On Linux/glibc there is no official setproctitle(), but we have one that works by mutating 
argv (which is the "approved" way to do it from the kernel's point of view) and has the 
same interface as the BSD version. It has lots of bounds checking and knows how to 
move environment variables out of the way to ensure that we only overwrite the right 
things. It should be used rather than overwriting argv[0] directly.

The kernel has two places where it exposes information about process' names. One, the 
target of /proc/N/exe, is immutable. It contains the full path that was used to execute 
the binary and is only changed on exec*(). The other, /proc/N/cmdline, is a pointer into 
the process' argv array and can be changed by setproctitle(). Some process viewing 
tools only look at the exe symlink; for these tools, there is nothing we can do to change 
what they will display. Other tools will look at cmdline, or have an option to do so - for 
example the c key toggles between these modes in top.

Previously I had thought that all the current GUI tools would only look at the exe link, 
although recently I discovered that at least the GNOME process viewer can be set to 
look at the cmdline instead (although it's not an obvious setting).

Turns out there is also another way to change process names in Linux: 
prctl(PR_SET_NAME). This changes the short name that shows in top, for instance. I've 
got a CL that puts all these pieces together and fixes this issue ready to check in: 
http://codereview.chromium.org/490028

The following revision refers to this bug:
    http://src.chromium.org/viewvc/chrome?view=rev&revision=35441 

------------------------------------------------------------------------
r35441 | mdm@chromium.org | 2010-01-02 18:20:08 -0800 (Sat, 02 Jan 2010) | 5 lines
Changed paths:
   M http://src.chromium.org/viewvc/chrome/trunk/src/base/command_line.cc?r1=35441&r2=35440
   M http://src.chromium.org/viewvc/chrome/trunk/src/base/setproctitle_linux.h?r1=35441&r2=35440
   M http://src.chromium.org/viewvc/chrome/trunk/src/chrome/plugin/plugin_main.cc?r1=35441&r2=35440

Linux: use readlink() and prctl() in SetProcTitle() to fix "exe" showing in process listings.
BUG= 29118 
TEST=none

Review URL: http://codereview.chromium.org/490028
------------------------------------------------------------------------

The following revision refers to this bug:
    http://src.chromium.org/viewvc/chrome?view=rev&revision=35660 

------------------------------------------------------------------------
r35660 | thestig@chromium.org | 2010-01-06 14:50:27 -0800 (Wed, 06 Jan 2010) | 8 lines
Changed paths:
   M http://src.chromium.org/viewvc/chrome/branches/249/src/base/command_line.cc?r1=35660&r2=35659
   M http://src.chromium.org/viewvc/chrome/branches/249/src/base/setproctitle_linux.h?r1=35660&r2=35659
   M http://src.chromium.org/viewvc/chrome/branches/249/src/chrome/plugin/plugin_main.cc?r1=35660&r2=35659

Merge 35441 - Linux: use readlink() and prctl() in SetProcTitle() to fix "exe" showing in process listings.
BUG= 29118 
TEST=none

Review URL: http://codereview.chromium.org/490028

TBR=mdm@chromium.org
Review URL: http://codereview.chromium.org/523106
------------------------------------------------------------------------

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