Merge pull request #80 from hi-rajat-kumar/master

build-fix: conditionally compile `epoll_pwait2()` only when your comp…

Author: hi-rajat-kumar

README.md

@@ -422,6 +422,14 @@ be insignificant.  However, the keys are case sensitive.
     throughput_units
     throughput
 
+## Compile Neper
+
+To compile `neper`, run `make` or `make all` on your CLI. This will create all the eight binaries, `tcp_rr`, `tcp_stream`, `tcp_crr`, `udp_rr`, `udp_stream`, `psp_stream`, `psp_crr` and `psp_rr` for you.
+
+You can enable the use of `epoll_pwait2()` by passing defination `-DHAVE_EPOLL_PWAIT2` under `CFLAGS` of `Makefile`. Before enabling it make sure that your libc has `epoll_pwait2()` support.
+
+To build a docker image, run `make image` from your CLI.
+
 ## Running in Kubernetes
 
 When running `neper` in Kubernetes for network performance testing, it is important to ensure that the client and server pods are running on different nodes. This provides a more realistic network path and avoids the test being skewed by the node's internal loopback traffic.

thread.c

@@ -359,7 +359,7 @@ int neper_epoll_wait(int epfd, struct epoll_event *events, int maxevents,
         return epoll_wait(epfd, events, maxevents, ms);
 }
 
-#ifdef __NR_epoll_pwait2
+#ifdef HAVE_EPOLL_PWAIT2
 int neper_epoll_pwait2(int epfd, struct epoll_event *events, int maxevents,
                         struct timespec *timeout)
 {
@@ -401,7 +401,7 @@ void start_worker_threads(struct options *opts, struct callbacks *cb,
          */
         int64_t rounding_ns = 500000;
         poll_wait poll_func = neper_epoll_wait;
-#ifdef __NR_epoll_pwait2
+#ifdef HAVE_EPOLL_PWAIT2
         struct epoll_event events;
         epoll_pwait2(-1, &events, 0, NULL, NULL); /* Sets EINVAL or ENOSYS. */
         if (errno != ENOSYS) {