_CODE_ACCESS off_t lseek(int llv_fd, off_t offset, int origin) { off_t result; if (llv_fd < 0 || llv_fd >= _NSTREAM) return -1; /*------------------------------------------------------------------------*/ /* CALL FUNCTION FROM DEVICE TABLE TO PERFORM LSEEK FOR THIS DEVICE/FILE */ /*------------------------------------------------------------------------*/ if (_stream[llv_fd].dev == NULL) { __TI_data_synch_INV(&_stream[llv_fd], sizeof(_stream[llv_fd])); return -1; } else result = (*(_stream[llv_fd].dev->LSEEK)) (_stream[llv_fd].dfd, offset, origin); /*------------------------------------------------------------------------*/ /* Invalidate both the device table entry that was referenced and the */ /* stream table entry associated with the input file descriptor (llv_fd). */ /* It is possible (though unlikely) that the contents of the device table */ /* entry and/or the stream table entry could be updated by another thread */ /* before this thread accesses either of those objects again. */ /*------------------------------------------------------------------------*/ __TI_data_synch_INV(_stream[llv_fd].dev, sizeof(_DEVICE)); __TI_data_synch_INV(&_stream[llv_fd], sizeof(_stream[llv_fd])); return result; }
_CODE_ACCESS int rename(const char *old_name, const char *new_name) { _DEVICE *old_dev, *new_dev; int result; /*------------------------------------------------------------------------*/ /* CRITICAL REGION PROTECTS _device[] ACCESS THAT OCCURS IN getdevice() */ /* (see file header comment for more on mutex and data coherence). */ /*------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_DEVICE_TBL); old_dev = getdevice(&old_name); new_dev = getdevice(&new_name); /*------------------------------------------------------------------------*/ /* IF THE DEVICES ARE NOT THE SAME, RENAME WOULD REQUIRE A FILE COPY. */ /*------------------------------------------------------------------------*/ if (old_dev != new_dev) { __TI_data_synch_INV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return -1; } /*------------------------------------------------------------------------*/ /* CALL FUNCTION FROM DEVICE TABLE TO PERFORM RENAME FOR THIS DEVICE/FILE */ /*------------------------------------------------------------------------*/ result = (*(old_dev->RENAME)) (old_name, new_name); __TI_data_synch_INV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return result; }
_CODE_ACCESS int close(int llv_fd) { int result; #if defined(__TI_SHARED_DATA_SYNCHRONIZATION) _DEVICE *dev_ptr = NULL; #endif if (llv_fd < 0 || llv_fd >= _NSTREAM) return -1; /*------------------------------------------------------------------------*/ /* CALL FUNCTION FROM DEVICE TABLE TO PERFORM CLOSE FOR THIS DEVICE/FILE */ /* CLEAR STREAM TABLE ENTRY AND DEVICE FLAGS */ /*------------------------------------------------------------------------*/ /* CRITICAL REGION PROTECTS ACCESS TO _stream[] (see file header comment).*/ /*------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_STREAM_TBL); if (_stream[llv_fd].dev == NULL) { __TI_data_synch_INV(&_stream[llv_fd], sizeof(_stream[llv_fd])); __TI_resource_unlock(__TI_LOCK_STREAM_TBL); return -1; } /*------------------------------------------------------------------------*/ /* We'll need to invalidate the device table entry that has the address */ /* of the CLOSE function in it, so hold on to its address. We guard the */ /* definition of dev_ptr here to avoid a "set but never refed" compile */ /* time error when building the RTS in a config that doesn't have shared */ /* data synchronization turned on. */ /*------------------------------------------------------------------------*/ #if defined(__TI_SHARED_DATA_SYNCHRONIZATION) dev_ptr = _stream[llv_fd].dev; #endif if ( (result = (*(_stream[llv_fd].dev->CLOSE))(_stream[llv_fd].dfd)) != -1 ) { _stream[llv_fd].dev->flags &= ~_BUSY; _stream[llv_fd].dev = NULL; } /*------------------------------------------------------------------------*/ /* Invalidate both the device table entry that was referenced and the */ /* stream table entry associated with the input file descriptor (llv_fd). */ /* It is possible (though unlikely) that the contents of the device table */ /* entry and/or the stream table entry could be updated by another thread */ /* before this thread accesses either of those objects again. */ /*------------------------------------------------------------------------*/ /* For the address of the device table entry, we use a copy of */ /* _stream[llv_fd].dev (dev_ptr) that was made before _stream[llv_fd].dev */ /* gets modified in the above if block. */ /*------------------------------------------------------------------------*/ __TI_data_synch_INV(dev_ptr, sizeof(_DEVICE)); __TI_data_synch_WBINV(&_stream[llv_fd], sizeof(_stream[llv_fd])); __TI_resource_unlock(__TI_LOCK_STREAM_TBL); return result; }
