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Document POSIX stupidity: Attempts to mmap zero bytes will succeed (and

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have no effect), while attempts to munmap zero bytes will fail.
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cperciva 2004-04-18 23:36:45 +00:00
parent ab7a6b9362
commit c8b8f2e516
1 changed files with 7 additions and 0 deletions
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7
lib/libc/sys/mmap.2
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@ -363,3 +363,10 @@ the file system code that causes the limit to be further restricted to
.Pp .Pp
Another reason for the 2GB limit is that file system metadata can Another reason for the 2GB limit is that file system metadata can
reside at negative offsets. reside at negative offsets.
.Pp
Note that an attempt to
.Fn mmap
zero bytes has no effect and succeeds, while an attempt to
.Fn munmap
zero bytes will return
.Bq Er EINVAL .