2003-12-04 08:34:21 +01:00
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.\" Manual page created with latex2man on Wed Dec 3 16:36:46 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\\_GET\\_PROC\\_INFO\\_BY\\_IP" "3" "03 December 2003" "Programming Library " "Programming Library "
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.SH NAME
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unw_get_proc_info_by_ip
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\-\- get procedure info by IP
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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_get_proc_info_by_ip(unw_addr_space_t as,
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unw_word_t ip,
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unw_proc_info_t *pip,
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void *arg);
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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_get_proc_info_by_ip()
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routine returns the same
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kind of auxiliary information about a procedure as
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unw_get_proc_info(),
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except that the info is looked up by
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instruction\-pointer (IP) instead of a cursor. This is more flexible
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because it is possible to look up the info for an arbitrary procedure,
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even if it is not part of the current call\-chain. However, since it
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is more flexible, it also tends to run slower (and often much slower)
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than unw_get_proc_info().
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.PP
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The routine expects the followins arguments: as
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is the
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address\-space in which the instruction\-pointer should be looked up.
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For a look\-up in the local address\-space,
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unw_local_addr_space
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can be passed for this argument.
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Argument ip
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is the instruction\-pointer for which the procedure
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info should be looked up and pip
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is a pointer to a structure of
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type unw_proc_info_t
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which is used to return the info.
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Lastly, arg
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is the address\-space argument that should be used
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when accessing the address\-space. It has the same purpose as the
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argument of the same name for unw_init_remote().
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When
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accessing the local address\-space (first argument is
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unw_local_addr_space),
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NULL
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must be passed for this
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argument.
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.PP
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Note that for the purposes of libunwind,
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the code of a
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procedure is assumed to occupy a single, contiguous range of
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addresses. For this reason, it is alwas possible to describe the
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extent of a procedure with the start_ip
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and end_ip
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members. If a single function/routine is split into multiple,
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discontiguous pieces, libunwind
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will treat each piece as a
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separate procedure.
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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_get_proc_info_by_ip()
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returns 0. Otherwise the negative value of one of the error\-codes
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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_get_proc_info()
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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
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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_get_proc_info()
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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_create_addr_space(3),
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unw_get_proc_name(3),
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unw_get_proc_info(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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