_CODE_ACCESS int remove_device(char *name) { _DEVICE *ptr; /*-------------------------------------------------------------------------*/ /* FIND RECORD AND SET NAME TO NULL */ /*-------------------------------------------------------------------------*/ /* CRITICAL REGION PROTECTS ACCESS TO _device[] */ /*-------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_DEVICE_TBL); if (!(ptr = finddevice(name))) { __TI_data_synch_INV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return -1; } ptr->name[0] = '\0'; __TI_data_synch_WBINV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return 0; }
_CODE_ACCESS int fprintf(FILE *_fp, const char *_format, ...) { va_list _ap; int rval; char *fptr = (char *)_format; /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp may be updated, so we must */ /* ensure that the local copy of _fp is flushed to shared memory before */ /* leaving the critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); /*------------------------------------------------------------------------*/ /* If the current stream is not associated with a file, return an error. */ /*------------------------------------------------------------------------*/ if (_fp->fd == -1) { __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (-1); } va_start(_ap, _format); rval = __TI_printfi(&fptr, _ap, (void *)_fp, _outc, _outs); va_end(_ap); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (rval); }
_CODE_ACCESS int vprintf(const char *_format, va_list _ap) { int result; char *fptr = (char *)_format; /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to stdout. In this case, stdout may be updated, so we must ensure that */ /* the local copy of stdout is flushed to shared memory before leaving the*/ /* critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(stdout); /*------------------------------------------------------------------------*/ /* If the current stream is not associated with a file, return an error. */ /*------------------------------------------------------------------------*/ if (stdout->fd == -1) { __TI_data_synch_INV(stdout, sizeof(FILE)); __TI_file_unlock(stdout); return (EOF); } result = (__TI_printfi(&fptr, _ap, (void *)stdout, _outc, _outs)); __TI_data_synch_WBINV(stdout, sizeof(FILE)); __TI_file_unlock(stdout); return (result); }
_CODE_ACCESS void __TI_buff_read(FILE *_fp) { /*------------------------------------------------------------------------*/ /* Local variables */ /*------------------------------------------------------------------------*/ int errchk, j, buffer_size = _fp->bufend - _fp->buf; /*------------------------------------------------------------------------*/ /* If this is a line buffered stream, flush all line buffered streams. */ /* The current thread in a multi-threaded application must protect access */ /* to __TI_LOCK_FILE_TBL shared resources (_ftable[] and __TI_ft_end) and */ /* each file stream that is flushed. Ensure that the local copy of */ /* _ftable[] is flushed to shared memory and the local copy of */ /* __TI_ft_end is invalidated before leaving the critical section. */ /*------------------------------------------------------------------------*/ if (_BUFFMODE(_fp) == _IOLBF) { __TI_resource_lock(__TI_LOCK_FILE_TBL); for (j=0; j < __TI_ft_end; j++) if (_BUFFMODE(&_ftable[j]) == _IOLBF) { __TI_file_lock(&_ftable[j]); __TI_doflush(&_ftable[j]); __TI_data_synch_WBINV(&_ftable[j], sizeof(FILE)); __TI_file_unlock(&_ftable[j]); } __TI_data_synch_WBINV(&_ftable, sizeof(_ftable)); __TI_data_synch_INV(&__TI_ft_end, sizeof(__TI_ft_end)); __TI_resource_unlock(__TI_LOCK_FILE_TBL); } /*------------------------------------------------------------------------*/ /* Read in the next characters from the file. */ /*------------------------------------------------------------------------*/ errchk = read(_fp->fd, (char *)_fp->buf, buffer_size); /*------------------------------------------------------------------------*/ /* Adjust the buffer pointers. */ /*------------------------------------------------------------------------*/ _fp->buff_stop = _fp->buf + errchk; _fp->pos = _fp->buf; /*------------------------------------------------------------------------*/ /* Set any error flags if necessary. */ /*------------------------------------------------------------------------*/ switch (errchk) { case -1 : _SET(_fp, _STATERR); break; case 0 : _SET(_fp, _STATEOF); break; } return; }
