#if !defined(TOKU_OS_INTERFACE_H)
#define TOKU_OS_INTERFACE_H

#include <dirent.h>

#if defined(__cplusplus) || defined(__cilkplusplus)
extern "C" {
#endif

#include "toku_os_types.h"

// Returns: the current process id
int toku_os_getpid(void)   __attribute__((__visibility__("default")));

// Returns: the current thread id
int toku_os_gettid(void)  __attribute__((__visibility__("default")));

// Returns: the number of processors in the system
int toku_os_get_number_processors(void);

// Returns: the number of active processors in the system
int toku_os_get_number_active_processors(void);

// Returns: the system page size (in bytes)
int toku_os_get_pagesize(void);

// Returns: the size of physical memory (in bytes)
uint64_t toku_os_get_phys_memory_size(void) __attribute__((__visibility__("default")));

// Returns the processor frequency in Hz
// Returns 0 if success
int toku_os_get_processor_frequency(uint64_t *hz);

// Returns: 0 on success
// sets fsize to the number of bytes in a file
int toku_os_get_file_size(int fildes, int64_t *fsize)   __attribute__((__visibility__("default")));

// Returns: 0 on success
// Initializes id as a unique fileid for fildes on success.
int toku_os_get_unique_file_id(int fildes, struct fileid *id);

//Locks a file (should not be open to begin with).
//Returns: file descriptor (or -1 on error)
int toku_os_lock_file(char *name);

//Unlocks and closes a file locked by toku_os_lock_on_file
int toku_os_unlock_file(int fildes);

int toku_os_mkdir(const char *pathname, mode_t mode) __attribute__((__visibility__("default")));

// Get the current process user and kernel use times
int toku_os_get_process_times(struct timeval *usertime, struct timeval *kerneltime);

// Get the current in memory size (in bytes) of the current process
int toku_os_get_rss(int64_t *rss);

// Get the maximum in memory size (in bytes) of the current process
int toku_os_get_max_rss(int64_t *maxrss);

// Get the maximum size of the process data size (in bytes)
// Success: returns 0 and sets *maxdata to the data size
// Fail: returns an error number
int toku_os_get_max_process_data_size(uint64_t *maxdata) __attribute__((__visibility__("default")));

int toku_os_initialize_settings(int verbosity)  __attribute__((__visibility__("default")));

//
// this int acts like a bool, returns 0 for false, 1 for true
//
int toku_os_is_absolute_name(const char* path)  __attribute__((__visibility__("default")));

// Set whether or not writes assert when ENOSPC is returned or they wait for space
void toku_set_assert_on_write_enospc(int do_assert) __attribute__((__visibility__("default")));

// Get file system write information
// *enospc_last_time is the last time ENOSPC was returned by write or pwrite
// *enospc_current   is the number of threads waiting on space
// *enospc_total     is the number of times ENOSPC was returned by write or pwrite
void toku_fs_get_write_info(time_t *enospc_last_time, uint64_t *enospc_current, uint64_t *enospc_total);


int toku_fsync_dirfd_without_accounting(DIR *dirp);

int toku_fsync_dir_by_name_without_accounting(const char *dir_name);

// Get the file system free and total space for the file system that contains a path name
// *avail_size is set to the bytes of free space in the file system available for non-root 
// *free_size is set to the bytes of free space in the file system
// *total_size is set to the total bytes in the file system
// Return 0 on success, otherwise an error number
int toku_get_filesystem_sizes(const char *path, uint64_t *avail_size, uint64_t *free_size, uint64_t *total_size);

#if TOKU_WINDOWS
#include <sys/types.h>
#include <sys/stat.h>
//Test if st_mode (from stat) is a directory
#define S_ISDIR(bitvector)  (((bitvector)&_S_IFDIR)!=0)
#endif

// Portable linux 'stat'
int toku_stat(const char *name, toku_struct_stat *statbuf) __attribute__((__visibility__("default")));
// Portable linux 'fstat'
int toku_fstat(int fd, toku_struct_stat *statbuf) __attribute__((__visibility__("default")));

// Portable linux 'dup2'
int toku_dup2(int fd, int fd2) __attribute__((__visibility__("default")));

#if defined(__cplusplus) || defined(__cilkplusplus)
};
#endif

#endif