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.cvsignore
.cvsignore
 
 
.dir-locals.el
.dir-locals.el
 
 
.gdbinit.tmpl
.gdbinit.tmpl
 
 
.gitignore
.gitignore
 
 
BUGS
BUGS
 
 
LICENSE
LICENSE
 
 
Makefile
Makefile
 
 
Notes
Notes
 
 
README
README
 
 
README.md
README.md
 
 
TRICKS
TRICKS
 
 
asm.h
asm.h
 
 
bio.c
bio.c
 
 
bootasm.S
bootasm.S
 
 
bootmain.c
bootmain.c
 
 
buf.h
buf.h
 
 
cat.c
cat.c
 
 
console.c
console.c
 
 
cuth
cuth
 
 
date.h
date.h
 
 
defs.h
defs.h
 
 
dot-bochsrc
dot-bochsrc
 
 
echo.c
echo.c
 
 
elf.h
elf.h
 
 
entry.S
entry.S
 
 
entryother.S
entryother.S
 
 
exec.c
exec.c
 
 
fcntl.h
fcntl.h
 
 
file.c
file.c
 
 
file.h
file.h
 
 
forktest.c
forktest.c
 
 
fs.c
fs.c
 
 
fs.h
fs.h
 
 
gdbutil
gdbutil
 
 
grep.c
grep.c
 
 
ide.c
ide.c
 
 
init.c
init.c
 
 
initcode.S
initcode.S
 
 
ioapic.c
ioapic.c
 
 
kalloc.c
kalloc.c
 
 
kbd.c
kbd.c
 
 
kbd.h
kbd.h
 
 
kernel.ld
kernel.ld
 
 
kill.c
kill.c
 
 
lapic.c
lapic.c
 
 
ln.c
ln.c
 
 
log.c
log.c
 
 
ls.c
ls.c
 
 
lseek1.c
lseek1.c
 
 
lseek2.c
lseek2.c
 
 
main.c
main.c
 
 
memide.c
memide.c
 
 
memlayout.h
memlayout.h
 
 
mkdir.c
mkdir.c
 
 
mkfs.c
mkfs.c
 
 
mmu.h
mmu.h
 
 
mp.c
mp.c
 
 
mp.h
mp.h
 
 
param.h
param.h
 
 
picirq.c
picirq.c
 
 
pipe.c
pipe.c
 
 
pr.pl
pr.pl
 
 
printf.c
printf.c
 
 
printpcs
printpcs
 
 
proc.c
proc.c
 
 
proc.h
proc.h
 
 
rm.c
rm.c
 
 
runoff
runoff
 
 
runoff.list
runoff.list
 
 
runoff.spec
runoff.spec
 
 
runoff1
runoff1
 
 
sh.c
sh.c
 
 
show1
show1
 
 
sign.pl
sign.pl
 
 
sleep1.p
sleep1.p
 
 
sleeplock.c
sleeplock.c
 
 
sleeplock.h
sleeplock.h
 
 
spinlock.c
spinlock.c
 
 
spinlock.h
spinlock.h
 
 
spinp
spinp
 
 
stat.h
stat.h
 
 
stressfs.c
stressfs.c
 
 
string.c
string.c
 
 
swtch.S
swtch.S
 
 
syscall.c
syscall.c
 
 
syscall.h
syscall.h
 
 
sysfile.c
sysfile.c
 
 
sysproc.c
sysproc.c
 
 
test.txt
test.txt
 
 
toc.ftr
toc.ftr
 
 
toc.hdr
toc.hdr
 
 
trap.c
trap.c
 
 
trapasm.S
trapasm.S
 
 
traps.h
traps.h
 
 
types.h
types.h
 
 
uart.c
uart.c
 
 
ulib.c
ulib.c
 
 
umalloc.c
umalloc.c
 
 
user.h
user.h
 
 
usertests.c
usertests.c
 
 

Repository files navigation

os-xv6-lseek

  • lseek system call in xv6. Does not handle "holes" which create sparse files (because that would required modifying \read to supply 0x00 when someone reads from a hole.

  • lseek1.c, and corresponding executable

  • lseek2.c, when filesize is not a multiple of 10, then it arbitrarily decides that the first size % 10 chunks will be 1 byte larger than the other chunks, and the chunks get copied accordingly. (Nice application of prefix sum!)

  • test.txt contains data with which checks can be done easily.

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lseek system call in xv6

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xv6-system-call

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