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2011-01-11make new code like old codeRuss Cox1-1/+1
Variable declarations at top of function, separate from initialization. Use == 0 instead of ! for checking pointers. Consistent spacing around {, *, casts. Declare 0-parameter functions as (void) not (). Integer valued functions return -1 on failure, 0 on success.
2009-03-08xv6: use stosb for memsetrsc1-5/+2
2007-08-24Remove puts in favor of printf.rsc1-6/+0
Allow multiple arguments to ls.
2007-08-22PDF at http://am.lcs.mit.edu/~rsc/xv6.pdfrsc1-0/+12
Various changes made while offline. + bwrite sector argument is redundant; use b->sector. + reformatting of files for nicer PDF page breaks + distinguish between locked, unlocked inodes in type signatures + change FD_FILE to FD_INODE + move userinit (nee proc0init) to proc.c + move ROOTDEV to param.h + always parenthesize sizeof argument
2007-08-10avoid assignments in declarationsrsc1-6/+7
2007-08-08standardize on not using unsigned keywordrsc1-3/+3
2007-08-08atoi, for killrsc1-0/+11
2007-08-08change gets to return \n, to distinguish 0-byte read from empty linersc1-1/+1
2006-09-06break single-line if statementsrsc1-1/+2
2006-09-06standardize various * conventionsrsc1-8/+8
2006-09-06spacing fixes: no tabs, 2-space indents (for rtm)rsc1-16/+16
2006-08-23i/o redirection in shkaashoek1-0/+17
better parsing of sh commands (copied from jos sh) cat: read from 1 if no args sbrk system call, but untested getpid system call moved locks in keyboard intr, but why do we get intr w. null characters from keyboard?
2006-08-14set size for directories correctly in wdir and mkfskaashoek1-2/+2
mkdir ls shows stat info for each dir entry
2006-08-14start on mkdirkaashoek1-0/+16
stat
2006-08-12fix getblk to actually lock the blockrtm1-0/+11
no more cons_put system calls usertests tests two processes writing files
2006-08-11init creates console, opens 0/1/2, runs shrtm1-11/+28
sh accepts 0-argument commands (like userfs) reads from console
2006-07-16add %s to cprintf for cons_putsrsc1-0/+10
2006-07-16Add user.h for prototypes.rsc1-0/+8
Add cons_puts for cleaner output.
2006-07-11Changes to allow use of native x86 ELF compilers, which on myrsc1-56/+0
Linux 2.4 box using gcc 3.4.6 don't seem to follow the same conventions as the i386-jos-elf-gcc compilers. Can run make 'TOOLPREFIX=' or edit the Makefile. curproc[cpu()] can now be NULL, indicating that no proc is running. This seemed safer to me than having curproc[0] and curproc[1] both pointing at proc[0] potentially. The old implementation of swtch depended on the stack frame layout used inside swtch being okay to return from on the other stack (exactly the V6 you are not expected to understand this). It also could be called in two contexts: at boot time, to schedule the very first process, and later, on behalf of a process, to sleep or schedule some other process. I split this into two functions: scheduler and swtch. The scheduler is now a separate never-returning function, invoked by each cpu once set up. The scheduler looks like: scheduler() { setjmp(cpu.context); pick proc to schedule blah blah blah longjmp(proc.context) } The new swtch is intended to be called only when curproc[cpu()] is not NULL, that is, only on behalf of a user proc. It does: swtch() { if(setjmp(proc.context) == 0) longjmp(cpu.context) } to save the current proc context and then jump over to the scheduler, running on the cpu stack. Similarly the system call stubs are now in assembly in usys.S to avoid needing to know the details of stack frame layout used by the compiler. Also various changes in the debugging prints.
2006-07-06disable all interrupts when acquiring lockkaashoek1-0/+8
user program that makes a blocking system call
2006-07-01swtch saves callee-saved registersrtm1-0/+14
swtch idles on per-CPU stack, not on calling process's stack fix pipe bugs usertest.c tests pipes, fork, exit, close
2006-06-27file descriptorsrtm1-0/+44
pipes