Date: Mon, 3 Mar 2025 16:56:54 GMT From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: a088781bc36d - stable/14 - nv.9: Add a new subsection documenting kernel-specific behavior Message-ID: <202503031656.523GusO0083575@gitrepo.freebsd.org>
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The branch stable/14 has been updated by jhb: URL: https://cgit.FreeBSD.org/src/commit/?id=a088781bc36d6a4aba053c3a94f810fec9d9f899 commit a088781bc36d6a4aba053c3a94f810fec9d9f899 Author: John Baldwin <jhb@FreeBSD.org> AuthorDate: 2025-01-03 15:51:51 +0000 Commit: John Baldwin <jhb@FreeBSD.org> CommitDate: 2025-03-03 16:56:20 +0000 nv.9: Add a new subsection documenting kernel-specific behavior Reviewed by: emaste Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D48257 (cherry picked from commit ecb5fe3c5e483e09544645ba84281b4a8cba4edf) --- share/man/man9/nv.9 | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/share/man/man9/nv.9 b/share/man/man9/nv.9 index 4e4542c146ef..8c99f1d12200 100644 --- a/share/man/man9/nv.9 +++ b/share/man/man9/nv.9 @@ -859,7 +859,7 @@ If no element named .Fa name with the appropriate type exists, the program aborts. The nvlist must not be in the error state. -.Sh NOTES +.Ss Notes The .Fn nvlist_pack and @@ -873,6 +873,36 @@ The and .Fn nvlist_xfer functions can transfer nvlists between hosts with different endianness. +.Ss Kernel Considerations +The +.Nm nv , +.Nm cnv , +and +.Nm dnv +APIs can be used in the kernel with the following differences: +.Bl -bullet +.It +File descriptor and file descriptor array value types are not supported. +.It +.Fn nvlist_recv , +.Fn nvlist_send , +and +.Fn nvlist_xfer +are not supported. +.It +All memory allocations use the +.Dv M_NVLIST +memory type with +.Xr malloc 9 +and +.Xr free 9 . +As a result, any allocated buffers moved into an nvlist must be allocated with +.Dv M_NVLIST , +and buffers returned by functions such as +.Fn nvlist_pack +must be freed with +.Dv M_NVLIST . +.El .Sh EXAMPLES The following example demonstrates how to prepare an nvlist and send it over a .Xr unix 4
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