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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-03-15 19:50:46 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-03-15 19:50:46 +0000
commit5e892bae51a1f4414006a70f37d87b339e943cba (patch)
tree4a5dad014c464885001faaaa10dd0db4c50e67cd /sysklogd
parentbff32ce4d5a22fe7664f77c96f281fe3b02a9c75 (diff)
downloadbusybox-5e892bae51a1f4414006a70f37d87b339e943cba.tar.gz
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syslogd: reduce data/bss usage. Code size is practically the same.
Diffstat (limited to 'sysklogd')
-rw-r--r--sysklogd/syslogd.c293
1 files changed, 167 insertions, 126 deletions
diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c
index 53cb4ba5e..8ae75c974 100644
--- a/sysklogd/syslogd.c
+++ b/sysklogd/syslogd.c
@@ -17,46 +17,106 @@
#include <paths.h>
#include <sys/un.h>
-/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
+/* SYSLOG_NAMES defined to pull some extra junk from syslog.h: */
+/* prioritynames[] and facilitynames[]. uclibc pulls those in _rwdata_! :( */
+
#define SYSLOG_NAMES
#include <sys/syslog.h>
#include <sys/uio.h>
+#if ENABLE_FEATURE_REMOTE_LOG
+#include <netinet/in.h>
+#endif
+
+#if ENABLE_FEATURE_IPC_SYSLOG
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+#endif
+
+
#define DEBUG 0
-/* Path for the file where all log messages are written */
-static const char *logFilePath = "/var/log/messages";
-static int logFD = -1;
+// Semaphore operation structures
+struct shbuf_ds {
+ int32_t size; // size of data written
+ int32_t head; // start of message list
+ int32_t tail; // end of message list
+ char data[1]; // data/messages
+}; // shared memory pointer
+
+struct globals {
+
+ const char *logFilePath;
+ int logFD;
-/* This is not very useful, is bloat, and broken:
- * can deadlock if alarmed to make MARK while writing to IPC buffer
- * (semaphores are down but do_mark routine tries to down them again) */
+ /* This is not very useful, is bloat, and broken:
+ * can deadlock if alarmed to make MARK while writing to IPC buffer
+ * (semaphores are down but do_mark routine tries to down them again) */
#ifdef SYSLOGD_MARK
-/* interval between marks in seconds */
-static int markInterval = 20 * 60;
+ /* interval between marks in seconds */
+ int markInterval;
#endif
-/* level of messages to be locally logged */
-static int logLevel = 8;
-
-/* localhost's name */
-static char localHostName[64];
+ /* level of messages to be locally logged */
+ int logLevel;
#if ENABLE_FEATURE_ROTATE_LOGFILE
-/* max size of message file before being rotated */
-static unsigned logFileSize = 200 * 1024;
-/* number of rotated message files */
-static unsigned logFileRotate = 1;
-static unsigned curFileSize;
-static smallint isRegular;
+ /* max size of message file before being rotated */
+ unsigned logFileSize;
+ /* number of rotated message files */
+ unsigned logFileRotate;
+ unsigned curFileSize;
+ smallint isRegular;
#endif
#if ENABLE_FEATURE_REMOTE_LOG
-#include <netinet/in.h>
-/* udp socket for logging to remote host */
-static int remoteFD = -1;
-static len_and_sockaddr* remoteAddr;
+ /* udp socket for logging to remote host */
+ int remoteFD;
+ len_and_sockaddr* remoteAddr;
+#endif
+
+#if ENABLE_FEATURE_IPC_SYSLOG
+ int shmid; // ipc shared memory id
+ int s_semid; // ipc semaphore id
+ int shm_size;
+ struct sembuf SMwup[1];
+ struct sembuf SMwdn[3];
+ struct shbuf_ds *shbuf;
+#endif
+
+ time_t last_log_time;
+ /* localhost's name */
+ char localHostName[64];
+
+}; /* struct globals */
+
+static const struct globals init_globals = {
+ .logFilePath = "/var/log/messages",
+ .logFD = -1,
+#ifdef SYSLOGD_MARK
+ .markInterval = 20 * 60,
+#endif
+ .logLevel = 8,
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ .logFileSize = 200 * 1024,
+ .logFileRotate = 1,
+#endif
+#if ENABLE_FEATURE_REMOTE_LOG
+ .remoteFD = -1,
#endif
+#if ENABLE_FEATURE_IPC_SYSLOG
+ .shmid = -1,
+ .s_semid = -1,
+ .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
+ .SMwup = { {1, -1, IPC_NOWAIT} },
+ .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
+#endif
+ // FIXME: hidden tail with lotsa zeroes is here....
