diff options
Diffstat (limited to 'Modules/main.c')
| -rw-r--r-- | Modules/main.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/Modules/main.c b/Modules/main.c index a13d166382..6d1ae9ed68 100644 --- a/Modules/main.c +++ b/Modules/main.c @@ -40,7 +40,7 @@ static char **orig_argv; static int orig_argc; /* command line options */ -#define BASE_OPTS "3bBc:dEhiJm:OQ:sStuUvVW:xX?" +#define BASE_OPTS "3bBc:dEhiJm:OQ:RsStuUvVW:xX?" #ifndef RISCOS #define PROGRAM_OPTS BASE_OPTS @@ -71,6 +71,9 @@ static char *usage_2 = "\ -m mod : run library module as a script (terminates option list)\n\ -O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x\n\ -OO : remove doc-strings in addition to the -O optimizations\n\ +-R : use a pseudo-random salt to make hash() values of various types be\n\ + unpredictable between separate invocations of the interpreter, as\n\ + a defense against denial-of-service attacks\n\ -Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew\n\ -s : don't add user site directory to sys.path; also PYTHONNOUSERSITE\n\ -S : don't imply 'import site' on initialization\n\ @@ -102,6 +105,12 @@ PYTHONHOME : alternate <prefix> directory (or <prefix>%c<exec_prefix>).\n\ PYTHONCASEOK : ignore case in 'import' statements (Windows).\n\ PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.\n\ "; +static char *usage_6 = "\ +PYTHONHASHSEED: if this variable is set to ``random``, the effect is the same \n\ + as specifying the :option:`-R` option: a random value is used to seed the\n\ + hashes of str, bytes and datetime objects. It can also be set to an integer\n\ + in the range [0,4294967295] to get hash values with a predictable seed.\n\ +"; static int @@ -118,6 +127,7 @@ usage(int exitcode, char* program) fputs(usage_3, f); fprintf(f, usage_4, DELIM); fprintf(f, usage_5, DELIM, PYTHONHOMEHELP); + fputs(usage_6, f); } #if defined(__VMS) if (exitcode == 0) { @@ -389,6 +399,10 @@ Py_Main(int argc, char **argv) PySys_AddWarnOption(_PyOS_optarg); break; + case 'R': + Py_HashRandomizationFlag++; + break; + /* This space reserved for other options */ default: |