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137 lines
2.9 KiB
Groff
137 lines
2.9 KiB
Groff
'\" t
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.\" Manual page created with latex2man on Wed Aug 16 11:09:44 PDT 2017
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.\" NOTE: This file is generated, DO NOT EDIT.
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.de Vb
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..
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..
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.TH "UNW\\_REG\\_STATES\\_ITERATE" "3" "16 August 2017" "Programming Library " "Programming Library "
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.SH NAME
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unw_reg_states_iterate
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\-\- get register state info on current procedure
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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_reg_states_iterate(unw_cursor_t *cp,
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unw_reg_states_callbackcb,
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void *token);
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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_reg_states_iterate()
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routine provides
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information about the procedure that created the stack frame
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identified by argument cp\&.
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The cb
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argument is a pointer
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to a function of type unw_reg_states_callback
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which is used to
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return the information. The function unw_reg_states_callback
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has the
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following definition:
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.PP
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int
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( *unw_reg_states_callback)(void *token,
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void *reg_states_data,
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size_t
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reg_states_data_size,
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unw_word_t
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start_ip,
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unw_word_t
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end_ip);
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.PP
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The callback function may be invoked several times for each call of unw_reg_states_iterate\&.
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Each call is associcated with a instruction address range and a set of instructions on how to update register values when returning from the procedure in that address range. For each invocation, the arguments to the callback function are:
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.TP
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void * token
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The token value passed to unw_reg_states_callback\&.
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.br
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.TP
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void * reg_states_data
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A pointer to data about
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updating register values. This data, or a copy of it, can be passed
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to unw_apply_reg_state\&.
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.br
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.TP
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int reg_states_data_size
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The size of the register update data.
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.br
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.TP
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unw_word_t start_ip
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The address of the first
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instruction of the address range.
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.br
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.TP
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unw_word_t end_ip
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The address of the first
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instruction \fIbeyond\fP
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the end of the address range.
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.br
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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_reg_states_iterate()
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returns
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0. If the callback function returns a nonzero value, that indicates
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failure and the function returns immediately. Otherwise 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_reg_states_iterate()
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is thread\-safe. If cursor cp
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is
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in the local address\-space, this routine is also 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_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
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unwind\-info for the procedure.
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.TP
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UNW_EBADVERSION
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The unwind\-info for the procedure has
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version or format that is not understood by libunwind\&.
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.PP
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In addition, unw_reg_states_iterate()
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may return any error
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returned by the access_mem()
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call\-back (see
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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_apply_reg_state(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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Email: \fBdmosberger@gmail.com\fP
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.br
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WWW: \fBhttp://www.nongnu.org/libunwind/\fP\&.
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.\" NOTE: This file is generated, DO NOT EDIT.
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