Re: Draft manpage for recvmmsg

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[CC list expanded]

Hi Andi, (and Arnaldo)

As noted in an earlier mail, I still need to know what copyright and
license to attach to the page before I can release it.

See below for further comments.

On Tue, Nov 23, 2010 at 11:15 AM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
>
> Here's a draft manpage for recvmmsg(2), which is one
> of the last undocumented syscalls currently.
> Please review and comment.
>
> -Andi
>
>
> .TH RECVMMSG 2 2010-11-23 "Linux" "Linux Programmer's Manual"
> .SH NAME
> recvmmsg \- receive multiple messages on a socket
> .SH SYNOPSIS
> .BI "#include <sys/socket.h>"
> .br
> .BI "int recvmmsg(int " fd ", struct mmsghdr *" mmsghdr \
> ", unsigned int " vlen ","
> .br
> .BI "             unsigned int " flags ", struct timespec *" timeout ");"
> .SH DESCRIPTION
> The
> .B recvmmsg
> system call receives multiple messages in a socket.
> It acts similar to
> .B recvmsg(2),
> but allows to batch multiple receive operations into a single syscall.
> In addition it support an explicit timeout.
>
> .B fd
> is the file descriptor of the socket to receive data from.
> .B mmsghdr
> is a pointer to an array with length
> .B vlen
> of
> .I mmsghdr
> structures.
> .I struct mmsg
> is defined in
> .I sys/socket.h
> as:
> .in +4n
> .nf
> struct mmsghdr {
>    struct msghdr msg_hdr;  /* Message header */
>    unsigned int  msg_len;  /* Number of received bytes for header */
> };
> .fi
> .in
> .PP
> .B msg_hdr
> is a struct
> .I msghdr
> as described in
> .I recvmsg(2).
> .B msg_len
> is the number of bytes returned for the message in the entry.
> This field has the same value as the return value of a single
> .I recvmsg(2)
> on the header.
>
> .B flags
> contains flags ored together. The flags are the same
> as documented for
> .I recvmsg(2).
> The additional
> .B MSG_WAITFORONE
> turns one
> .I MSG_DONTWAIT
> after the first message has been received.
>
> .B timeout
> points to a
> .I struct timespec
> (see
> .I clock_gettime(2)
> )
> defining a timeout for receiving, or
> .I NULL
> for no timeout. When the timeout expires
> .I recvmmsg
> returns.
> .SH RETURN VALUE
> .I recvmmsg
> returns the number of messages received in
> .I mmsghdr
> or
> -1
> when an error occurs. The
> .I msg_len
> members of
> .I mmsghdr
> are updated for each received message,
> in addition to other fields in the msg_hdr for each message,
> as described in
> .I recvmsg(2).
> .SH SEE ALSO
> .B recvmsg(2),
> .B sendmsg(2),
> .B socket(7),
> .B socket(2),
> .B clock_gettime(2)
> .SH VERSIONS
> The
> .I recvmmsg
> syscall was added with kernel 2.6.32.
> Support in glibc was added with 2.6.12.
> On earlier glibcs the function can be called
> manually using
> .I syscall(2).

I reworked a number of pieces of text, and added several other pieces.
Could you please take a look (for others interested: "man -l <file>")
at the version below and let me know of inaccuracies

Thanks,

Michael

.TH RECVMMSG 2 2011-09-09 "Linux" "Linux Programmer's Manual"
.SH NAME
recvmmsg \- receive multiple messages on a socket
.SH SYNOPSIS
.nf
.B "#define _GNU_SOURCE"
.BI "#include <sys/socket.h>"

.BI "int recvmmsg(int " sockfd ", struct mmsghdr *" msgvec \
", unsigned int " vlen ","
.br
.BI "             unsigned int " flags ", struct timespec *" timeout ");"
.fi
.SH DESCRIPTION
The
.BR recvmmsg ()
system call is an extension of
.BR recvmsg (2)
that allows the caller to receive multiple messages from a socket
using a single system call.
(This has performance benefits for some applications.)
A further extension over
.BR recvmsg (2)
is support for a timeout on the receive operation.

The
.I sockfd
argument is the file descriptor of the socket to receive data from.

The
.I msgvec
argument is a pointer to an array of
.I mmsghdr
structures.
The size of this array is specified in
.IR vlen .

The
.I mmsghdr
structure is defined in
.I <sys/socket.h>
as:

.in +4n
.nf
struct mmsghdr {
    struct msghdr msg_hdr;  /* Message header */
    unsigned int  msg_len;  /* Number of received bytes for header */
};
.fi
.in
.PP
The
.I msg_hdr
field is a
.I msghdr
structure, as described in
.BR recvmsg (2).
The
.I msg_len
field is the number of bytes returned for the message in the entry.
This field has the same value as the return value of a single
.BR recvmsg (2)
on the header.

The
.I flags
argument contains flags ORed together.
The flags are the same as documented for
.BR recvmsg (2),
with the following addition:
.TP
.B MSG_WAITFORONE
Turns on
.B MSG_DONTWAIT
after the first message has been received.
.PP
The
.I timeout
argument points to a
.I struct timespec
(see
.BR clock_gettime (2))
defining a timeout (seconds plus nanoseconds) for the receive operation.
If
.I timeout
is
.I NULL
then the operation blocks indefinitely.

A blocking
.BR recvmmsg ()
call blocks until
.I vlen
messages have been received
or until the timeout expires.
A nonblocking call reads as many messages as are available
(up to the limit specified by
.IR vlen )
and returns immediately.

On return from
.BR recvmmsg (),
successive elements of
.IR msgvec
are updated to contain information about each received message:
.I msg_len
contains the size of the received message;
the subfields of
.I msg_hdr
are updated as described in
.BR recvmsg (2).
The return value of the call indicates the number of elements of
.I msgvec
that have been updated.
.SH RETURN VALUE
On success,
.BR recvmmsg ()
returns the number of messages received in
.IR msgvec ;
on error, \-1 is returned, and
.I errno
is set to indicate the error.
.SH ERRORS
Errors are as for
.BR recvmsg (2).
In addition, the following error can occur:
.TP
.B EINVAL
.I timeout
is invalid.
.SH VERSIONS
The
.BR recvmmsg ()
system call was added in Linux 2.6.32.
Support in glibc was added in version 2.12.
.SH CONFORMING TO
.BR recvmmsg ()
is Linux-specific.
.SH SEE ALSO
.BR clock_gettime (2),
.BR recvmsg (2),
.BR sendmmsg (2),
.BR sendmsg (2),
.BR socket (2),
.BR socket (7)

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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