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crond: check mtime on crontab dir every minute, and reread if changed

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function                                             old     new   delta
crond_main                                          1417    1460     +43

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-07-08 04:07:54 +02:00
parent 4a09aefae2
commit dfc870fab7
1 changed files with 36 additions and 39 deletions
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75
miscutils/crond.c
View File

@@ -87,6 +87,7 @@ enum {
struct globals {
unsigned LogLevel; /* = 8; */
time_t CDir_mtime;
const char *LogFile;
const char *CDir; /* = CRONTABS; */
CronFile *FileBase;
@@ -96,15 +97,9 @@ struct globals {
#endif
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define LogLevel (G.LogLevel )
#define LogFile (G.LogFile )
#define CDir (G.CDir )
#define FileBase (G.FileBase )
#define env_var_user (G.env_var_user )
#define env_var_home (G.env_var_home )
#define INIT_G() do { \
LogLevel = 8; \
CDir = CRONTABS; \
G.LogLevel = 8; \
G.CDir = CRONTABS; \
} while (0)
@@ -124,12 +119,12 @@ static void crondlog(const char *ctl, ...)
int level = (ctl[0] & 0x1f);
va_start(va, ctl);
if (level >= (int)LogLevel) {
if (level >= (int)G.LogLevel) {
/* Debug mode: all to (non-redirected) stderr, */
/* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
if (!DebugOpt && LogFile) {
if (!DebugOpt && G.LogFile) {
/* Otherwise (log to file): we reopen log file at every write: */
int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0666);
int logfd = open3_or_warn(G.LogFile, O_WRONLY | O_CREAT | O_APPEND, 0666);
if (logfd >= 0)
xmove_fd(logfd, STDERR_FILENO);
}
@@ -168,10 +163,10 @@ static void safe_setenv(char **pvar_val, const char *var, const char *val)
static void SetEnv(struct passwd *pas)
{
#if SETENV_LEAKS
safe_setenv(&env_var_user, "USER", pas->pw_name);
safe_setenv(&env_var_home, "HOME", pas->pw_dir);
safe_setenv(&G.env_var_user, "USER", pas->pw_name);
safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
/* if we want to set user's shell instead: */
/*safe_setenv(env_var_shell, "SHELL", pas->pw_shell);*/
/*safe_setenv(G.env_var_shell, "SHELL", pas->pw_shell);*/
#else
xsetenv("USER", pas->pw_name);
xsetenv("HOME", pas->pw_dir);
@@ -308,7 +303,7 @@ static void ParseField(char *user, char *ary, int modvalue, int off,
return;
}
if (DebugOpt && (LogLevel <= 5)) { /* like LVL5 */
if (DebugOpt && (G.LogLevel <= 5)) { /* like LVL5 */
/* can't use crondlog, it inserts '\n' */
int i;
for (i = 0; i < modvalue; ++i)
@@ -351,7 +346,7 @@ static void FixDayDow(CronLine *line)
*/
static void DeleteFile(const char *userName)
{
CronFile **pfile = &FileBase;
CronFile **pfile = &G.FileBase;
CronFile *file;
while ((file = *pfile) != NULL) {
@@ -462,8 +457,8 @@ static void SynchronizeFile(const char *fileName)
}
*pline = NULL;
file->cf_Next = FileBase;
FileBase = file;
file->cf_Next = G.FileBase;
G.FileBase = file;
if (maxLines == 0) {
crondlog(WARN9 "user %s: too many lines", fileName);
@@ -493,7 +488,7 @@ static void SynchronizeDir(void)
CronFile *file;
/* Attempt to delete the database. */
again:
for (file = FileBase; file; file = file->cf_Next) {
for (file = G.FileBase; file; file = file->cf_Next) {
if (!file->cf_Deleted) {
DeleteFile(file->cf_User);
goto again;
@@ -509,8 +504,8 @@ static void SynchronizeDir(void)
* scan directory and add associated users
*/
unlink(CRONUPDATE);
if (chdir(CDir) < 0) {
crondlog(DIE9 "chdir(%s)", CDir);
if (chdir(G.CDir) < 0) {
