John Polstra 719077d1be Fix a bug in lseek which caused the loader to fail on some gzipped ... kernels. The error message was "elf_loadexec: cannot seek". Libstand maintains a read-ahead buffer for each open file, so that it can read in chunks of 512 bytes for greater efficiency. When the loader tries to lseek forward in a file by a small amount, it sometimes happens that the target file offset is already in the read-ahead buffer. But the lseek code simply discarded the contents of that buffer and performed a seek directly on the underlying file. This resulted in an attempt to seek backwards in the file, since some of the data has already been read into the read-ahead buffer. Gzipped data streams cannot seek backwards, so an error was returned. This commit adds code which checks to see if the desired file offset is already in the read-ahead buffer. If it is, the code simply adjusts the buffer pointer and length, thereby avoiding a reverse seek on the gzipped data stream. I incorporated a suggestion from Matt Dillon which saved a little bit of code in this fix. Reviewed by: dillon, gallatin, jhb		2001-08-29 23:33:22 +00:00
..
alpha	We compile expressly on the alpha with -mno-fp-regs - so do not use them	2000-05-12 21:48:54 +00:00
i386	Removed duplicate VCS ID tags, as per style(9).	2001-08-13 14:06:34 +00:00
ia64	Removed duplicate VCS ID tags, as per style(9).	2001-08-13 14:06:34 +00:00
powerpc	Make setjmp work our way, as opposed to NetBSD's.	2000-11-10 06:10:28 +00:00
__main.c
arp.c
assert.c	Make include file consistent with the rest of libstand.	2001-07-31 15:49:50 +00:00
bcd.c	Make libstand compile	2000-09-03 11:29:18 +00:00
bootp.c	IN_CLASS*() macros assume host order and s_addr is network byte	2000-09-20 18:16:20 +00:00
bootp.h	Add support to send the string 'PXEClient' as the Vendor class	2000-08-11 08:36:17 +00:00
bootparam.c
bootparam.h
bswap.c
cd9660.c	Bail if we go beyond the directory size, not just if we hit it.	2001-08-23 17:08:26 +00:00
close.c	Implement readahead buffering for non-raw files. This drastically improves	2000-09-05 09:52:50 +00:00
closeall.c
dev.c
dev_net.c	Add a new field to the devsw structure; dv_print, to print all valid units	1998-10-31 02:48:29 +00:00
dev_net.h
dosfs.c	Add a readdir function to the loader fsops vector, and implement the	2000-04-29 20:47:10 +00:00
dosfs.h
environment.c	Cleanup warnings by adding missint prototypes, removing unneeded duplicate	2000-08-03 09:08:29 +00:00
ether.c	More egcs warning fixes:	1999-04-25 22:29:30 +00:00
ext2fs.c	Fix typo: compatability -> compatibility.	2001-02-06 12:05:58 +00:00
fstat.c
getopt.c
gets.c	Add a new field to the devsw structure; dv_print, to print all valid units	1998-10-31 02:48:29 +00:00
globals.c
gzipfs.c	Add a readdir function to the loader fsops vector, and implement the	2000-04-29 20:47:10 +00:00
if_ether.h	Back out the previous change to the queue(3) interface.	2000-05-26 02:09:24 +00:00
in_cksum.c
inet_ntoa.c	Use unsigned chars instead of signed chars when extracting bits of the	1998-09-23 21:35:40 +00:00
ioctl.c
iodesc.h
libstand.3	mdoc(7) police: s/BSD/.Bx/ where appropriate.	2001-08-14 10:01:54 +00:00
lseek.c	Fix a bug in lseek which caused the loader to fail on some gzipped	2001-08-29 23:33:22 +00:00
Makefile	MAN[1-9] -> MAN.	2001-03-27 17:27:19 +00:00
net.c	Break out sendudp and readudp from net.c. This is for PXE, so it	2000-04-08 01:18:04 +00:00
net.h	Don't always enable debugging for the network device code.	2000-11-10 06:06:55 +00:00
netif.c	Compensate for header dethreading.	2001-05-01 09:37:01 +00:00
netif.h	Cleanup warnings by adding missint prototypes, removing unneeded duplicate	2000-08-03 09:08:29 +00:00
nfs.c	Expose the NFS root node, so that an evil consumer can use it to get the	2000-09-05 22:11:41 +00:00
nfsv2.h	Fix comment.	2000-05-06 04:50:09 +00:00
nullfs.c	Add a readdir function to the loader fsops vector, and implement the	2000-04-29 20:47:10 +00:00
open.c	Backout last commit. It was wrong.. *sigh*	2000-09-10 01:17:47 +00:00
pager.c	Silence -Wnon-const-format	2001-02-18 04:51:47 +00:00
printf.c	Tidy up some loose ends. nullfs_read/write were returning the wrong value.	1999-12-27 08:45:14 +00:00
qdivrem.c	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
quad.h	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
random.c	Make libstand compile	2000-09-03 11:29:18 +00:00
rarp.c
read.c	Implement readahead buffering for non-raw files. This drastically improves	2000-09-05 09:52:50 +00:00
readdir.c	Add a readdir function to the loader fsops vector, and implement the	2000-04-29 20:47:10 +00:00
rpc.c
rpc.h
rpcv2.h
saioctl.h
sbrk.c	Fix the real problem that broke the Alpha loader this last week. It	2000-05-12 22:43:20 +00:00
stand.h	Replace functional bugs of ctypish functions in libstand with style	2001-05-14 16:49:20 +00:00
stat.c
strcasecmp.c	Add strcasecmp source file required for dosfs operation.	1998-10-07 13:50:17 +00:00
strdup.c
strerror.c
strtol.c
tftp.c	Reset errno so that subsequent TFTP requests don't fail after the	2001-06-30 21:39:09 +00:00
tftp.h
twiddle.c	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
udp.c	Correct the returned UDP datagram length. See the PR for a more comprehensive	2001-05-28 22:27:06 +00:00
ufs.c	Add a readdir function to the loader fsops vector, and implement the	2000-04-29 20:47:10 +00:00
write.c
zalloc.c	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
zalloc_defs.h	A quick and dirty port of libstand to ia64.	2001-03-06 16:11:36 +00:00
zalloc_malloc.c	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
zalloc_mem.h	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
zalloc_protos.h	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
zipfs.c	Add a readdir function to the loader fsops vector, and implement the	2000-04-29 20:47:10 +00:00