[git commit master 1/1] crond: check mtime on crontab dir every minute, and reread if changed
Denys Vlasenko
vda.linux at googlemail.com
Thu Jul 8 02:07:54 UTC 2010
commit: http://git.busybox.net/busybox/commit/?id=dfc870fab711b3ee85341f8cd8e7c8e0799d2da7
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
function old new delta
crond_main 1417 1460 +43
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
miscutils/crond.c | 75 +++++++++++++++++++++++++---------------------------
1 files changed, 36 insertions(+), 39 deletions(-)
diff --git a/miscutils/crond.c b/miscutils/crond.c
index 06d72ce..481830f 100644
--- a/miscutils/crond.c
+++ b/miscutils/crond.c
@@ -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 {
--
1.7.1
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