diff options
Diffstat (limited to 'Modules/main.c')
| -rw-r--r-- | Modules/main.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/Modules/main.c b/Modules/main.c index 5a985a5c16..ed84aa0286 100644 --- a/Modules/main.c +++ b/Modules/main.c @@ -46,7 +46,7 @@ static wchar_t **orig_argv; static int orig_argc; /* command line options */ -#define BASE_OPTS L"bBc:dEhiJm:OqsStuvVW:xX:?" +#define BASE_OPTS L"bBc:dEhiJm:OqRsStuvVW:xX:?" #define PROGRAM_OPTS BASE_OPTS @@ -72,6 +72,9 @@ static char *usage_2 = "\ -O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x\n\ -OO : remove doc-strings in addition to the -O optimizations\n\ -q : don't print version and copyright messages on interactive startup\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 defence against denial-of-service attacks\n\ -s : don't add user site directory to sys.path; also PYTHONNOUSERSITE\n\ -S : don't imply 'import site' on initialization\n\ "; @@ -99,8 +102,14 @@ static char *usage_5 = "PYTHONHOME : alternate <prefix> directory (or <prefix>%c<exec_prefix>).\n" " The default module search path uses %s.\n" "PYTHONCASEOK : ignore case in 'import' statements (Windows).\n" -"PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.\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 usage(int exitcode, wchar_t* program) @@ -116,6 +125,7 @@ usage(int exitcode, wchar_t* 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) { @@ -429,6 +439,10 @@ Py_Main(int argc, wchar_t **argv) Py_QuietFlag++; break; + case 'R': + Py_HashRandomizationFlag++; + break; + /* This space reserved for other options */ default: |