Robert Morris 4de161f973 don't panic if a program frees all its memory with sbrk(). ...

if a program sbrk()'s to a non-page-boundary, don't free that page.
corresponding usertests.

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..

alarmtest.c

user printf(1 -> printf(

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cat.c

error exit status is 1

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echo.c

Support exit status for exit/wait

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forktest.c

error exit status is 1

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grep.c

error exit status is 1

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init.c

error exit status is 1

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initcode.S

separate source into kernel/ user/ mkfs/

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kill.c

error exit status is 1

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ln.c

error exit status is 1

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ls.c

Support exit status for exit/wait

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mkdir.c

error exit status is 1

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printf.c

user printf(1 -> printf(

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rm.c

error exit status is 1

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sh.c

error exit status is 1

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stressfs.c

Support exit status for exit/wait

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ulib.c

separate source into kernel/ user/ mkfs/

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umalloc.c

separate source into kernel/ user/ mkfs/

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user.h

Support exit status for exit/wait

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usertests.c

don't panic if a program frees all its memory with sbrk().

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usys.pl

separate source into kernel/ user/ mkfs/

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wc.c

error exit status is 1

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zombie.c

Support exit status for exit/wait

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