CODEWITHSUNDEEP
cgostructcgo
dimlee
dimlee

Reputation: 462

Why doesn't CGo recognize my struct declared in a header file?

I am getting the error "./test.h:10:3: error: unknown type name 'PROCESS'" when I include my header file test.h that has the struct definition PROCESS as a part of my C Go Lang application. The code compiles in C with no problems so I imagine I'm doing something very simple incorrectly...

package main

// #include <sys/mman.h>
// #include <errno.h>
// #include <inttypes.h>
// #include <stdlib.h>
// #include "test.h"
import "C"

import (
    "fmt"
    _"unsafe"
  )


func main() {
    fmt.Println("Retrieving process list");

}

The contents of test.h are below...

#include <sys/mman.h>
#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>

struct PROCESS {
    char *name;
    int os_type;
    addr_t address;
    PROCESS *next;

    //fields we care about
    unsigned int uid;
    unsigned int gid;
    unsigned int is_root;
    unsigned int io_r;
    unsigned int io_wr;
    unsigned int io_sys_r;
    unsigned int io_sys_wr;
    unsigned int used_super;
    unsigned int is_k_thread;
    unsigned int cpus;
    unsigned long hw_rss;
    unsigned long vma_size;
    unsigned long map_count;
    unsigned long pages;
    unsigned long total_map;
    unsigned long min_flt;
    unsigned long mm_usrs;
    unsigned long nr_ptes;
    unsigned long nvcsw;

};

Upvotes: 0

Views: 954

Answers (1)

Clifford
Clifford

Reputation: 93476

In C, (unlike C++), the struct keyword does not declare a type-name that can be used on its own; it needs qualification with the struct keyword. The type is struct PROCESS not PROCESS:

struct PROCESS 
{
    char* name ;
    int os_type ;
    addr_t address ;
    struct PROCESS* next ;   // The struct keyword is needed here
    ...

Upvotes: 4

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