# DBENV->set_func_read |

`

###

    #include <db.h>

    int
    DBENV->set_func_read(DB_ENV *dbenv,
        ssize_t (*func_read)(int fd, void *buf, size_t nbytes));

# Description

Replace Berkeley DB calls to the IEEE/ANSI Std 1003.1 (POSIX) read function with func_read, which must conform to the standard interface.

The DBENV->set_func_read interface affects the entire application, not only the environment in which it is called.

The DBENV->set_func_read interface may only be used to configure Berkeley DB before the DBENV->open interface is called.

The DBENV->set_func_read function returns a non-zero error value on failure and 0 on success.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

  Called after DBENV->open was called.

# See Also

DBENV->set_func_close, DBENV->set_func_dirfree, DBENV->set_func_dirlist, DBENV->set_func_exists, DBENV->set_func_free, DBENV->set_func_fsync, DBENV->set_func_ioinfo, DBENV->set_func_malloc, DBENV->set_func_map, DBENV->set_func_open, DBENV->set_func_read, DBENV->set_func_realloc, DBENV->set_func_seek, DBENV->set_func_sleep, DBENV->set_func_unlink, DBENV->set_func_unmap, DBENV->set_func_write and DBENV->set_func_yield.`

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