_CODE_ACCESS int fflush(register FILE *_fp) { int result = 0; /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to __TI_LOCK_FILE_TBL shared resources (_ftable[], __TI_ft_end, init */ /* and __TI_cleanup_ptr. init is a static local in __TI_search_fp() in */ /* fopen.c). In this case, __TI_doflush will update the specified file */ /* streams, so we must also protect access to the streams. */ /* The below loop will cache a local copy of _ftable[] and __TI_ft_end. */ /* Ensure that the local copy of _ftable[] and each flushed file stream */ /* is flushed to shared memory and the local copy of __TI_ft_end is */ /* invalidated before leaving the critical section. */ /*------------------------------------------------------------------------*/ /*------------------------------------------------------------------------*/ /* If _fp is not a NULL pointer, call __TI_doflush for that stream. */ /* Otherwise, call __TI_doflush for all file streams in the table that are*/ /* active. */ /*------------------------------------------------------------------------*/ if (_fp) { __TI_file_lock(_fp); result = __TI_doflush(_fp); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); } else { int index; __TI_resource_lock(__TI_LOCK_FILE_TBL); for(index = 0; index < __TI_ft_end; index++) if(_ftable[index].fd != -1) { __TI_file_lock(&_ftable[index]); result |= __TI_doflush(&_ftable[index]); __TI_data_synch_WBINV(&_ftable[index], sizeof(_ftable[index])); __TI_file_unlock(&_ftable[index]); } __TI_data_synch_WBINV(&_ftable, sizeof(_ftable)); __TI_data_synch_INV(&__TI_ft_end, sizeof(__TI_ft_end)); __TI_resource_unlock(__TI_LOCK_FILE_TBL); } return (result); }
_CODE_ACCESS int feof(FILE *_fp) { int result; /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp is accessed (but not modified), */ /* so ensure that the local copy of _fp is invalidated before leaving the */ /* the critical section. */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); result = (((_fp)->flags & _STATEOF)); __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (result); }
_CODE_ACCESS int fseek(register FILE *_fp, long _offset, int _ptrname) { /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp may be updated, so we must */ /* ensure that the local copy of _fp is flushed to shared memory before */ /* leaving the critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); /*------------------------------------------------------------------------*/ /* If the current stream is not associated with a file, return an error. */ /*------------------------------------------------------------------------*/ if (_fp->fd == -1) { __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } /*------------------------------------------------------------------------*/ /* When positioning to a location relative to the current location, */ /* adjust for the fact that there may be something in the buffer. */ /*------------------------------------------------------------------------*/ if(_ptrname == SEEK_CUR && _STCHK(_fp, _MODER) && _fp->pos) _offset -= (_fp->buff_stop - _fp->pos); __TI_doflush(_fp); _UNSET(_fp, (_STATEOF | _UNGETC)); if ((lseek(_fp->fd, _offset, _ptrname)) == -1) { __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (0); }
_CODE_ACCESS int unlink(const char *path) { _DEVICE *dev; int result; /*------------------------------------------------------------------------*/ /* GET A DEVICE AND CALL FUNCTION FROM DEVICE TABLE TO PERFORM UNLINK */ /* FOR THIS DEVICE/FILE */ /*------------------------------------------------------------------------*/ /* CRITICAL REGION PROTECTS _device[] ACCESS THAT OCCURS IN getdevice() */ /* (see file header comment for more on mutex and data coherence). */ /*------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_DEVICE_TBL); dev = getdevice(&path); result = (*(dev->UNLINK)) (path); __TI_data_synch_INV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return result; }
