access函数实例

#include <stdio.h> //for printf

#include <stdlib.h> //for exit

#include <unistd.h> //for access

#include <fcntl.h> //for open


int main(int argc,char *argv[])
{
    if(argc != 2)
    {
        printf("usage:./a.out <pathname>");
        exit(1);    
    }
    if(access(argv[1],R_OK) < 0)
    {
        printf("access error for %s\n",argv[1]);
        exit(1);    
    }
    else
    {
        printf("read access OK\n");    
    }
    if(open(argv[1],O_RDONLY) < 0)
    {
        printf("open error for %s\n",argv[1]);
        exit(1);    
    }
    else
    {
        printf("open for reading OK\n");    
    }
    exit(0);
}