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$ sudo dtrace -lP fbt
   ID   PROVIDER            MODULE                          FUNCTION NAME
181138        fbt com.apple.iokit.IOSCSIBlockCommandsDevice _ZN22IOBlockStorageServices9MetaClassC1Ev [IOBlockStorageServices::MetaClass::MetaClass()] entry
181139        fbt com.apple.iokit.IOSCSIBlockCommandsDevice _ZN22IOBlockStorageServices9MetaClassC1Ev [IOBlockStorageServices::MetaClass::MetaClass()] return
181140        fbt com.apple.iokit.IOSCSIBlockCommandsDevice _ZN22IOBlockStorageServicesC2EPK11OSMetaClass [IOBlockStorageServices::IOBlockStorageServices(OSMetaClass const*)] entry
181141        fbt com.apple.iokit.IOSCSIBlockCommandsDevice _ZN22IOBlockStorageServicesC2EPK11OSMetaClass [IOBlockStorageServices::IOBlockStorageServices(OSMetaClass const*)] return
181142        fbt com.apple.iokit.IOSCSIBlockCommandsDevice _ZN22IOBlockStorageServicesC1EPK11OSMetaClass [IOBlockStorageServices::IOBlockStorageServices(OSMetaClass const*)] entry
181143        fbt com.apple.iokit.IOSCSIBlockCommandsDevice _ZN22IOBl

pnasrat

Bhyve-HandleProtocol: Copying DevPath: PciRoot(0x0)/Pci(0x4,0x0)/HD(1,MBR,0x00000000,0x40,0x3C0) [64]
probing: pc0 mem[640K 999M 16M 6M 64K]
disk:Bhyve-HandleProtocol: Copying DevPath: PciRoot(0x0)/Pci(0x4,0x0) [22]
 hd0
>> OpenBSD/amd64 BOOTX64 3.30
boot>
cannot open hd0a:/etc/random.seed: No such file or directory
booting hd0a:/bsd: 3343316+1410944+2413568+0+598016=0x76a238
entry point at 0xf001000 [7205c766, 34000004, 24448b12, 94b0a304]

pnasrat

XNU build blog

• Build dtrace
  • mkdir -p obj sym dst
  • $ xcodebuild install -target ctfconvert -target ctfdump -target ctfmerge ARCHS="x86_64" SRCROOT=$PWD OBJROOT=$PWD/obj SYMROOT=$PWD/sym DSTROOT=$PWD/dst
• sudo xcodebuild -license

7.3.1

• hfs:

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• ls
• ps
• pgrep
• strace - used to trace system (kernel) calls
• ltrace - used to trace library (C)
• /proc filesystem - lots of information
• /proc/
• /proc//fd
• lsof - list of open files including network
• gdb - briefly

pnasrat

(gdb) bt
#0  0x00000001002400ab in hv_vcpu_run () from /System/Library/Frameworks/Hypervisor.framework/Versions/A/Hypervisor
#1  0x00000001000054d9 in vmx_run ()
#2  0x0000000100023b78 in vcpu_thread ()
#3  0x00007fff954ed99d in _pthread_body () from /usr/lib/system/libsystem_pthread.dylib
#4  0x00007fff954ed91a in _pthread_start () from /usr/lib/system/libsystem_pthread.dylib
#5  0x00007fff954eb351 in thread_start () from /usr/lib/system/libsystem_pthread.dylib
#6  0x0000000000000000 in ?? ()

pnasrat

Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect

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#!/usr/bin/env expect

spawn "./hyperkitrun.sh"
set pid [exp_pid]
expect "tc@box:~$"
send "sudo halt\r\n";
expect {
  timeout {exec kill -9 $pid; exit 1}
  "reboot: System halted"
}

pnasrat

-Usage: xhyve [-behuwxMACHPWY] [-c vcpus] [-g <gdb port>] [-l <lpc>]
-             [-m mem] [-p vcpu:hostcpu] [-s <pci>] [-U uuid] -f <fw>
+Usage: com.docker.hyperkit [-behuwxMACHPWY] [-c vcpus] [-F <pidfile>] [-g <gdb port>] [-l <lpc>]
+                           [-m mem] [-p vcpu:hostcpu] [-s <pci>] [-U uuid] -f <fw>
        -A: create ACPI tables
        -c: # cpus (default 1)
        -C: include guest memory in core file
        -e: exit on unhandled I/O access
        -f: firmware
+       -F: pidfile

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Availability	Uptime
90.0%	36 day 12 hours
95.0%	18 days, 6 hours
99.0%	87 hours, 36 minutes
99.50%	43 hours, 48 minutes
99.90%	8 hours, 48 minutes
99.99%	52 minutes, 33 seconds
99.999%	5 minutes, 15 seconds
99.9999%	32 seconds

pnasrat

what is a shell?

Shell is a programming environment that terminal runs. it's a text based GUI for interacting with your system.

what is shell good for?

shell can give you information about your system, allows you to modify and run programs. let's try something

say "hello pris"