KVM_DUMP(3) | Library Functions Manual | KVM_DUMP(3) |
int
kvm_dump_mkheader(kvm_t *kd, off_t dump_off);
int
kvm_dump_wrtheader(kvm_t *kd, FILE *fp, int dumpsize);
int
kvm_dump_inval(kvm_t *kd);
The function kvm_dump_mkheader() checks if the physical memory file associated with kd contains 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 segment 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).
In the case of failure, kvm_geterr(3) can be used to retrieve the cause of the error.
March 17, 1996 | NetBSD 7.2 |