强制定义用于将 unsafe.Pointer() 转换为 C 结构的 Go 结构

Question

与 C 代码互操作时，我无法直接转换结构，我被迫在 Go 中定义一个等效的结构。来自 libproc.h 的 C 函数是

int proc_pidinfo(int pid, int flavor, uint64_t arg,  void *buffer, int buffersize)

flavor==PROC_PIDTASKINFO 的 C 结构是 proc_taskinfo，如 sys/proc_info.h 中定义（包含在 libproc.h 中）：

struct proc_taskinfo {
    uint64_t        pti_virtual_size;   /* virtual memory size (bytes) */
    uint64_t        pti_resident_size;  /* resident memory size (bytes) */
    uint64_t        pti_total_user;     /* total time */
    uint64_t        pti_total_system;
    uint64_t        pti_threads_user;   /* existing threads only */
    uint64_t        pti_threads_system;
    int32_t         pti_policy;     /* default policy for new threads */
    int32_t         pti_faults;     /* number of page faults */
    int32_t         pti_pageins;        /* number of actual pageins */
    int32_t         pti_cow_faults;     /* number of copy-on-write faults */
    int32_t         pti_messages_sent;  /* number of messages sent */
    int32_t         pti_messages_received;  /* number of messages received */
    int32_t         pti_syscalls_mach;  /* number of mach system calls */
    int32_t         pti_syscalls_unix;  /* number of unix system calls */
    int32_t         pti_csw;            /* number of context switches */
    int32_t         pti_threadnum;      /* number of threads in the task */
    int32_t         pti_numrunning;     /* number of running threads */
    int32_t         pti_priority;       /* task priority*/
};

即使 Go 代码确实有效，我也无法直接使用 C.proc_taskinfo。 Go 函数是 propertiesOf()：完整源代码 here。

如果我引用 C 结构，我得到了与我在中关于主题的类似错误报告：could not determine kind of name for C.proc_taskinfo，但这次我确定定义是使用 #include.

Answer 1

根据documentation

To access a struct, union, or enum type directly, prefix it with struct_, union_, or enum_, as in C.struct_stat.

使用C.struct_proc_taskinfo.

强制定义用于将 unsafe.Pointer() 转换为 C 结构的 Go 结构

Forced to define Go struct for casting an unsafe.Pointer() to a C struct

c

pointers

language-interoperability

go