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 #include <sys/socket.h>
  38 #if defined(solaris)
  39     #include <sys/varargs.h>
  40 #endif
  41 #if defined(LINUX)
  42     #include <sys/time.h>
  43     #include <stdarg.h>
  44 #endif
  45 typedef void (*sighandler_t)(int);
  46
  47 enum FileOpenMode
  48 {
  49     fileOpenReadOnly = O_RDONLY,
  50     fileOpenWriteOnly = O_WRONLY,
  51     fileOpenReadWrite = O_RDWR,
  52     fileOpenAppend = O_APPEND |O_RDWR,
  53     fileOpenCreat = O_CREAT |O_RDWR,
  54     // If set and fileOpenExcl is set, the
  55     // open will fail if the file already exists.
  56     fileOpenExcl = O_EXCL,
  57     fileOpenTrunc = O_TRUNC
  58 };
  59
  60 enum MapProtMode
  61 {
  62     mapProtRead = PROT_READ,
  63     mapProtWrite = PROT_WRITE,
  64     mapProcExec = PROT_EXEC,
  65     mapProcNone = PROT_NONE
  66 };
  67
  68 enum MapMode
  69 {
  70     mapShared = MAP_SHARED,
  71     mapPrivate = MAP_PRIVATE,
  72     mapFixed = MAP_FIXED,
  73     // Interpret address exactly.
  74     mapNoReserve = MAP_NORESERVE,
  75     // Don't reserver swap space.
  76
  77     //mapAlign = MAP_ALIGN,
  78     //for msync system call
  79     mapSync = MS_SYNC ,
  80     mapASync = MS_ASYNC
  81
  82 };
  83
  84 #define MAX_FILE_LEN 1024
  85 #define IDENTIFIER_LENGTH 64
  86 #define ERROR_STRING_LENGTH 128
  87 #define DEFAULT_VALUE_BUF_LENGTH 32
  88 #define SYSTEMDB "SYSTEMDB"
  89 #define DBAUSER "root"
  90 #define DBAPASS "manager"
  91 #define LOCK_BUCKET_SIZE 2048
  92 #define MAX_CHUNKS 20
  93 #define PAGE_SIZE Conf::config.getPageSize()
  94 #define MAX_MUTEX_PER_THREAD 3
  95 #define MAX_THREADS_PER_PROCESS 30
  96 #define MAX_FILE_PATH_LEN 1024
  97 #define CHUNK_NAME_LEN 64
  98
  99 #define BIT(x) (1 << (x))
 100 #define SETBITS(x,y) ((x) |= (y))
 101 #define CLEARBITS(x,y) ((x) &= (~(y)))
 102 #define SETBIT(x,y) SETBITS((x), (BIT((y))))
 103 #define CLEARBIT(x,y) CLEARBITS((x), (BIT((y))))
 104 #define BITSET(x,y) ((x) & (BIT(y)))
 105
 106
 107 typedef key_t shared_memory_key;
 108 typedef int   shared_memory_id;
 109
 110 #endif
 111
 112
 113 class os
 114 {
 115     public:
 116     static caddr_t mmap(caddr_t addr, size_t len, int prot, int flags, int fildes, off_t off);
 117     static int munmap(caddr_t addr, size_t len);
 118     static int openFile(const char *name, FileOpenMode flags, size_t size);
 119     static int closeFile(int fd);
 120     static off_t lseek(int fildes, off_t offset, int whence);
 121     static size_t write(int fildes, char *buf, size_t size);
 122     static int msync(caddr_t addr, size_t len, int flags);
 123     static int fsync(int fildes);
 124     static size_t alignLong(size_t size);
 125     static size_t align(size_t size);
 126     static char*  encrypt(const char * key, const char *salt);
 127     static void* memset(void *src, int c, size_t size);
 128     static void* memcpy(void *src, const void *dest, size_t size);
 129     static int   memcmp(const void *s1, const void *s2, size_t size);
 130     static int select(int nfds, fd_set *readfds, fd_set *writefds,
 131                       fd_set *exceptfds, struct timeval * timeout);
 132
 133     static int usleep(int microsecs);
 134     static int sleep(int secs);
 135     static shared_memory_id shm_create(shared_memory_key key, size_t size, int flag);
 136     static shared_memory_id shm_open(shared_memory_key key, size_t size, int flag);
 137     static void*  shm_attach(shared_memory_id id, const void *ptr, int flag);
 138     static int shm_detach (void*);
 139     static int shmctl(int shmid, int cmd);
 140     static double floor(double val);
 141     static sighandler_t signal(int signum, sighandler_t handler);
 142
 143     static int gettimeofday(struct timeval *tp);
 144     static struct tm* localtime(long *secs);
 145     static pid_t getpid();
 146     static pthread_t getthrid();
 147     static char* getenv(const char *envVarName);
 148     static int setenv(const char *envVarName, const char *value);
 149
 150     static int kill(pid_t pid, int sig);
 151     static bool atobool(char *value);
 152     static pid_t createProcess(const char* cmdName, const char *arg0, ...);
 153     static pid_t fork();
 154     static size_t send(int fd, const void *buf, size_t len, int flags);
 155     static size_t recv(int fd, void *buf, size_t len, int flags);
 156     static int gethostname(char *hostname, size_t len);
 157 };
 158
 159 #endif