p4-7.c

UNIX程序设计教程

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "err_exit.h"
int main(void)
{
    if (creat("aha", S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|
                                      S_IROTH|S_IWOTH) < 0)
        err_exit("creat error for aha");
    umask(0); 
    if (creat("bar", S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|
                                      S_IROTH|S_IWOTH) < 0)
        err_exit("creat error for bar");
    umask(S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 
    if (creat("foo", S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|
                                      S_IROTH|S_IWOTH) < 0)
        err_exit("creat error for foo");
    exit(0);  
}