usage: valgrind [options] prog-and-args

  common user options for all Valgrind tools, with defaults in [ ]:
    --tool=<name>             use the Valgrind tool named <name> [memcheck]
    -h --help                 show this message
    --help-debug              show this message, plus debugging options
    --version                 show version
    -q --quiet                run silently; only print error msgs
    -v --verbose              be more verbose, incl counts of errors
    --trace-children=no|yes   Valgrind-ise child processes (follow execve)? [no]
    --child-silent-after-fork=no|yes  omit child output between fork & exec? [no]
    --track-fds=no|yes        track open file descriptors? [no]
    --time-stamp=no|yes       add timestamps to log messages? [no]
    --log-fd=<number>         log messages to file descriptor [2=stderr]
    --log-file=<file>         log messages to <file>
    --log-socket=ipaddr:port  log messages to socket ipaddr:port

  uncommon user options for all Valgrind tools:
    --run-libc-freeres=no|yes free up glibc memory at exit? [yes]
    --sim-hints=hint1,hint2,...  known hints:
                                 lax-ioctls, enable-outer [none]
    --show-emwarns=no|yes     show warnings about emulation limits? [no]
    --smc-check=none|stack|all  checks for self-modifying code: none,
                              only for code found in stacks, or all [stack]
    --kernel-variant=variant1,variant2,...  known variants: bproc [none]
                              handle non-standard kernel variants

  user options for Valgrind tools that report errors:
    --xml=yes                 all output is in XML (some tools only)
    --xml-user-comment=STR    copy STR verbatim to XML output
    --demangle=no|yes         automatically demangle C++ names? [yes]
    --num-callers=<number>    show <number> callers in stack traces [12]
    --error-limit=no|yes      stop showing new errors if too many? [yes]
    --error-exitcode=<number> exit code to return if errors found [0=disable]
    --show-below-main=no|yes  continue stack traces below main() [no]
    --suppressions=<filename> suppress errors described in <filename>
    --gen-suppressions=no|yes|all    print suppressions for errors? [no]
    --db-attach=no|yes        start debugger when errors detected? [no]
    --db-command=<command>    command to start debugger [/usr/bin/gdb -nw %f %p]
    --input-fd=<number>       file descriptor for input [0=stdin]
    --max-stackframe=<number> assume stack switch for SP changes larger
                              than <number> bytes [2000000]
    --main-stacksize=<number> set size of main thread's stack (in bytes)
                              [use current 'ulimit' value]

  user options for Nulgrind:
    (none)

  Extra options read from ~/.valgrindrc, $VALGRIND_OPTS, ./.valgrindrc

  Valgrind is Copyright (C) 2000-2008 Julian Seward et al.
  and licensed under the GNU General Public License, version 2.
  Bug reports, feedback, admiration, abuse, etc, to: www.valgrind.org.

  Tools are copyright and licensed by their authors.  See each
  tool's start-up message for more information.