With --nacl-loader-cmd-prefix option you can prepend any text to the command line of the nacl-loader process. This is only supported on POSIX. Example: chrome --nacl-loader-cmd-prefix=strace It can also be used to run NaCl modules under Valgrind. For this, you will need a Debug build of Chromium and a Valgrind-compatible build of the nexe. Valgrind instructions can be found here. Create a script (vg.sh) with the following contents: #!/bin/bash NACL_FILE=/path/to/nexe/dbg.nexe /path/to/valgrind/memcheck.sh -v --nacl-file=$NACL_FILE --log-file=vg.log "$@" memcheck.sh can be found either in nacl-sdk or in a NaCl repository checkout. Then, run: chrome --nacl-loader-cmd-prefix=./vg.sh |
Running the nacl-loader process under various debugging tools |