fuzzer support for FreeBSD, getting opcache location

Closes GH-7926.

sapi/fuzzer/fuzzer-execute-common.h

@@ -16,6 +16,10 @@
 
 #include <main/php.h>
 
+#if defined(__FreeBSD__)
+# include <sys/sysctl.h>
+#endif
+
 #include "fuzzer.h"
 #include "fuzzer-sapi.h"
 #include "zend_exceptions.h"
@@ -140,7 +144,13 @@ ZEND_ATTRIBUTE_UNUSED char *get_opcache_path(void) {
 
 	/* Try relative to binary location. */
 	char path[MAXPATHLEN];
+#if defined(__FreeBSD__)
+	size_t pathlen = sizeof(path);
+	int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
+	if (sysctl(mib, 4, path, &pathlen, NULL, 0) < 0) {
+#else
 	if (readlink("/proc/self/exe", path, sizeof(path)) < 0) {
+#endif
 		ZEND_ASSERT(0 && "Failed to get binary path");
 		return NULL;
 	}