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/*
* c++
* A logger for Linux , multiprocess safe
* Author: TT_last
*
* Use:
* //Open log file first
* log_open("log.txt");
*
* //use it as printf("Hello %s\n", name)
* LOG_DEBUG("Here is a bug %d", line);
* LOG_NOTICE("-_- ");
* LOG_WARNING("...");
* LOG_BUG("-_-!!!");
*
* //close log file
* log_close();
*
* //3 level: DEBUG NOTICE WARNING BUG
*/
#ifndef __LOGGER_H__
#define __LOGGER_H__
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <cstring>
#include <unistd.h>
#include <errno.h>
#include <stdarg.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int log_open(const char *filename);
void log_close();
static int log_write(int level, const char *file, const int line, const char *fmt, ...);
int log_lock(int fd, int cmd, int type, off_t offset, int whence, off_t len);
const int LOG_DEBUG = 0;
const int LOG_NOTICE = 1;
const int LOG_WARNING = 2;
const int LOG_BUG = 3;
static char LOG_INFO[][10] =
{"DEBUG", "NOTICE", "WARNING", "BUG"};
// Lock file log
#define LOG_WLOCK(fd, offset, whence, len) \
log_lock(fd, F_SETLKW, F_WRLCK, offset, whence, len)
#define LOG_UNLOCK(fd, offset, whence, len) \
log_lock(fd, F_SETLK, F_UNLCK, offset, whence, len)
#define LOG_DEBUG(x...) log_write(LOG_DEBUG, __FILE__, __LINE__, ##x)
#define LOG_NOTICE(x...) log_write(LOG_NOTICE, __FILE__, __LINE__, ##x)
#define LOG_WARNING(x...) log_write(LOG_WARNING, __FILE__, __LINE__, ##x)
#define LOG_BUG(x...) log_write(LOG_BUG, __FILE__, __LINE__, ##x)
//log 文件指针 文件名 线程安全
static int log_fd = -1;
static char *log_filename = NULL;
static int log_opened = 0;
#define log_buffer_size 8192 // 8k
static char log_buffer[log_buffer_size];
int log_open(const char *filename)
{
if(log_opened)
{
fprintf(stderr, "logger: log is opened\n");
return 1;
}
<
99E6
div id="LC77" class="react-file-line html-div" data-testid="code-cell" data-line-number="77" style="position:relative"> int len = strlen(filename);
log_filename = (char *) malloc(sizeof(char)*len + 1);
strcpy(log_filename, filename);
log_fd = open(log_filename, O_APPEND|O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR);
if(log_fd == -1)
{
printf("14 0 -38\n");
fprintf(stderr, "log_file: %s", log_filename);
perror("Can not open log file");
exit(1);
}
log_opened = 1;
atexit(log_close);
return 0;
}
void log_close()
{
if(log_opened)
{
close(log_fd);
free(log_filename);
log_fd = -1;
log_filename = NULL;
log_opened = 0;
}
}
int log_lock(int fd, int cmd, int type, off_t offset, int whence, off_t len)
{
struct flock lock;
//F_RDLCK F_WRLCK F_UNLCK
lock.l_type = type;
//byte offset, relation to l_whence
lock.l_start = offset;
//SEEK_SET SEEK_CUR SEEK_END
lock.l_whence = whence;
//**bytes (0 means to eof)
lock.l_len = len;
return ( fcntl(fd, cmd, &lock) );
}
int log_write(int level, const char *file, const int line, const char *fmt, ...)
{
if(log_opened == 0)
{
fprintf(stderr, "log_open not called yet\n");
exit(1);
}
static char buffer[log_buffer_size];
static char datatime[100];
static time_t now;
now = time(NULL);
strftime(datatime, 99, "%Y-%m-%d %H:%M:%S", localtime(&now));
va_list ap;
va_start(ap, fmt);
vsnprintf(log_buffer, log_buffer_size, fmt, ap);
va_end(ap);
size_t count = snprintf(buffer, log_buffer_size, "%s [%s] [%s:%d]--->%s\n",
LOG_INFO[level], datatime, file, line, log_buffer);
//write(log_fd, buffer, count);
if(LOG_WLOCK(log_fd, 0, SEEK_SET, 0) < 0)
{
perror("lock error");
exit(1);
}
else
{
if(write(log_fd, buffer, count) < 0)
{
perror("write error");
exit(1);
}
LOG_UNLOCK(log_fd, 0, SEEK_SET, 0);
}
return 0;
}
#endif
/* debug
int main()
{
pid_t pid = fork();
//if(pid > 0)
//{
//log_open("log.txt");
//LOG_WLOCK(log_fd, 0, SEEK_SET, 0);
//sleep(5);
//LOG_UNLOCK(log_fd, 0, SEEK_SET, 0);
//}else
//{
//sleep(1);
//printf("chirld running\n");
fork(); fork();
for(int i = 0;i < 5;i ++)
{
log_open("log.txt");
LOG_BUG("here is a bug %d", getpid());
LOG_DEBUG("here is a debug %d", getpid());
log_close();
}
//}
return 0;
}*/