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syslogd: comment out file locking;

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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
This commit is contained in:
Denis Vlasenko 2008-12-09 22:53:31 +00:00
parent 1bcdcd2ef0
commit 0d94820adf
1 changed files with 46 additions and 33 deletions
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79
sysklogd/syslogd.c
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@ -43,6 +43,9 @@
* (semaphores are down but do_mark routine tries to down them again) */ * (semaphores are down but do_mark routine tries to down them again) */
#undef SYSLOGD_MARK #undef SYSLOGD_MARK
/* Write locking does not seem to be useful either */
#undef SYSLOGD_WRLOCK
enum { enum {
MAX_READ = 256, MAX_READ = 256,
DNS_WAIT_SEC = 2 * 60, DNS_WAIT_SEC = 2 * 60,
@ -152,7 +155,7 @@ enum {
OPTBIT_small, // -S OPTBIT_small, // -S
USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b 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_REMOTE_LOG( OPTBIT_locallog ,) // -L
USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
USE_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D USE_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
@ -164,7 +167,7 @@ enum {
OPT_small = 1 << OPTBIT_small , OPT_small = 1 << OPTBIT_small ,
OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0, OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
OPT_rotatecnt = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 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_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0, OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
OPT_dup = USE_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 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. */ /* Print a message to the log file. */
static void log_locally(time_t now, char *msg) static void log_locally(time_t now, char *msg)
{ {
#ifdef SYSLOGD_WRLOCK
struct flock fl; struct flock fl;
#endif
int len = strlen(msg); int len = strlen(msg);
#if ENABLE_FEATURE_IPC_SYSLOG #if ENABLE_FEATURE_IPC_SYSLOG
@ -332,11 +337,13 @@ static void log_locally(time_t now, char *msg)
#endif #endif
} }
#ifdef SYSLOGD_WRLOCK
fl.l_whence = SEEK_SET; fl.l_whence = SEEK_SET;
fl.l_start = 0; fl.l_start = 0;
fl.l_len = 1; fl.l_len = 1;
fl.l_type = F_WRLCK; fl.l_type = F_WRLCK;
fcntl(G.logFD, F_SETLKW, &fl); fcntl(G.logFD, F_SETLKW, &fl);
#endif
#if ENABLE_FEATURE_ROTATE_LOGFILE #if ENABLE_FEATURE_ROTATE_LOGFILE
if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) { 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 */ /* newFile == "f.0" now */
rename(G.logFilePath, newFile); rename(G.logFilePath, newFile);
#ifdef SYSLOGD_WRLOCK
fl.l_type = F_UNLCK; fl.l_type = F_UNLCK;
fcntl(G.logFD, F_SETLKW, &fl); fcntl(G.logFD, F_SETLKW, &fl);
#endif
close(G.logFD); close(G.logFD);
goto reopen; goto reopen;
} }
@ -365,8 +374,10 @@ static void log_locally(time_t now, char *msg)
G.curFileSize += G.curFileSize +=
#endif #endif
full_write(G.logFD, msg, len); full_write(G.logFD, msg, len);
#ifdef SYSLOGD_WRLOCK
fl.l_type = F_UNLCK; fl.l_type = F_UNLCK;
fcntl(G.logFD, F_SETLKW, &fl); fcntl(G.logFD, F_SETLKW, &fl);
#endif
} }
static void parse_fac_prio_20(int pri, char *res20) 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) static void timestamp_and_log_internal(const char *msg)
{ {
/* -L, or no -R */
if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog)) if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
return; return;
timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0); 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 #ifdef SYSLOGD_MARK
static void do_mark(int sig) static void do_mark(int sig)
{ {
@ -553,14 +556,11 @@ static void do_syslogd(void)
#define recvbuf (G.recvbuf) #define recvbuf (G.recvbuf)
