usr.bin/lsvfs/lsvfs.c

   1 /*
   2  * lsvfs - list loaded VFSes
   3  * Garrett A. Wollman, September 1994
   4  * This file is in the public domain.
   5  *
   6  * $FreeBSD: src/usr.bin/lsvfs/lsvfs.c,v 1.13.2.1 2001/07/30 09:59:16 dd Exp $
   7  */
   8
   9 #include <sys/param.h>
  10 #include <sys/mount.h>
  11
  12 #include <err.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15
  16 #define FMT     "%-32.32s 0x%08x %5d  %s\n"
  17 #define HDRFMT  "%-32.32s %10s %5.5s  %s\n"
  18 #define DASHES  "-------------------------------- "     \
  19                 "---------- -----  ---------------\n"
  20
  21 static struct flaglist {
  22         int             flag;
  23         const char      str[32]; /* must be longer than the longest one. */
  24 } fl[] = {
  25         { .flag = VFCF_STATIC, .str = "static", },
  26         { .flag = VFCF_NETWORK, .str = "network", },
  27         { .flag = VFCF_READONLY, .str = "read-only", },
  28         { .flag = VFCF_SYNTHETIC, .str = "synthetic", },
  29         { .flag = VFCF_LOOPBACK, .str = "loopback", },
  30         { .flag = VFCF_UNICODE, .str = "unicode", },
  31 };
  32
  33 static const char *fmt_flags(int);
  34
  35 int
  36 main(int argc, char **argv)
  37 {
  38         int rv = 0;
  39         struct vfsconf vfc;
  40         struct ovfsconf *ovfcp;
  41         argc--, argv++;
  42
  43         setvfsent(1);
  44
  45         printf(HDRFMT, "Filesystem", "Num", "Refs", "Flags");
  46         fputs(DASHES, stdout);
  47
  48         if (argc) {
  49                 for(; argc; argc--, argv++) {
  50                         if (getvfsbyname(*argv, &vfc) == 0) {
  51                                 printf(FMT, vfc.vfc_name, vfc.vfc_typenum,
  52                                     vfc.vfc_refcount,
  53                                     fmt_flags(vfc.vfc_flags));
  54                         } else {
  55                                 warnx("VFS %s unknown or not loaded", *argv);
  56                                 rv = 1;
  57                         }
  58                 }
  59         } else {
  60                 while ((ovfcp = getvfsent()) != NULL) {
  61                         if (getvfsbyname(ovfcp->vfc_name, &vfc) == 0) {
  62                                 printf(FMT, vfc.vfc_name, vfc.vfc_typenum,
  63                                     vfc.vfc_refcount,
  64                                     fmt_flags(vfc.vfc_flags));
  65                         } else {
  66                                 warnx("VFS %s unknown or not loaded", *argv);
  67                                 rv = 1;
  68                         }
  69                 }
  70         }
  71
  72         endvfsent();
  73         return rv;
  74 }
  75
  76 static const char *
  77 fmt_flags(int flags)
  78 {
  79         static char buf[sizeof(struct flaglist) * sizeof(fl)];
  80         size_t i;
  81
  82         buf[0] = '\0';
  83         for (i = 0; i < nitems(fl); i++)
  84                 if (flags & fl[i].flag) {
  85                         strlcat(buf, fl[i].str, sizeof(buf));
  86                         strlcat(buf, ", ", sizeof(buf));
  87                 }
  88         if (buf[0] != '\0')
  89                 buf[strlen(buf) - 2] = '\0';
  90         return (buf);
  91 }