+};
+
+#define G (*ptr_to_globals)
+
/* We are using bb_common_bufsiz1 for buffering: */
enum { MAX_READ = (BUFSIZ/6) & ~0xf };
@@ -109,7 +169,7 @@ enum {
USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
USE_FEATURE_REMOTE_LOG( ,*opt_R) \
USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
-#define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
+#define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
USE_FEATURE_REMOTE_LOG( ,&opt_R) \
@@ -119,68 +179,51 @@ enum {
/* circular buffer variables/structures */
#if ENABLE_FEATURE_IPC_SYSLOG
-
#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
#error Sorry, you must set the syslogd buffer size to at least 4KB.
#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
#endif
-#include <sys/ipc.h>
-#include <sys/sem.h>
-#include <sys/shm.h>
-
/* our shared key */
#define KEY_ID ((long)0x414e4547) /* "GENA" */
-// Semaphore operation structures
-static struct shbuf_ds {
- int32_t size; // size of data written
- int32_t head; // start of message list
- int32_t tail; // end of message list
- char data[1]; // data/messages
-} *shbuf; // shared memory pointer
-
-static int shmid = -1; // ipc shared memory id
-static int s_semid = -1; // ipc semaphore id
-static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024); // default shm size
-
static void ipcsyslog_cleanup(void)
{
- if (shmid != -1) {
- shmdt(shbuf);
+ if (G.shmid != -1) {
+ shmdt(G.shbuf);
}
- if (shmid != -1) {
- shmctl(shmid, IPC_RMID, NULL);
+ if (G.shmid != -1) {
+ shmctl(G.shmid, IPC_RMID, NULL);
}
- if (s_semid != -1) {
- semctl(s_semid, 0, IPC_RMID, 0);
+ if (G.s_semid != -1) {
+ semctl(G.s_semid, 0, IPC_RMID, 0);
}
}
static void ipcsyslog_init(void)
{
if (DEBUG)
- printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
+ printf("shmget(%lx, %d,...)\n", KEY_ID, G.shm_size);
- shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
- if (shmid == -1) {
+ G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 1023);
+ if (G.shmid == -1) {
bb_perror_msg_and_die("shmget");
}
- shbuf = shmat(shmid, NULL, 0);
- if (!shbuf) {
+ G.shbuf = shmat(G.shmid, NULL, 0);
+ if (!G.shbuf) {
bb_perror_msg_and_die("shmat");
}
- shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
- shbuf->head = shbuf->tail = 0;
+ G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data);
+ G.shbuf->head = G.shbuf->tail = 0;
// we'll trust the OS to set initial semval to 0 (let's hope)
- s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
- if (s_semid == -1) {
+ G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
+ if (G.s_semid == -1) {
if (errno == EEXIST) {
- s_semid = semget(KEY_ID, 2, 0);
- if (s_semid != -1)
+ G.s_semid = semget(KEY_ID, 2, 0);
+ if (G.s_semid != -1)
return;
}
bb_perror_msg_and_die("semget");
@@ -190,14 +233,10 @@ static void ipcsyslog_init(void)
/* Write message to shared mem buffer */
static void log_to_shmem(const char *msg, int len)
{
- /* Why libc insists on these being rw? */
- static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
- static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
-
int old_tail, new_tail;
char *c;
- if (semop(s_semid, SMwdn, 3) == -1) {
+ if (semop(G.s_semid, G.SMwdn, 3) == -1) {
bb_perror_msg_and_die("SMwdn");
}
@@ -212,53 +251,53 @@ static void log_to_shmem(const char *msg, int len)
*/
len++; /* length with NUL included */
again:
- old_tail = shbuf->tail;
+ old_tail = G.shbuf->tail;
new_tail = old_tail + len;
- if (new_tail < shbuf->size) {
+ if (new_tail < G.shbuf->size) {
/* No need to move head if shbuf->head <= old_tail,
* else... */
- if (old_tail < shbuf->head && shbuf->head <= new_tail) {
+ if (old_tail < G.shbuf->head && G.shbuf->head <= new_tail) {
/* ...need to move head forward */
- c = memchr(shbuf->data + new_tail, '\0',
- shbuf->size - new_tail);
+ c = memchr(G.shbuf->data + new_tail, '\0',
+ G.shbuf->size - new_tail);
if (!c) /* no NUL ahead of us, wrap around */
