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\\_GET\\_PROC\\_INFO" "3" "31 March 2003" "Programming Library " "Programming Library "
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.SH NAME
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unw_get_proc_info
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\-\- get 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_get_proc_info(unw_cursor_t *cp,
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unw_proc_info_t *pip);
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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()
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routine returns auxiliary
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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 pip
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argument is a pointer
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to a structure of type unw_proc_info_t
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which is used to
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return the information. The unw_proc_info_t
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has the
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following members:
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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 procedure. If this address cannot be determined
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(e.g., due to lack of unwind information), the start_ip
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member is cleared to 0.
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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 procedure. If this address
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cannot be determined (e.g., due to lack of unwind information),
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the end_ip
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member is cleared to 0.
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.br
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.TP
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unw_word_t lsda
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The address of the
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language\-specific data\-area (LSDA). This area normally contains
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language\-specific information needed during exception handling. If
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the procedure has no such area, this member is cleared to 0.
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.br
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.TP
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unw_word_t handler
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The address of the exception
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handler routine. This is sometimes called the \fIpersonality\fP
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routine. If the procedure does not define
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a personality routine, the handler
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member is cleared to 0.
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.br
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.TP
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unw_word_t gp
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The global\-pointer of the
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procedure. On platforms that do not use a global pointer, this
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member may contain an undefined value. On all other platforms, it
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must be set either to the correct global\-pointer value of the
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procedure or to 0 if the proper global\-pointer cannot be
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obtained for some reason.
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.br
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.TP
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unw_word_t flags
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A set of flags. There are
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currently no target\-independent flags. For the IA\-64 target, the
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flag UNW_PI_FLAG_IA64_RBS_SWITCH
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is set if the
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procedure may switch the register\-backing store.
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.br
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.TP
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int format
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The format of the unwind\-info for this
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procedure. If the unwind\-info consists of dynamic procedure info,
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format
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is equal to UNW_INFO_FORMAT_DYNAMIC\&.
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If the
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unwind\-info consists of a (target\-specific) unwind table, it is
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equal to to UNW_INFO_FORMAT_TABLE\&.
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All other values are
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reserved for future use by libunwind\&.
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This member exists
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for use by the find_proc_info()
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call\-back (see
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unw_create_addr_space(3)).
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The
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unw_get_proc_info()
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routine
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may return an undefined value in this member.
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.br
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.TP
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int unwind_info_size
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The size of the unwind\-info
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in bytes. This member exists for use by the
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find_proc_info()
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call\-back (see
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unw_create_addr_space(3)).
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The
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unw_get_proc_info()
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routine
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may return an undefined value in this member.
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.br
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.TP
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void *unwind_info
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The pointer to the unwind\-info.
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If no unwind info is available, this member must be set to
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NULL\&.
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This member exists for use by the
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find_proc_info()
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call\-back (see
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unw_create_addr_space(3)).
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The
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unw_get_proc_info()
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routine
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may return an undefined value in this member.
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.br
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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()
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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_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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.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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