libutil: remove unused Pid::{killSignal, setKillSignal}

Change-Id: Ic7cceef2d82a98cf8fe23260603b1262c097cad4

lix/libutil/processes.cc

@@ -13,6 +13,7 @@
 #include "sync.hh"
 
 #include <cerrno>
+#include <csignal>
 #include <cstdlib>
 #include <cstring>
 #include <fcntl.h>
@@ -41,8 +42,7 @@ Pid::Pid()
 {
 }
 
-
-Pid::Pid(Pid && other) : pid(other.pid), separatePG(other.separatePG), killSignal(other.killSignal)
+Pid::Pid(Pid && other) : pid(other.pid), separatePG(other.separatePG)
 {
     other.pid = -1;
 }
@@ -53,7 +53,6 @@ Pid & Pid::operator=(Pid && other)
     Pid tmp(std::move(other));
     std::swap(pid, tmp.pid);
     std::swap(separatePG, tmp.separatePG);
-    std::swap(killSignal, tmp.killSignal);
     return *this;
 }
 
@@ -73,7 +72,7 @@ int Pid::kill()
     /* Send the requested signal to the child.  If it has its own
        process group, send the signal to every process in the child
        process group (which hopefully includes *all* its children). */
-    if (::kill(separatePG ? -pid : pid, killSignal) != 0) {
+    if (::kill(separatePG ? -pid : pid, SIGKILL) != 0) {
         /* On BSDs, killing a process group will return EPERM if all
            processes in the group are zombies (or something like
            that). So try to detect and ignore that situation. */
@@ -109,13 +108,6 @@ void Pid::setSeparatePG(bool separatePG)
     this->separatePG = separatePG;
 }
 
-
-void Pid::setKillSignal(int signal)
-{
-    this->killSignal = signal;
-}
-
-
 pid_t Pid::release()
 {
     pid_t p = pid;

lix/libutil/processes.hh

@@ -12,7 +12,6 @@
 #include <sys/stat.h>
 #include <dirent.h>
 #include <unistd.h>
-#include <signal.h>
 
 #include <functional>
 #include <map>
@@ -27,7 +26,6 @@ class Pid
 {
     pid_t pid = -1;
     bool separatePG = false;
-    int killSignal = SIGKILL;
 public:
     Pid();
     explicit Pid(pid_t pid): pid(pid) {}
@@ -39,7 +37,6 @@ public:
     int wait();
 
     void setSeparatePG(bool separatePG);
-    void setKillSignal(int signal);
     pid_t release();
     pid_t get() const { return pid; }
 };