lsof

#include <fcntl.h>
#include <iostream>  
#include <ctime>   
#include <sys/types.h>    
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>  
#include <stdio.h>
#include <time.h>
#include <stdio.h>
#include <sys/types.h>   
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <errno.h> 

int Lsof(char *strFileSubPath)
{
    DIR *dir, *fdir;
    struct dirent *dirent, *fdirent;
    char strTmpPath[256] = "\0";
    char strSubPath[256] = "\0";
    char strHold[256] = "\0";
    if(NULL == strFileSubPath)
    {
        printf("Lsof函数参数k为空");
        return -1;
    }

    dir = opendir("/proc");
    if(NULL == dir)
    {
        printf(0, "打开文件路径[%s]出错，错误信息[%s]", "/proc", strerror(errno));
        return -1;
    }

    while(NULL != (dirent = readdir(dir)))
    {
        if(0 == strcmp(".", dirent->d_name) || 0 == strcmp("..", dirent->d_name))
            continue;
        sprintf(strTmpPath, "/proc/%s/fd/", dirent->d_name);

        fdir = opendir(strTmpPath);
        if(NULL == fdir)
        {
            continue;
        }
        while(NULL != (fdirent = readdir(fdir)))
        {
            if(0 == strcmp(".", fdirent->d_name) || 0 == strcmp("..", fdirent->d_name))
                continue;

            sprintf(strSubPath, "%s/%s", strTmpPath, fdirent->d_name);

            memset(strHold, 0, 256);
            readlink(strSubPath, strHold, 256);
            printf("subpath:%s strhold:%s \n", strSubPath, strHold);

            if(0 == strcmp(strFileSubPath, strHold))
            {
                return 1;
            }
        }
        closedir(fdir);
    }
    closedir(dir);

    return 0;
}

int main()
{
    pid_t pid = fork();
    char filebuffer[100] = {"/home/jesson/cpp/test.txt"};
    if (pid == 0)
    {
#if 1
        int fd = open(filebuffer, O_RDWR);  
        if (fd < 0)
        {
            printf("open filed errno:%d\n", errno);
            return 0;
        }
#endif

        printf("open successed.\n");
        while (1)
        {
            usleep(100);
        }

    }
    else if (pid > 0)
    {
        usleep(100000);

        struct stat st;
        stat(filebuffer, &st);
        printf("st.nlink:%d\n", st.st_nlink);

        printf("start del\n");
        if (Lsof(filebuffer))
        {
            printf("has some body in use.\n");
        }

        int ret = unlink(filebuffer);   
        printf("ret:%d\n", ret);
        while (1)
            usleep(100000);
    }
    else 
        printf("errorll");

    return 0;
}