mountpoint.c - ubase - suckless linux base utils
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       ---
       mountpoint.c (1668B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include <sys/stat.h>
            3 #include <sys/sysmacros.h>
            4 #include <sys/types.h>
            5 
            6 #include <mntent.h>
            7 #include <stdio.h>
            8 #include <stdlib.h>
            9 #include <string.h>
           10 #include <unistd.h>
           11 
           12 #include "util.h"
           13 
           14 static void
           15 usage(void)
           16 {
           17         eprintf("usage: %s [-dqx] target\n", argv0);
           18 }
           19 
           20 int
           21 main(int argc, char *argv[])
           22 {
           23         int dflag = 0, qflag = 0, xflag = 0;
           24         int ret = 0;
           25         struct mntent *me = NULL;
           26         FILE *fp;
           27         struct stat st1, st2;
           28 
           29         ARGBEGIN {
           30         case 'd':
           31                 dflag = 1;
           32                 break;
           33         case 'q':
           34                 qflag = 1;
           35                 break;
           36         case 'x':
           37                 xflag = 1;
           38                 break;
           39         default:
           40                 usage();
           41         } ARGEND;
           42 
           43         if (argc < 1)
           44                 usage();
           45 
           46         if (stat(argv[0], &st1) < 0) {
           47                 if (qflag)
           48                         return 1;
           49                 eprintf("stat %s:", argv[0]);
           50         }
           51 
           52         if (xflag) {
           53                 if (!S_ISBLK(st1.st_mode)) {
           54                         if (qflag)
           55                                 return 1;
           56                         eprintf("stat: %s: not a block device\n",
           57                                 argv[0]);
           58                 }
           59                 printf("%u:%u\n", major(st1.st_rdev),
           60                        minor(st1.st_rdev));
           61                 return 0;
           62         }
           63 
           64         if (!S_ISDIR(st1.st_mode)) {
           65                 if (qflag)
           66                         return 1;
           67                 eprintf("stat %s: not a directory\n", argv[0]);
           68         }
           69 
           70         if (dflag) {
           71                 printf("%u:%u\n", major(st1.st_dev),
           72                        minor(st1.st_dev));
           73                 return 0;
           74         }
           75 
           76         fp = setmntent("/proc/mounts", "r");
           77         if (!fp) {
           78                 if (qflag)
           79                         return 1;
           80                 eprintf("setmntent %s:", "/proc/mounts");
           81         }
           82         while ((me = getmntent(fp)) != NULL) {
           83                 if (stat(me->mnt_dir, &st2) < 0) {
           84                         if (qflag)
           85                                 return 1;
           86                         eprintf("stat %s:", me->mnt_dir);
           87                 }
           88                 if (st1.st_dev == st2.st_dev &&
           89                     st1.st_ino == st2.st_ino)
           90                         break;
           91         }
           92         endmntent(fp);
           93 
           94         if (me == NULL)
           95                 ret = 1;
           96 
           97         if (!qflag)
           98                 printf("%s %s a mountpoint\n", argv[0],
           99                        !ret ? "is" : "is not");
          100 
          101         return ret;
          102 }