Date: Fri, 25 Nov 2005 21:09:11 -0600 From: David Kelly <dkelly@HiWAAY.net> To: FreeBSD Questions <questions@freebsd.org> Subject: How to find system call in kernel source code? Message-ID: <280A8F3A-C519-425A-8A70-AD9266B8D584@HiWAAY.net>
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The sendfile(2) function is apparently a kernel system call. I've
"find /usr/src -type f -exec grep -il sendfile "{}" \;" and several
variations yet not found where the code which performs sendfile() is
located. Is system call 393. Guessing I'm just missing the dispatch
table.
This is also related to P/R bin/89100. At least for me, RELENG_6
fails to send files greater than 4 GB after a few hours or days on
the disk. Freshly copied files work fine. No problem copying the file
with cp. And md5 confirms the contents have not changed.
Built a special ftpd with -g compiler flag. Am not good enough with
gdb to breakpoint a forked child, which apparently "ftpd -D" does
immediately. So sprinkled enough printf's to confirm sendfile() is
coming up short, is restarted, and errs finally producing the
"premature EOF" error message. Yet I've done enough that I'm
confident the arguments are being passed properly and of sufficient
size.
The files are between 4G and 8G and when the failure occurs the
transfer is always filesize modulo 4G. Exactly as if a 4 byte length
truncated. But strange in that it works on a new file today but
doesn't after the file is a few hours or days old. Once a file is old
enough to fail all files on that filesystem written before it also
fail. Not related to timestamp as "cp -p" will "repair" the file
temporarily.
No errors in /var/log/messages or dmesg. No errors manually launching
fsck to check the filesystems. And everything but the sendfile()
system call seems to work.
--
David Kelly N4HHE, dkelly@HiWAAY.net
========================================================================
Whom computers would destroy, they must first drive mad.
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