usage: valgrind --tool=<toolname> [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? [no]
    --track-fds=no|yes        track open file descriptors? [no]
    --time-stamp=no|yes       add timestamps to log messages? [no]

  uncommon user options for all Valgrind tools:
    --run-libc-freeres=no|yes free up glibc memory at exit? [yes]
    --weird-hacks=hack1,hack2,...  recognised hacks: lax-ioctls,ioctl-mmap [none]
    --pointercheck=no|yes     enforce client address space limits [yes]
    --support-elan3=no|yes    hacks for Quadrics Elan3 support [no]

  user options for Valgrind tools that report errors:
    --log-fd=<number>         log messages to file descriptor [2=stderr]
    --log-file=<file>         log messages to <file>.pid<pid>
    --log-file-exactly=<file> log messages to <file>
    --log-socket=ipaddr:port  log messages to socket ipaddr:port
    --demangle=no|yes         automatically demangle C++ names? [yes]
    --num-callers=<number>    show <num> callers in stack traces [4]
    --error-limit=no|yes      stop showing new errors if too many? [yes]
    --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 [gdb -nw %f %p]
    --input-fd=<number>       file descriptor for input [0=stdin]

  user options for Nulgrind:
    (none)

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

  Valgrind is Copyright (C) 2000-2004 Julian Seward et al.
  and licensed under the GNU General Public License, version 2.
  Bug reports, feedback, admiration, abuse, etc, to: valgrind.kde.org.

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