#endif #endif
/* Set up signal handlers */ /* Set up signal handlers (so that they interrupt read()) */
bb_signals(0 signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
+ (1 << SIGINT) signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
+ (1 << SIGTERM) //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
+ (1 << SIGQUIT)
, quit_signal);
signal(SIGHUP, SIG_IGN); signal(SIGHUP, SIG_IGN);
/* signal(SIGCHLD, SIG_IGN); - why? */
#ifdef SYSLOGD_MARK #ifdef SYSLOGD_MARK
signal(SIGALRM, do_mark); signal(SIGALRM, do_mark);
alarm(G.markInterval); alarm(G.markInterval);
@ -573,7 +573,7 @@ static void do_syslogd(void)
timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER); timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
for (;;) { while (!bb_got_signal) {
ssize_t sz; ssize_t sz;
#if ENABLE_FEATURE_SYSLOGD_DUP #if ENABLE_FEATURE_SYSLOGD_DUP
@ -584,9 +584,12 @@ static void do_syslogd(void)
recvbuf = G.recvbuf; recvbuf = G.recvbuf;
#endif #endif
read_again: read_again:
sz = safe_read(sock_fd, recvbuf, MAX_READ - 1); sz = read(sock_fd, recvbuf, MAX_READ - 1);
if (sz < 0) if (sz < 0) {
bb_perror_msg_and_die("read from /dev/log"); if (!bb_got_signal)
bb_perror_msg("read from /dev/log");
break;
}
/* Drop trailing '\n' and NULs (typically there is one NUL) */ /* Drop trailing '\n' and NULs (typically there is one NUL) */
while (1) { while (1) {
@ -633,7 +636,13 @@ static void do_syslogd(void)
recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */ recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
split_escape_and_log(recvbuf, sz); 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 #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) int syslogd_main(int argc UNUSED_PARAM, char **argv)
{ {
char OPTION_DECL; char OPTION_DECL;
int opts;
INIT_G(); INIT_G();
#if ENABLE_FEATURE_REMOTE_LOG #if ENABLE_FEATURE_REMOTE_LOG
@ -649,20 +659,20 @@ int syslogd_main(int argc UNUSED_PARAM, char **argv)
/* do normal option parsing */ /* do normal option parsing */
opt_complementary = "=0"; /* no non-option params */ opt_complementary = "=0"; /* no non-option params */
getopt32(argv, OPTION_STR, OPTION_PARAM); opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
#ifdef SYSLOGD_MARK #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; G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
#endif #endif
//if (option_mask32 & OPT_nofork) // -n //if (opts & OPT_nofork) // -n
//if (option_mask32 & OPT_outfile) // -O //if (opts & OPT_outfile) // -O
if (option_mask32 & OPT_loglevel) // -l if (opts & OPT_loglevel) // -l
G.logLevel = xatou_range(opt_l, 1, 8); 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 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; 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); G.logFileRotate = xatou_range(opt_b, 0, 99);
#endif #endif
#if ENABLE_FEATURE_IPC_SYSLOG #if ENABLE_FEATURE_IPC_SYSLOG
@ -671,14 +681,14 @@ int syslogd_main(int argc UNUSED_PARAM, char **argv)
#endif #endif
/* If they have not specified remote logging, then log locally */ /* 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; option_mask32 |= OPT_locallog;
/* Store away localhost's name before the fork */ /* Store away localhost's name before the fork */
G.hostname = safe_gethostname(); G.hostname = safe_gethostname();
*strchrnul(G.hostname, '.') = '\0'; *strchrnul(G.hostname, '.') = '\0';
if (!(option_mask32 & OPT_nofork)) { if (!(opts & OPT_nofork)) {
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv); bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
} }
umask(0); 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 */ /* Clean up. Needed because we are included from syslogd_and_logger.c */
#undef DEBUG
#undef SYSLOGD_MARK
#undef SYSLOGD_WRLOCK
#undef G #undef G
#undef GLOBALS #undef GLOBALS
#undef INIT_G #undef INIT_G