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/*
* Copyright (c) 2005 Christophe Varoqui
* Copyright (c) 2005 Benjamin Marzinski, Redhat
* Copyright (c) 2005 Jun'ichi Nomura, NEC
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include "memory.h"
#include "log.h"
#define ALIGN(len, s) (((len)+(s)-1)/(s)*(s))
#if LOGDBG
static void dump_logarea (void)
{
struct logmsg * msg;
logdbg(stderr, "\n==== area: start addr = %p, end addr = %p ====\n",
la->start, la->end);
logdbg(stderr, "|addr |next |prio|msg\n");
for (msg = (struct logmsg *)la->head; (void *)msg != la->tail;
msg = msg->next)
logdbg(stderr, "|%p |%p |%i |%s\n", (void *)msg, msg->next,
msg->prio, (char *)&msg->str);
logdbg(stderr, "|%p |%p |%i |%s\n", (void *)msg, msg->next,
msg->prio, (char *)&msg->str);
logdbg(stderr, "\n\n");
}
#endif
static int logarea_init (int size)
{
logdbg(stderr,"enter logarea_init\n");
la = (struct logarea *)MALLOC(sizeof(struct logarea));
if (!la)
return 1;
if (size < MAX_MSG_SIZE)
size = DEFAULT_AREA_SIZE;
la->start = MALLOC(size);
memset(la->start, 0, size);
if (!la->start) {
FREE(la);
return 1;
}
la->empty = 1;
la->end = la->start + size;
la->head = la->start;
la->tail = la->start;
la->buff = MALLOC(MAX_MSG_SIZE + sizeof(struct logmsg));
if (!la->buff) {
FREE(la->start);
FREE(la);
return 1;
}
return 0;
}
int log_init(char *program_name, int size)
{
logdbg(stderr,"enter log_init\n");
openlog(program_name, 0, LOG_DAEMON);
if (logarea_init(size))
return 1;
return 0;
}
void free_logarea (void)
{
FREE(la->start);
FREE(la->buff);
FREE(la);
return;
}
void log_close (void)
{
free_logarea();
closelog();
return;
}
int log_enqueue (int prio, const char * fmt, va_list ap)
{
int len, fwd;
char buff[MAX_MSG_SIZE];
struct logmsg * msg;
struct logmsg * lastmsg;
lastmsg = (struct logmsg *)la->tail;
if (!la->empty) {
fwd = sizeof(struct logmsg) +
strlen((char *)&lastmsg->str) * sizeof(char) + 1;
la->tail += ALIGN(fwd, sizeof(void *));
}
vsnprintf(buff, MAX_MSG_SIZE, fmt, ap);
len = ALIGN(sizeof(struct logmsg) + strlen(buff) * sizeof(char) + 1,
sizeof(void *));
/* not enough space on tail : rewind */
if (la->head <= la->tail && len > (la->end - la->tail)) {
logdbg(stderr, "enqueue: rewind tail to %p\n", la->tail);
la->tail = la->start;
if (la->empty)
la->head = la->start;
}
/* not enough space on head : drop msg */
if (la->head > la->tail && len >= (la->head - la->tail)) {
logdbg(stderr, "enqueue: log area overrun, drop msg\n");
if (!la->empty)
la->tail = lastmsg;
return 1;
}
/* ok, we can stage the msg in the area */
la->empty = 0;
msg = (struct logmsg *)la->tail;
msg->prio = prio;
memcpy((void *)&msg->str, buff, strlen(buff));
lastmsg->next = la->tail;
msg->next = la->head;
logdbg(stderr, "enqueue: %p, %p, %i, %s\n", (void *)msg, msg->next,
msg->prio, (char *)&msg->str);
#if LOGDBG
dump_logarea();
#endif
return 0;
}
int log_dequeue (void * buff)
{
struct logmsg * src = (struct logmsg *)la->head;
struct logmsg * dst = (struct logmsg *)buff;
struct logmsg * lst = (struct logmsg *)la->tail;
if (la->empty)
return 1;
int len = strlen((char *)&src->str) * sizeof(char) +
sizeof(struct logmsg) + 1;
dst->prio = src->prio;
memcpy(dst, src, len);
if (la->tail == la->head)
la->empty = 1; /* we purge the last logmsg */
else {
la->head = src->next;
lst->next = la->head;
}
logdbg(stderr, "dequeue: %p, %p, %i, %s\n",
(void *)src, src->next, src->prio, (char *)&src->str);
memset((void *)src, 0, len);
return la->empty;
}
/*
* this one can block under memory pressure
*/
void log_syslog (void * buff)
{
struct logmsg * msg = (struct logmsg *)buff;
syslog(msg->prio, "%s", (char *)&msg->str);
}
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