4 * Userland daemon for idmap.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Marius Aamodt Eriksen <marius@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 #include <sys/types.h>
40 #include <sys/socket.h>
44 #include "nfs_idmap.h"
66 #endif /* HAVE_CONFIG_H */
74 #define PIPEFS_DIR "/var/lib/nfs/rpc_pipefs/"
78 #define NFSD_DIR "/proc/net/rpc"
81 #ifndef CLIENT_CACHE_TIMEOUT_FILE
82 #define CLIENT_CACHE_TIMEOUT_FILE "/proc/sys/fs/nfs/idmap_cache_timeout"
85 #ifndef NFS4NOBODY_USER
86 #define NFS4NOBODY_USER "nobody"
89 #ifndef NFS4NOBODY_GROUP
90 #define NFS4NOBODY_GROUP "nobody"
94 #define CONF_SAVE(w, f) do { \
101 #define IC_IDNAME_CHAN NFSD_DIR "/nfs4.idtoname/channel"
102 #define IC_IDNAME_FLUSH NFSD_DIR "/nfs4.idtoname/flush"
105 #define IC_NAMEID_CHAN NFSD_DIR "/nfs4.nametoid/channel"
106 #define IC_NAMEID_FLUSH NFSD_DIR "/nfs4.nametoid/flush"
108 struct idmap_client {
112 char ic_path[PATH_MAX];
116 struct event ic_event;
117 TAILQ_ENTRY(idmap_client) ic_next;
119 static struct idmap_client nfsd_ic[2] = {
121 .ic_which = IC_IDNAME,
124 .ic_path = IC_IDNAME_CHAN,
130 .ic_which = IC_NAMEID,
133 .ic_path = IC_NAMEID_CHAN,
140 TAILQ_HEAD(idmap_clientq, idmap_client);
142 static void dirscancb(int, short, void *);
143 static void clntscancb(int, short, void *);
144 static void svrreopen(int, short, void *);
145 static int nfsopen(struct idmap_client *);
146 static void nfscb(int, short, void *);
147 static void nfsdcb(int, short, void *);
148 static int addfield(char **, ssize_t *, char *);
149 static int getfield(char **, char *, size_t);
151 static void imconv(struct idmap_client *, struct idmap_msg *);
152 static void idtonameres(struct idmap_msg *);
153 static void nametoidres(struct idmap_msg *);
155 static int nfsdopen(void);
156 static int nfsdopenone(struct idmap_client *);
157 static void nfsdreopen_one(struct idmap_client *);
158 static void nfsdreopen(void);
160 void mydaemon(int, int);
161 void release_parent(void);
163 static int verbose = 0;
164 #define DEFAULT_IDMAP_CACHE_EXPIRY 600 /* seconds */
165 static int cache_entry_expiration = 0;
166 static char pipefsdir[PATH_MAX];
167 static char *nobodyuser, *nobodygroup;
168 static uid_t nobodyuid;
169 static gid_t nobodygid;
171 /* Used by conffile.c in libnfs.a */
175 flush_nfsd_cache(char *path, time_t now)
180 sprintf(stime, "%ld\n", now);
181 fd = open(path, O_RDWR);
184 if (write(fd, stime, strlen(stime)) != (ssize_t)strlen(stime)) {
185 errx(1, "Flushing nfsd cache failed: errno %d (%s)",
186 errno, strerror(errno));
193 flush_nfsd_idmap_cache(void)
195 time_t now = time(NULL);
198 ret = flush_nfsd_cache(IC_IDNAME_FLUSH, now);
201 ret = flush_nfsd_cache(IC_NAMEID_FLUSH, now);
206 main(int argc, char **argv)
208 int fd = 0, opt, fg = 0, nfsdret = -1;
209 struct idmap_clientq icq;
210 struct event rootdirev, clntdirev, svrdirev;
211 struct event initialize;
215 char *xpipefsdir = NULL;
216 int serverstart = 1, clientstart = 1;
220 conf_path = _PATH_IDMAPDCONF;
221 nobodyuser = NFS4NOBODY_USER;
222 nobodygroup = NFS4NOBODY_GROUP;
223 strlcpy(pipefsdir, PIPEFS_DIR, sizeof(pipefsdir));
