Work around sem_unlink bug on FreeBSD when /tmp is using tmpfs

PR:		189353

security/yara/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	yara
 PORTVERSION=	3.7.0
+PORTREVISION=	1
 DISTVERSIONPREFIX=	v
 CATEGORIES=	security
 

security/yara/files/patch-threading.c

@@ -0,0 +1,37 @@
+# Work around FreeBSD bug #189353 when /tmp is using tmpfs(5)
+
+--- threading.c.orig	2017-11-10 11:21:21 UTC
++++ threading.c
+@@ -33,6 +33,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBI
+ #include <errno.h>
+ #endif
+ 
++#if defined(__FreeBSD__)
++#include <stdlib.h>
++#endif
++
+ #include "threading.h"
+ 
+ 
+@@ -88,6 +92,11 @@ int semaphore_init(
+   *semaphore = CreateSemaphore(NULL, value, 65535, NULL);
+   if (*semaphore == NULL)
+     return GetLastError();
++  #elif defined(__FreeBSD__)
++  *semaphore = malloc(sizeof(sem_t));
++  if (*semaphore == NULL)
++    return errno;
++  return sem_init(*semaphore, 0, value);
+   #else
+   // Mac OS X doesn't support unnamed semaphores via sem_init, that's why
+   // we use sem_open instead sem_init and immediately unlink the semaphore
+@@ -112,6 +121,9 @@ void semaphore_destroy(
+ {
+   #if defined(_WIN32) || defined(__CYGWIN__)
+   CloseHandle(*semaphore);
++  #elif defined(__FreeBSD__)
++  sem_close(*semaphore);
++  free(*semaphore);
+   #else
+   sem_close(*semaphore);
+   #endif