1、日志初始化创建

 2、日志写入

 3、日志关闭

log.c

#include "log.h"static log_t LOG;//初始化日志文件，在当前目录创建日志文件
int log_init(char *pdirname)
{time_t t;struct tm *ptm = NULL;char filepath[64] = {0};int ret = 0;time(&t);ptm = localtime(&t);ret = access(pdirname, F_OK);if (0 != ret){mkdir(pdirname, 0777);}sprintf(filepath, "%s/log_%4d%02d%02d", pdirname, ptm->tm_year+1900, ptm->tm_mon+1, ptm->tm_mday);LOG.flog = fopen(filepath, "a");if (NULL == LOG.flog){fprintf(stderr, "logfile open faileed, can not record software information");return -1;}LOG.curtime = ptm;pthread_mutex_init(&LOG.lock, NULL);return 0;
}//写入日志文件
int log_write(LEVEL_T level,const char *pfile, const int line, const char *pfunc, const char *pstr, ...)
{time_t t;struct tm *ptm = NULL;char tmpinfo[1024] = {0};va_list pnext;pthread_mutex_lock(&LOG.lock);if (level < LOG.curlevel){pthread_mutex_unlock(&LOG.lock);return 0;}va_start(pnext, pstr);time(&t);ptm = localtime(&t);if (ptm->tm_year != LOG.curtime->tm_year | ptm->tm_mon != LOG.curtime->tm_mon | ptm->tm_mday != LOG.curtime->tm_mday){   pthread_mutex_unlock(&LOG.lock);log_deinit();log_init("LOG_FILE");pthread_mutex_lock(&LOG.lock);LOG.curtime = ptm;}sprintf(tmpinfo, "%s\n", pstr);fprintf(LOG.flog, "[%4d-%02d-%02d %02d-%02d-%02d] [%s %d %s] ", ptm->tm_year+1900, ptm->tm_mon+1, ptm->tm_mday, ptm->tm_hour, ptm->tm_min, ptm->tm_sec, pfile, line, pfunc);vfprintf(LOG.flog, tmpinfo, pnext);va_end(pnext);pthread_mutex_unlock(&LOG.lock);return 0;
}//销毁日志文件
int log_deinit(void)
{//关闭日志文件if (NULL != LOG.flog){pthread_mutex_lock(&LOG.lock);fclose(LOG.flog);LOG.flog = NULL;pthread_mutex_unlock(&LOG.lock);pthread_mutex_destroy(&LOG.lock);}return 0;
}//设置日志级别
void log_setlevel(LEVEL_T level)
{LOG.curlevel = level;return;
}

log.h

#ifndef __LOG_H__
#define __LOG_H__#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <pthread.h>typedef struct LOG_DATE 
{int year;int mon;int day;
}DATE_T;typedef enum LOG_LEVEL
{LOG_MASSAGE,LOG_WORNING,LOG_ERROR,
}LEVEL_T;typedef struct log
{FILE *flog;LEVEL_T curlevel;struct tm *curtime;  pthread_mutex_t lock;
}log_t;extern int log_init(char *pdirname);
extern int log_write(LEVEL_T level,const char *pfile, const int line, const char *pfunc, const char *pstr, ...);
extern int log_deinit(void);#endif

main.c

#include "log.h"int main(void)
{int num = 11451;log_init("LOG_FILE");log_write(LOG_MASSAGE, __FILE__,__LINE__,__func__, "===================================================");log_write(LOG_MASSAGE, __FILE__,__LINE__,__func__, "             software log record systerm           ");log_write(LOG_MASSAGE, __FILE__,__LINE__,__func__, "===================================================");log_write(LOG_MASSAGE, __FILE__,__LINE__,__func__, "hello world %d", num);log_write(LOG_MASSAGE, __FILE__,__LINE__,__func__, "hello world %d", num);log_deinit();return 0;
}

效果：