swtpm: remove pidfile after process exits

Remove the pidfile once swtpm process exits.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

src/swtpm/cuse_tpm.c

@@ -1237,6 +1237,8 @@ cleanup:
     if (exit_prg) {
         logprintf(STDOUT_FILENO,
                   "CUSE TPM is shutting down.\n");
+        pidfile_remove();
+
         exit(0);
     }
 

src/swtpm/pidfile.c

@@ -94,3 +94,15 @@ int pidfile_write(pid_t pid)
 error:
     return -1;
 }
+
+/*
+ * pidfile_remove: Remove the pid file
+ *
+ */
+void pidfile_remove(void)
+{
+    if (!g_pidfile)
+        return;
+
+    unlink(g_pidfile);
+}

src/swtpm/pidfile.h

@@ -40,5 +40,6 @@
 
 int pidfile_set(const char *pidfile);
 int pidfile_write(pid_t pid);
+void pidfile_remove(void);
 
 #endif /* _SWTPM_PIDFILE_H_ */

src/swtpm/swtpm.c

@@ -322,6 +322,8 @@ int swtpm_main(int argc, char **argv, const char *prgname, const char *iface)
         TPMLIB_Terminate();
     }
 
+    pidfile_remove();
+
     close(notify_fd[0]);
     notify_fd[0] = -1;
     close(notify_fd[1]);

src/swtpm/swtpm_chardev.c

@@ -311,6 +311,8 @@ int swtpm_chardev_main(int argc, char **argv, const char *prgname, const char *i
         TPMLIB_Terminate();
     }
 
+    pidfile_remove();
+
     close(notify_fd[0]);
     notify_fd[0] = -1;
     close(notify_fd[1]);