_CODE_ACCESS int fputs(const char *_ptr, register FILE *_fp) { /*------------------------------------------------------------------------*/ /* Local variables */ /*------------------------------------------------------------------------*/ size_t num_left, ptr_strlen; char *fpos = (char *)_ptr; int room_left, flush_flag = 0, num_to_write; /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp may be updated, so we must */ /* ensure that the local copy of _fp is flushed to shared memory before */ /* leaving the critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); /*------------------------------------------------------------------------*/ /* Make sure that the stream is writeable. */ /*------------------------------------------------------------------------*/ if (!__TI_wrt_ok(_fp)) { __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } room_left = (int)(_fp->bufend - _fp->pos); ptr_strlen = num_left = strlen(_ptr); /*------------------------------------------------------------------------*/ /* If the stream is non-buffered, call the lowlevel WRITE function. */ /*------------------------------------------------------------------------*/ if (_BUFFMODE(_fp) == _IONBF) { int num_written = 0; while (num_left > 0) { int write_return = write(_fp->fd, _ptr + num_written, num_left); if (write_return < 0) { _SET(_fp, _STATERR); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } else { num_written += write_return; num_left -= write_return; } } __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return ptr_strlen; } /*------------------------------------------------------------------------*/ /* Write the string into the buffer, flushing it when full. */ /*------------------------------------------------------------------------*/ while (num_left > 0) { num_to_write = (num_left > room_left) ? room_left : num_left; if ((_BUFFMODE(_fp) == _IOLBF) && memchr(fpos, '\n', num_to_write)) { num_to_write = (char *)memchr(fpos, '\n', num_to_write) - fpos + 1; flush_flag = 1; } memcpy(_fp->pos, fpos, num_to_write); /*---------------------------------------------------------------------*/ /* Update pointers and counters. */ /*---------------------------------------------------------------------*/ _fp->pos += num_to_write; fpos += num_to_write; num_left -= num_to_write; room_left -= num_to_write; /*---------------------------------------------------------------------*/ /* If the buffer is full, flush it. Any I/O errors cause this */ /* function to exit, returning an EOF. */ /*---------------------------------------------------------------------*/ if (room_left == 0 || flush_flag) { if (__TI_doflush(_fp)) { _SET(_fp, _STATERR); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } room_left = (int)(_fp->bufend - _fp->pos); _SET(_fp, _MODEW); flush_flag = 0; } } __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return ptr_strlen; }
_CODE_ACCESS int fputc(int _c, register FILE *_fp) { /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp may be updated, so we must */ /* ensure that the local copy of _fp is flushed to shared memory before */ /* leaving the critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); /*------------------------------------------------------------------------*/ /* Make sure that the stream is writeable. */ /*------------------------------------------------------------------------*/ if (!__TI_wrt_ok(_fp)) { __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return EOF; } /*------------------------------------------------------------------------*/ /* If the stream is non-buffered, call the lowlevel WRITE function. */ /*------------------------------------------------------------------------*/ if(_BUFFMODE(_fp) == _IONBF) { char cbuf = (char)_c; if ((write(_fp->fd, &cbuf, 1)) == -1) { _SET(_fp, _STATERR); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } else { __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return ((unsigned char)_c); } } /*------------------------------------------------------------------------*/ /* Check for room in the buffer. If room, add the character. Must */ /* check before writing because C++ library fills the buffer to */ /* capacity, then calls fputc() from overflow() (CQXXXXX). */ /*------------------------------------------------------------------------*/ if ((_fp->pos >= _fp->bufend) && __TI_doflush(_fp)) { _SET(_fp, _STATERR); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } *(_fp->pos++) = (unsigned char)_c; /*------------------------------------------------------------------------*/ /* If a line-buffered stream reached a newline character, flush it. */ /*------------------------------------------------------------------------*/ if ((_STCHK(_fp, _IOLBF) && _c == '\n') && __TI_doflush(_fp)) { _SET(_fp, _STATERR); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return ((unsigned char)_c); }
