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db_env_set_func_ftruncate |
#include <db.h>int db_env_set_func_ftruncate(int (*func_ftruncate)(int fd, off_t offset));
The Berkeley DB library requires the ability to truncate a file.
The db_env_set_func_ftruncate method configures all operations performed by a process and all of its threads of control, not operations confined to a single database environment.
Although the db_env_set_func_ftruncate method may be called at any time during the life of the application, it should normally be called before making calls to the db_env_create or db_create methods.
The db_env_set_func_ftruncate method returns a non-zero error value on failure and 0 on success.
The fd parameter is an open file descriptor on the file.
The ftruncate function must truncate the file to the byte length specified by the offset parameter.
The func_ftruncate function must return the value of errno on failure and 0 on success.
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