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recv.2: Explain how recv functions can return 0

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Clarify the RETURN VALUES section with improved structure,
the condition of the return value 0, and the setting of errno.

PR:			174581
Reviewed by:		jhb, ziaee
Approved by:		mhorne (mentor)
Differential Revision:	https://reviews.freebsd.org/D48955
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Felix Johnson 2025-02-12 22:40:59 -05:00 committed by Alexander Ziaee
parent 6156da866e
commit 571df2c64a
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1 changed files with 10 additions and 3 deletions
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13
lib/libsys/recv.2
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@ -316,12 +316,19 @@ On data reception the
.Fa msg_len
field is updated to the length of the received message.
.Sh RETURN VALUES
These calls except
.Fn recvmmsg
On successful completion,
.Fn recv ,
.Fn recvfrom ,
and
.Fn recvmsg
return the number of bytes received.
.Fn recvmmsg
returns the number of messages received.
A value of -1 is returned if an error occurred.
If no messages are available to be received and the peer has
performed an orderly shutdown, 0 is returned.
Otherwise, -1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
The calls fail if:
.Bl -tag -width Er