225 if ((progname = strrchr(argv[0], '/')))
231 #define GETOPTSTR "vfd:p:U:G:c:CS"
232 opterr=0; /* Turn off error messages */
233 while ((opt = getopt(argc, argv, GETOPTSTR)) != -1) {
237 if (strchr(GETOPTSTR, optopt))
238 errx(1, "'-%c' option requires an argument.", optopt);
240 errx(1, "'-%c' is an invalid argument.", optopt);
245 if (stat(conf_path, &sb) == -1 && (errno == ENOENT || errno == EACCES)) {
246 warn("Skipping configuration file \"%s\"", conf_path);
250 verbose = conf_get_num("General", "Verbosity", 0);
251 cache_entry_expiration = conf_get_num("General",
252 "Cache-Expiration", DEFAULT_IDMAP_CACHE_EXPIRY);
253 CONF_SAVE(xpipefsdir, conf_get_str("General", "Pipefs-Directory"));
254 if (xpipefsdir != NULL)
255 strlcpy(pipefsdir, xpipefsdir, sizeof(pipefsdir));
256 CONF_SAVE(nobodyuser, conf_get_str("Mapping", "Nobody-User"));
257 CONF_SAVE(nobodygroup, conf_get_str("Mapping", "Nobody-Group"));
260 while ((opt = getopt(argc, argv, GETOPTSTR)) != -1)
269 strlcpy(pipefsdir, optarg, sizeof(pipefsdir));
274 errx(1, "the -d, -U, and -G options have been removed;"
275 " please use the configuration file instead.");
286 if (!serverstart && !clientstart)
287 errx(1, "it is illegal to specify both -C and -S");
289 strncat(pipefsdir, "/nfs", sizeof(pipefsdir));
291 if ((pw = getpwnam(nobodyuser)) == NULL)
292 errx(1, "Could not find user \"%s\"", nobodyuser);
293 nobodyuid = pw->pw_uid;
295 if ((gr = getgrnam(nobodygroup)) == NULL)
296 errx(1, "Could not find group \"%s\"", nobodygroup);
297 nobodygid = gr->gr_gid;
299 #ifdef HAVE_NFS4_SET_DEBUG
300 nfs4_set_debug(verbose, xlog_warn);
302 if (conf_path == NULL)
303 conf_path = _PATH_IDMAPDCONF;
304 if (nfs4_init_name_mapping(conf_path))
305 errx(1, "Unable to create name to user id mappings.");
313 xlog_warn("Expiration time is %d seconds.",
314 cache_entry_expiration);
316 nfsdret = nfsdopen();
318 ret = flush_nfsd_idmap_cache();
320 xlog_err("main: Failed to flush nfsd idmap cache\n: %s", strerror(errno));
325 struct timeval now = {
330 if (cache_entry_expiration != DEFAULT_IDMAP_CACHE_EXPIRY) {
332 char timeout_buf[12];
333 if ((timeout_fd = open(CLIENT_CACHE_TIMEOUT_FILE,
335 xlog_warn("Unable to open '%s' to set "
336 "client cache expiration time "
338 CLIENT_CACHE_TIMEOUT_FILE,
339 cache_entry_expiration);
341 len = snprintf(timeout_buf, sizeof(timeout_buf),
342 "%d", cache_entry_expiration);
343 if ((write(timeout_fd, timeout_buf, len)) != len)
344 xlog_warn("Error writing '%s' to "
345 "'%s' to set client "
346 "cache expiration time\n",
348 CLIENT_CACHE_TIMEOUT_FILE);
353 if ((fd = open(pipefsdir, O_RDONLY)) == -1)
354 xlog_err("main: open(%s): %s", pipefsdir, strerror(errno));
356 if (fcntl(fd, F_SETSIG, SIGUSR1) == -1)
357 xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
359 if (fcntl(fd, F_NOTIFY,
360 DN_CREATE | DN_DELETE | DN_MODIFY | DN_MULTISHOT) == -1) {
361 xlog_err("main: fcntl(%s): %s", pipefsdir, strerror(errno));
363 xlog_err("main: Possibly no Dnotify support in kernel.");
367 /* These events are persistent */
368 signal_set(&rootdirev, SIGUSR1, dirscancb, &icq);
369 signal_add(&rootdirev, NULL);
