include/os.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Prabakaran Thirumalai   *
   3  *   praba_tuty@yahoo.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
  19 #define linux 1
  20 #define i686 1
  21 //#define solaris
  22 //#define sparc
  23
  24 #if defined(solaris) || defined(linux)
  25
  26 #include <stdio.h>
  27 #include <sys/mman.h>
  28 #include <sys/shm.h>
  29 #include <sys/errno.h>
  30 #include <crypt.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <pthread.h>
  37 #include <math.h>
  38 #include <signal.h>
  39 #if defined(solaris)
  40     #include <sys/varargs.h>
  41 #endif
  42 #if defined(linux)
  43     #include <sys/time.h>
  44     #include <stdarg.h>
  45 #endif
  46 typedef void (*sighandler_t)(int);
  47
  48 enum FileOpenMode
  49 {
  50     fileOpenReadOnly = O_RDONLY,
  51     fileOpenWriteOnly = O_WRONLY,
  52     fileOpenReadWrite = O_RDWR,
  53     fileOpenAppend = O_APPEND |O_RDWR,
  54     fileOpenCreat = O_CREAT |O_RDWR,
  55     // If set and fileOpenExcl is set, the
  56     // open will fail if the file already exists.
  57     fileOpenExcl = O_EXCL,
  58     fileOpenTrunc = O_TRUNC
  59 };
  60
  61 enum MapProtMode
  62 {
  63     mapProtRead = PROT_READ,
  64     mapProtWrite = PROT_WRITE,
  65     mapProcExec = PROT_EXEC,
  66     mapProcNone = PROT_NONE
  67 };
  68
  69 enum MapMode
  70 {
  71     mapShared = MAP_SHARED,
  72     mapPrivate = MAP_PRIVATE,
  73     mapFixed = MAP_FIXED,
  74     // Interpret address exactly.
  75     mapNoReserve = MAP_NORESERVE,
  76     // Don't reserver swap space.
  77
  78     //mapAlign = MAP_ALIGN,
  79     //for msync system call
  80     mapSync = MS_SYNC ,
  81     mapASync = MS_ASYNC
  82
  83 };
  84
  85 #define MAX_FILE_LEN 1024
  86 #define PAGE_SIZE 8192
  87 #define IDENTIFIER_LENGTH 128
  88 #define DEFAULT_VALUE_BUF_LENGTH 32
  89 #define MAX_CHUNKS 100
  90 #define MAX_TRANS 100
  91 #define MAX_PROCESS 100
  92 #define SYSTEMDB "SYSTEMDB"
  93 #define DBAUSER "dba"
  94 #define DBAPASS "manager"
  95 #define SYSTEM_DB_SIZE 104857600
  96 #define SYSTEMDB_KEY   2222
  97 #define USERDB_KEY     5555
  98 typedef key_t shared_memory_key;
  99 typedef int   shared_memory_id;
 100
 101 #define LOCK_BUCKET_SIZE 2048
 102
 103 #endif
 104
 105
 106 class os
 107 {
 108     public:
 109     static caddr_t mmap(caddr_t addr, size_t len, int prot, int flags, int fildes, off_t off);
 110     static int munmap(caddr_t addr, size_t len);
 111     static int openFile(const char *name, FileOpenMode flags, size_t size);
 112     static int closeFile(int fd);
 113     static off_t lseek(int fildes, off_t offset, int whence);
 114     static size_t write(int fildes, char *buf, size_t size);
 115     static int msync(caddr_t addr, size_t len, int flags);
 116     static int fsync(int fildes);
 117     static size_t alignLong(size_t size);
 118     static size_t align(size_t size);
 119     static char*  encrypt(const char * key, const char *salt);
 120     static void* memset(void *src, int c, size_t size);
 121     static void* memcpy(void *src, const void *dest, size_t size);
 122     static int   memcmp(const void *s1, const void *s2, size_t size);
 123     static int select(int nfds, fd_set *readfds, fd_set *writefds,
 124                       fd_set *exceptfds, struct timeval * timeout);
 125
 126     static shared_memory_id shm_create(shared_memory_key key, size_t size, int flag);
 127     static shared_memory_id shm_open(shared_memory_key key, size_t size, int flag);
 128     static void*  shm_attach(shared_memory_id id);
 129     static int shm_detach (void*);
 130     static int shmctl(int shmid, int cmd);
 131     static double floor(double val);
 132     static sighandler_t signal(int signum, sighandler_t handler);
 133
 134     static int gettimeofday(struct timeval *tp);
 135     static struct tm* localtime(long *secs);
 136     static int getpid();
 137     static int getthrid();
 138
 139 };
 140
 141 #endif