diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index acd015ea3..906ecc1bb 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -1,5 +1,15 @@
 <?xml version="1.0"?>
 <def format="1">
+  <!-- unsigned int sleep(unsigned int seconds); -->
+  <function name="sleep">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-uninit/>
+      <not-bool/>
+      <valid>0:</valid>
+    </arg>
+    <leak-ignore/>
+  </function>
   <!-- int usleep(useconds_t useconds); -->
   <function name="usleep">
     <noreturn>false</noreturn>
@@ -43,6 +53,30 @@
     </arg>
     <leak-ignore/>
   </function>
+  <!-- struct hostent *gethostbyname(const char *name); -->
+  <function name="gethostbyname">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+    <leak-ignore/>
+  </function>
+  <!-- struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type); -->
+  <function name="gethostbyaddr">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+    <arg nr="3">
+      <not-uninit/>
+    </arg>
+    <leak-ignore/>
+  </function>
   <!-- int brk(void *addr); -->
   <function name="brk">
     <noreturn>false</noreturn>
@@ -709,6 +743,17 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- int fcntl(int fd, int cmd, ... /* arg */ ); -->
+  <function name="fcntl">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- void syslog(int priority, const char *format, ...); -->
   <function name="syslog">
     <noreturn>false</noreturn>
@@ -958,6 +1003,7 @@
   <podtype name="intptr_t"/>
   <podtype name="timespec"/>
   <podtype name="timeval"/>
+  <podtype name="sigaction"/>
   <!-- http://pubs.opengroup.org/onlinepubs/009695399/basedefs/arpa/inet.h.html -->
   <!-- uint32_t htonl(uint32_t); -->
   <function name="htonl">
@@ -1689,6 +1735,26 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- int killpg(int pgrp, int sig); -->
+  <function name="killpg">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+  </function>
+  <!-- int kill(pid_t pid, int sig); -->
+  <function name="kill">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- int clock_gettime(clockid_t clock_id, struct timespec *tp); -->
   <function name="clock_gettime">
     <noreturn>false</noreturn>