_CODE_ACCESS size_t fread(void *_ptr, size_t _size, size_t _count, FILE *_fp) { /*------------------------------------------------------------------------*/ /* Local variables */ /*------------------------------------------------------------------------*/ unsigned char *fpos = (unsigned char *)_ptr; size_t num_left = _size * _count, num_read = 0, num_to_read = 0; /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp may be updated, so we must */ /* ensure that the local copy of _fp is flushed to shared memory before */ /* leaving the critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); /*------------------------------------------------------------------------*/ /* Make sure that the file is readable. */ /*------------------------------------------------------------------------*/ if (!__TI_rd_ok(_fp) || _size == 0 || _count == 0) { __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (0); } /*------------------------------------------------------------------------*/ /* If the stream is non-buffered, call the lowlevel READ function. */ /*------------------------------------------------------------------------*/ if (_BUFFMODE(_fp) == _IONBF) { int num_read = 0; while (num_left > 0) { int read_return; if (_STCHK(_fp, _UNGETC)) { *fpos = *(_fp->pos++); _UNSET(_fp, _UNGETC); read_return = 1; } else read_return = (size_t)(read(_fp->fd, (char *)fpos + num_read, num_left)); if (read_return < 0) { _SET(_fp, _STATERR); break; } else if (read_return == 0) { _SET(_fp, _STATEOF); break; } else { num_read += read_return; num_left -= read_return; } } __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (num_read / _size); } while (num_left > 0) { /*---------------------------------------------------------------------*/ /* If the buffer has been completely read, fill it up. Exit the loop */ /* if an I/O error occurs, or the end of the file is reached. */ /*---------------------------------------------------------------------*/ if(_fp->pos == _fp->buff_stop) __TI_buff_read(_fp); if(_STCHK(_fp, (_STATERR | _STATEOF))) break; /*---------------------------------------------------------------------*/ /* Determine how many characters can fit in the buffer, and read them */ /* in. */ /*---------------------------------------------------------------------*/ num_to_read = (num_left < (_fp->buff_stop - _fp->pos)) ? num_left : (_fp->buff_stop - _fp->pos); memcpy(fpos, _fp->pos, num_to_read); /*---------------------------------------------------------------------*/ /* Update pointers and counters. */ /*---------------------------------------------------------------------*/ fpos += num_to_read; _fp->pos += num_to_read; num_read += num_to_read; num_left -= num_to_read; } /*------------------------------------------------------------------------*/ /* Clear the _UNGETC flag in the stream, and return the number of blocks */ /* read. */ /*------------------------------------------------------------------------*/ _UNSET(_fp, _UNGETC); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (num_read / _size); }
_CODE_ACCESS size_t fwrite(const void *_ptr, size_t _size, size_t _count, register FILE *_fp) { /*------------------------------------------------------------------------*/ /* Local variables */ /*------------------------------------------------------------------------*/ unsigned char *fpos = (unsigned char *)_ptr; unsigned char *nl_pos; size_t buffer_size, next_nl, room_left; size_t num_left = _size * _count, num_to_write, num_written = 0; /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp may be updated, so we must */ /* ensure that the local copy of _fp is flushed to shared memory before */ /* leaving the critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); /*------------------------------------------------------------------------*/ /* Make sure that the stream is writeable. */ /*------------------------------------------------------------------------*/ buffer_size = (_fp->bufend - _fp->buf); if (!