370 signal_set(&clntdirev, SIGUSR2, clntscancb, &icq);
371 signal_add(&clntdirev, NULL);
372 signal_set(&svrdirev, SIGHUP, svrreopen, NULL);
373 signal_add(&svrdirev, NULL);
375 /* Fetch current state */
376 /* (Delay till start of event_dispatch to avoid possibly losing
377 * a SIGUSR1 between here and the call to event_dispatch().) */
378 evtimer_set(&initialize, dirscancb, &icq);
379 evtimer_add(&initialize, &now);
382 if (nfsdret != 0 && fd == 0)
383 xlog_err("main: Neither NFS client nor NFSd found");
387 if (event_dispatch() < 0)
388 xlog_err("main: event_dispatch returns errno %d (%s)",
389 errno, strerror(errno));
395 dirscancb(int UNUSED(fd), short UNUSED(which), void *data)
398 struct dirent **ents;
399 struct idmap_client *ic, *nextic;
401 struct idmap_clientq *icq = data;
403 nent = scandir(pipefsdir, &ents, NULL, alphasort);
405 xlog_warn("dirscancb: scandir(%s): %s", pipefsdir, strerror(errno));
409 for (i = 0; i < nent; i++) {
410 if (ents[i]->d_reclen > 4 &&
411 strncmp(ents[i]->d_name, "clnt", 4) == 0) {
412 TAILQ_FOREACH(ic, icq, ic_next)
413 if (strcmp(ents[i]->d_name + 4, ic->ic_clid) == 0)
418 if ((ic = calloc(1, sizeof(*ic))) == NULL)
420 strlcpy(ic->ic_clid, ents[i]->d_name + 4,
421 sizeof(ic->ic_clid));
423 snprintf(path, sizeof(path), "%s/%s",
424 pipefsdir, ents[i]->d_name);
426 if ((ic->ic_dirfd = open(path, O_RDONLY, 0)) == -1) {
427 xlog_warn("dirscancb: open(%s): %s", path, strerror(errno));
432 strlcat(path, "/idmap", sizeof(path));
433 strlcpy(ic->ic_path, path, sizeof(ic->ic_path));
436 xlog_warn("New client: %s", ic->ic_clid);
438 if (nfsopen(ic) == -1) {
444 ic->ic_id = "Client";
446 TAILQ_INSERT_TAIL(icq, ic, ic_next);
453 ic = TAILQ_FIRST(icq);
455 nextic=TAILQ_NEXT(ic, ic_next);
456 if (!ic->ic_scanned) {
457 event_del(&ic->ic_event);
460 TAILQ_REMOVE(icq, ic, ic_next);
462 xlog_warn("Stale client: %s", ic->ic_clid);
463 xlog_warn("\t-> closed %s", ic->ic_path);
472 for (i = 0; i < nent; i++)
479 svrreopen(int UNUSED(fd), short UNUSED(which), void *UNUSED(data))
485 clntscancb(int UNUSED(fd), short UNUSED(which), void *data)
487 struct idmap_clientq *icq = data;
488 struct idmap_client *ic;
490 TAILQ_FOREACH(ic, icq, ic_next)
491 if (ic->ic_fd == -1 && nfsopen(ic) == -1) {
493 TAILQ_REMOVE(icq, ic, ic_next);
499 nfsdcb(int UNUSED(fd), short which, void *data)
501 struct idmap_client *ic = data;
503 u_char buf[IDMAP_MAXMSGSZ + 1];
506 char *bp, typebuf[IDMAP_MAXMSGSZ],
507 buf1[IDMAP_MAXMSGSZ], authbuf[IDMAP_MAXMSGSZ], *p;
510 if (which != EV_READ)
513 if ((len = read(ic->ic_fd, buf, sizeof(buf))) <= 0) {
514 xlog_warn("nfsdcb: read(%s) failed: errno %d (%s)",
515 ic->ic_path, len?errno:0,
516 len?strerror(errno):"End of File");
521 /* Get rid of newline and terminate buffer*/
525 memset(&im, 0, sizeof(im));
527 /* Authentication name -- ignored for now*/
528 if (getfield(&bp, authbuf, sizeof(authbuf)) == -1) {
529 xlog_warn("nfsdcb: bad authentication name in upcall\n");
532 if (getfield(&bp, typebuf, sizeof(typebuf)) == -1) {
533 xlog_warn("nfsdcb: bad type in upcall\n");
537 xlog_warn("nfsdcb: authbuf=%s authtype=%s",
540 im.im_type = strcmp(typebuf, "user") == 0 ?
