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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-12-09 22:53:31 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-12-09 22:53:31 +0000
commit0d94820adf87b752c338c194a7291dcf1b96fc76 (patch)
tree59d71afa998d643835a2b8eba6fd72ddf78cc46a
parent1bcdcd2ef0c1fda6b197ead493f9413f0d2ecfc2 (diff)
downloadbusybox-0d94820adf87b752c338c194a7291dcf1b96fc76.tar.gz
busybox-0d94820adf87b752c338c194a7291dcf1b96fc76.tar.bz2
syslogd: comment out file locking;
make signal handling syncronous (old was racy) function old new delta syslogd_main 963 1090 +127 quit_signal 96 - -96 log_locally 743 595 -148 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 1/1 up/down: 127/-244) Total: -117 bytes
-rw-r--r--sysklogd/syslogd.c79
1 files changed, 46 insertions, 33 deletions
diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c
index 38ea3d7ff..48b875ef1 100644
--- a/sysklogd/syslogd.c
+++ b/sysklogd/syslogd.c
@@ -43,6 +43,9 @@
* (semaphores are down but do_mark routine tries to down them again) */
#undef SYSLOGD_MARK
+/* Write locking does not seem to be useful either */
+#undef SYSLOGD_WRLOCK
+
enum {
MAX_READ = 256,
DNS_WAIT_SEC = 2 * 60,
@@ -152,7 +155,7 @@ enum {
OPTBIT_small, // -S
USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
- USE_FEATURE_REMOTE_LOG( OPTBIT_remote ,) // -R
+ USE_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
USE_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
USE_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
@@ -164,7 +167,7 @@ enum {
OPT_small = 1 << OPTBIT_small ,
OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
OPT_rotatecnt = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
- OPT_remotelog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_remote )) + 0,
+ OPT_remotelog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
OPT_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
OPT_dup = USE_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
@@ -291,7 +294,9 @@ void log_to_shmem(const char *msg);
/* Print a message to the log file. */
static void log_locally(time_t now, char *msg)
{
+#ifdef SYSLOGD_WRLOCK
struct flock fl;
+#endif
int len = strlen(msg);
#if ENABLE_FEATURE_IPC_SYSLOG
@@ -332,11 +337,13 @@ static void log_locally(time_t now, char *msg)
#endif
}
+#ifdef SYSLOGD_WRLOCK
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 1;
fl.l_type = F_WRLCK;
fcntl(G.logFD, F_SETLKW, &fl);
+#endif
#if ENABLE_FEATURE_ROTATE_LOGFILE
if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
@@ -355,8 +362,10 @@ static void log_locally(time_t now, char *msg)
}
/* newFile == "f.0" now */
rename(G.logFilePath, newFile);
+#ifdef SYSLOGD_WRLOCK
fl.l_type = F_UNLCK;
fcntl(G.logFD, F_SETLKW, &fl);
+#endif
close(G.logFD);
goto reopen;
}
@@ -365,8 +374,10 @@ static void log_locally(time_t now, char *msg)
G.curFileSize +=
#endif
full_write(G.logFD, msg, len);
+#ifdef SYSLOGD_WRLOCK
fl.l_type = F_UNLCK;
fcntl(G.logFD, F_SETLKW, &fl);
+#endif
}
static void parse_fac_prio_20(int pri, char *res20)
@@ -432,6 +443,7 @@ static void timestamp_and_log(int pri, char *msg, int len)
static void timestamp_and_log_internal(const char *msg)
{
+ /* -L, or no -R */
if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
return;
timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
@@ -476,15 +488,6 @@ static void split_escape_and_log(char *tmpbuf, int len)
}
}
-static void quit_signal(int sig)
-{
- timestamp_and_log_internal("syslogd exiting");
- puts("syslogd exiting");
- if (ENABLE_FEATURE_IPC_SYSLOG)
- ipcsyslog_cleanup();
- kill_myself_with_sig(sig);
-}
-
#ifdef SYSLOGD_MARK
static void do_mark(int sig)
