Re: Question about "fd" token

From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Mon May 18 2009 - 10:05:58 PDT

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    The structures you mention are defined in include/
    (which is used to generate the file blcr_common.h).
    You say you don't ask a question until you cannot find the answer
    another way. However, this question and some of others you have asked
    could have been answered with the right tools. I don't wish to
    discourage you from answering questions when you need help, but if I can
    teach you how to find answers for yourself, that is more valuable than
    an answer alone.
    Are you familiar with the "grep" command? Grep could have found all
    instances of the string "struct cr_chkpt_args" as follows:
    $ grep -R 'struct cr_chkpt_args' .
    ./cr_module/cr_chkpt_req.c:int do_chkpt_req(struct file *filp, struct
    cr_chkpt_args *ureq)
    ./cr_module/cr_chkpt_req.c:int cr_chkpt_req(struct file *filp, struct
    cr_chkpt_args __user *arg)
    ./cr_module/cr_chkpt_req.c: struct cr_chkpt_args ureq;
    ./cr_module/cr_chkpt_req.c: struct cr_chkpt_args ureq;
    ./cr_module/cr_fops.c: return cr_chkpt_req(file, (struct cr_chkpt_args
    __user *)arg);
    ./cr_module/cr_module.h:extern int cr_chkpt_req(struct file *filp,
    struct cr_chkpt_args __user *arg);
    ./include/ cr_chkpt_args {
    ./include/blcr_ioctl.h:// CR_OP_CHKPT_REQ(struct cr_chkpt_args *args)
    ./libcr/cr_request.c: struct cr_chkpt_args req;
    It should be clear that only the line in looks like a
    definition of the structure.
    李宏亮 wrote:
    > Hello, Professor:
    > Thank you very much for your help, I have understand what you have
    > told me.
    > I am not the person who asks questions as soon as they meet with a
    > problem, It's only when I can not work it out and can not find answer
    > through other ways will I resort to you . please excuse me..
    > I know we can pass some arguments when we are calling ioctl
    > syscall.For example:
    > #define CR_OP_HAND_CHKPT_INFO _IOR (CR_IOCTL_BASE, 0x0a, struct
    > cr_chkpt_info *)
    > #define CR_OP_CHKPT_REQ _IOW (CR_IOCTL_BASE, 0x10, struct cr_chkpt_args *)
    > #define CR_OP_CHKPT_FWD _IOW (CR_IOCTL_BASE, 0x13, struct cr_fwd_args *)
    > when issue a ioctl syscall, struct"cr_chkpt_info" "cr_chkpt_args"
    > "cr_fwd_args" are passed.
    > "struct cr_chkpt_args req;"
    > "rc = cri_syscall_token(token, CR_OP_CHKPT_REQ, (uintptr_t)&req)"
    > However, I can not find the definition of these structure...
    > Are they allocated dynamically? I have never seen such a usage...
    > Is that because the arguments are from user space??? or some other
    > reasons???
    > ===============================================
    > 快来和我一起享受TOM免费邮箱吧!看看除了1.5G,还有什么?
    > <>
    > ===============================================
    Paul H. Hargrove                          PHHargrove_at_lbl_dot_gov
    Future Technologies Group                 Tel: +1-510-495-2352
    HPC Research Department                   Fax: +1-510-486-6900
    Lawrence Berkeley National Laboratory     

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