zero(7) zero(7)
NAME [Toc] [Back]
zero - zero file
DESCRIPTION [Toc] [Back]
/dev/zero is a zero special file. Reads from a zero special file
always return characters whose value is '0' (\0 characters).
Data written on a zero special file is discarded or ignored.
Seeks on a zero special file will always succeed.
Private mmap() of a zero special file is allowed (see mmap(2)).
Shared mmap() is not allowed.
EXAMPLES [Toc] [Back]
In the following example, the buffer `buf' is filled with `len' \0
characters.
fildes = open("/dev/zero",...)
read(fildes, buf, len)
In the following example, the process now has a range of `len' \0
characters at memory location `address':
fildes = open("/dev/zero",...)
address = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fildes, any_offset)
FILES [Toc] [Back]
/dev/zero
SEE ALSO [Toc] [Back]
mmap(2), null(7).
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: August 2003 [ Back ] |
