Document that sendfile
will return an invalid value for sbytes
if provided an invalid address
This is meant to clarify the fact that the system call will not fail with -1/EFAULT, as one might expect, when reading the sendfile(2) manpage today. While here, pet the mandoc linter, when dealing with the section that describes valid values for `flags`. PR: 232210 MFC after: 2 weeks Approved by: emaste (mentor) Reviewed by: glebius, 0mp Differential Revision: https://reviews.freebsd.org/D18949
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=343444
@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 12, 2018
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.Dd January 25, 2019
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.Dt SENDFILE 2
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.Os
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.Sh NAME
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@ -104,7 +104,7 @@ variable pointed to by
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The least significant 16 bits of
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.Fa flags
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argument is a bitmap of these values:
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.Bl -tag -offset indent
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.Bl -tag -offset indent -width "SF_USER_READAHEAD"
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.It Dv SF_NODISKIO
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This flag causes
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.Nm
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@ -403,3 +403,14 @@ The
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.Fx 11
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implementation was written by
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.An Gleb Smirnoff Aq Mt glebius@FreeBSD.org .
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.Sh BUGS
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The
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.Fn sendfile
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system call will not fail, i.e., return
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.Dv -1
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and set
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.Va errno
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to
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.Er EFAULT ,
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if provided an invalid address for
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.Fa sbytes .
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