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- /* $NetBSD: datefs.c,v 1.18 2008/11/26 14:03:48 pooka Exp $ */
- /*
- * Copyright (c) 2007 Antti Kantee. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /*
- * datefs: puffs nullfs example
- */
- #include <err.h>
- #include <puffs.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <time.h>
- static void usage(void);
- PUFFSOP_PROTOS(datefs)
- static void
- usage()
- {
- errx(1, "usage: %s [-s] [-o mntopts] nullpath mountpath",
- getprogname());
- }
- int
- main(int argc, char *argv[])
- {
- struct puffs_usermount *pu;
- struct puffs_ops *pops;
- struct puffs_pathobj *po_root;
- struct puffs_node *node;
- struct stat sb;
- mntoptparse_t mp;
- int mntflags, pflags;
- int ch;
- int detach;
- setprogname(argv[0]);
- if (argc < 3)
- usage();
- pflags = mntflags = 0;
- detach = 1;
- while ((ch = getopt(argc, argv, "o:s")) != -1) {
- switch (ch) {
- case 'o':
- mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
- if (mp == NULL)
- err(1, "getmntopts");
- freemntopts(mp);
- break;
- case 's':
- detach = 0;
- break;
- }
- }
- pflags |= PUFFS_FLAG_BUILDPATH;
- argv += optind;
- argc -= optind;
- if (pflags & PUFFS_FLAG_OPDUMP)
- detach = 0;
- if (argc != 2)
- usage();
- if (lstat(argv[0], &sb) == -1)
- err(1, "stat %s", argv[0]);
- if ((sb.st_mode & S_IFDIR) == 0)
- errx(1, "%s is not a directory", argv[0]);
- PUFFSOP_INIT(pops);
- puffs_null_setops(pops);
- PUFFSOP_SET(pops, datefs, node, readdir);
- PUFFSOP_SET(pops, datefs, node, read);
- PUFFSOP_SET(pops, datefs, node, write);
- if ((pu = puffs_init(pops, argv[0], "datefs", NULL, pflags)) == NULL)
- err(1, "init");
- node = puffs_pn_new(pu, NULL);
- if (node == NULL)
- err(1, "puffs_pn_new");
- puffs_setroot(pu, node);
- puffs_setfhsize(pu, 0, PUFFS_FHFLAG_PASSTHROUGH);
- po_root = puffs_getrootpathobj(pu);
- if (po_root == NULL)
- err(1, "getrootpathobj");
- po_root->po_path = argv[0];
- po_root->po_len = strlen(argv[0]);
- puffs_stat2vattr(&node->pn_va, &sb);
- if (detach)
- if (puffs_daemon(pu, 1, 1) == -1)
- err(1, "puffs_daemon");
- if (puffs_mount(pu, argv[1], mntflags, node) == -1)
- err(1, "puffs_mount");
- if (puffs_mainloop(pu) == -1)
- err(1, "mainloop");
- return 0;
- }
- static void
- get_date(char *buf, size_t bufsz)
- {
- static time_t tval;
- struct tm *tm;
- if (time(&tval) == -1) {
- strncpy(buf, "unknown_date.txt", bufsz);
- return;
- }
- if ((tm = localtime(&tval)) == NULL) {
- strncpy(buf, "unknown_date.txt", bufsz);
- }
- strftime(buf, bufsz, "%Y%m%d-%H%M%S.txt", tm);
- return;
- }
- int
- datefs_node_readdir(
- struct puffs_usermount *pu,
- void *opc, struct dirent *dent,
- off_t *readoff,
- size_t *reslen,
- const struct puffs_cred *pcr,
- int *eofflag,
- off_t *cookies,
- size_t *ncookies)
- {
- struct dirent *dp;
- size_t rl;
- int rv;
- char buf[BUFSIZ];
- dp = dent;
- rl = *reslen;
- rv = puffs_null_node_readdir(pu, opc, dent, readoff, reslen, pcr,
- eofflag, cookies, ncookies);
- if (rv)
- return rv;
- get_date(buf, BUFSIZ);
- while (rl > *reslen) {
- strcpy(dp->d_name, buf);
- dp->d_namlen = strlen(buf);
- rl -= _DIRENT_SIZE(dp);
- dp = _DIRENT_NEXT(dp);
- }
- return 0;
- }
- int
- datefs_node_read(
- struct puffs_usermount *pu,
- void *opc,
- uint8_t *buf,
- off_t offset,
- size_t *resid,
- const struct puffs_cred *pcr,
- int ioflag)
- {
- uint8_t *prebuf = buf;
- size_t preres = *resid;
- int rv;
- rv = puffs_null_node_read(pu, opc, buf, offset, resid, pcr, ioflag);
- if (rv)
- return rv;
- get_date((char *)prebuf, preres - *resid);
- return rv;
- }
- int
- datefs_node_write(
- struct puffs_usermount *pu,
- void *opc,
- uint8_t *buf,
- off_t offset,
- size_t *resid,
- const struct puffs_cred *pcr,
- int ioflag)
- {
- get_date((char *)buf, *resid);
- return puffs_null_node_write(pu, opc, buf, offset, resid, pcr, ioflag);
- }
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