2003-04-01 09:19:34 +02:00
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.\" Manual page created with latex2man on Mon Mar 31 14:18:02 PST 2003
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.\" NOTE: This file is generated, DO NOT EDIT.
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.de Vb
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.ft CW
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.nf
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..
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.de Ve
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.ft R
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.fi
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..
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.TH "UNW\\_INIT\\_LOCAL" "3" "31 March 2003" "Programming Library " "Programming Library "
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.SH NAME
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unw_init_local
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\-\- initialize cursor for local unwinding
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.PP
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.SH SYNOPSIS
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.PP
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#include <libunwind.h>
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.br
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.PP
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int
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unw_init_local(unw_cursor_t *c,
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unw_context_t *ctxt);
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.br
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.PP
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.SH DESCRIPTION
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.PP
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The unw_init_local()
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routine initializes the unwind cursor
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pointed to by c
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with the machine\-state in the context structure
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pointed to by ctxt\&.
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As such, the machine\-state pointed to by
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ctxt
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identifies the initial stack frame at which unwinding
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starts. The machine\-state must remain valid for the duration for
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which the cursor c
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is in use.
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.PP
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The unw_init_local()
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routine can be used only for unwinding in
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the address space of the current process (i.e., for local unwinding).
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For all other cases, unw_init_remote()
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must be used instead.
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From a behavioral point of view, the call:
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.PP
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.Vb
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ret = unw_init_local(&cursor, &ucontext);
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.Ve
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is equivalent to:
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.PP
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.Vb
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ret = unw_init_remote(&cursor, unw_local_addr_space,
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&ucontext);
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.Ve
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However, unwind performance may be better when using
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unw_init_local().
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Also, unw_init_local()
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is
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available even when UNW_LOCAL_ONLY
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has been defined before
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including <libunwind.h>,
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whereas unw_init_remote()
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is not.
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.PP
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.SH RETURN VALUE
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.PP
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On successful completion, unw_init_local()
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returns 0.
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Otherwise the negative value of one of the error\-codes below is
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returned.
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.PP
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.SH THREAD AND SIGNAL SAFETY
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.PP
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unw_init_local()
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is thread\-safe as well as safe to use from a
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signal handler.
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.PP
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.SH ERRORS
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.PP
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.TP
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UNW_EINVAL
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unw_init_local()
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was called in a
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version of libunwind
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which supports remote unwinding only
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(this normally happens when calling unw_init_local()
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for a
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cross\-platform version of libunwind).
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.TP
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UNW_EUNSPEC
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An unspecified error occurred.
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.TP
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UNW_EBADREG
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A register needed by unw_init_local()
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wasn\&'t accessible.
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.PP
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.SH SEE ALSO
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.PP
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libunwind(3),
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unw_init_remote(3)
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.PP
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.SH AUTHOR
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.PP
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David Mosberger\-Tang
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.br
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Hewlett\-Packard Labs
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.br
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Palo\-Alto, CA 94304
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.br
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Email: \fBdavidm@hpl.hp.com\fP
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.br
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WWW: \fBhttp://www.hpl.hp.com/research/linux/libunwind/\fP\&.
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.\" NOTE: This file is generated, DO NOT EDIT.
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