class MMapFile class MMapFile Provides efficient file I/O by mapping a file into a process address space and copying bytes between the system supplied memory and user buffers
 int | err () status (errno) of last file operation |
| off_t | lseek (off_t offset, int whence) move read/write file pointer, modeled after lseek(2) |
| | MMapFile (char *fileName, int oflag, int mode = 0664, size_t sizeBuffer = 0x0) constructor - open the specified file |
| ssize_t | read (void *buf, size_t nbyte) read 'nbyte' bytes into 'buf' |
| ssize_t | write (const void *buf, size_t nbyte) write 'nbyte' bytes from 'buf' |
| | ~MMapFile () destructor - close the file, free all resources |
| size_t | actualSize_ actual size of file |
| caddr_t | curAddr_ current location in buffer |
| int | errno_ last error encountered |
| int | fd_ file descriptor |
| size_t | fileSize_ size of file, which could be larger than actualSize, |
| caddr_t | mapAddr_ mapping address |
| size_t | mapSize_ size of memory map |
| int | mode_ open-ing mode for file |
| off_t | offset_ current offset into file |
| int | oflag_ open-ing oflag for file |
| void | cleanup () perform cleanup after error |
Provides efficient file I/O by mapping a file into a process address space and copying bytes between the system supplied memory and user buffers. (The overhead for memcpy() is small compared to the cost of the read()/write() calls we avoid.)
MMapFile(char *fileName, int oflag, int mode = 0664, size_t sizeBuffer = 0x0)
~MMapFile()
int err()
ssize_t read(void *buf, size_t nbyte)
ssize_t write(const void *buf, size_t nbyte)
off_t lseek(off_t offset, int whence)
void cleanup()
int errno_
int fd_
off_t offset_
caddr_t mapAddr_
caddr_t curAddr_
size_t mapSize_
size_t fileSize_
size_t actualSize_
this page has been generated automatically by doc++
(c)opyright by Malte Zöckler, Roland Wunderling
contact: doc++@zib.de