flush now ensures file data is fully written to disk

prof.c

@@ -97,6 +97,7 @@ _Static_assert(sizeof(long long) == 8, "incorrect size");
 #	include <winsock2.h>
 #	include <ws2tcpip.h>
 #	include <windows.h>
+#   include <io.h>
 #elif defined(UTRACY_LINUX)
 #	define _GNU_SOURCE
 #	include <errno.h>
@@ -1654,11 +1655,25 @@ char *UTRACY_WINDOWS_CDECL UTRACY_LINUX_CDECL flush(int argc, char **argv) {
 		return "file stream closed";
 	}
 
-	if(fflush(utracy.fstream) != 0) {
+	// Then ensure it's written to disk
+	int fd = _fileno(utracy.fstream);
+	if(fd == -1) {
 		LOG_DEBUG_ERROR;
-		return "failed to flush file stream";
+		return "failed to get file descriptor";
 	}
 
+#if defined(UTRACY_WINDOWS)
+	if(_commit(fd) != 0) {
+		LOG_DEBUG_ERROR;
+		return "failed to commit file to disk";
+	}
+#elif defined(UTRACY_LINUX)
+	if(fsync(fd) != 0) {
+		LOG_DEBUG_ERROR;
+		return "failed to sync file to disk";
+	}
+#endif
+
 	return "0";
 }