Note: Options that are not defined by device definition files are passed to the compile process as -D flags to the C compiler.

For example, a local configuration file that wanted the kitchen sink, but not COMPAT_09 or bridging, might be:

include "arch/i386/conf/GENERIC" 
no options COMPAT_09 
no pseudo-device bridge

The interface to the kernel NTP support is provided by the ntp_adjtime(2) and ntp_gettime(2) system calls, which are intended for use by ntpd(8) and are enabled by the option. On systems with sub-microsecond resolution timers, or where (HZ / 100000) is not an integer, the NTP option also enables extended-precision arithmetic to keep track of fractional clock ticks at NTP time-format precision.

NTP uses the PPS signal to discipline the local clock oscillator to a high degree of precision (typically less than 50 microseconds in time and 0.1 ppm in accuracy). PPS can also generate a serial output pulse when the system receives a PPS interrupt. This can be used to measure the system interrupt latency and thus calibrate NTP to account for it. Using PPS usually requires a gadget box to convert from TTL to RS-232 signal levels. The gadget box and PPS are described in more detail in the HTML documentation for ntpd(8) in /usr/share/doc/html/ntp.

NetBSD currently supports this option in com(4) and zsc(4).

NOTE: Using this option will also enable options FDSCRIPTS

NOTE: Execute only (non-readable) scripts will have argv[0] set to /dev/fd/*. What this option allows as far as security is concerned, is the ability to safely ensure that the correct script is run by the interpreter, as it is passed as an already open file.

NOTE: Unfortunately, in many cases where the hardware clock is kept in local time, it is adjusted for Daylight Savings Time; this means that attempting to use RTC_OFFSET to let NetBSD coexist with such an operating system, like Windows, would necessitate changing RTC_OFFSET twice a year. As such, this solution is imperfect.

strings netbsd | sed -n 's/^_CFG_//p' | unvis

netstat -mssv

The value is the default value for the global knob, see sysctl(3). If 0, PaX MPROTECT will be enabled only if explicitly set on programs using paxctl(8). If 1, PaX MPROTECT will be enabled for all programs. Programs can be exempted using paxctl(8).

See security(7) for more details.

The value is the default value for the global knob, see sysctl(3). If 0, PaX Segvguard will be enabled only if explicitly set on programs using paxctl(8). If 1, PaX Segvguard will be enabled to all programs, and exemption can be done using paxctl(8).

See security(7) for more details.

The value is the default value for the global knob, see sysctl(3). If 0, PaX ASLR will be enabled only if explicitly set on programs using paxctl(8). If 1, PaX ASLR will be enabled to all programs, and exemption can be done using paxctl(8).

See security(7) for more details.

The third part accounts for the size of the file buffer cache. Its size is either NKPTADD pages (if defined) or memory size in bytes divided by two to the power of NKPTADDSHIFT. The default is undefined NKPTADD and NKPTADDSHIFT=24, allowing for 16 buffers per megabyte of main memory (while a GENERIC kernel allocates about half of that). When you get "can't get KPT page" panics, you should increase NKPTADD (if defined), or decrease NKPTADDSHIFT by one.

IRQ Val      IRQ Val      IRQ Val       IRQ Val 
 0  0x0001    4  0x0010    8  0x0100    12  0x1000 
 1  0x0002    5  0x0020    9  0x0200    13  0x2000 
 2  0x0004    6  0x0040   10  0x0400    14  0x4000 
 3  0x0008    7  0x0080   11  0x0800    15  0x8000

1

color inversed

2

underlined

4

bolded