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mountlist.h File Reference
#include <stdbool.h>
#include <sys/types.h>
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Classes

struct  mount_entry

Functions

struct mount_entryread_file_system_list (bool need_fs_type)

Class Documentation

struct mount_entry

Definition at line 26 of file mountlist.h.

Collaboration diagram for mount_entry:
Class Members
dev_t me_dev
char * me_devname
unsigned int me_dummy: 1
char * me_mountdir
struct mount_entry * me_next
unsigned int me_remote: 1
char * me_type
unsigned int me_type_malloced: 1

Function Documentation

struct mount_entry* read_file_system_list ( bool  need_fs_type) [read]

Definition at line 337 of file mountlist.c.

{
  struct mount_entry *mount_list;
  struct mount_entry *me;
  struct mount_entry **mtail = &mount_list;
  (void) need_fs_type;

#ifdef MOUNTED_LISTMNTENT
  {
    struct tabmntent *mntlist, *p;
    struct mntent *mnt;
    struct mount_entry *me;

    /* the third and fourth arguments could be used to filter mounts,
       but Crays doesn't seem to have any mounts that we want to
       remove. Specifically, automount create normal NFS mounts.
       */

    if (listmntent (&mntlist, KMTAB, NULL, NULL) < 0)
      return NULL;
    for (p = mntlist; p; p = p->next) {
      mnt = p->ment;
      me = xmalloc (sizeof *me);
      me->me_devname = xstrdup (mnt->mnt_fsname);
      me->me_mountdir = xstrdup (mnt->mnt_dir);
      me->me_type = xstrdup (mnt->mnt_type);
      me->me_type_malloced = 1;
      me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
      me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
      me->me_dev = -1;
      *mtail = me;
      mtail = &me->me_next;
    }
    freemntlist (mntlist);
  }
#endif

#ifdef MOUNTED_GETMNTENT1 /* GNU/Linux, 4.3BSD, SunOS, HP-UX, Dynix, Irix.  */
  {
    struct mntent *mnt;
    char const *table = MOUNTED;
    FILE *fp;

    fp = setmntent (table, "r");
    if (fp == NULL)
      return NULL;

    while ((mnt = getmntent (fp)))
      {
        me = xmalloc (sizeof *me);
        me->me_devname = xstrdup (mnt->mnt_fsname);
        me->me_mountdir = xstrdup (mnt->mnt_dir);
        me->me_type = xstrdup (mnt->mnt_type);
        me->me_type_malloced = 1;
        me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
        me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
        me->me_dev = dev_from_mount_options (mnt->mnt_opts);

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }

    if (endmntent (fp) == 0)
      goto free_then_fail;
  }
#endif /* MOUNTED_GETMNTENT1. */

#ifdef MOUNTED_GETMNTINFO       /* 4.4BSD.  */
  {
    struct statfs *fsp;
    int entries;

    entries = getmntinfo (&fsp, MNT_NOWAIT);
    if (entries < 0)
      return NULL;
    for (; entries-- > 0; fsp++)
      {
        char *fs_type = fsp_to_string (fsp);

        me = xmalloc (sizeof *me);
        me->me_devname = xstrdup (fsp->f_mntfromname);
        me->me_mountdir = xstrdup (fsp->f_mntonname);
        me->me_type = fs_type;
        me->me_type_malloced = 0;
        me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
        me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
        me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }
  }
#endif /* MOUNTED_GETMNTINFO */

#ifdef MOUNTED_GETMNTINFO2      /* NetBSD 3.0.  */
  {
    struct statvfs *fsp;
    int entries;

    entries = getmntinfo (&fsp, MNT_NOWAIT);
    if (entries < 0)
      return NULL;
    for (; entries-- > 0; fsp++)
      {
        me = xmalloc (sizeof *me);
        me->me_devname = xstrdup (fsp->f_mntfromname);
        me->me_mountdir = xstrdup (fsp->f_mntonname);
        me->me_type = xstrdup (fsp->f_fstypename);
        me->me_type_malloced = 1;
        me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
        me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
        me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }
  }
#endif /* MOUNTED_GETMNTINFO2 */

