[PATCH 1/1] recv.2: equivalence to read

[PATCH 1/1] recv.2: equivalence to read

[Heinrich Schuchardt]

Describe the recv.2-read.2 and the recvfrom.2-recv.2 equivalences for
zero valued arguments.

Signed-off-by: Heinrich Schuchardt <xypron.glpk-Mmb7MZpHnFY@public.gmane.org>
---
 man2/recv.2 | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/man2/recv.2 b/man2/recv.2
index a789256..1bdeb7a 100644
--- a/man2/recv.2
+++ b/man2/recv.2
@@ -68,6 +68,26 @@ to receive data on both connectionless and connection-oriented sockets.
 This page first describes common features of all three system calls,
 and then describes the differences between the calls.
 .PP
+The only difference between
+.BR recv ()
+and
+.BR read (2)
+is the presence of
+.IR flags .
+With a zero
+.I flags
+argument,
+.BR recv ()
+is equivalent to
+.BR read (2).
+Also, the following call
+
+    recv(sockfd, buf, len, flags);
+
+is equivalent to
+
+    recvfrom(sockfd, buf, len, flags, NULL, NULL);
+.PP
 All three calls return the length of the message on successful
 completion.
 If a message is too long to fit in the supplied buffer, excess
-- 
2.1.4

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Re: [PATCH 1/1] recv.2: equivalence to read

[Michael Kerrisk (man-pages)]

On 01/08/2016 10:02 PM, Heinrich Schuchardt wrote:
> Describe the recv.2-read.2 and the recvfrom.2-recv.2 equivalences for
> zero valued arguments.

Thanks, Heinrich. Applied.

Cheers,

Michael


> Signed-off-by: Heinrich Schuchardt <xypron.glpk-Mmb7MZpHnFY@public.gmane.org>
> ---
>  man2/recv.2 | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/man2/recv.2 b/man2/recv.2
> index a789256..1bdeb7a 100644
> --- a/man2/recv.2
> +++ b/man2/recv.2
> @@ -68,6 +68,26 @@ to receive data on both connectionless and connection-oriented sockets.
>  This page first describes common features of all three system calls,
>  and then describes the differences between the calls.
>  .PP
> +The only difference between
> +.BR recv ()
> +and
> +.BR read (2)
> +is the presence of
> +.IR flags .
> +With a zero
> +.I flags
> +argument,
> +.BR recv ()
> +is equivalent to
> +.BR read (2).
> +Also, the following call
> +
> +    recv(sockfd, buf, len, flags);
> +
> +is equivalent to
> +
> +    recvfrom(sockfd, buf, len, flags, NULL, NULL);
> +.PP
>  All three calls return the length of the message on successful
>  completion.
>  If a message is too long to fit in the supplied buffer, excess
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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