Messages in this thread | | | Subject | Re: kernel error in system call accept() under kernel 2.6.8 | From | Bernd Petrovitsch <> | Date | Wed, 05 Oct 2005 19:53:48 +0200 |
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On Wed, 2005-10-05 at 17:41 +0200, Peter Duellings wrote: [....] > meanwhile we could generate a strace for the problem. > However, I guess that the strace does not give the desired > information (see parts below).
Yup. Where exactly does the kernel return -512 in the strace output? I can see only 40 and 43 which are valid file descriptors.
> Additionally we added in the program the output of the return > value of the accept() system call . The return value is -512 > and the errno value is 0! > > Usually the return value should be -1 and the errno should > contain the value without the sign of the error. > > > Any idea or comment on this ?
You are doing somewhere else something wrong so post a minimalistic piece of source code of how you get to it. Or show the *failing* case in the strace output.
> Thanks,
[...] > ---------<strace>------------ > 2682 09:25:29.238663 accept(21, <unfinished ...> > 2688 09:25:29.263486 accept(33, {sa_family=AF_INET, sin_port=htons(32811), > sin_addr=inet_addr("127.0.0.1")}, [16]) = 40 <27.171270> > 2688 09:25:56.589969 accept(33, 0x82fa7e0, [16]) = ? ERESTARTSYS (To be > restarted) <0.385453> > 2688 09:25:56.975563 --- SIGCHLD (Child exited) @ 0 (0) --- > 2688 09:25:56.975676 accept(33, 0x82fa7e0, [16]) = ? ERESTARTSYS (To be > restarted) <0.205963> > 2688 09:25:57.181770 --- SIGCHLD (Child exited) @ 0 (0) --- > 2688 09:25:57.181842 accept(33, <unfinished ...> > 2682 09:25:57.231961 <... accept resumed> {sa_family=AF_INET, > sin_port=htons > (32882), sin_addr=inet_addr("127.0.0.1")}, [16]) = 43 <27.993066> > 2682 09:25:57.234320 accept(21, <unfinished ...> > 2688 09:25:57.538314 <... accept resumed> 0x82fa7e0, [16]) = ? ERESTARTSYS > (To be restarted) <0.356435> > 2688 09:25:57.538429 --- SIGCHLD (Child exited) @ 0 (0) --- > 2688 09:25:57.538488 accept(33, 0x82fa7e0, [16]) = ? ERESTARTSYS (To be > restarted) <0.015688> > 2688 09:25:57.554315 --- SIGCHLD (Child exited) @ 0 (0) --- > 2688 09:25:57.554370 accept(33, 0x82fa7e0, [16]) = ? ERESTARTSYS (To be > restarted) <0.192660> > 2688 09:25:57.747151 --- SIGCHLD (Child exited) @ 0 (0) --- > 2688 09:25:57.747236 accept(33, 0x82fa7e0, [16]) = ? ERESTARTSYS (To be > restarted) <0.097813> > .... > . > ---------</strace>------------ [...]
Bernd -- Firmix Software GmbH http://www.firmix.at/ mobil: +43 664 4416156 fax: +43 1 7890849-55 Embedded Linux Development and Services
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