#ifdef MOUNTED_GETMNT           /* Ultrix.  */
  {
    int offset = 0;
    int val;
    struct fs_data fsd;

    while (errno = 0,
           0 < (val = getmnt (&offset, &fsd, sizeof (fsd), NOSTAT_MANY,
                              (char *) 0)))
      {
        me = xmalloc (sizeof *me);
        me->me_devname = xstrdup (fsd.fd_req.devname);
        me->me_mountdir = xstrdup (fsd.fd_req.path);
        me->me_type = gt_names[fsd.fd_req.fstype];
        me->me_type_malloced = 0;
        me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
        me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
        me->me_dev = fsd.fd_req.dev;

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }
    if (val < 0)
      goto free_then_fail;
  }
#endif /* MOUNTED_GETMNT. */

#if defined MOUNTED_FS_STAT_DEV /* BeOS */
  {
    /* The next_dev() and fs_stat_dev() system calls give the list of
       all file systems, including the information returned by statvfs()
       (fs type, total blocks, free blocks etc.), but without the mount
       point. But on BeOS all file systems except / are mounted in the
       rootfs, directly under /.
       The directory name of the mount point is often, but not always,
       identical to the volume name of the device.
       We therefore get the list of subdirectories of /, and the list
       of all file systems, and match the two lists.  */

    DIR *dirp;
    struct rootdir_entry
      {
        char *name;
        dev_t dev;
        ino_t ino;
        struct rootdir_entry *next;
      };
    struct rootdir_entry *rootdir_list;
    struct rootdir_entry **rootdir_tail;
    int32 pos;
    dev_t dev;
    fs_info fi;

    /* All volumes are mounted in the rootfs, directly under /. */
    rootdir_list = NULL;
    rootdir_tail = &rootdir_list;
    dirp = opendir ("/");
    if (dirp)
      {
        struct dirent *d;

        while ((d = readdir (dirp)) != NULL)
          {
            char *name;
            struct stat statbuf;

            if (strcmp (d->d_name, "..") == 0)
              continue;

            if (strcmp (d->d_name, ".") == 0)
              name = xstrdup ("/");
            else
              {
                name = xmalloc (1 + strlen (d->d_name) + 1);
                name[0] = '/';
                strcpy (name + 1, d->d_name);
              }

            if (lstat (name, &statbuf) >= 0 && S_ISDIR (statbuf.st_mode))
              {
                struct rootdir_entry *re = xmalloc (sizeof *re);
                re->name = name;
                re->dev = statbuf.st_dev;
                re->ino = statbuf.st_ino;

                /* Add to the linked list.  */
                *rootdir_tail = re;
                rootdir_tail = &re->next;
              }
            else
              free (name);
          }
        closedir (dirp);
      }
    *rootdir_tail = NULL;

    for (pos = 0; (dev = next_dev (&pos)) >= 0; )
      if (fs_stat_dev (dev, &fi) >= 0)
        {
          /* Note: fi.dev == dev. */
          struct rootdir_entry *re;

          for (re = rootdir_list; re; re = re->next)
            if (re->dev == fi.dev && re->ino == fi.root)
              break;

          me = xmalloc (sizeof *me);
          me->me_devname = xstrdup (fi.device_name[0] != '\0' ? fi.device_name : fi.fsh_name);
          me->me_mountdir = xstrdup (re != NULL ? re->name : fi.fsh_name);
          me->me_type = xstrdup (fi.fsh_name);
          me->me_type_malloced = 1;
          me->me_dev = fi.dev;
          me->me_dummy = 0;
          me->me_remote = (fi.flags & B_FS_IS_SHARED) != 0;

          /* Add to the linked list. */
          *mtail = me;
          mtail = &me->me_next;
        }
    *mtail = NULL;

    while (rootdir_list != NULL)
      {
        struct rootdir_entry *re = rootdir_list;
        rootdir_list = re->next;
        free (re->name);
        free (re);
      }
  }
#endif /* MOUNTED_FS_STAT_DEV */

