c/c++ 记录日志，支持windows和linux,支持多线程

//#include "stdafx.h" #ifdef _MSC_VER #include <windows.h> #endif #include "WTLog.h" #include <stdlib.h> #include <malloc.h> #ifndef _MSC_VER pthread_mutex_t g_Mutex ; #endif #ifdef _MSC_VER CRITICAL_SECTION * g_pCrit; #endif FILE * g_pWTLog_File_descriptor; int LogInit(const char* szLogFileName) { errno = 0; g_pWTLog_File_descriptor = fopen(szLogFileName,"a"); if (NULL == g_pWTLog_File_descriptor) { if (EINVAL == errno) { printf("err:fopen log file %s failed\n",szLogFileName); } else { printf("err:unknow\n"); } return -1; } #ifdef _MSC_VER if( NULL == ( g_pCrit = (CRITICAL_SECTION *)malloc(sizeof(CRITICAL_SECTION)) ) ) { printf("fatal error\n"); return -1; } InitializeCriticalSection(g_pCrit); #else pthread_mutex_init(&g_Mutex,NULL); #endif return 0; } int LogAppend(LOG_LEVEL level,char * fmt,...) { //char szlog[MAX_CHAR_ONCE+1] = {0}; //char szHead[8] = {0}; short nHeadLen(0); int n, size = MAX_CHAR_ONCE; char *p, *np; va_list ap; if ((p = (char*)malloc(size)) == NULL) return NULL; while (1) { switch(level) { case INFO_LEVEL:sprintf(p,"INFO:"); nHeadLen = 5; break; case WARNING_LEVEL:sprintf(p,"WARNING:"); nHeadLen = 8; break; case ERROR_LEVEL: default:sprintf(p,"ERR:"); nHeadLen = 4; } va_start(ap, fmt); n = vsnprintf(p+nHeadLen, size, fmt, ap); va_end(ap); strcat(p,"\n"); if (n > -1 && n < size) { #ifdef _MSC_VER EnterCriticalSection(g_pCrit); #else pthread_mutex_lock(&g_Mutex ); #endif fwrite(p,sizeof(char),strlen(p),g_pWTLog_File_descriptor); #ifdef _MSC_VER LeaveCriticalSection(g_pCrit); #else pthread_mutex_unlock(&g_Mutex ); #endif break; } if (n > -1) size = n+8; else size *= 2; if ((np = (char*)realloc (p, size)) == NULL) { free(p); return NULL; } else { p = np; } } return 0; } int LogClose() { #ifdef _MSC_VER DeleteCriticalSection(g_pCrit); free(g_pCrit); #else pthread_mutex_destroy(&g_Mutex ); #endif if(EOF == fclose(g_pWTLog_File_descriptor)) { printf("err:fclose failed\n"); return -1; } return 0; }