{
@@ -553,14 +556,11 @@ static void do_syslogd(void)
#define recvbuf (G.recvbuf)
#endif
- /* Set up signal handlers */
- bb_signals(0
- + (1 << SIGINT)
- + (1 << SIGTERM)
- + (1 << SIGQUIT)
- , quit_signal);
+ /* Set up signal handlers (so that they interrupt read()) */
+ signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
+ signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
+ //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
signal(SIGHUP, SIG_IGN);
- /* signal(SIGCHLD, SIG_IGN); - why? */
#ifdef SYSLOGD_MARK
signal(SIGALRM, do_mark);
alarm(G.markInterval);
@@ -573,7 +573,7 @@ static void do_syslogd(void)
timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
- for (;;) {
+ while (!bb_got_signal) {
ssize_t sz;
#if ENABLE_FEATURE_SYSLOGD_DUP
@@ -584,9 +584,12 @@ static void do_syslogd(void)
recvbuf = G.recvbuf;
#endif
read_again:
- sz = safe_read(sock_fd, recvbuf, MAX_READ - 1);
- if (sz < 0)
- bb_perror_msg_and_die("read from /dev/log");
+ sz = read(sock_fd, recvbuf, MAX_READ - 1);
+ if (sz < 0) {
+ if (!bb_got_signal)
+ bb_perror_msg("read from /dev/log");
+ break;
+ }
/* Drop trailing '\n' and NULs (typically there is one NUL) */
while (1) {
@@ -633,7 +636,13 @@ static void do_syslogd(void)
recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
split_escape_and_log(recvbuf, sz);
}
- } /* for (;;) */
+ } /* while (!bb_got_signal) */
+
+ timestamp_and_log_internal("syslogd exiting");
+ puts("syslogd exiting");
+ if (ENABLE_FEATURE_IPC_SYSLOG)
+ ipcsyslog_cleanup();
+ kill_myself_with_sig(bb_got_signal);
#undef recvbuf
}
@@ -641,6 +650,7 @@ int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int syslogd_main(int argc UNUSED_PARAM, char **argv)
{
char OPTION_DECL;
+ int opts;
INIT_G();
#if ENABLE_FEATURE_REMOTE_LOG
@@ -649,20 +659,20 @@ int syslogd_main(int argc UNUSED_PARAM, char **argv)
/* do normal option parsing */
opt_complementary = "=0"; /* no non-option params */
- getopt32(argv, OPTION_STR, OPTION_PARAM);
+ opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
#ifdef SYSLOGD_MARK
- if (option_mask32 & OPT_mark) // -m
+ if (opts & OPT_mark) // -m
G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
#endif
- //if (option_mask32 & OPT_nofork) // -n
- //if (option_mask32 & OPT_outfile) // -O
- if (option_mask32 & OPT_loglevel) // -l
+ //if (opts & OPT_nofork) // -n
+ //if (opts & OPT_outfile) // -O
+ if (opts & OPT_loglevel) // -l
G.logLevel = xatou_range(opt_l, 1, 8);
- //if (option_mask32 & OPT_small) // -S
+ //if (opts & OPT_small) // -S
#if ENABLE_FEATURE_ROTATE_LOGFILE
- if (option_mask32 & OPT_filesize) // -s
+ if (opts & OPT_filesize) // -s
G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
- if (option_mask32 & OPT_rotatecnt) // -b
+ if (opts & OPT_rotatecnt) // -b
G.logFileRotate = xatou_range(opt_b, 0, 99);
#endif
#if ENABLE_FEATURE_IPC_SYSLOG
@@ -671,14 +681,14 @@ int syslogd_main(int argc UNUSED_PARAM, char **argv)
#endif
/* If they have not specified remote logging, then log locally */
- if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
+ if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
option_mask32 |= OPT_locallog;
/* Store away localhost's name before the fork */
G.hostname = safe_gethostname();
*strchrnul(G.hostname, '.') = '\0';
- if (!(option_mask32 & OPT_nofork)) {
+ if (!(opts & OPT_nofork)) {
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
}
umask(0);
@@ -688,6 +698,9 @@ int syslogd_main(int argc UNUSED_PARAM, char **argv)
}
/* Clean up. Needed because we are included from syslogd_and_logger.c */
+#undef DEBUG
+#undef SYSLOGD_MARK
+#undef SYSLOGD_WRLOCK
#undef G
#undef GLOBALS
#undef INIT_G