fd_proc.c 文件参考

浏览源代码.

函数
static void	FillFdInfo (struct SeqBuf *seqBuf, struct filelist *fileList, unsigned int pid, bool hasPrivilege)
static int	FdProcFill (struct SeqBuf *seqBuf, void *v)
void	ProcFdInit (void)

变量
static const struct ProcFileOperations	FD_PROC_FOPS

函数说明

FdProcFill()

static int FdProcFill ( struct SeqBuf *  seqBuf, void *  v  )

static

在文件 fd_proc.c 第 92 行定义.

{
    int pidNum;
    bool hasPrivilege;
    unsigned int pidMaxNum;
    unsigned int *pidList = NULL;
 
    /* privilege user */
    if (IsCapPermit(CAP_DAC_READ_SEARCH)) {
        pidMaxNum = LOS_GetSystemProcessMaximum();
        pidList = (unsigned int *)malloc(pidMaxNum * sizeof(unsigned int));
        if (pidList == NULL) {
            return -ENOMEM;
        }
        pidNum = LOS_GetUsedPIDList(pidList, pidMaxNum);
        hasPrivilege = true;
        (void)LosBufPrintf(seqBuf, "%s\t%s\t%6s %s\t%s\n", "Pid", "Fd", "SysFd", "<ref>", "Name");
    } else {
        pidNum = 1;
        pidList = (unsigned int *)malloc(pidNum * sizeof(unsigned int));
        if (pidList == NULL) {
            return -ENOMEM;
        }
        pidList[0] = LOS_GetCurrProcessID();
        hasPrivilege = false;
        (void)LosBufPrintf(seqBuf, "Pid\tFd\tName\n");
    }
 
    struct filelist *fileList = &tg_filelist;
    (void)sem_wait(&fileList->fl_sem);
 
    for (int i = 0; i < pidNum; i++) {
        FillFdInfo(seqBuf, fileList, pidList[i], hasPrivilege);
    }
 
    free(pidList);
    (void)sem_post(&fileList->fl_sem);
    return 0;
}

函数调用图:

FillFdInfo()

static void FillFdInfo ( struct SeqBuf *  seqBuf, struct filelist *  fileList, unsigned int  pid, bool  hasPrivilege  )

static

在文件 fd_proc.c 第 49 行定义.

{
    int fd;
    int sysFd;
    char *name = NULL;
    struct file *filp = NULL;
 
    struct fd_table_s *fdt = LOS_GetFdTable(pid);
    if ((fdt == NULL) || (fdt->proc_fds == NULL)) {
        return;
    }
 
    (void)sem_wait(&fdt->ft_sem);
 
    for (fd = MIN_START_FD; fd < fdt->max_fds; fd++) {
        if (FD_ISSET(fd, fdt->proc_fds)) {
            sysFd = fdt->ft_fds[fd].sysFd;
            if (sysFd < CONFIG_NFILE_DESCRIPTORS) {
                filp = &fileList->fl_files[sysFd];
                name = filp->f_path;
            } else if (sysFd < (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS)) {
                name = "(socks)";
            } else if (sysFd < (FD_SETSIZE + CONFIG_NTIME_DESCRIPTORS)) {
                name = "(timer)";
            } else if (sysFd < (MQUEUE_FD_OFFSET + CONFIG_NQUEUE_DESCRIPTORS)) {
                name = "(mqueue)";
            } else if (sysFd < (EPOLL_FD_OFFSET + CONFIG_EPOLL_DESCRIPTORS)) {
                name = "(epoll)";
            } else {
                name = "(unknown)";
            }
 
            if (hasPrivilege) {
                (void)LosBufPrintf(seqBuf, "%u\t%d\t%6d <%d>\t%s\n", pid, fd, sysFd, filp ? filp->f_refcount : 1, name);
            } else {
                (void)LosBufPrintf(seqBuf, "%u\t%d\t%s\n", pid, fd, name);
            }
        }
    }
 
    (void)sem_post(&fdt->ft_sem);
}

函数调用图:

这是这个函数的调用关系图:

ProcFdInit()

void ProcFdInit

(

void

)

在文件 fd_proc.c 第 136 行定义.

{
    struct ProcDirEntry *pde = CreateProcEntry("fd", 0, NULL);
    if (pde == NULL) {
        PRINT_ERR("creat /proc/fd error.\n");
        return;
    }
 
    pde->procFileOps = &FD_PROC_FOPS;
}

函数调用图:

这是这个函数的调用关系图:

变量说明

FD_PROC_FOPS

const struct ProcFileOperations FD_PROC_FOPS

static

初始值:

= {
    .read       = FdProcFill,
}

在文件 fd_proc.c 第 132 行定义.