/dev/zero中的zero是什么意思？

hnwjg

不明白的，请老手指教！

werix

[quote]原帖由 "hnwjg"]不明白的，请老手指教！[/quote 发表：


from http://mkssoftware.com/docs/man5/dev_zero.5.asp

/dev/zero
zero special file
Device
SYNOPSIS DESCRIPTION AVAILABILITY SEE ALSO  

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SYNOPSIS
/dev/zero


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DESCRIPTION
The zero special file is a source of zeroed memory.

Reads from a zero special file always return a buffer full of zeroes. The file is of infinite length. Writes to a zero special file are always successful, but the data written is ignored.

Mapping a zero special file creates a zero-initialized memory object of length equal to the length of the mapping and rounded up to the nearest allocation boundary as returned by sysconf(_SC_NUTC_OS_ALLOCGRANULARITY). Multiple processes can share such a zero special file object provided a common ancestor mapped the object MAP_SHARED.


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AVAILABILITY
MKS Toolkit for Professional Developers
MKS Toolkit for Enterprise Developers



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SEE ALSO

Functions:
mmap(), sysconf()

hnwjg

谢谢！
硬着头皮看吧！

haohaoo

那位兄弟有没有/dev下面各个文件的解释