541 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
543 switch (ic->ic_which) {
545 im.im_conv = IDMAP_CONV_NAMETOID;
546 if (getfield(&bp, im.im_name, sizeof(im.im_name)) == -1) {
547 xlog_warn("nfsdcb: bad name in upcall\n");
552 im.im_conv = IDMAP_CONV_IDTONAME;
553 if (getfield(&bp, buf1, sizeof(buf1)) == -1) {
554 xlog_warn("nfsdcb: bad id in upcall\n");
557 tmp = strtoul(buf1, (char **)NULL, 10);
558 im.im_id = (u_int32_t)tmp;
559 if ((tmp == ULONG_MAX && errno == ERANGE)
560 || (unsigned long)im.im_id != tmp) {
561 xlog_warn("nfsdcb: id '%s' too big!\n", buf1);
566 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
576 /* Authentication name */
577 addfield(&bp, &bsiz, authbuf);
579 switch (ic->ic_which) {
582 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
583 addfield(&bp, &bsiz, p);
585 addfield(&bp, &bsiz, im.im_name);
587 snprintf(buf1, sizeof(buf1), "%lu",
588 time(NULL) + cache_entry_expiration);
589 addfield(&bp, &bsiz, buf1);
590 /* Note that we don't want to write the id if the mapping
591 * failed; instead, by leaving it off, we write a negative
592 * cache entry which will result in an error returned to
593 * the client. We don't want a chown or setacl referring
594 * to an unknown user to result in giving permissions to
596 if (im.im_status == IDMAP_STATUS_SUCCESS) {
598 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
599 addfield(&bp, &bsiz, buf1);
602 //if (bsiz == sizeof(buf)) /* XXX */
609 p = im.im_type == IDMAP_TYPE_USER ? "user" : "group";
610 addfield(&bp, &bsiz, p);
612 snprintf(buf1, sizeof(buf1), "%u", im.im_id);
613 addfield(&bp, &bsiz, buf1);
615 snprintf(buf1, sizeof(buf1), "%lu",
616 time(NULL) + cache_entry_expiration);
617 addfield(&bp, &bsiz, buf1);
618 /* Note we're ignoring the status field in this case; we'll
619 * just map to nobody instead. */
621 addfield(&bp, &bsiz, im.im_name);
627 xlog_warn("nfsdcb: Unknown which type %d", ic->ic_which);
631 bsiz = sizeof(buf) - bsiz;
633 if (atomicio((void*)write, ic->ic_fd, buf, bsiz) != bsiz)
634 xlog_warn("nfsdcb: write(%s) failed: errno %d (%s)",
635 ic->ic_path, errno, strerror(errno));
638 event_add(&ic->ic_event, NULL);
642 imconv(struct idmap_client *ic, struct idmap_msg *im)
646 switch (im->im_conv) {
647 case IDMAP_CONV_IDTONAME:
650 xlog_warn("%s %s: (%s) id \"%d\" -> name \"%s\"",
651 ic->ic_id, ic->ic_clid,
652 im->im_type == IDMAP_TYPE_USER ? "user" : "group",
653 im->im_id, im->im_name);
655 case IDMAP_CONV_NAMETOID:
656 len = strnlen(im->im_name, IDMAP_NAMESZ - 1);
657 /* Check for NULL termination just to be careful */
658 if (im->im_name[len+1] != '\0')