- c = memchr(shbuf->data, '\0', old_tail);
+ c = memchr(G.shbuf->data, '\0', old_tail);
if (!c) { /* still nothing? point to this msg... */
- shbuf->head = old_tail;
+ G.shbuf->head = old_tail;
} else {
/* convert pointer to offset + skip NUL */
- shbuf->head = c - shbuf->data + 1;
+ G.shbuf->head = c - G.shbuf->data + 1;
}
}
/* store message, set new tail */
- memcpy(shbuf->data + old_tail, msg, len);
- shbuf->tail = new_tail;
+ memcpy(G.shbuf->data + old_tail, msg, len);
+ G.shbuf->tail = new_tail;
} else {
/* we need to break up the message and wrap it around */
/* k == available buffer space ahead of old tail */
- int k = shbuf->size - old_tail - 1;
- if (shbuf->head > old_tail) {
+ int k = G.shbuf->size - old_tail - 1;
+ if (G.shbuf->head > old_tail) {
/* we are going to overwrite head, need to
* move it out of the way */
- c = memchr(shbuf->data, '\0', old_tail);
+ c = memchr(G.shbuf->data, '\0', old_tail);
if (!c) { /* nothing? point to this msg... */
- shbuf->head = old_tail;
+ G.shbuf->head = old_tail;
} else { /* convert pointer to offset + skip NUL */
- shbuf->head = c - shbuf->data + 1;
+ G.shbuf->head = c - G.shbuf->data + 1;
}
}
/* copy what fits to the end of buffer, and repeat */
- memcpy(shbuf->data + old_tail, msg, k);
+ memcpy(G.shbuf->data + old_tail, msg, k);
msg += k;
len -= k;
- shbuf->tail = 0;
+ G.shbuf->tail = 0;
goto again;
}
- if (semop(s_semid, SMwup, 1) == -1) {
+ if (semop(G.s_semid, G.SMwup, 1) == -1) {
bb_perror_msg_and_die("SMwup");
}
if (DEBUG)
- printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
+ printf("head:%d tail:%d\n", G.shbuf->head, G.shbuf->tail);
}
#else
void ipcsyslog_cleanup(void);
@@ -270,29 +309,28 @@ void log_to_shmem(const char *msg);
/* Print a message to the log file. */
static void log_locally(char *msg)
{
- static time_t last;
struct flock fl;
int len = strlen(msg);
#if ENABLE_FEATURE_IPC_SYSLOG
- if ((option_mask32 & OPT_circularlog) && shbuf) {
+ if ((option_mask32 & OPT_circularlog) && G.shbuf) {
log_to_shmem(msg, len);
return;
}
#endif
- if (logFD >= 0) {
+ if (G.logFD >= 0) {
time_t cur;
time(&cur);
- if (last != cur) {
- last = cur; /* reopen log file every second */
- close(logFD);
+ if (G.last_log_time != cur) {
+ G.last_log_time = cur; /* reopen log file every second */
+ close(G.logFD);
goto reopen;
}
} else {
reopen:
- logFD = device_open(logFilePath, O_WRONLY | O_CREAT
+ G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
| O_NOCTTY | O_APPEND | O_NONBLOCK);
- if (logFD < 0) {
+ if (G.logFD < 0) {
/* cannot open logfile? - print to /dev/console then */
int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
if (fd < 0)
@@ -306,9 +344,9 @@ static void log_locally(char *msg)
{
struct stat statf;
- isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
+ G.isRegular = (fstat(G.logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
/* bug (mostly harmless): can wrap around if file > 4gb */
- curFileSize = statf.st_size;
+ G.curFileSize = statf.st_size;
}
#endif
}
@@ -317,36 +355,36 @@ static void log_locally(char *msg)
fl.l_start = 0;
fl.l_len = 1;
fl.l_type = F_WRLCK;
- fcntl(logFD, F_SETLKW, &fl);
+ fcntl(G.logFD, F_SETLKW, &fl);
#if ENABLE_FEATURE_ROTATE_LOGFILE
- if (logFileSize && isRegular && curFileSize > logFileSize) {
- if (logFileRotate) { /* always 0..99 */
- int i = strlen(logFilePath) + 3 + 1;
+ if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
+ if (G.logFileRotate) { /* always 0..99 */
+ int i = strlen(G.logFilePath) + 3 + 1;
char oldFile[i];
char newFile[i];
- i = logFileRotate - 1;
+ i = G.logFileRotate - 1;
/* rename: f.8 -> f.9; f.7 -> f.8; ... */
while (1) {
- sprintf(newFile, "%s.%d", logFilePath, i);
+ sprintf(newFile, "%s.%d", G.logFilePath, i);
if (i == 0) break;
- sprintf(oldFile, "%s.%d", logFilePath, --i);
+ sprintf(oldFile, "%s.%d", G.logFilePath, --i);
rename(oldFile, newFile);
}
/* newFile == "f.0" now */