#if defined MOUNTED_GETFSSTAT   /* __alpha running OSF_1 */
  {
    int numsys, counter;
    size_t bufsize;
    struct statfs *stats;

    numsys = getfsstat ((struct statfs *)0, 0L, MNT_NOWAIT);
    if (numsys < 0)
      return (NULL);
    if (SIZE_MAX / sizeof *stats <= numsys)
      xalloc_die ();

    bufsize = (1 + numsys) * sizeof *stats;
    stats = xmalloc (bufsize);
    numsys = getfsstat (stats, bufsize, MNT_NOWAIT);

    if (numsys < 0)
      {
        free (stats);
        return (NULL);
      }

    for (counter = 0; counter < numsys; counter++)
      {
        me = xmalloc (sizeof *me);
        me->me_devname = xstrdup (stats[counter].f_mntfromname);
        me->me_mountdir = xstrdup (stats[counter].f_mntonname);
        me->me_type = xstrdup (FS_TYPE (stats[counter]));
        me->me_type_malloced = 1;
        me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
        me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
        me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }

    free (stats);
  }
#endif /* MOUNTED_GETFSSTAT */

#if defined MOUNTED_FREAD || defined MOUNTED_FREAD_FSTYP /* SVR[23].  */
  {
    struct mnttab mnt;
    char *table = "/etc/mnttab";
    FILE *fp;

    fp = fopen (table, "r");
    if (fp == NULL)
      return NULL;

    while (fread (&mnt, sizeof mnt, 1, fp) > 0)
      {
        me = xmalloc (sizeof *me);
# ifdef GETFSTYP                        /* SVR3.  */
        me->me_devname = xstrdup (mnt.mt_dev);
# else
        me->me_devname = xmalloc (strlen (mnt.mt_dev) + 6);
        strcpy (me->me_devname, "/dev/");
        strcpy (me->me_devname + 5, mnt.mt_dev);
# endif
        me->me_mountdir = xstrdup (mnt.mt_filsys);
        me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */
        me->me_type = "";
        me->me_type_malloced = 0;
# ifdef GETFSTYP                        /* SVR3.  */
        if (need_fs_type)
          {
            struct statfs fsd;
            char typebuf[FSTYPSZ];

            if (statfs (me->me_mountdir, &fsd, sizeof fsd, 0) != -1
                && sysfs (GETFSTYP, fsd.f_fstyp, typebuf) != -1)
              {
                me->me_type = xstrdup (typebuf);
                me->me_type_malloced = 1;
              }
          }
# endif
        me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
        me->me_remote = ME_REMOTE (me->me_devname, me->me_type);

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }

    if (ferror (fp))
      {
        /* The last fread() call must have failed.  */
        int saved_errno = errno;
        fclose (fp);
        errno = saved_errno;
        goto free_then_fail;
      }

    if (fclose (fp) == EOF)
      goto free_then_fail;
  }
#endif /* MOUNTED_FREAD || MOUNTED_FREAD_FSTYP.  */

#ifdef MOUNTED_GETMNTTBL        /* DolphinOS goes its own way.  */
  {
    struct mntent **mnttbl = getmnttbl (), **ent;
    for (ent=mnttbl;*ent;ent++)
      {
        me = xmalloc (sizeof *me);
        me->me_devname = xstrdup ( (*ent)->mt_resource);
        me->me_mountdir = xstrdup ( (*ent)->mt_directory);
        me->me_type = xstrdup ((*ent)->mt_fstype);
        me->me_type_malloced = 1;
        me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
        me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
        me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }
    endmnttbl ();
  }
#endif

#ifdef MOUNTED_GETMNTENT2       /* SVR4.  */
  {
    struct mnttab mnt;
    char *table = MNTTAB;
    FILE *fp;
    int ret;
    int lockfd = -1;

# if defined F_RDLCK && defined F_SETLKW
    /* MNTTAB_LOCK is a macro name of our own invention; it's not present in
       e.g. Solaris 2.6.  If the SVR4 folks ever define a macro
       for this file name, we should use their macro name instead.
       (Why not just lock MNTTAB directly?  We don't know.)  */
#  ifndef MNTTAB_LOCK
#   define MNTTAB_LOCK "/etc/.mnttab.lock"
#  endif
    lockfd = open (MNTTAB_LOCK, O_RDONLY);
    if (0 <= lockfd)
      {
        struct flock flock;
        flock.l_type = F_RDLCK;
        flock.l_whence = SEEK_SET;
        flock.l_start = 0;
        flock.l_len = 0;
        while (fcntl (lockfd, F_SETLKW, &flock) == -1)
          if (errno != EINTR)
            {
              int saved_errno = errno;
              close (lockfd);
              errno = saved_errno;
              return NULL;
            }
      }
    else if (errno != ENOENT)
      return NULL;
# endif

