is a symbolic link to the current working directory of the process. > > > > > > > - To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
