diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index c349d76c5..c8dca78bf 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -939,7 +939,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
       <not-bool/>
@@ -950,11 +950,11 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
     </arg>
-    <arg nr="2">
+    <arg nr="2" direction="out">
       <not-null/>
       <not-bool/>
     </arg>
@@ -964,11 +964,11 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
     </arg>
-    <arg nr="2">
+    <arg nr="2" direction="out">
       <not-null/>
       <not-bool/>
     </arg>
@@ -978,10 +978,11 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
+      <not-null/>
       <not-uninit/>
     </arg>
-    <arg nr="2">
+    <arg nr="2" direction="out">
       <not-null/>
       <not-bool/>
     </arg>
@@ -991,7 +992,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
     </arg>
@@ -1019,7 +1020,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
     </arg>
@@ -1036,7 +1037,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
     </arg>
@@ -1070,7 +1071,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <returnValue type="clock_t"/>
     <leak-ignore/>
-    <arg nr="1">
+    <arg nr="1" direction="out">
       <not-uninit/>
       <not-bool/>
     </arg>
@@ -1080,11 +1081,11 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
     </arg>
-    <arg nr="2">
+    <arg nr="2" direction="in">
       <not-uninit/>
       <not-bool/>
     </arg>
@@ -1095,13 +1096,14 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <noreturn>false</noreturn>
     <leak-ignore/>
     <returnValue type="int"/>
-    <arg nr="1">
+    <arg nr="1" direction="in">
       <not-null/>
       <not-uninit/>
     </arg>
-    <arg nr="2">
+    <arg nr="2" direction="in">
       <not-uninit/>
       <not-bool/>
+      <minsize type="value" value="2"/>
     </arg>
   </function>
   <!-- DIR *opendir(const char *name); -->