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<font style='font-size:12px'>Dear all<br> I am now using ELDK-2005-1 from denx, the powerpc cpu is MPC8270 (TQM8260 in platform selection), the libc is libc-2.3.1.so, the kernel from ELDK is 2.4.25.<br> I also use syslogd from our previous product.<br> Now I met a problem when start syslogd from bash, on other platforms, such as ARM/X86/Mips, the syslogd can fork a child process, and then the parent syslogd will be killed by child syslogd quickly, so leaving the child syslogd running in background.<br> But, on my PowerPC target, the parent syslogd will hang for 30Sec, and then exit with alarm clock timeout(30Sec). I used strace to check what happened in syslogd, and I found that it will use select sytem call and read /proc/kmsg.<br> To compare, on other targets, there is read(6,.....,nnnn)=-1 [EAGAIN](6 is the file id of /proc/kmsg), then child syslogd will kill parent syslogd. But on PowerPC target, it is read(6,......,nnnn)=?[ERESTARTSYS], so I think the libc will call system call read many many times.<br> Then, I check the child syslogd with /proc/thepid/status, I found the sigpnd is 000000000, that is there is no signal pending on child syslogd.<br> But, in /kernel/prink.c, I added prink("aaaaaaaaaa\n") after wait_event_interruptible() when it returns error, and with dmesg, I did get aaaaaaaaaa output.<br> So, to summarize, on other hardware platforms, why there is EAGAIN, while on PPC target, it is ERESTARTSYS instead.<br> I hope I have described my question clearly. Thank you for your help and best regards,<br><br> W.target<br> 1-Jan-2007<br><style>p{margin:0}img{border:0}</style></font><br />
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