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36 .\" @(#)kvm_open.3 8.3 (Berkeley) 4/19/94
37 .\" $FreeBSD: src/lib/libkvm/kvm_open.3,v 1.5.2.6 2001/12/17 10:08:30 ru Exp $
38 .\" $DragonFly: src/lib/libkvm/kvm_open.3,v 1.2 2003/06/17 04:26:49 dillon Exp $
47 .Nd initialize kernel virtual memory access
54 .Fn kvm_open "const char *execfile" "const char *corefile" "const char *swapfile" "int flags" "const char *errstr"
56 .Fn kvm_openfiles "const char *execfile" "const char *corefile" "const char *swapfile" "int flags" "char *errbuf"
58 .Fn kvm_close "kvm_t *kd"
64 return a descriptor used to access kernel virtual memory
67 library routines. Both active kernels and crash dumps are accessible
68 through this interface.
71 is the executable image of the kernel being examined.
72 This file must contain a symbol table.
75 the currently running system is assumed,
80 is the kernel memory device file. It can be either /dev/mem
81 or a crash dump core generated by
87 the default indicated by
89 from <paths.h> is used.
92 should indicate the swap device. If
95 from <paths.h> is used.
99 argument indicates read/write access as in
101 and applies only to the core file.
109 There are two open routines which differ only with respect to
111 One provides backward compatibility with the SunOS kvm library, while the
112 other provides an improved error reporting framework.
116 function is the Sun kvm compatible open call. Here, the
118 argument indicates how errors should be handled. If it is
120 no errors are reported and the application cannot know the
121 specific nature of the failed kvm call.
124 errors are printed to stderr with
126 prepended to the message, as in
128 Normally, the name of the program is used here.
129 The string is assumed to persist at least until the corresponding
137 style error reporting.
138 Here, error messages are not printed out by the library.
139 Instead, the application obtains the error message
140 corresponding to the most recent kvm library call using
144 The results are undefined if the most recent kvm call did not produce
148 requires a kvm descriptor, but the open routines return
152 cannot be used to get the error message if open fails.
155 will place any error message in the
157 argument. This buffer should be _POSIX2_LINE_MAX characters large (from
164 functions both return a descriptor to be used
165 in all subsequent kvm library calls.
166 The library is fully re-entrant.
169 is returned, in which case
171 writes the error message into
176 function returns 0 on success and -1 on failure.
178 There should not be two open calls. The ill-defined error semantics
179 of the Sun library and the desire to have a backward-compatible library