01-26-2011
Wowza, that using an int for a pointer is always ready to bite in the worst times! Plus with AIX's 64 bit model not all pointers have 64 bits worth of data (so sometimes it'll crash and sometimes it'll work great). We found out the hard way, pointers in shared memory were always having issues and it was all because we forgot a header and when you do that the compiler assumes all function arguments are int and truncates as appropriate. Plus, it didn't even complain that the function was used but not defined and didn't until we asked it to warn for everything (at which point we found our devs missed a few other headers, lol).
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LEARN ABOUT NETBSD
kvm_dump_inval
KVM_DUMP(3) BSD Library Functions Manual KVM_DUMP(3)
NAME
kvm_dump_mkheader, kvm_dump_wrtheader, kvm_dump_inval -- crash dump support functions
LIBRARY
Kernel Data Access Library (libkvm, -lkvm)
SYNOPSIS
#include <kvm.h>
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);
DESCRIPTION
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 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).
RETURN VALUES
All functions except kvm_dump_mkheader() return 0 on success, -1 on failure. The function kvm_dump_mkheader() returns the size of the head-
ers 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.
SEE ALSO
kvm(3), kvm_open(3)
HISTORY
These functions first appeared in NetBSD 1.2.
BSD
March 17, 1996 BSD