05-16-2011
You realize that any system call can cause this context switch? That a system call is in fact a context switch? Running a system call stops the process until the system call finishes! What you're looking for doesn't exist.
Running strace on ifconfig in linux, I see it using ioctl with SIOCSIFADDR, SIOCGIFFLAGS, and SIOCSIFNETMASK.
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:(
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LEARN ABOUT FREEBSD
maclabel
MACLABEL(7) BSD Miscellaneous Information Manual MACLABEL(7)
NAME
maclabel -- Mandatory Access Control label format
DESCRIPTION
If Mandatory Access Control, or MAC, is enabled in the kernel, then in addition to the traditional credentials, each subject (typically a
user or a socket) and object (file system object, socket, etc.) is given a MAC label. The MAC label specifies the necessary subject-specific
or object-specific information necessary for a MAC security policy to enforce access control on the subject/object.
The format for a MAC label is defined as follows:
policy1/qualifier1,policy2/qualifier2,...
A MAC label consists of a policy name, followed by a forward slash, followed by the subject or object's qualifier, optionally followed by a
comma and one or more additional policy labels. For example:
biba/low(low-low)
biba/high(low-high),mls/equal(equal-equal),partition/0
SEE ALSO
mac(3), posix1e(3), mac_biba(4), mac_bsdextended(4), mac_ifoff(4), mac_mls(4), mac_none(4), mac_partition(4), mac_seeotheruids(4),
mac_test(4), login.conf(5), getfmac(8), getpmac(8), ifconfig(8), setfmac(8), setpmac(8), mac(9)
HISTORY
MAC first appeared in FreeBSD 5.0.
AUTHORS
This software was contributed to the FreeBSD Project by NAI Labs, the Security Research Division of Network Associates Inc. under
DARPA/SPAWAR contract N66001-01-C-8035 (``CBOSS''), as part of the DARPA CHATS research program.
BSD
October 25, 2002 BSD