update socket server fork program, add convert lowercase to uppercase support

Guo Wenxue

2018-11-16 6c41fb183d2ea71bb8d3a7bf4947f28eacfe97fe

 ch1_fileIO/syserr.c

@@ -1,6 +1,7 @@

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>