Update usage messages

4 files changed, 13 insertions, 7 deletions

diff --git a/afl-cmin b/afl-cmin
index a9806892..15b61f89 100755
--- a/afl-cmin
+++ b/afl-cmin
@@ -123,8 +123,9 @@ function usage() {
 "AFL_FORKSRV_INIT_TMOUT: time the fuzzer waits for the forkserver to come up\n" \
 "AFL_KEEP_TRACES: leave the temporary <out_dir>/.traces directory\n" \
 "AFL_KILL_SIGNAL: Signal delivered to child processes on timeout (default: SIGKILL)\n" \
-"AFL_FORK_SERVER_KILL_SIGNAL: Signal delivered to fork server processes on termination\n"
-"                             (default: SIGTERM)\n"
+"AFL_FORK_SERVER_KILL_SIGNAL: Signal delivered to fork server processes on termination\n" \
+"                             (default: SIGTERM). If this is not set and AFL_KILL_SIGNAL is set,\n" \
+"                             this will be set to the same value as AFL_KILL_SIGNAL.\n" \
 "AFL_NO_FORKSRV: run target via execve instead of using the forkserver\n" \
 "AFL_CMIN_ALLOW_ANY: write tuples for crashing inputs also\n" \
 "AFL_PATH: path for the afl-showmap binary if not found anywhere in PATH\n" \
diff --git a/src/afl-fuzz.c b/src/afl-fuzz.c
index 7e4e20a0..d8d804ae 100644
--- a/src/afl-fuzz.c
+++ b/src/afl-fuzz.c
@@ -262,6 +262,9 @@ static void usage(u8 *argv0, int more_help) {
       "AFL_INPUT_LEN_MIN/AFL_INPUT_LEN_MAX: like -g/-G set min/max fuzz length produced\n"
       "AFL_PIZZA_MODE: 1 - enforce pizza mode, 0 - disable for April 1st\n"
       "AFL_KILL_SIGNAL: Signal ID delivered to child processes on timeout, etc. (default: SIGKILL)\n"
+      "AFL_FORK_SERVER_KILL_SIGNAL: Signal delivered to fork server processes on termination\n"
+      "                             (default: SIGTERM). If this is not set and AFL_KILL_SIGNAL is set,\n"
+      "                             this will be set to the same value.\n"
       "AFL_MAP_SIZE: the shared memory size for that target. must be >= the size\n"
       "              the target was compiled for\n"
       "AFL_MAX_DET_EXTRAS: if more entries are in the dictionary list than this value\n"
diff --git a/src/afl-showmap.c b/src/afl-showmap.c
index 19288c04..31091e8e 100644
--- a/src/afl-showmap.c
+++ b/src/afl-showmap.c
@@ -864,10 +864,11 @@ static void usage(u8 *argv0) {
       "AFL_DEBUG: enable extra developer output\n"
       "AFL_FORKSRV_INIT_TMOUT: time spent waiting for forkserver during "
       "startup (in milliseconds)\n"
-      "AFL_KILL_SIGNAL: Signal ID delivered to child processes on timeout, "
-      "etc. (default: SIGKILL)\n"
-      "AFL_FORK_SERVER_KILL_SIGNAL: Signal delivered to fork server processes on termination"
-      "                             (default: SIGTERM)\n"
+      "AFL_KILL_SIGNAL: Signal ID delivered to child processes on timeout,\n"
+      "                 etc. (default: SIGKILL)\n"
+      "AFL_FORK_SERVER_KILL_SIGNAL: Signal delivered to fork server processes on termination\n"
+      "                             (default: SIGTERM). If this is not set and AFL_KILL_SIGNAL is set,\n"
+      "                             this will be set to the same value as AFL_KILL_SIGNAL.\n"
       "AFL_MAP_SIZE: the shared memory size for that target. must be >= the "
       "size the target was compiled for\n"
       "AFL_PRELOAD: LD_PRELOAD / DYLD_INSERT_LIBRARIES settings for target\n"
diff --git a/src/afl-tmin.c b/src/afl-tmin.c
index 43636b6f..b346f65c 100644
--- a/src/afl-tmin.c
+++ b/src/afl-tmin.c
@@ -882,7 +882,8 @@ static void usage(u8 *argv0) {
       "AFL_FORKSRV_INIT_TMOUT: time spent waiting for forkserver during startup (in milliseconds)\n"
       "AFL_KILL_SIGNAL: Signal ID delivered to child processes on timeout, etc. (default: SIGKILL)\n"
       "AFL_FORK_SERVER_KILL_SIGNAL: Signal delivered to fork server processes on termination\n"
-      "                             (default: SIGTERM)\n"
+      "                             (default: SIGTERM). If this is not set and AFL_KILL_SIGNAL is set,\n"
+      "                             this will be set to the same value as AFL_KILL_SIGNAL.\n"
       "AFL_MAP_SIZE: the shared memory size for that target. must be >= the size\n"
       "              the target was compiled for\n"
       "AFL_PRELOAD:  LD_PRELOAD / DYLD_INSERT_LIBRARIES settings for target\n"