5 files changed, 37 insertions, 32 deletions
diff --git a/src/afl-fuzz-cmplog.c b/src/afl-fuzz-cmplog.c
index 4be6a2c8..faf4dcb7 100644
--- a/src/afl-fuzz-cmplog.c
+++ b/src/afl-fuzz-cmplog.c
@@ -51,7 +51,6 @@ u8 common_fuzz_cmplog_stuff(afl_state_t *afl, u8 *out_buf, u32 len) {
 
   u8 fault;
 
-
   write_to_testcase(afl, out_buf, len);
 
   fault = fuzz_run_target(afl, &afl->cmplog_fsrv, afl->fsrv.exec_tmout);
diff --git a/src/afl-fuzz-init.c b/src/afl-fuzz-init.c
index aea22f48..d468f2c8 100644
--- a/src/afl-fuzz-init.c
+++ b/src/afl-fuzz-init.c
@@ -297,14 +297,24 @@ void setup_post(afl_state_t *afl) {
   dh = dlopen(fn, RTLD_NOW);
   if (!dh) { FATAL("%s", dlerror()); }
 
-  struct custom_mutator * mutator;
+  struct custom_mutator *mutator;
   mutator = ck_alloc(sizeof(struct custom_mutator));
   memset(mutator, 0, sizeof(struct custom_mutator));
 
   mutator->afl_custom_post_process = dlsym(dh, "afl_postprocess");
-  if (!mutator->afl_custom_post_process) { FATAL("Symbol 'afl_postprocess' not found."); }
+  if (!mutator->afl_custom_post_process) {
+
+    FATAL("Symbol 'afl_postprocess' not found.");
+
+  }
+
   mutator->afl_custom_init = dlsym(dh, "afl_postprocess_init");
-  if (!mutator->afl_custom_init) { FATAL("Symbol 'afl_postprocess_init' not found."); }
+  if (!mutator->afl_custom_init) {
+
+    FATAL("Symbol 'afl_postprocess_init' not found.");
+
+  }
+
   mutator->afl_custom_deinit = dlsym(dh, "afl_postprocess_deinit");
   if (!mutator->afl_custom_post_process) {
 
@@ -1373,6 +1383,17 @@ void setup_dirs_fds(afl_state_t *afl) {
 
   }
 
+/*
+  if (afl->is_master) {
+
+    u8 *x = alloc_printf("%s/is_master", afl->sync_dir);
+    int fd = open(x, O_CREAT | O_RDWR, 0644);
+    if (fd < 0) FATAL("cannot create %s", x);
+    close(fd);
+
+  }
+*/
+
   if (mkdir(afl->out_dir, 0700)) {
 
     if (errno != EEXIST) { PFATAL("Unable to create '%s'", afl->out_dir); }
@@ -1861,14 +1882,6 @@ void fix_up_sync(afl_state_t *afl) {
 
   if (afl->dumb_mode) { FATAL("-S / -M and -n are mutually exclusive"); }
 
-  if (afl->skip_deterministic) {
-
-    if (afl->force_deterministic) { FATAL("use -S instead of -M -d"); }
-    // else
-    //  FATAL("-S already implies -d");
-
-  }
-
   while (*x) {
 
     if (!isalnum(*x) && *x != '_' && *x != '-') {
@@ -1888,13 +1901,6 @@ void fix_up_sync(afl_state_t *afl) {
   afl->sync_dir = afl->out_dir;
   afl->out_dir = x;
 
-  if (!afl->force_deterministic) {
-
-    afl->skip_deterministic = 1;
-    afl->use_splicing = 1;
-
-  }
-
 }
 
 /* Handle screen resize (SIGWINCH). */
diff --git a/src/afl-fuzz-mutators.c b/src/afl-fuzz-mutators.c
index acc1b12d..87cb86fa 100644
--- a/src/afl-fuzz-mutators.c
+++ b/src/afl-fuzz-mutators.c
@@ -108,7 +108,8 @@ void setup_custom_mutators(afl_state_t *afl) {
 
