一个进程安全的日志类, Linux实现

项目中需要分类日志功能，且日志由多个进程产生，所以写了这个类。

1. #ifndefCAPPLOG_H_
2. #defineCAPPLOG_H_
4. #include"Generic.h"
5. enumLOG_TYPE
6. {
7. LOG_DEAGNOSTIC_MSG=0x00000000,
8. LOG_EVENT=0x00000001,
9. LOG_ACTIVITY=0x00000002,
10. LOG_ERROR=0x00000004,
11. };
13. classCAppLog{
14. public:
15. CAppLog();
16. virtual~CAppLog();
18. staticvoidappendDeagnosticMsg(constchar*lpszFmt,...);
19. staticvoidappendEvent(constchar*lpszFmt,...);
20. staticvoidappendActivity(constchar*lpszFmt,...);
21. staticvoidappendError(constchar*lpszFmt,...);
24. private:
25. staticsem_t*s_pLogFileSem;
27. staticvoidappend(LOG_TYPEemType,constchar*lpszText);
28. };
31. #endif/*CAPPLOG_H_*/

以下是它的实现

1. /*
2. *CAppLog.cpp
3. *
4. *Createdon:Jan1,2009
5. *Author:root
6. */
8. #include"CAppLog.h"
9. #include"CSystemHelper.h"
11. #defineLOG_SEM_NAME"LogFileSem"
14. sem_t*CAppLog::s_pLogFileSem=NULL;
15. CAppLogg_oAppLog;
18. CAppLog::CAppLog(){
19. if(s_pLogFileSem==NULL)
20. {
21. s_pLogFileSem=sem_open(LOG_SEM_NAME,O_CREAT,0666,1);
22. }
23. }
25. CAppLog::~CAppLog(){
26. if(s_pLogFileSem!=NULL)
27. {
28. sem_close(s_pLogFileSem);
29. s_pLogFileSem=NULL;
30. }
31. }
33. voidCAppLog::append(LOG_TYPEemType,constchar*lpszText)
34. {
35. charszBuffer[10240]={0};
36. intnRet=readlink("/proc/self/exe",szBuffer,sizeof(szBuffer));
37. if(nRet<=0||nRet>=PATH_MAX)
38. return;
40. stringstrTemp(szBuffer);
41. stringstrDir=strTemp.substr(0,strTemp.rfind('/')+1);
42. stringstrExe=strTemp.substr(strTemp.rfind('/')+1);
44. time_tulNow={0};
45. time(&ulNow);
46. tm*pNow=localtime(&ulNow);
47. memset(szBuffer,0,sizeof(szBuffer));
48. sprintf(szBuffer,"%sLog/%04d/%04d-%02d/"
49. ,strDir.c_str()
50. ,1900+pNow->tm_year
51. ,1900+pNow->tm_year
52. ,1+pNow->tm_mon
53. );
54. CSystemHelper::createDirectory(szBuffer);
55. sprintf(szBuffer,"%sLog/%04d/%04d-%02d/%04d-%02d-%02d.log"
56. ,strDir.c_str()
57. ,1900+pNow->tm_year
58. ,1900+pNow->tm_year
59. ,1+pNow->tm_mon
60. ,1900+pNow->tm_year
61. ,1+pNow->tm_mon
62. ,pNow->tm_mday
63. );
65. sem_wait(s_pLogFileSem);
67. {
68. ofstreamstream(szBuffer,ios::out|ios::app);
69. if(stream)
70. {
71. charszFormated[20480]={0};
72. sprintf(szFormated,"/r/n%02d[%02d:%02d:%02dPID=%05dTID=%05ldEXE=%-15s]%s"
73. ,emType
74. ,pNow->tm_hour
75. ,pNow->tm_min
76. ,pNow->tm_sec
77. ,getpid()
78. ,(long)syscall(SYS_gettid)
79. ,strExe.c_str()
80. ,lpszText
81. );
82. stream<<szFormated;
83. stream.flush();
84. stream.close();
85. }
86. }
88. sem_post(s_pLogFileSem);
89. }
91. voidCAppLog::appendDeagnosticMsg(constchar*lpszFmt,...)
92. {
93. va_listarg;
94. va_start(arg,lpszFmt);
95. charszBuffer[10240]={0};
96. vsprintf(szBuffer,lpszFmt,arg);
97. va_end(arg);
99. CAppLog::append(LOG_DEAGNOSTIC_MSG,szBuffer);
100. }
102. voidCAppLog::appendEvent(constchar*lpszFmt,...)
103. {
104. va_listarg;
105. va_start(arg,lpszFmt);
106. charszBuffer[10240]={0};
107. vsprintf(szBuffer,lpszFmt,arg);
108. va_end(arg);
110. CAppLog::append(LOG_EVENT,szBuffer);
111. }
113. voidCAppLog::appendActivity(constchar*lpszFmt,...)
114. {
115. va_listarg;
116. va_start(arg,lpszFmt);
117. charszBuffer[10240]={0};
118. vsprintf(szBuffer,lpszFmt,arg);
119. va_end(arg);
121. CAppLog::append(LOG_ACTIVITY,szBuffer);
122. }
124. voidCAppLog::appendError(constchar*lpszFmt,...)
125. {
126. va_listarg;
127. va_start(arg,lpszFmt);
128. charszBuffer[10240]={0};
129. vsprintf(szBuffer,lpszFmt,arg);
130. va_end(arg);
132. CAppLog::append(LOG_ERROR,szBuffer);
133. }

使用起来很简单，将类加入到工程，然后在需要的地方包含此类的头文件，然后直接调用静态方法。这里用到了一个辅助类的函数 CSystemHelper::createDirectory,它的实现如下：

1. voidCSystemHelper::createDirectory(constchar*lpszDir)
2. {
3. stringstrDir(lpszDir);
4. intnIndex=0;
5. while(nIndex!=string::npos)
6. {
7. intnFind=strDir.find("/",nIndex+1);
8. stringstrTemp=strDir.substr(0,nFind+1);
9. DIR*dir=opendir(strTemp.c_str());
10. if(dir!=NULL)
11. closedir(dir);
12. else
13. mkdir(strTemp.c_str(),S_IRWXU|S_IRWXG|S_IROTH|S_IXOTH);
15. nIndex=nFind;
16. }
17. }