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log.c
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log.c
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#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <stdbool.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <fcntl.h>
#include "compiler.h"
#include "asm/types.h"
#include "util.h"
#include "cr_options.h"
#include "servicefd.h"
#define DEFAULT_LOGFD STDERR_FILENO
/* Enable timestamps if verbosity is increased from default */
#define LOG_TIMESTAMP (DEFAULT_LOGLEVEL + 1)
static unsigned int current_loglevel = DEFAULT_LOGLEVEL;
static char buffer[PAGE_SIZE];
static char buf_off = 0;
static struct timeval start;
/*
* Manual buf len as sprintf will _always_ put '\0' at the end,
* but we want a "constant" pid to be there on restore
*/
#define TS_BUF_OFF 12
static void timediff(struct timeval *from, struct timeval *to)
{
to->tv_sec -= from->tv_sec;
if (to->tv_usec >= from->tv_usec)
to->tv_usec -= from->tv_usec;
else {
to->tv_sec--;
to->tv_usec += 1000000 - from->tv_usec;
}
}
static void print_ts(void)
{
struct timeval t;
gettimeofday(&t, NULL);
timediff(&start, &t);
snprintf(buffer, TS_BUF_OFF,
"(%02u.%06u)", (unsigned)t.tv_sec, (unsigned)t.tv_usec);
buffer[TS_BUF_OFF - 1] = ' '; /* kill the '\0' produced by snprintf */
}
int log_get_fd(void)
{
int fd = get_service_fd(LOG_FD_OFF);
return fd < 0 ? DEFAULT_LOGFD : fd;
}
static void reset_buf_off(void)
{
if (current_loglevel >= LOG_TIMESTAMP)
/* reserve space for a timestamp */
buf_off = TS_BUF_OFF;
else
buf_off = 0;
}
int log_init(const char *output)
{
int new_logfd, fd;
gettimeofday(&start, NULL);
reset_buf_off();
if (output) {
new_logfd = open(output, O_CREAT|O_TRUNC|O_WRONLY|O_APPEND, 0600);
if (new_logfd < 0) {
pr_perror("Can't create log file %s", output);
return -1;
}
} else {
new_logfd = dup(DEFAULT_LOGFD);
if (new_logfd < 0) {
pr_perror("Can't dup log file");
return -1;
}
}
fd = install_service_fd(LOG_FD_OFF, new_logfd);
close(new_logfd);
if (fd < 0)
goto err;
return 0;
err:
pr_perror("Log engine failure, can't duplicate descriptor");
return -1;
}
int log_init_by_pid(void)
{
char path[PATH_MAX];
/*
* reset buf_off as this fn is called on each fork while
* restoring process tree
*/
reset_buf_off();
if (!opts.log_file_per_pid) {
buf_off += snprintf(buffer + buf_off, PAGE_SIZE - buf_off, "%6d: ", getpid());
return 0;
}
if (!opts.output)
return 0;
snprintf(path, PATH_MAX, "%s.%d", opts.output, getpid());
return log_init(path);
}
void log_fini(void)
{
close_service_fd(LOG_FD_OFF);
}
void log_set_loglevel(unsigned int level)
{
if (!level)
current_loglevel = DEFAULT_LOGLEVEL;
else
current_loglevel = level;
}
unsigned int log_get_loglevel(void)
{
return current_loglevel;
}
static void __print_on_level(unsigned int loglevel, const char *format, va_list params)
{
int fd, size, ret, off = 0;
if (unlikely(loglevel == LOG_MSG)) {
fd = STDOUT_FILENO;
off = buf_off; /* skip dangling timestamp */
} else {
if (loglevel > current_loglevel)
return;
fd = log_get_fd();
if (current_loglevel >= LOG_TIMESTAMP)
print_ts();
}
size = vsnprintf(buffer + buf_off, PAGE_SIZE - buf_off, format, params);
size += buf_off;
while (off < size) {
ret = write(fd, buffer + off, size - off);
if (ret <= 0)
break;
off += ret;
}
}
void print_on_level(unsigned int loglevel, const char *format, ...)
{
va_list params;
va_start(params, format);
__print_on_level(loglevel, format, params);
va_end(params);
}
int write_pidfile(int pid)
{
int fd;
fd = open(opts.pidfile, O_WRONLY | O_TRUNC | O_CREAT, 0600);
if (fd == -1) {
pr_perror("Can't open %s", opts.pidfile);
return -1;
}
dprintf(fd, "%d", pid);
close(fd);
return 0;
}