BSD 2.11 - man page for savecore (bsd section 8)
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savecore - save a core dump of the operating system
savecore dirname [ system ]
Savecore is meant to be called at the end of the /etc/rc file. Its function is to save
the core dump of the system (if one was made) and to write a reboot message in the shut-
It saves the core image in the file dirname/core.n and its corresponding namelist in
dirname/unix.n. The second argument is the namelist for the system which made the core
image; the current system is always assumed to be /unix. The trailing ".n" in the path-
names is replaced by a number which grows every time savecore is run in that directory.
Before savecore writes out a core image, it reads a number from the file dirname/minfree.
If there are fewer free blocks on the file system which contains dirname than the number
obtained from the minfree file, the core dump is not done. If the minfree file does not
exist, savecore always writes out the core file (assuming that a core dump was taken).
Savecore also writes a reboot message in the shut down log. If the system crashed as a
result of a panic, savecore records the panic string in the shut down log too.
If savecore detects that the system time is wrong because of a crash (the time in the core
image is after the current time), it will reset the system time to its best estimate of
the time, which is the time in the core image plus the elapsed time since the reboot. It
announces the time that it set when this occurs.
/unix current UNIX
The method used to determine whether a dump is present, and to prevent the same core image
from being saved multiple times, is not elegant. This information should be passed to
init by the system; however, this is difficult because the system may have to be rebooted
a second time if the root filesystem is patched.
3rd Berkeley Distribution SAVECORE(8)
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