notify: cleanups

* move set_nonblock{,ing}() into utils.c since we use it
elsewhere, too
* add proper error checking to set_nonblocking()
* use os_compat.h instead of individually #includ-ing system headers

git-svn-id: https://svn.musicpd.org/mpd/trunk@7217 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/utils.c

@@ -214,3 +214,18 @@ char *parsePath(char *path)
 
 	return newPath;
 }
+
+int set_nonblocking(int fd)
+{
+	int ret, flags;
+
+	assert(fd >= 0);
+
+	while ((flags = fcntl(fd, F_GETFL)) < 0 && errno == EINTR) ;
+	if (flags < 0)
+		return flags;
+
+	flags |= O_NONBLOCK;
+	while ((ret = fcntl(fd, F_SETFL, flags)) < 0 && errno == EINTR) ;
+	return ret;
+}