linux应用程序打印log到文件,linux环境应用程序LOG日志打印（C语言）

下面是前段时间做项目用到的一个输出LOG日志的代码，每个文件最多记录10W行，超过10W行，将当前日志文件重命名，重新再打开。直接看代码吧，很简单！

int InitTCpRtpLog()

{

char log[256];

mkdir(TCP_RTP_LOG_PATH, 0755);

snprintf(log, sizeof(log), "%s/%s", TCP_RTP_LOG_PATH, TCP_RTP_LOG_FILE);

vTcpRtpLogHandle = fopen((char*)log, "a");

if (vTcpRtpLogHandle){

PrintMsgTrace("###%s(),creat log file %s sucessfull!n",__FUNCTION__, log);

return 0;

}else{

PrintMsgTrace("###$s(), Fail openning event log file (errno=%s)n", __FUNCTION__, strerror(errno));

return - 1;

}

}

static int _rebuildTcpRtpLogFiles()

{

char tmp[256];

char tmp2[256];

char date[128];

time_t now;

struct tm ptm;

if (vTcpRtpLogHandle)

{

fclose(vTcpRtpLogHandle);

time(&now);

localtime_r(&now,&ptm);

strftime((char *)date, 128, "_%F_%T", &ptm);

snprintf(tmp, sizeof(tmp), "%s/%s", TCP_RTP_LOG_PATH, TCP_RTP_LOG_FILE);

snprintf(tmp2, sizeof(tmp2), "%s_%s.log", tmp,date);

remove(tmp2);

rename(tmp, tmp2);

vTcpRtpLogHandle = fopen((char*)tmp, "a");

}

return 1;

}

void LogTcpRtp(char *p_fmt, ...)

{

char date[256];

time_t now;

struct tm ptm;

va_list ap;

if (!vTcpRtpLogHandle){

return;

}

pthread_mutex_lock(&_vTcpRtpLogMutex);

time(&now); // Gets the system time

if (localtime_r(&now, &ptm))

{

strftime(date, sizeof (date), "%F %T", &ptm);

fprintf(vTcpRtpLogHandle, "[ %s ]:", date);

va_start(ap, p_fmt);

vfprintf(vTcpRtpLogHandle, p_fmt, ap);

va_end(ap);

fflush(vTcpRtpLogHandle);

_vCurTcpRtpLogNum++;

if (_vCurTcpRtpLogNum > MAX_RTP_TCP_NUMBER){

_rebuildTcpRtpLogFiles();

_vCurTcpRtpLogNum = 0;

}

}

pthread_mutex_unlock(&_vTcpRtpLogMutex);

}