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40 .Nd initialize kernel virtual memory access
47 .Fn kvm_open "const char *execfile" "const char *corefile" "const char *swapfile" "int flags" "const char *errstr"
50 .Fa "const char *execfile"
51 .Fa "const char *corefile"
54 .Fa "int (*resolver)(const char *name, kvaddr_t *addr)"
57 .Fn kvm_openfiles "const char *execfile" "const char *corefile" "const char *swapfile" "int flags" "char *errbuf"
59 .Fn kvm_close "kvm_t *kd"
66 return a descriptor used to access kernel virtual memory
70 Both active kernels and crash dumps are accessible
71 through this interface.
75 argument is the executable image of the kernel being examined.
76 This file must contain a symbol table.
79 the currently running system is assumed,
85 argument is the kernel memory device file.
88 or a crash dump core generated by
94 the default indicated by
99 It can also be set to a special value
103 that do not directly access kernel memory.
107 argument is currently unused.
111 argument indicates read/write access as in
113 and applies only to the core file.
123 library provides two different error reporting mechanisms.
124 One provides backward compatibility with the SunOS kvm library, while the
125 other provides an improved error reporting framework.
126 The mechanism used by a descriptor is determined by the function used to
131 function is the Sun kvm compatible open call.
134 argument indicates how errors should be handled.
137 no errors are reported and the application cannot know the
138 specific nature of the failed kvm call.
141 errors are printed to
145 prepended to the message, as in
147 Normally, the name of the program is used here.
148 The string is assumed to persist at least until the corresponding
158 style error reporting.
159 Here, error messages are not printed out by the library.
160 Instead, the application obtains the error message
161 corresponding to the most recent kvm library call using
165 The results are undefined if the most recent kvm call did not produce
169 requires a kvm descriptor, but the open routines return
173 cannot be used to get the error message if open fails.
178 will place any error message in the
181 This buffer should be _POSIX2_LINE_MAX characters large (from
186 argument points to a function used by the
188 library to map symbol names to kernel virtual addresses.
193 specifies the requested symbol name.
194 If the function is able to resolve the name to an address,
195 the address should be set in
197 and the function should return zero.
198 If the function is not able to resolve the name to an address,
199 it should return a non-zero value.
200 When opening a native kernel image,
204 to use an internal function to resolve symbol names.
205 Non-native kernel images
206 .Pq such as when cross-debugging a crash dump
215 functions return a descriptor to be used
216 in all subsequent kvm library calls.
217 The library is fully re-entrant.
220 is returned, in which case
224 write the error message into
231 function may fail and set the global variable
233 for any of the errors specified for
238 function may also fail and set
263 There should not be three open calls.
264 The ill-defined error semantics
265 of the Sun library and the desire to have a backward-compatible library
272 function first appeared in