Struct with union: structure has no member named

Question

I have the following structures:

struct sched_param {
    union {
        int sched_priority;
        struct lshort_sched_param lshort_params;
    };
};

struct lshort_sched_param {
    int requested_time;
    int level;
};

Whenever I make a sched_param param1 structure and try to update the param1.sched_priority field I get the message written in the topic.

struct sched_param param1;
param1.sched_priority = 1;

But, whenever I make a sched_param param2 and try to update the param2.lshort_params.level it works good.

struct sched_param param2;
param2.lshort_params.level= 1;

What could be the reason?

you need to give the union an identifier, so it can be referred to. — user3629249, Dec 01 '14 at 22:39
This is a struct given to us in an homework assignment, so I cant give a name to the union. Is there any other solution ? — Nadav Peled, Dec 01 '14 at 22:54

score 3 · Answer 1 · edited May 23 '17 at 12:10

3

It is because the version of the gcc compiler you are using does not support unnamed union. See this stackoverflow link

edited May 23 '17 at 12:10

Community

1
1

answered Dec 01 '14 at 22:31

helloV

50,176
7
137
145

score 3 · Answer 2 · answered Dec 01 '14 at 22:33

3

Your union should have a name, for instance

struct sched_param {
    union {
        int sched_priority;
        struct lshort_sched_param lshort_params;
    } union_member_name;
};

and then you can use param1.union_member_name.sched_priority

answered Dec 01 '14 at 22:33

Iharob Al Asimi

52,653
6
59
97

This is a struct given to us in an homework assignment, so I cant give a name to the union. Is there any other solution ? – Nadav Peled Dec 01 '14 at 22:54
@helloV already gave you a solution. – Iharob Al Asimi Dec 01 '14 at 23:25

Struct with union: structure has no member named

2 Answers2