/* Copyright 1988,1990,1993,1994 by Paul Vixie
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date. I can be reached as follows:
* Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
* From Id: database.c,v 2.8 1994/01/15 20:43:43 vixie Exp
#if !defined(lint) && !defined(LINT)
static char rcsid
[] = "$Header: $";
/* vix 26jan87 [RCS has the log]
#define TMAX(a,b) ((a)>(b)?(a):(b))
static void process_crontab
__P((char *, char *, char *,
struct stat syscron_stat
;
Debug(DLOAD
, ("[%d] load_database()\n", getpid()))
/* before we start loading any data, do a stat on SPOOL_DIR
* so that if anything changes as of this moment (i.e., before we've
* cached any of the database), we'll see the changes next time.
if (stat(SPOOL_DIR
, &statbuf
) < OK
) {
log_it("CRON", getpid(), "STAT FAILED", SPOOL_DIR
);
/* track system crontab file
if (stat(SYSCRONTAB
, &syscron_stat
) < OK
)
syscron_stat
.st_mtime
= 0;
/* if spooldir's mtime has not changed, we don't need to fiddle with
* Note that old_db->mtime is initialized to 0 in main(), and
* so is guaranteed to be different than the stat() mtime the first
* time this function is called.
if (old_db
->mtime
== TMAX(statbuf
.st_mtime
, syscron_stat
.st_mtime
)) {
Debug(DLOAD
, ("[%d] spool dir mtime unch, no load needed.\n",
/* something's different. make a new database, moving unchanged
* elements from the old database, reloading elements that have
* actually changed. Whatever is left in the old database when
* we're done is chaff -- crontabs that disappeared.
new_db
.mtime
= TMAX(statbuf
.st_mtime
, syscron_stat
.st_mtime
);
new_db
.head
= new_db
.tail
= NULL
;
if (syscron_stat
.st_mtime
) {
process_crontab("root", "*system*",
SYSCRONTAB
, &syscron_stat
,
/* we used to keep this dir open all the time, for the sake of
* efficiency. however, we need to close it in every fork, and
* we fork a lot more often than the mtime of the dir changes.
if (!(dir
= opendir(SPOOL_DIR
))) {
log_it("CRON", getpid(), "OPENDIR FAILED", SPOOL_DIR
);
while (NULL
!= (dp
= readdir(dir
))) {
/* avoid file names beginning with ".". this is good
* because we would otherwise waste two guaranteed calls
* to getpwnam() for . and .., and also because user names
* starting with a period are just too nasty to consider.
if (dp
->d_name
[0] == '.')
(void) strcpy(fname
, dp
->d_name
);
sprintf(tabname
, CRON_TAB(fname
));
process_crontab(fname
, fname
, tabname
,
&statbuf
, &new_db
, old_db
);
/* if we don't do this, then when our children eventually call
* getpwnam() in do_command.c's child_process to verify MAILTO=,
* they will screw us up (and v-v).
/* whatever's left in the old database is now junk.
Debug(DLOAD
, ("unlinking old database:\n"))
for (u
= old_db
->head
; u
!= NULL
; u
= nu
) {
Debug(DLOAD
, ("\t%s\n", u
->name
))
/* overwrite the database control block with the new one.
Debug(DLOAD
, ("load_database is done\n"))
for (u
= db
->head
; u
!= NULL
; u
= u
->next
)
if (!strcmp(u
->name
, name
))
process_crontab(uname
, fname
, tabname
, statbuf
, new_db
, old_db
)
struct passwd
*pw
= NULL
;
if (strcmp(fname
, "*system*") && !(pw
= getpwnam(uname
))) {
/* file doesn't have a user in passwd file.
log_it(fname
, getpid(), "ORPHAN", "no passwd entry");
if ((crontab_fd
= open(tabname
, O_RDONLY
, 0)) < OK
) {
/* crontab not accessible?
log_it(fname
, getpid(), "CAN'T OPEN", tabname
);
if (fstat(crontab_fd
, statbuf
) < OK
) {
log_it(fname
, getpid(), "FSTAT FAILED", tabname
);
Debug(DLOAD
, ("\t%s:", fname
))
u
= find_user(old_db
, fname
);
/* if crontab has not changed since we last read it
* in, then we can just use our existing entry.
if (u
->mtime
== statbuf
->st_mtime
) {
Debug(DLOAD
, (" [no change, using old data]"))
/* before we fall through to the code that will reload
* the user, let's deallocate and unlink the user in
* the old database. This is more a point of memory
* efficiency than anything else, since all leftover
* users will be deleted from the old database when
* we finish with the crontab...
Debug(DLOAD
, (" [delete old data]"))
log_it(fname
, getpid(), "RELOAD", tabname
);
u
= load_user(crontab_fd
, pw
, fname
);
u
->mtime
= statbuf
->st_mtime
;
Debug(DLOAD
, (" [done]\n"))