__TI_wrt_ok(_fp) || _size == 0 || _count == 0) { __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (0); } /*------------------------------------------------------------------------*/ /* If the stream is non-buffered, call the lowlevel WRITE function. */ /*------------------------------------------------------------------------*/ if(_BUFFMODE(_fp) == _IONBF) { int num_written = 0; while (num_left > 0) { int write_return = write(_fp->fd, (char *)fpos + num_written, num_left); if (write_return <= 0) { _SET(_fp, _STATERR); break; } else { num_written += write_return; num_left -= write_return; } } __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (num_written / _size); } room_left = (_fp->bufend - _fp->pos); if (_STCHK(_fp, _IOLBF)) next_nl = (char *)memchr(fpos, '\n', num_left) - (char *)fpos + 1; while (num_left > 0) { /*---------------------------------------------------------------------*/ /* Determine how many characters should be written based on buffering */ /* mode. For non-buffered streams, call the lowlevel WRITE function. */ /* For fully buffered streams, put as many characters in the buffer as */ /* possible. For line buffered streams, put characters into the */ /* util the buffer is full, the last character is reached, or a */ /* newline character is reached. */ /*---------------------------------------------------------------------*/ switch (_BUFFMODE(_fp)) { case _IOFBF : num_to_write = (room_left > num_left) ? num_left : room_left; break; case _IOLBF : num_to_write = (room_left > next_nl) ? next_nl : (room_left > num_left) ? num_left : room_left; break; /*------------------------------------------------------------------*/ /* The only other available _BUFFMODE for _fp is _IONBF which has */ /* already been accounted for above. We should never get here. */ /*------------------------------------------------------------------*/ default : return (0); } /*---------------------------------------------------------------------*/ /* Write the data to the buffer, and update the buffer pointer and the */ /* ROOM_LEFT coutner. */ /*---------------------------------------------------------------------*/ memcpy(_fp->pos, fpos, num_to_write); _fp->pos += num_to_write; room_left = (_fp->bufend - _fp->pos); /*---------------------------------------------------------------------*/ /* If the buffer is full, or a newline character has been encountered */ /* on a line-buffered stream, flush it. */ /*---------------------------------------------------------------------*/ if (room_left == 0 || (_STCHK(_fp, _IOLBF) && num_to_write == next_nl)) { if (__TI_doflush(_fp)) { _SET(_fp, _STATERR); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (num_written / _size); } room_left = buffer_size; /*------------------------------------------------------------------*/ /* The _DOFLUSH function clears the write flag on streams opened in */ /* update mode. Make sure that the write flag is still set here. */ /*------------------------------------------------------------------*/ _SET(_fp, _MODEW); } /*---------------------------------------------------------------------*/ /* Update pointers and counters. */ /*---------------------------------------------------------------------*/ num_written += num_to_write; fpos += num_to_write; num_left -= num_to_write; /*---------------------------------------------------------------------*/ /* For line-buffered streams, find the next occurance of a newline */ /* character. If there are no more, and the remaining data will fit */ /* in the buffer, exit the loop where the remaining data will be moved */ /* there. Otherwise loop until this condition is true. */ /*---------------------------------------------------------------------*/ if (_STCHK(_fp, _IOLBF)) { nl_pos = (unsigned char *)memchr((fpos + 1), '\n', (num_left > 0) ? (num_left-1) : 0); if (! nl_pos) { if (num_left < room_left) break; else next_nl = buffer_size + 1; } else next_nl = (nl_pos - fpos) + 1; } } /*------------------------------------------------------------------------*/ /* Copy the rest of the characters into the buffer for line-buffered */ /* streams. */ /*------------------------------------------------------------------------*/ if (_STCHK(_fp, _IOLBF)) { memcpy(_fp->pos, fpos, num_left); num_written += num_left; _fp->pos += num_left; } __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (num_written / _size); }
