Added test to cover setsockopt for tcpkeepalive

tests/acceptance/ld_preloads/setsockopt_logger.c

@@ -0,0 +1,34 @@
+#define _GNU_SOURCE
+
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+
+typedef int (*real_setsockopt_t)(int sockfd, int level, int optname, const void *optval, socklen_t optlen);
+
+int real_setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen)
+{
+  return ((real_setsockopt_t)dlsym(RTLD_NEXT, "setsockopt"))(sockfd, level, optname, optval, optlen);
+}
+
+/*
+ * Noddy LD_PRELOAD wrapper to catch setsockopt calls, and log them to a file.
+ */
+
+int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen)
+{
+  FILE *fd;
+  char *fn;
+  int retval;
+  
+  retval = real_setsockopt(sockfd, level, optname, optval, optlen);
+  fn = getenv("OUTPUT_setsockopt_logger");
+  if ( fn != NULL && optval != NULL && optlen == 4) {
+    fd = fopen(fn,"a");
+    fprintf(fd,"setsockopt:%d:%d:%i:%d\n", level, optname, *(int *)optval, retval);
+    fclose(fd);
+  }
+
+  return retval;
+}