diff options
Diffstat (limited to 'sysklogd')
| -rw-r--r-- | sysklogd/Config.in | 19 | ||||
| -rw-r--r-- | sysklogd/logread.c | 7 | ||||
| -rw-r--r-- | sysklogd/syslogd.c | 14 |
3 files changed, 32 insertions, 8 deletions
diff --git a/sysklogd/Config.in b/sysklogd/Config.in index cb2ee0865..a671f59f1 100644 --- a/sysklogd/Config.in +++ b/sysklogd/Config.in @@ -56,6 +56,14 @@ config CONFIG_FEATURE_IPC_SYSLOG entire filesystem, which may cause your system to break badly. +config CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE + int " Circular buffer size in Kbytes (minimum 4KB)" + default 16 + depends on CONFIG_FEATURE_IPC_SYSLOG + help + This option sets the size of the circular buffer + used to record system log messages. + config CONFIG_LOGREAD bool " logread" default y @@ -66,6 +74,17 @@ config CONFIG_LOGREAD utility will allow you to read the messages that are stored in the syslogd circular buffer. +config CONFIG_FEATURE_LOGREAD_REDUCED_LOCKING + bool " logread double buffering" + default n + depends on CONFIG_LOGREAD + help + 'logread' ouput to slow serial terminals can have + side effects on syslog because of the semaphore. + This option make logread to double buffer copy + from circular buffer, minimizing semaphore + contention at some minor memory expense. + config CONFIG_KLOGD bool "klogd" default n diff --git a/sysklogd/logread.c b/sysklogd/logread.c index 524178fe8..207e78b57 100644 --- a/sysklogd/logread.c +++ b/sysklogd/logread.c @@ -108,8 +108,7 @@ extern int logread_main(int argc, char **argv) i = follow ? buf->tail : buf->head; do { -#undef RC_LOGREAD -#ifdef RC_LOGREAD +#ifdef CONFIG_FEATURE_LOGREAD_REDUCED_LOCKING char *buf_data; int log_len,j; #endif @@ -128,7 +127,7 @@ extern int logread_main(int argc, char **argv) } // Read Memory -#ifdef RC_LOGREAD +#ifdef CONFIG_FEATURE_LOGREAD_REDUCED_LOCKING log_len = buf->tail - i; if (log_len < 0) log_len += buf->size; @@ -155,7 +154,7 @@ extern int logread_main(int argc, char **argv) // release the lock on the log chain sem_up(log_semid); -#ifdef RC_LOGREAD +#ifdef CONFIG_FEATURE_LOGREAD_REDUCED_LOCKING for (j=0; j < log_len; j+=strlen(buf_data+j)+1) { printf("%s", buf_data+j); if (follow) diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c index 622500e48..42426ed80 100644 --- a/sysklogd/syslogd.c +++ b/sysklogd/syslogd.c @@ -94,6 +94,12 @@ static int local_logging = FALSE; /* circular buffer variables/structures */ #ifdef CONFIG_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> @@ -114,7 +120,7 @@ static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} }; // set SMwdn static int shmid = -1; // ipc shared memory id static int s_semid = -1; // ipc semaphore id -static int data_size = 16000; // default data size +static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024); // default shm size static int circular_logging = FALSE; /* @@ -156,7 +162,7 @@ void ipcsyslog_cleanup(void) void ipcsyslog_init(void) { if (buf == NULL) { - if ((shmid = shmget(KEY_ID, data_size, IPC_CREAT | 1023)) == -1) { + if ((shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023)) == -1) { bb_perror_msg_and_die("shmget"); } @@ -164,7 +170,7 @@ void ipcsyslog_init(void) bb_perror_msg_and_die("shmat"); } - buf->size = data_size - sizeof(*buf); + buf->size = shm_size - sizeof(*buf); buf->head = buf->tail = 0; // we'll trust the OS to set initial semval to 0 (let's hope) @@ -654,7 +660,7 @@ extern int syslogd_main(int argc, char **argv) if (optarg) { int buf_size = atoi(optarg); if (buf_size >= 4) { - data_size = buf_size; + shm_size = buf_size; } } circular_logging = TRUE; |