_CODE_ACCESS int add_device(char *name, unsigned flags, int (*dopen) (const char *path, unsigned flags, int llv_fd), int (*dclose) (int dev_fd), int (*dread) (int dev_fd, char *buf, unsigned count), int (*dwrite) (int dev_fd, const char *buf, unsigned count), off_t (*dlseek) (int dev_fd, off_t offset, int origin), int (*dunlink)(const char *path), int (*drename)(const char *old_name, const char *new_name)) { static _DATA_ACCESS int device_init = 0; _DEVICE *dt; /*-------------------------------------------------------------------------*/ /* CRITICAL REGION PROTECTS ACCESS TO _device[] */ /*-------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_DEVICE_TBL); /*-------------------------------------------------------------------------*/ /* INITIALIZE DEVICE TABLE FIRST TIME AROUND */ /*-------------------------------------------------------------------------*/ if (!device_init) { for (device_init = 1, dt = &_device[1]; dt != &_device[_NDEVICE]; *(dt++)->name = '\0'); __TI_data_synch_WBINV(&device_init, sizeof(device_init)); } /*-------------------------------------------------------------------------*/ /* IF DEVICE WITH SPECIFIED 'name' ALREADY EXISTS IN _device[], THEN WE */ /* CAN'T ADD A NEW ONE WITH THE SAME NAME (note that the function pointers */ /* associated with the existing device are not updated). */ /*-------------------------------------------------------------------------*/ if (finddevice(name)) { __TI_data_synch_INV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return 1; } /*-------------------------------------------------------------------------*/ /* SEARCH THE DEVICE TABLE FOR AN EMPTY SLOT, RETURN -1 IF NONE FOUND */ /*-------------------------------------------------------------------------*/ for (dt = &_device[1]; dt != _device+_NDEVICE && dt->name[0] != '\0'; ++dt); if (dt == &_device[_NDEVICE]) { __TI_data_synch_INV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return -1; } strncpy(dt->name,name,8); dt->name[8] = '\0'; dt->flags = flags; dt->OPEN = dopen; dt->CLOSE = dclose; dt->READ = dread; dt->WRITE = dwrite; dt->LSEEK = dlseek; dt->UNLINK = dunlink; dt->RENAME = drename; __TI_data_synch_WBINV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); return 0; }
_CODE_ACCESS int setvbuf(register FILE *_fp, register char *_buf, register int _type, register size_t _size) { /*------------------------------------------------------------------------*/ /* The current thread in a multi-threaded application must protect access */ /* to the file stream. In this case, _fp may be updated, so we must */ /* ensure that the local copy of _fp is flushed to shared memory before */ /* leaving the critical section (invalidated if it is not modified). */ /*------------------------------------------------------------------------*/ __TI_file_lock(_fp); /*------------------------------------------------------------------------*/ /* If the current stream is not associated with a file, return an error. */ /*------------------------------------------------------------------------*/ if (_fp->fd == -1 || (_type != _IONBF && _size <= 0)) { __TI_data_synch_INV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } /*------------------------------------------------------------------------*/ /* If a buffer already exists, free it if it was malloc'd, and reset all */ /* of the stream's buffer pointers. */ /*------------------------------------------------------------------------*/ if (_fp->buf) { if(_STCHK(_fp, _BUFFALOC)) free((_fp->buf)-1); _UNSET(_fp, _BUFFALOC); _fp->buf = NULL; _fp->pos = NULL; _fp->bufend = NULL; _fp->buff_stop = NULL; } /*------------------------------------------------------------------------*/ /* If NULL was used for the buffering mode, default to fully-buffered. */ /*------------------------------------------------------------------------*/ if (!