给定一个硬盘标识，umout掉所有相关挂载

  1 #include <fcntl.h>
  2  #include <string.h>
  3  #include <assert.h>
  4  #include <pthread.h>
  5  #include <unistd.h>
  6  #include <stdlib.h>
  7  #include <sys/stat.h>
  8  #include <sys/time.h>
  9  #include <errno.h>
 10  #include <stdio.h>
 11  #include <linux/reboot.h>
 12  #include <dirent.h>
 13  #include <sys/mount.h>
 14  
 15  //def for bool
 16  #ifndef bool //8bit
 17  #define bool unsigned char
 18  #endif
 19  #ifndef NULL
 20  #define NULL ((void*)0)
 21  #endif
 22  #ifndef false
 23  #define false 0
 24  #endif
 25  #ifndef true
 26  #define true 1
 27  #endif
 28  //end of def for bool
 29  
 30  /*
 31   * check file is exist!!
 32   */
 33  static bool file_exist(const char* path)
 34  {
 35  
 36      if(!path) return false;
 37      if(access(path,F_OK) == 0)
 38      {
 39          return true;//file exist
 40      }
 41      printf("[Info] file:%s is not exist!\n",path);
 42      return false ; //file is not exist
 43  
 44  }
 45  static int umount_disk_partition(const char* disk)
 46  {
 47      if(!disk)
 48          return 0;
 49      
 50  #define MOUNTS_FILE_SIZE  2048
 51      const char* mounts = "/proc/self/mounts";
 52      const char* delims = " ";
 53  
 54      bool bug = true;
 55      char buf[MOUNTS_FILE_SIZE] = {0};
 56      int fd,ret = 0;
 57      int row = 0;
 58      char *start = NULL,*end = NULL,*lineend = NULL,*cp = NULL,*result = NULL;
 59 
 60      if((fd = open(mounts,O_RDONLY)) < 0)
 61      {
 62          perror("open error:");
 63          return -1;
 64      }
 65      if(lseek(fd,0,SEEK_SET) == (off_t)-1)
 66      {
 67          printf("lseek: %s (%d)\n", strerror(errno), errno);
 68          close(fd);
 69          return -1;
 70      }
 71      if((ret = read(fd,buf,sizeof(buf)-1)) < 0 )
 72      {
 73          perror("read error:");
 74          close(fd);
 75          return -1;
 76      }
 77      close(fd);
 78      end = buf + ret;
 79      *end = 0;
 80      start = buf;
 81      while(start < end)
 82      {
 83          lineend = strchr(start,'\0');
 84          if(!lineend)
 85              break;
 86          *lineend = 0;
 87          
 88          cp = strstr(start,disk);
 89          if(!cp) 
 90          {
 91              start = lineend + 1;
 92              continue;
 93          }
 94          
 95          result = strtok(cp,delims);
 96          row = 0;
 97          while(result)
 98          {
 99              if(row == 1)
100              {
101                  bug && printf("mount points:%s \n",result);
102                  umount2(result,MNT_FORCE);
103                  break;
104              }
105              row++;
106              result = strtok(NULL,delims);
107          }
108          start = cp + 1;
109      }
110      
111      
112      return 0;
113  }
114  main()
115  {
116      umount_disk_partition("/dev/mtdblock");
117  }