    errno = 0;
    fp = fopen (table, "r");
    if (fp == NULL)
      ret = errno;
    else
      {
        while ((ret = getmntent (fp, &mnt)) == 0)
          {
            me = xmalloc (sizeof *me);
            me->me_devname = xstrdup (mnt.mnt_special);
            me->me_mountdir = xstrdup (mnt.mnt_mountp);
            me->me_type = xstrdup (mnt.mnt_fstype);
            me->me_type_malloced = 1;
            me->me_dummy = MNT_IGNORE (&mnt) != 0;
            me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
            me->me_dev = dev_from_mount_options (mnt.mnt_mntopts);

            /* Add to the linked list. */
            *mtail = me;
            mtail = &me->me_next;
          }

        ret = fclose (fp) == EOF ? errno : 0 < ret ? 0 : -1;
      }

    if (0 <= lockfd && close (lockfd) != 0)
      ret = errno;

    if (0 <= ret)
      {
        errno = ret;
        goto free_then_fail;
      }
  }
#endif /* MOUNTED_GETMNTENT2.  */

#ifdef MOUNTED_VMOUNT           /* AIX.  */
  {
    int bufsize;
    char *entries, *thisent;
    struct vmount *vmp;
    int n_entries;
    int i;

    /* Ask how many bytes to allocate for the mounted file system info.  */
    if (mntctl (MCTL_QUERY, sizeof bufsize, (struct vmount *) &bufsize) != 0)
      return NULL;
    entries = xmalloc (bufsize);

    /* Get the list of mounted file systems.  */
    n_entries = mntctl (MCTL_QUERY, bufsize, (struct vmount *) entries);
    if (n_entries < 0)
      {
        int saved_errno = errno;
        free (entries);
        errno = saved_errno;
        return NULL;
      }

    for (i = 0, thisent = entries;
         i < n_entries;
         i++, thisent += vmp->vmt_length)
      {
        char *options, *ignore;

        vmp = (struct vmount *) thisent;
        me = xmalloc (sizeof *me);
        if (vmp->vmt_flags & MNT_REMOTE)
          {
            char *host, *dir;

            me->me_remote = 1;
            /* Prepend the remote dirname.  */
            host = thisent + vmp->vmt_data[VMT_HOSTNAME].vmt_off;
            dir = thisent + vmp->vmt_data[VMT_OBJECT].vmt_off;
            me->me_devname = xmalloc (strlen (host) + strlen (dir) + 2);
            strcpy (me->me_devname, host);
            strcat (me->me_devname, ":");
            strcat (me->me_devname, dir);
          }
        else
          {
            me->me_remote = 0;
            me->me_devname = xstrdup (thisent +
                                      vmp->vmt_data[VMT_OBJECT].vmt_off);
          }
        me->me_mountdir = xstrdup (thisent + vmp->vmt_data[VMT_STUB].vmt_off);
        me->me_type = xstrdup (fstype_to_string (vmp->vmt_gfstype));
        me->me_type_malloced = 1;
        options = thisent + vmp->vmt_data[VMT_ARGS].vmt_off;
        ignore = strstr (options, "ignore");
        me->me_dummy = (ignore
                        && (ignore == options || ignore[-1] == ',')
                        && (ignore[sizeof "ignore" - 1] == ','
                            || ignore[sizeof "ignore" - 1] == '\0'));
        me->me_dev = (dev_t) -1; /* vmt_fsid might be the info we want.  */

        /* Add to the linked list. */
        *mtail = me;
        mtail = &me->me_next;
      }
    free (entries);
  }
#endif /* MOUNTED_VMOUNT. */

  *mtail = NULL;
  return mount_list;


 free_then_fail:
  {
    int saved_errno = errno;
    *mtail = NULL;

    while (mount_list)
      {
        me = mount_list->me_next;
        free (mount_list->me_devname);
        free (mount_list->me_mountdir);
        if (mount_list->me_type_malloced)
          free (mount_list->me_type);
        free (mount_list);
        mount_list = me;
      }

    errno = saved_errno;
    return NULL;
  }
}

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