Date: Fri, 24 Jan 2003 17:53:36 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-questions <freebsd-questions@FreeBSD.ORG> Subject: Re: top -> what does sbwait mean ? Message-ID: <20030124175336.GB76154@happy-idiot-talk.infracaninophi> In-Reply-To: <018d01c2c3bb$a1f58cc0$fd01a8c0@motims> References: <018d01c2c3bb$a1f58cc0$fd01a8c0@motims>
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On Fri, Jan 24, 2003 at 10:16:53AM -0500, Moti Levy wrote:
> Hi to all ,
> I've written a small perl script ,
> when i run it it soemtimes shows in perl with sbwait state? where can i find
> out what sbwait ( or ither states for that matter ) mean ?
>
> ---------------
> PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND
> 9146 root 2 -20 303M 303M sbwait 1 46:34 0.00% 0.00% perl
> ----------------
sbwait is the name of a kernel function meaning 'socket buffer wait'
--- ie. the process is waiting on data to be delivered to or drain
from a socket. Or, at least that's what I gather from reading the
sources: there doesn't seem to be any documentation in the whole
RELENG_4 src tree mentioning that particular term:
% find /usr/src -type f -print | xargs grep -i sbwait
/usr/src/sys/kern/uipc_socket.c: error = sbwait(&so->so_snd);
/usr/src/sys/kern/uipc_socket.c: error = sbwait(&so->so_rcv);
/usr/src/sys/kern/uipc_socket.c: error = sbwait(&so->so_rcv);
/usr/src/sys/kern/uipc_socket2.c:sbwait(sb)
/usr/src/sys/kern/uipc_socket2.c: (sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH, "sbwait",
/usr/src/sys/kern/uipc_syscalls.c: * a race condition with sbwait().
/usr/src/sys/kern/uipc_syscalls.c: error = sbwait(&so->so_snd);
/usr/src/sys/kern/uipc_syscalls.c: * An error from sbwait usually indicates that we've
/usr/src/sys/kern/uipc_usrreq.c: * if sbwait returns an error due to receipt
/usr/src/sys/kern/uipc_usrreq.c: * of a signal. If sbwait does return
/usr/src/sys/kern/uipc_usrreq.c: (void) sbwait(&so->so_rcv);
/usr/src/sys/nfs/nfs_socket.c: * sbwait() after someone else has received my reply for me.
/usr/src/sys/sys/socketvar.h:int sbwait __P((struct sockbuf *sb));
The function definition is in /usr/src/sys/kern/uipc_socket2.c:
/*
* Wait for data to arrive at/drain from a socket buffer.
*/
int
sbwait(sb)
struct sockbuf *sb;
{
sb->sb_flags |= SB_WAIT;
return (tsleep((caddr_t)&sb->sb_cc,
(sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH, "sbwait",
sb->sb_timeo));
}
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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