Date: Sun, 8 May 2005 14:18:47 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: ChenMing <chenm@huawei.com> Cc: freebsd-hackers@freebsd.org Subject: Re: doubt: msgrcv not return EAGAIN? Message-ID: <20050508191846.GA38839@dan.emsphone.com> In-Reply-To: <0IG400A5VLW94V@szxml01-in.huawei.com> References: <0IG400A5VLW94V@szxml01-in.huawei.com>
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In the last episode (May 07), ChenMing said:
> I use following line to recive message from message queue:
>
> int ret;
> ret = msgrcv(msgid, &msg, sizeof(msg), 0, IPC_NOWAIT) if (ret == -1) {
> if (errno == EAGAIN){
> // no message in queue
> }
> else{
> // here is an error occur
> }
> }
>
> but it sounds not works as my expected. It never return errno=EAGAIN,
> however it return errno=ENOMSG instead, but msgrcv manual say its
> should return EAGAIN. what's wrong?
I think the manpage is incorrect.
--
Dan Nelson
dnelson@allantgroup.com
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