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bsp;to execute code on the stack will kill the
process with a SIGSEGV signal and log a message in kern:notice. Program
which rely on an executable stack must use the mprotect(2) function to
explicitly mark executable memory areas.
Refer to the System Administration Guide for more information on this
topic. Admins which don't want the report about executable stack can set
the noexec_user_stack_log variable explicitly to 0.
Also note that the 64 bit V9 ABI defaults to stacks without execute
permissions.
TCP/IP参数设置
TCP/IP参数可以由ndd工具来设置，
Ndd命令能容易的在不重新配置系统内核和重起系统的情况下，修改核心和TCP/IP的设备
的一些参数。使用如下命令可看到相应的帮助。
#ndd /dev/arp \?
? (read only)
arp_cache_report (read only)
arp_debug (read and write)
arp_cleanup_interval (read and write)
# ndd /dev/icmp \?
? (read only)
icmp_wroff_extra (read and write)
icmp_def_ttl (read and write)
icmp_bsd_compat (read and write)
icmp_xmit_hiwat (read and write)
icmp_xmit_lowat (read and write)
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