CODEWITHSUNDEEP
clinuxgcc
Germano Massullo
Germano Massullo

Reputation: 2642

list.h syntax errors that appear only when I use the code in a my C project

I am trying to develop some extra functionalities of https://github.com/ffnord/alfred/blob/master/vis/vis.c Since that I am not familiar with Linux lists (list.h), I tried to follow this list.h tutorial. To do that I created a very simple test.c file and I imported also the mentioned list.h file of batman/alfred (by openmesh).

Alfred/batman Github code compiles flawlessly, but in the example code GCC complains about list.h.

Description Resource    Path    Location    Type
expected ‘;’ before ‘}’ token   list.h  /C_Linux_kernel_lists/src   line 68 C/C++ Problem



Description Resource    Path    Location    Type
lvalue required as unary ‘&’ operand    list.h  /C_Linux_kernel_lists/src   line 68 C/C++ Problem

So my question is: why GCC does not complain with upstream list.h code and it returns me those messages when I try to use the same code?

Attached source code:

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "list.h"

struct Person
{
    char name[30];
    unsigned int weight;
    unsigned char gender;
    struct list_head list;
};

int main()
{
    struct Person personList;
    LIST_HEAD_INIT(&personList.list);

    struct Person* aNewPersonPointer;

    aNewPersonPointer = malloc(sizeof(*aNewPersonPointer));
    strcpt(aNewPersonPointer->name, "roman10");
    aNewPersonPointer->weight = 130;
    aNewPersonPointer->gender = 1;
    INIT_LIST_HEAD(&aNewPersonPointer->list);


    list_add(&aNewPersonPointer->list, &personList.list);

    return 0;


}

Upvotes: 4

Views: 286

Answers (1)

Schwern
Schwern

Reputation: 165175

I believe you should be calling INIT_LIST_HEAD and not LIST_HEAD_INIT. This is just a guess based on how the rest of the alfred code uses the list interface, LIST_HEAD_INIT is never used outside of list.h, but INIT_LIST_HEAD is in main.c, recv.c and vis/vis.c.

This is pointed out in a comment on that tutorial.

Upvotes: 2

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