_type) _type = _IOFBF; /*------------------------------------------------------------------------*/ /* Clear any previous buffering flags, and set the new one. */ /*------------------------------------------------------------------------*/ _UNSET(_fp, (_IOLBF | _IOFBF | _IONBF)); _SET(_fp, _type); /*------------------------------------------------------------------------*/ /* If a buffer was provided, but its size is only one byte, allocate a */ /* different one. Also, do not allow a buffer size greater than BUFSIZ. */ /* The buffer will always have one space at the beginning that is */ /* for UNGETC, in the event that an UNGETC is performed on an empty file, */ /* or when the buffer is full, but unread. */ /*------------------------------------------------------------------------*/ if (_size == 1) _buf = NULL; if (_size > BUFSIZ) _size = BUFSIZ; if (_buf) _fp->buf = (unsigned char*)_buf+1; else { /*---------------------------------------------------------------------*/ /* If allocating a buffer, provide _size bytes of usable space by */ /* incrementing _size, unless it is greater than BUFSIZ. */ /*---------------------------------------------------------------------*/ if (_size <= BUFSIZ) _size++; if (! (_fp->buf = (unsigned char*)malloc(_size))) { _SET(_fp, _STATERR); __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); return (EOF); } _fp->buf++; _SET(_fp, _BUFFALOC); } _fp->pos = _fp->buff_stop = _fp->buf; _fp->bufend = _fp->buf + _size -1; __TI_data_synch_WBINV(_fp, sizeof(FILE)); __TI_file_unlock(_fp); /*------------------------------------------------------------------------*/ /* SETUP _CLEANUP_PTR SO ALL BUFFERS WILL BE FLUSHED AT EXIT. */ /*------------------------------------------------------------------------*/ /* __TI_cleanup_ptr is also a shared resource in multi-threaded */ /* applications, so accesses to it are also protected by the */ /* __TI_LOCK_FILE_TBL mutex. The current thread will also invalidate any */ /* local copy of __TI_cleanup_ptr in the data cache of the core that it */ /* is running on before leaving the critical section. */ /*------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_FILE_TBL); __TI_cleanup_ptr = __TI_cleanup; __TI_data_synch_WBINV(&__TI_cleanup_ptr, sizeof(__TI_cleanup_ptr)); __TI_resource_unlock(__TI_LOCK_FILE_TBL); return (0); }
_CODE_ACCESS int open(const char *path, unsigned flags, int mode) { static _DATA_ACCESS int stream_init = 0; struct stream_info *ptr; _DEVICE *dev; int dev_fd; int llv_fd; /*-------------------------------------------------------------------------*/ /* CRITICAL REGION PROTECTS ACCESS TO _stream[] (see file header comment). */ /*-------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_STREAM_TBL); /*-------------------------------------------------------------------------*/ /* INITIALIZE STREAM TABLE FIRST TIME AROUND */ /*-------------------------------------------------------------------------*/ if (!stream_init) { for (stream_init = 1, ptr = &_stream[3]; ptr != &_stream[_NSTREAM]; (ptr++)->dev = NULL); __TI_data_synch_WBINV(&stream_init, sizeof(stream_init)); } /*-------------------------------------------------------------------------*/ /* GET THE NEXT AVAILABLE FILE DESCRIPTOR - RETURN -1 IF NONE AVAILABLE */ /*-------------------------------------------------------------------------*/ for (ptr = &_stream[3]; ptr != &_stream[_NSTREAM] && ptr->dev; ++ptr); if (ptr == &_stream[_NSTREAM]) { __TI_data_synch_INV(&_stream, sizeof(_stream)); __TI_resource_unlock(__TI_LOCK_STREAM_TBL); return -1; } llv_fd = ptr - &_stream[0]; /*------------------------------------------------------------------------*/ /* GET DEVICE AND PEFORM OPEN - SET STREAM TABLE ENTRY AND FLAGS */ /*------------------------------------------------------------------------*/ /* CRITICAL REGION PROTECTS _device[] ACCESS THAT OCCURS IN getdevice() */ /* (see file header comment for more on mutex and data coherence). */ /*------------------------------------------------------------------------*/ __TI_resource_lock(__TI_LOCK_DEVICE_TBL); dev = getdevice(&path); dev_fd = (dev->flags & _BUSY) ? -1 : (*(dev->OPEN))(path,flags,llv_fd); if (dev_fd < 0) { __TI_data_synch_INV(&_stream, sizeof(_stream)); __TI_data_synch_INV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); __TI_resource_unlock(__TI_LOCK_STREAM_TBL); return dev_fd; } _stream[llv_fd].dev = dev; _stream[llv_fd].dfd = dev_fd; if (!(dev->flags & _MSA)) dev->flags |= _BUSY; __TI_data_synch_WBINV(&_stream, sizeof(_stream)); __TI_data_synch_WBINV(&_device, sizeof(_device)); __TI_resource_unlock(__TI_LOCK_DEVICE_TBL); __TI_resource_unlock(__TI_LOCK_STREAM_TBL); return llv_fd; }