Re: [PATCH 1/1] recv.2: equivalence to read
From: Michael Kerrisk (man-pages) <hidden>
Date: 2016-01-17 07:03:00
Possibly related (same subject, not in this thread)
- 2016-01-08 · [PATCH 1/1] recv.2: equivalence to read · Heinrich Schuchardt <hidden>
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
quoted hunk
Signed-off-by: Heinrich Schuchardt <redacted> --- 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
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