2003-04-01 09:19:34 +02:00
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.\" Manual page created with latex2man on Mon Mar 31 14:25:06 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\\_STEP" "3" "31 March 2003" "Programming Library " "Programming Library "
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.SH NAME
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unw_step
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\-\- advance to next stack frame
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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_step(unw_cursor_t *cp);
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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_step()
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routine advances the unwind cursor cp
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to
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the next older, less deeply nested stack frame.
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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_step()
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returns a positive value
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if there are more stack frames in the call\-chain, or 0 if the returned
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stack frame is the last frame in the chain. On error, the negative
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value of one of the error\-codes below is 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_step()
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is thread\-safe as well as safe to use
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from a 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_EUNSPEC
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An unspecified error occurred.
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.TP
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UNW_ENOINFO
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Libunwind
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was unable to locate the
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unwind\-info needed to complete the operation.
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.TP
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UNW_EBADVERSION
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The unwind\-info needed to complete the
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operation has a version or a format that is not understood by
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libunwind\&.
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.TP
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UNW_EINVALIDIP
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The instruction\-pointer
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(``program\-counter\&'') of the next stack frame is invalid (e.g., not
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properly aligned).
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.TP
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UNW_EBADFRAME
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The next stack frame is invalid.
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.TP
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UNW_ESTOPUNWIND
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Returned if a call to
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find_proc_info()
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returned \-UNW_ESTOPUNWIND\&.
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.PP
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In addition, unw_step()
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may return any error returned by the
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find_proc_info(),
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get_dyn_info_list_addr(),
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access_mem(),
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access_reg(),
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or access_fpreg()
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call\-backs (see unw_create_addr_space(3)).
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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_create_addr_space(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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