umask函数

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

int main(int argc, char * * argv)
{
    printf("sizeof(int)=[%d]\n", sizeof(int));
    printf("sizeof(long)=[%d]\n", sizeof(long));

    mode_t value;

    value = umask(0);
    remove("umask.txt");
    int fd = open("umask.txt", O_RDWR|O_CREAT|O_TRUNC, 0755);

    printf("八进制=[%o]\n", value);

    mode_t value2;

    return 0;
}