NetBSD 6.1.5 - man page for kvm_dump_inval (netbsd section 3)
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KVM_DUMP(3) BSD Library Functions Manual KVM_DUMP(3)
kvm_dump_mkheader, kvm_dump_wrtheader, kvm_dump_inval -- crash dump support functions
Kernel Data Access Library (libkvm, -lkvm)
kvm_dump_mkheader(kvm_t *kd, off_t dump_off);
kvm_dump_wrtheader(kvm_t *kd, FILE *fp, int dumpsize);
First note that the functions described here were designed to be used by savecore(8).
The function kvm_dump_mkheader() checks if the physical memory file associated with kd con-
tains a valid crash dump header as generated by a dumping kernel. When a valid header is
found, kvm_dump_mkheader() initializes the internal kvm data structures as if a crash dump
generated by the savecore(8) program was opened. This has the intentional side effect of
enabling the address translation machinery.
A call to kvm_dump_mkheader() will most likely be followed by a call to
kvm_dump_wrtheader(). This function takes care of generating the generic header, the
CORE_CPU section and the section header of the CORE_DATA section. The data is written to
the file pointed at by fp. The dumpsize argument is only used to properly the set the seg-
ment size of the CORE_DATA section. Note that this function assumes that fp is positioned
at file location 0. This function will not seek and therefore allows fp to be a file
pointer obtained by zopen().
The kvm_dump_inval() function clears the magic number in the physical memory file associated
with kd. The address translations must be enabled for this to work (thus assuming that
kvm_dump_mkheader() was called earlier in the sequence).
All functions except kvm_dump_mkheader() return 0 on success, -1 on failure. The function
kvm_dump_mkheader() returns the size of the headers present before the actual dumpdata
starts. If no valid headers were found but no fatal errors occurred, 0 is returned. On
fatal errors the return value is -1.
In the case of failure, kvm_geterr(3) can be used to retrieve the cause of the error.
These functions first appeared in NetBSD 1.2.
BSD March 17, 1996 BSD
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