access 函数。

#include

#include

int main(int argc, char *argv[])

{

if (argc != 2)

err_quit("usage: ");

if (access(argv[1], R_OK) < 0)

err_ret("access error for %s", argv[1]);

else 

printf("read access OK\n");

if (open(argv[1], O_RDONLY) < 0)

err_ret("open error for %s", argv[1]);

else 

printf("open for read OK\n");

return 0;

}