crondlog(DIE9 "chdir(%s)", G.CDir);
}
{
DIR *dir = opendir(".");
@@ -537,9 +532,8 @@ static void SynchronizeDir(void)
* period is about a minute (one scan). Worst case it will be one
* hour (60 scans).
*/
static int TestJobs(time_t t1, time_t t2)
static void TestJobs(time_t t1, time_t t2)
{
int nJobs = 0;
time_t t;
/* Find jobs > t1 and <= t2 */
@@ -553,7 +547,7 @@ static int TestJobs(time_t t1, time_t t2)
continue;
ptm = localtime(&t);
for (file = FileBase; file; file = file->cf_Next) {
for (file = G.FileBase; file; file = file->cf_Next) {
if (DebugOpt)
crondlog(LVL5 "file %s:", file->cf_User);
if (file->cf_Deleted)
@@ -575,13 +569,11 @@ static int TestJobs(time_t t1, time_t t2)
} else if (line->cl_Pid == 0) {
line->cl_Pid = -1;
file->cf_Ready = 1;
++nJobs;
}
}
}
}
}
return nJobs;
}
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
@@ -650,7 +642,7 @@ static int CheckJobs(void)
CronLine *line;
int nStillRunning = 0;
for (file = FileBase; file; file = file->cf_Next) {
for (file = G.FileBase; file; file = file->cf_Next) {
if (file->cf_Running) {
file->cf_Running = 0;
@@ -819,7 +811,7 @@ static void RunJobs(void)
CronFile *file;
CronLine *line;
for (file = FileBase; file; file = file->cf_Next) {
for (file = G.FileBase; file; file = file->cf_Next) {
if (!file->cf_Ready)
continue;
@@ -854,9 +846,9 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
":l+:d+"; /* -l and -d have numeric param */
opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
&LogLevel, &LogFile, &CDir
IF_FEATURE_CROND_D(,&LogLevel));
/* both -d N and -l N set the same variable: LogLevel */
&G.LogLevel, &G.LogFile, &G.CDir
IF_FEATURE_CROND_D(,&G.LogLevel));
/* both -d N and -l N set the same variable: G.LogLevel */
if (!(opts & OPT_f)) {
/* close stdin, stdout, stderr.
@@ -864,30 +856,32 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
}
if (!(opts & OPT_d) && LogFile == NULL) {
if (!(opts & OPT_d) && G.LogFile == NULL) {
/* logging to syslog */
openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
logmode = LOGMODE_SYSLOG;
}
xchdir(CDir);
xchdir(G.CDir);
//signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
xsetenv("SHELL", DEFAULT_SHELL); /* once, for all future children */
crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", LogLevel);
crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", G.LogLevel);
SynchronizeDir();
write_pidfile("/var/run/crond.pid");
/* main loop - synchronize to 1 second after the minute, minimum sleep
* of 1 second. */
/* Main loop */
t2 = time(NULL);
rescan = 60;
sleep_time = 60;
for (;;) {
struct stat sbuf;
time_t t1;
long dt;
t1 = t2;
sleep((sleep_time + 1) - (time(NULL) % sleep_time));
/* Synchronize to 1 minute, minimum 1 second */
sleep(sleep_time - (time(NULL) % sleep_time) + 1);
t2 = time(NULL);
dt = (long)t2 - (long)t1;
@@ -908,6 +902,10 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
* When running jobs, the inequality used is greater but not
* equal to t1, and less then or equal to t2.
*/
if (stat(G.CDir, &sbuf) == 0 && G.CDir_mtime != sbuf.st_mtime) {
G.CDir_mtime = sbuf.st_mtime;
rescan = 1;
}
if (--rescan == 0) {
rescan = 60;
SynchronizeDir();
@@ -919,10 +917,9 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
crondlog(WARN9 "time disparity of %ld minutes detected", dt / 60);
/* and we do not run any jobs in this case */
} else if (dt > 0) {
/* Usual case: time advances forwad, as expected */
/* Usual case: time advances forward, as expected */
TestJobs(t1, t2);
RunJobs();
sleep(5);
if (CheckJobs() > 0) {
sleep_time = 10;
} else {