662 xlog_warn("%s %s: (%s) name \"%s\" -> id \"%d\"",
663 ic->ic_id, ic->ic_clid,
664 im->im_type == IDMAP_TYPE_USER ? "user" : "group",
665 im->im_name, im->im_id);
668 xlog_warn("imconv: Invalid conversion type (%d) in message",
670 im->im_status |= IDMAP_STATUS_INVALIDMSG;
676 nfscb(int UNUSED(fd), short which, void *data)
678 struct idmap_client *ic = data;
681 if (which != EV_READ)
684 if (atomicio(read, ic->ic_fd, &im, sizeof(im)) != sizeof(im)) {
686 xlog_warn("nfscb: read(%s): %s", ic->ic_path, strerror(errno));
694 /* XXX: I don't like ignoring this error in the id->name case,
695 * but we've never returned it, and I need to check that the client
696 * can handle it gracefully before starting to return it now. */
698 if (im.im_status == IDMAP_STATUS_LOOKUPFAIL)
699 im.im_status = IDMAP_STATUS_SUCCESS;
701 if (atomicio((void*)write, ic->ic_fd, &im, sizeof(im)) != sizeof(im))
702 xlog_warn("nfscb: write(%s): %s", ic->ic_path, strerror(errno));
704 event_add(&ic->ic_event, NULL);
708 nfsdreopen_one(struct idmap_client *ic)
713 xlog_warn("ReOpening %s", ic->ic_path);
715 if ((fd = open(ic->ic_path, O_RDWR, 0)) != -1) {
716 if ((ic->ic_event.ev_flags & EVLIST_INIT))
717 event_del(&ic->ic_event);
721 ic->ic_event.ev_fd = ic->ic_fd = fd;
722 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
723 event_add(&ic->ic_event, NULL);
725 xlog_warn("nfsdreopen: Opening '%s' failed: errno %d (%s)",
726 ic->ic_path, errno, strerror(errno));
733 nfsdreopen_one(&nfsd_ic[IC_NAMEID]);
734 nfsdreopen_one(&nfsd_ic[IC_IDNAME]);
741 return ((nfsdopenone(&nfsd_ic[IC_NAMEID]) == 0 &&
742 nfsdopenone(&nfsd_ic[IC_IDNAME]) == 0) ? 0 : -1);
746 nfsdopenone(struct idmap_client *ic)
748 if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
750 xlog_warn("nfsdopenone: Opening %s failed: "
752 ic->ic_path, errno, strerror(errno));
756 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfsdcb, ic);
757 event_add(&ic->ic_event, NULL);
760 xlog_warn("Opened %s", ic->ic_path);
766 nfsopen(struct idmap_client *ic)
768 if ((ic->ic_fd = open(ic->ic_path, O_RDWR, 0)) == -1) {
771 fcntl(ic->ic_dirfd, F_SETSIG, SIGUSR2);
772 fcntl(ic->ic_dirfd, F_NOTIFY,
773 DN_CREATE | DN_DELETE | DN_MULTISHOT);
776 xlog_warn("nfsopen: open(%s): %s", ic->ic_path, strerror(errno));
780 event_set(&ic->ic_event, ic->ic_fd, EV_READ, nfscb, ic);
781 event_add(&ic->ic_event, NULL);
782 fcntl(ic->ic_dirfd, F_NOTIFY, 0);
783 fcntl(ic->ic_dirfd, F_SETSIG, 0);
785 xlog_warn("Opened %s", ic->ic_path);
792 idtonameres(struct idmap_msg *im)
794 char domain[NFS4_MAX_DOMAIN_LEN];
797 ret = nfs4_get_default_domain(NULL, domain, sizeof(domain));
798 switch (im->im_type) {
