include/os.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by www.databasecache.com                           *
   3  *   Contact: praba_tuty@databasecache.com                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15   ***************************************************************************/
  16 #ifndef OS_H
  17 #define OS_H
  18 #include<build.h>
  19
  20 #if defined(solaris) || defined(LINUX)
  21
  22 #include <stdio.h>
  23 #include <sys/mman.h>
  24 #include <sys/shm.h>
  25 #include <sys/errno.h>
  26 #include <crypt.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <pthread.h>
  34 #include <math.h>
  35 #include <signal.h>
  36 #include <ctype.h>
  37 #if defined(solaris)
  38     #include <sys/varargs.h>
  39 #endif
  40 #if defined(LINUX)
  41     #include <sys/time.h>
  42     #include <stdarg.h>
  43 #endif
  44 typedef void (*sighandler_t)(int);
  45
  46 enum FileOpenMode
  47 {
  48     fileOpenReadOnly = O_RDONLY,
  49     fileOpenWriteOnly = O_WRONLY,
  50     fileOpenReadWrite = O_RDWR,
  51     fileOpenAppend = O_APPEND |O_RDWR,
  52     fileOpenCreat = O_CREAT |O_RDWR,
  53     // If set and fileOpenExcl is set, the
  54     // open will fail if the file already exists.
  55     fileOpenExcl = O_EXCL,
  56     fileOpenTrunc = O_TRUNC
  57 };
  58
  59 enum MapProtMode
  60 {
  61     mapProtRead = PROT_READ,
  62     mapProtWrite = PROT_WRITE,
  63     mapProcExec = PROT_EXEC,
  64     mapProcNone = PROT_NONE
  65 };
  66
  67 enum MapMode
  68 {
  69     mapShared = MAP_SHARED,
  70     mapPrivate = MAP_PRIVATE,
  71     mapFixed = MAP_FIXED,
  72     // Interpret address exactly.
  73     mapNoReserve = MAP_NORESERVE,
  74     // Don't reserver swap space.
  75
  76     //mapAlign = MAP_ALIGN,
  77     //for msync system call
  78     mapSync = MS_SYNC ,
  79     mapASync = MS_ASYNC
  80
  81 };
  82
  83 #define MAX_FILE_LEN 1024
  84 #define IDENTIFIER_LENGTH 128
  85 #define DEFAULT_VALUE_BUF_LENGTH 32
  86 #define SYSTEMDB "SYSTEMDB"
  87 #define DBAUSER "root"
  88 #define DBAPASS "manager"
  89 #define LOCK_BUCKET_SIZE 2048
  90 #define MAX_CHUNKS 20
  91 #define PAGE_SIZE Conf::config.getPageSize()
  92 #define MAX_MUTEX_PER_THREAD 5
  93 #define MAX_THREADS_PER_PROCESS 30
  94 #define MAX_FILE_PATH_LEN 1024
  95
  96
  97 #define BIT(x) (1 << (x))
  98 #define SETBITS(x,y) ((x) |= (y))
  99 #define CLEARBITS(x,y) ((x) &= (~(y)))
 100 #define SETBIT(x,y) SETBITS((x), (BIT((y))))
 101 #define CLEARBIT(x,y) CLEARBITS((x), (BIT((y))))
 102 #define BITSET(x,y) ((x) & (BIT(y)))
 103
 104
 105 typedef key_t shared_memory_key;
 106 typedef int   shared_memory_id;
 107
 108 #endif
 109
 110
 111 class os
 112 {
 113     public:
 114     static caddr_t mmap(caddr_t addr, size_t len, int prot, int flags, int fildes, off_t off);
 115     static int munmap(caddr_t addr, size_t len);
 116     static int openFile(const char *name, FileOpenMode flags, size_t size);
 117     static int closeFile(int fd);
 118     static off_t lseek(int fildes, off_t offset, int whence);
 119     static size_t write(int fildes, char *buf, size_t size);
 120     static int msync(caddr_t addr, size_t len, int flags);
 121     static int fsync(int fildes);
 122     static size_t alignLong(size_t size);
 123     static size_t align(size_t size);
 124     static char*  encrypt(const char * key, const char *salt);
 125     static void* memset(void *src, int c, size_t size);
 126     static void* memcpy(void *src, const void *dest, size_t size);
 127     static int   memcmp(const void *s1, const void *s2, size_t size);
 128     static int select(int nfds, fd_set *readfds, fd_set *writefds,
 129                       fd_set *exceptfds, struct timeval * timeout);
 130
 131     static shared_memory_id shm_create(shared_memory_key key, size_t size, int flag);
 132     static shared_memory_id shm_open(shared_memory_key key, size_t size, int flag);
 133     static void*  shm_attach(shared_memory_id id, const void *ptr, int flag);
 134     static int shm_detach (void*);
 135     static int shmctl(int shmid, int cmd);
 136     static double floor(double val);
 137     static sighandler_t signal(int signum, sighandler_t handler);
 138
 139     static int gettimeofday(struct timeval *tp);
 140     static struct tm* localtime(long *secs);
 141     static pid_t getpid();
 142     static pthread_t getthrid();
 143     static char* getenv(const char *envVarName);
 144     static int setenv(const char *envVarName, const char *value);
 145
 146     static int kill(pid_t pid, int sig);
 147     static bool atobool(char *value);
 148     static pid_t createProcess(const char* cmdName, const char *arg0, ...);
 149 };
 150
 151 #endif