- rename(logFilePath, newFile);
+ rename(G.logFilePath, newFile);
fl.l_type = F_UNLCK;
- fcntl(logFD, F_SETLKW, &fl);
- close(logFD);
+ fcntl(G.logFD, F_SETLKW, &fl);
+ close(G.logFD);
goto reopen;
}
- ftruncate(logFD, 0);
+ ftruncate(G.logFD, 0);
}
- curFileSize +=
+ G.curFileSize +=
#endif
- full_write(logFD, msg, len);
+ full_write(G.logFD, msg, len);
fl.l_type = F_UNLCK;
- fcntl(logFD, F_SETLKW, &fl);
+ fcntl(G.logFD, F_SETLKW, &fl);
}
static void parse_fac_prio_20(int pri, char *res20)
@@ -397,13 +435,13 @@ static void timestamp_and_log(int pri, char *msg, int len)
/* Log message locally (to file or shared mem) */
if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
- if (LOG_PRI(pri) < logLevel) {
+ if (LOG_PRI(pri) < G.logLevel) {
if (option_mask32 & OPT_small)
sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
else {
char res[20];
parse_fac_prio_20(pri, res);
- sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
+ sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
}
log_locally(PRINTBUF);
}
@@ -456,9 +494,9 @@ static void quit_signal(int sig)
#ifdef SYSLOGD_MARK
static void do_mark(int sig)
{
- if (markInterval) {
+ if (G.markInterval) {
timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
- alarm(markInterval);
+ alarm(G.markInterval);
}
}
#endif
@@ -482,7 +520,7 @@ static void do_syslogd(void)
#endif
#ifdef SYSLOGD_MARK
signal(SIGALRM, do_mark);
- alarm(markInterval);
+ alarm(G.markInterval);
#endif
memset(&sunx, 0, sizeof(sunx));
@@ -541,14 +579,14 @@ static void do_syslogd(void)
#if ENABLE_FEATURE_REMOTE_LOG
/* We are not modifying log messages in any way before send */
/* Remote site cannot trust _us_ anyway and need to do validation again */
- if (remoteAddr) {
- if (-1 == remoteFD) {
- remoteFD = socket(remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
+ if (G.remoteAddr) {
+ if (-1 == G.remoteFD) {
+ G.remoteFD = socket(G.remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
}
- if (-1 != remoteFD) {
+ if (-1 != G.remoteFD) {
/* send message to remote logger, ignore possible error */
- sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
- &remoteAddr->sa, remoteAddr->len);
+ sendto(G.remoteFD, RECVBUF, i, MSG_DONTWAIT,
+ &G.remoteAddr->sa, G.remoteAddr->len);
}
}
#endif
@@ -564,33 +602,36 @@ int syslogd_main(int argc, char **argv)
char OPTION_DECL;
char *p;
+ PTR_TO_GLOBALS = xzalloc(sizeof(G));
+ memcpy(ptr_to_globals, &init_globals, sizeof(init_globals));
+
/* do normal option parsing */
opt_complementary = "=0"; /* no non-option params */
getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
#ifdef SYSLOGD_MARK
if (option_mask32 & OPT_mark) // -m
- markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
+ 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
- logLevel = xatou_range(opt_l, 1, 8);
+ G.logLevel = xatou_range(opt_l, 1, 8);
//if (option_mask32 & OPT_small) // -S
#if ENABLE_FEATURE_ROTATE_LOGFILE
if (option_mask32 & OPT_filesize) // -s
- 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
- logFileRotate = xatou_range(opt_b, 0, 99);
+ G.logFileRotate = xatou_range(opt_b, 0, 99);
#endif
#if ENABLE_FEATURE_REMOTE_LOG
if (option_mask32 & OPT_remotelog) { // -R
- remoteAddr = xhost2sockaddr(opt_R, 514);
+ G.remoteAddr = xhost2sockaddr(opt_R, 514);
}
//if (option_mask32 & OPT_locallog) // -L
#endif
#if ENABLE_FEATURE_IPC_SYSLOG
if (opt_C) // -Cn
- shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
+ G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
#endif
/* If they have not specified remote logging, then log locally */
@@ -598,8 +639,8 @@ int syslogd_main(int argc, char **argv)
option_mask32 |= OPT_locallog;
/* Store away localhost's name before the fork */
- gethostname(localHostName, sizeof(localHostName));
- p = strchr(localHostName, '.');
+ gethostname(G.localHostName, sizeof(G.localHostName));
+ p = strchr(G.localHostName, '.');
if (p) {
*p = '\0';
}