diff options
| -rw-r--r-- | sysklogd/logread.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/sysklogd/logread.c b/sysklogd/logread.c index bea73d932..da4a4d4df 100644 --- a/sysklogd/logread.c +++ b/sysklogd/logread.c @@ -10,10 +10,11 @@ */ //usage:#define logread_trivial_usage -//usage: "[-f]" +//usage: "[-fF]" //usage:#define logread_full_usage "\n\n" //usage: "Show messages in syslogd's circular buffer\n" //usage: "\n -f Output data as log grows" +//usage: "\n -F Same as -f, but dump buffer first" #include "libbb.h" #include <sys/ipc.h> @@ -83,7 +84,7 @@ int logread_main(int argc UNUSED_PARAM, char **argv) unsigned cur; int log_semid; /* ipc semaphore id */ int log_shmid; /* ipc shared memory id */ - smallint follow = getopt32(argv, "f"); + int follow = getopt32(argv, "fF"); INIT_G(); @@ -106,7 +107,7 @@ int logread_main(int argc UNUSED_PARAM, char **argv) /* Max possible value for tail is shbuf->size - 1 */ cur = shbuf->tail; - /* Loop for logread -f, one pass if there was no -f */ + /* Loop for -f or -F, one pass otherwise */ do { unsigned shbuf_size; unsigned shbuf_tail; @@ -129,7 +130,12 @@ int logread_main(int argc UNUSED_PARAM, char **argv) printf("cur:%u tail:%u size:%u\n", cur, shbuf_tail, shbuf_size); - if (!follow) { + if (!(follow & 1)) { /* not -f */ + /* if -F, "convert" it to -f, so that we dont + * dump the entire buffer on each iteration + */ + follow >>= 1; + /* advance to oldest complete message */ /* find NUL */ cur += strlen(shbuf_data + cur); @@ -142,7 +148,7 @@ int logread_main(int argc UNUSED_PARAM, char **argv) cur++; if (cur >= shbuf_size) /* last byte in buffer? */ cur = 0; - } else { /* logread -f */ + } else { /* -f */ if (cur == shbuf_tail) { sem_up(log_semid); fflush_all(); |