Scripts

Both scripts are to be placed in the parent directory, where asst2-src and root are subdirectories

Build Script

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#!/bin/bash

cd "$(dirname "$0")/asst2-src"

echo "Building User Files..."
bmake > /dev/null && bmake install > /dev/null

cd kern/compile/ASST2
echo "Building Kernel..."
bmake > /dev/null && bmake install > /dev/null

Run Script

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#!/bin/bash

cd "$(dirname "$0")/root"

sys161 kernel $@

Syscall Table

Warning: There's alot.

Function	ID
`fork`	0
`vfork`	1
`execv`	2
`_exit`	3
`waitpid`	4
`getpid`	5
`getppid`	6
`sbrk`	7
`mmap`	8
`munmap`	9
`mprotect`	10
`umask`	17
`issetugid`	18
`getresuid`	19
`setresuid`	20
`getresgid`	21
`setresgid`	22
`getgroups`	23
`setgroups`	24
`__getlogin`	25
`__setlogin`	26
`kill`	27
`sigaction`	28
`sigpending`	29
`sigprocmask`	30
`sigsuspend`	31
`sigreturn`	32
`open`	45
`pipe`	46
`dup`	47
`dup2`	48
`close`	49
`read`	50
`pread`	51
`getdirentry`	54
`write`	55
`pwrite`	56
`lseek`	59
`flock`	60
`ftruncate`	61
`fsync`	62
`fcntl`	63
`ioctl`	64
`select`	65
`poll`	66
`link`	67
`remove`	68
`mkdir`	69
`rmdir`	70
`mkfifo`	71
`rename`	72
`access`	73
`chdir`	74
`fchdir`	75
`__getcwd`	76
`symlink`	77
`readlink`	78
`mount`	79
`unmount`	80
`stat`	81
`fstat`	82
`lstat`	83
`utimes`	84
`futimes`	85
`lutimes`	86
`chmod`	87
`chown`	88
`fchmod`	89
`fchown`	90
`lchmod`	91
`lchown`	92
`socket`	98
`bind`	99
`connect`	100
`listen`	101
`accept`	102
`shutdown`	104
`getsockname`	105
`getpeername`	106
`getsockopt`	107
`setsockopt`	108
`__time`	113
`__settime`	114
`nanosleep`	115
`sync`	118
`reboot`	119

Found in asst2-src/kern/include/kern/syscall.h

Error Numbers

Click to open

Name	ID	Description
`ENOSYS`	1	Function not implemented
`-`	2	unused
`ENOMEM`	3	Out of memory
`EAGAIN`	4	Operation would block
`EINTR`	5	Interrupted system call
`EFAULT`	6	Bad memory reference
`ENAMETOOLONG`	7	String too long
`EINVAL`	8	Invalid argument
`EPERM`	9	Operation not permitted
`EACCES`	10	Permission denied
`EMPROC`	11	Too many processes
`ENPROC`	12	Too many processes in system
`ENOEXEC`	13	File is not executable
`E2BIG`	14	Argument list too long
`ESRCH`	15	No such process
`ECHILD`	16	No child processes
`ENOTDIR`	17	Not a directory
`EISDIR`	18	Is a directory
`ENOENT`	19	No such file or directory
`ELOOP`	20	Too many levels of symbolic links
`ENOTEMPTY`	21	Directory not empty
`EEXIST`	22	File or object exists
`EMLINK`	23	Too many hard links
`EXDEV`	24	Cross-device link
`ENODEV`	25	No such device
`ENXIO`	26	Device not available
`EBUSY`	27	Device or resource busy
`EMFILE`	28	Too many open files
`ENFILE`	29	Too many open files in system
`EBADF`	30	Bad file number
`EIOCTL`	31	Invalid or inappropriate ioctl
`EIO`	32	Input/output error
`ESPIPE`	33	Illegal seek
`EPIPE`	34	Broken pipe
`EROFS`	35	Read-only file system
`ENOSPC`	36	No space left on device
`EDQUOT`	37	Disc quota exceeded
`EFBIG`	38	File too large
`EFTYPE`	39	Invalid file type or format
`EDOM`	40	Argument out of range
`ERANGE`	41	Result out of range
`EILSEQ`	42	Invalid multibyte character sequence
`ENOTSOCK`	43	Not a socket
`EISSOCK`	44	Is a socket
`EISCONN`	45	Socket is already connected
`ENOTCONN`	46	Socket is not connected
`ESHUTDOWN`	47	Socket has been shut down
`EPFNOSUPPORT`	48	Protocol family not supported
`ESOCKTNOSUPPORT`	49	Socket type not supported
`EPROTONOSUPPORT`	50	Protocol not supported
`EPROTOTYPE`	51	Protocol wrong type for socket
`EAFNOSUPPORT`	52	Address family not supported by protocol family
`ENOPROTOOPT`	53	Protocol option not available
`EADDRINUSE`	54	Address already in use
`EADDRNOTAVAIL`	55	Cannot assign requested address
`ENETDOWN`	56	Network is down
`ENETUNREACH`	57	Network is unreachable
`EHOSTDOWN`	58	Host is down
`EHOSTUNREACH`	59	Host is unreachable
`ECONNREFUSED`	60	Connection refused
`ETIMEDOUT`	61	Connection timed out
`ECONNRESET`	62	Connection reset by peer
`EMSGSIZE`	63	Message too large
`ENOTSUP`	64	Threads operation not supported

Found in asst2-src/kern/include/kern/errno.h

MIPS Exception Codes

Click to open

Name	ID	Description
`EX_IRQ`	0	Interrupt
`EX_MOD`	1	TLB Modify (write to read-only page)
`EX_TLBL`	2	TLB miss on load
`EX_TLBS`	3	TLB miss on store
`EX_ADEL`	4	Address error on load
`EX_ADES`	5	Address error on store
`EX_IBE`	6	Bus error on instruction fetch
`EX_DBE`	7	Bus error on data load or store
`EX_SYS`	8	Syscall
`EX_BP`	9	Breakpoint
`EX_RI`	10	Reserved (illegal) instruction
`EX_CPU`	11	Coprocessor unusable
`EX_OVF`	12	Arithmetic overflow

Found in asst2-src/kern/arch/mips/include/trapframe.h

Design Questions / Considerations

What is the difference between UIO_USERISPACE and UIO_USERSPACE?

UIO_USERISPACE - User Code
UIO_USERSPACE - User Data

When should one use UIO_SYSSPACE instead?

Kernel related stuff. Doesn't require validity checks - as the kernel is trusted to be safe.

Assignment 2 - Useful Things To Know

Contents