From: Timo Teräs <timo.teras@iki.fi>

Fix setre[gu]id handling for musl. The libc calls work per POSIX definition
and change the process values (including all threads). Remove the per-thread
hacks. This fixes a race condition that created thread calls first setreuid()
causing the setgroups() call in the main thread to fail with -EPERM.

diff -ru fprobe-ulog-1.1.orig/src/fprobe-ulog.c fprobe-ulog-1.1/src/fprobe-ulog.c
--- fprobe-ulog-1.1.orig/src/fprobe-ulog.c	2014-07-30 13:09:34.000000000 -0300
+++ fprobe-ulog-1.1/src/fprobe-ulog.c	2014-07-30 13:46:25.952717084 -0300
@@ -619,18 +619,6 @@
 	return p;
 }
 
-void setuser() {
-	/*
-	Workaround for clone()-based threads
-	Try to change EUID independently of main thread
-	*/
-	if (pw) {
-		setgroups(0, NULL);
-		setregid(pw->pw_gid, pw->pw_gid);
-		setreuid(pw->pw_uid, pw->pw_uid);
-	}
-}
-
 void *emit_thread()
 {
 	struct Flow *flow;
@@ -642,8 +630,6 @@
 	p = (void *) &emit_packet + netflow->HeaderSize;
 	timeout.tv_nsec = 0;
 
-	setuser();
-
 	for (;;) {
 		pthread_mutex_lock(&emit_mutex);
 		while (!flows_emit) {
@@ -730,8 +716,6 @@
 	char logbuf[256];
 #endif
 
-	setuser();
-
 	timeout.tv_nsec = 0;
 	pthread_mutex_lock(&unpending_mutex);
 
@@ -777,8 +761,6 @@
 	struct Time now;
 	struct timespec timeout;
 
-	setuser();
-
 	timeout.tv_nsec = 0;
 	pthread_mutex_lock(&scan_mutex);
 
@@ -872,8 +854,6 @@
 	char logbuf[256];
 #endif
 
-	setuser();
-
 	while (!killed) {
 		len = ipulog_read(ulog_handle, cap_buf, CAPTURE_SIZE, 1);
 		if (len <= 0) {