 #endif
 
-  if (afl->post_library_mutator) list_append(&afl->custom_mutator_list, afl->post_library_mutator);
+  if (afl->post_library_mutator)
+    list_append(&afl->custom_mutator_list, afl->post_library_mutator);
 
 }
 
diff --git a/src/afl-fuzz-python.c b/src/afl-fuzz-python.c
index 2569cdaf..2044c97d 100644
--- a/src/afl-fuzz-python.c
+++ b/src/afl-fuzz-python.c
@@ -384,7 +384,8 @@ struct custom_mutator *load_custom_mutator_py(afl_state_t *afl,
 
 }
 
-size_t post_process_py(void *py_mutator, u8 *buf, size_t buf_size, u8 **out_buf) {
+size_t post_process_py(void *py_mutator, u8 *buf, size_t buf_size,
+                       u8 **out_buf) {
 
   size_t        py_out_buf_size;
   PyObject *    py_args, *py_value;
@@ -402,7 +403,8 @@ size_t post_process_py(void *py_mutator, u8 *buf, size_t buf_size, u8 **out_buf)
   PyTuple_SetItem(py_args, 0, py_value);
 
   py_value = PyObject_CallObject(
-      ((py_mutator_t *)py_mutator)->py_functions[PY_FUNC_POST_PROCESS], py_args);
+      ((py_mutator_t *)py_mutator)->py_functions[PY_FUNC_POST_PROCESS],
+      py_args);
 
   Py_DECREF(py_args);
 
@@ -412,7 +414,8 @@ size_t post_process_py(void *py_mutator, u8 *buf, size_t buf_size, u8 **out_buf)
 
     ck_maybe_grow(BUF_PARAMS(post_process), py_out_buf_size);
 
-    memcpy(py->post_process_buf, PyByteArray_AsString(py_value), py_out_buf_size);
+    memcpy(py->post_process_buf, PyByteArray_AsString(py_value),
+           py_out_buf_size);
     Py_DECREF(py_value);
 
     *out_buf = py->post_process_buf;
diff --git a/src/afl-fuzz.c b/src/afl-fuzz.c
index 8075f03d..979ebfa3 100644
--- a/src/afl-fuzz.c
+++ b/src/afl-fuzz.c
@@ -390,7 +390,7 @@ int main(int argc, char **argv_orig, char **envp) {
 
         }
 
-        afl->force_deterministic = 1;
+        afl->is_master = 1;
 
       }
 
@@ -400,6 +400,9 @@ int main(int argc, char **argv_orig, char **envp) {
 
         if (afl->sync_id) { FATAL("Multiple -S or -M options not supported"); }
         afl->sync_id = ck_strdup(optarg);
+        afl->is_slave = 1;
+        afl->skip_deterministic = 1;
+        afl->use_splicing = 1;
         break;
 
       case 'f':                                              /* target file */
@@ -500,12 +503,6 @@ int main(int argc, char **argv_orig, char **envp) {
 
       case 'd':                                       /* skip deterministic */
 
-        if (afl->skip_deterministic) {
-
-          FATAL("Multiple -d options not supported");
-
-        }
-
         afl->skip_deterministic = 1;
         afl->use_splicing = 1;
         break;
@@ -794,8 +791,7 @@ int main(int argc, char **argv_orig, char **envp) {
   OKF("afl-tmin fork server patch from github.com/nccgroup/TriforceAFL");
   OKF("MOpt Mutator from github.com/puppet-meteor/MOpt-AFL");
 
-  if (afl->sync_id && afl->force_deterministic &&
-      afl->afl_env.afl_custom_mutator_only) {
+  if (afl->sync_id && afl->is_master && afl->afl_env.afl_custom_mutator_only) {
 
     WARNF(
         "Using -M master with the AFL_CUSTOM_MUTATOR_ONLY mutator options will "