结构体位(bit)操作

#include
#include

typedef struct ngx_buf_s ngx_buf_t;

struct ngx_buf_s
{
    char name[32];
    unsigned memory:1;
    unsigned mmap:1;
    unsigned flush:1;
};

int main(int argc, char **argv)
{
    ngx_buf_t buf;
    memset(&buf, 0, sizeof(ngx_buf_t));
    strcpy(buf.name, "hello world!");

    buf.memory = 1;
    buf.mmap = 0;
    buf.flush = 1;

    printf("buf.name[%s]\n", buf.name);
    printf("buf.memory[%d]\n", buf.memory);
    printf("buf.mmap[%d]\n", buf.mmap);
    printf("buf.flush[%d]\n", buf.flush);

    return 0;
}


输出结果：
[fpf@localhost test]$ ./a.out
buf.name[hello world!]
buf.memory[1]
buf.mmap[0]
buf.flush[1]