For Linux systems, there is logrotate. For embedded systems, there's
ring_log.
Specify how many total logs you want to keep (in bytes), and then use
ring_log's API to add new log entries.
ring_log will manage the on-disk log storage such that only the N most recent
log entries are kept. It will use the amount of disk space that you allow it
to, and no more.
Copy over ring_log.c, ring_log.h, and the ring_log_arch_*.c matching your
OS.
Copy and edit ring_log_config.c. Important values such as the total log
size, the number of logs, etc, are defined there.
Start up ring_log and write a few entries (see example.c):
if (!ring_log_init()) {
puts("ring_log_init failed");
exit(1);
}
ring_log_write_tail("log_a", "one", 3);
ring_log_write_tail_complete("log_a");
ring_log_write_tail("log_a", "two", 3);
ring_log_write_tail_complete("log_a");
ring_log_write_tail("log_a", "three", 5);
ring_log_write_tail_complete("log_a");
Read all the entries out:
while (ring_log_has_unread("log_a")) {
int read_now;
char buffer[8];
size_t read_total = 0;
printf("entry: ");
while ((read_now = ring_log_read_head("log_a", &buffer, sizeof(buffer), &read_total))) {
printf("%.*s", read_now, (char *)&buffer);
};
puts("");
ring_log_read_head_success("log_a");
}
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