799 case IDMAP_TYPE_USER:
800 ret = nfs4_uid_to_name(im->im_id, domain, im->im_name,
801 sizeof(im->im_name));
803 if (strlen(nobodyuser) < sizeof(im->im_name))
804 strcpy(im->im_name, nobodyuser);
806 strcpy(im->im_name, NFS4NOBODY_USER);
809 case IDMAP_TYPE_GROUP:
810 ret = nfs4_gid_to_name(im->im_id, domain, im->im_name,
811 sizeof(im->im_name));
813 if (strlen(nobodygroup) < sizeof(im->im_name))
814 strcpy(im->im_name, nobodygroup);
816 strcpy(im->im_name, NFS4NOBODY_GROUP);
821 im->im_status = IDMAP_STATUS_LOOKUPFAIL;
823 im->im_status = IDMAP_STATUS_SUCCESS;
827 nametoidres(struct idmap_msg *im)
833 /* XXX: move nobody stuff to library calls
834 * (nfs4_get_nobody_user(domain), nfs4_get_nobody_group(domain)) */
836 im->im_status = IDMAP_STATUS_SUCCESS;
838 switch (im->im_type) {
839 case IDMAP_TYPE_USER:
840 ret = nfs4_name_to_uid(im->im_name, &uid);
841 im->im_id = (u_int32_t) uid;
843 im->im_status = IDMAP_STATUS_LOOKUPFAIL;
844 im->im_id = nobodyuid;
847 case IDMAP_TYPE_GROUP:
848 ret = nfs4_name_to_gid(im->im_name, &gid);
849 im->im_id = (u_int32_t) gid;
851 im->im_status = IDMAP_STATUS_LOOKUPFAIL;
852 im->im_id = nobodygid;
859 addfield(char **bpp, ssize_t *bsizp, char *fld)
862 ssize_t bsiz = *bsizp;
864 while ((ch = *fld++) != '\0' && bsiz > 0) {
871 bp += snprintf(bp, bsiz, "\\%03o", ch);
882 if (bsiz < 1 || ch != '\0')
895 getfield(char **bpp, char *fld, size_t fldsz)
900 while ((bp = strsep(bpp, " ")) != NULL && bp[0] == '\0')
903 if (bp == NULL || bp[0] == '\0' || bp[0] == '\n')
906 while (*bp != '\0' && fldsz > 1) {
908 if ((n = sscanf(bp, "\\%03o", &val)) != 1)
928 * mydaemon creates a pipe between the partent and child
929 * process. The parent process will wait until the
930 * child dies or writes a '1' on the pipe signaling
931 * that it started successfully.
933 int pipefds[2] = { -1, -1};
936 mydaemon(int nochdir, int noclose)
938 int pid, status, tempfd;
940 if (pipe(pipefds) < 0)
941 err(1, "mydaemon: pipe() failed: errno %d", errno);
943 if ((pid = fork ()) < 0)
944 err(1, "mydaemon: fork() failed: errno %d", errno);
948 * Parent. Wait for status from child.
951 if (read(pipefds[0], &status, 1) != 1)
959 if (chdir ("/") == -1)
960 err(1, "mydaemon: chdir() failed: errno %d", errno);
963 while (pipefds[1] <= 2) {
964 pipefds[1] = dup(pipefds[1]);
966 err(1, "mydaemon: dup() failed: errno %d", errno);
970 tempfd = open("/dev/null", O_RDWR);
972 tempfd = open("/", O_RDONLY);
979 err(1, "mydaemon: can't open /dev/null: errno %d",
992 if (pipefds[1] > 0) {
993 if (write(pipefds[1], &status, 1) != 1) {
994 err(1, "Writing to parent pipe failed: errno %d (%s)\n",
995 errno, strerror(errno));