libunwind-eh_elf/doc/unw_get_proc_info.man

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.TH "UNW\\_GET\\_PROC\\_INFO" "3" "12 March 2003" "Programming Library " "Programming Library "
.SH NAME

.PP
unw_get_proc_info \-\- get info on current procedure 
.PP
.SH SYNOPSIS

.PP
#include <libunwind.h>
.br
.PP
int
unw_get_proc_info(unw_cursor_t *cp,
unw_proc_info_t *pip);
.br
.PP
.SH DESCRIPTION

.PP
The unw_get_proc_info()
routine returns auxiliary 
information about the procedure that created the stack frame 
identified by argument cp\&.
The pip
argument is a pointer 
to a structure of type unw_proc_info_t
which is used to 
return the information. The unw_proc_info_t
has the 
following members: 
.TP
unw_word_t start_ip
 The address of the first 
instruction of the procedure. If this address cannot be determined 
(e.g., due to lack of unwind information), the start_ip
member is cleared to 0. 
.br 
.TP
unw_word_t end_ip
 The address of the first 
instruction \fIbeyond\fP
the end of the procedure. If this address 
cannot be determined (e.g., due to lack of unwind information), 
the end_ip
member is cleared to 0. 
.br 
.TP
unw_word_t lsda
 The address of the 
language\-specific data\-area (LSDA). This area normally contains 
language\-specific information needed during exception handling. If 
the procedure has no such area, this member is cleared to 0. 
.br 
.TP
unw_word_t handler
 The address of the exception 
handler routine. This is sometimes called the \fIpersonality\fP
routine. If the procedure does not define 
a personality routine, the handler
member is cleared to 0. 
.br 
.TP
unw_word_t gp
 The global\-pointer of the 
procedure. On platforms that do not use a global pointer, this 
member may contain an undefined value. On all other platforms, it 
must be set either to the correct global\-pointer value of the 
procedure or to 0 if the proper global\-pointer cannot be 
obtained for some reason. 
.br 
.TP
unw_word_t flags
 A set of flags. There are 
currently no target\-independent flags. For the IA\-64 target, the 
flag UNW_PI_FLAG_IA64_RBS_SWITCH
is set if the 
procedure may switch the register\-backing store.
.br 
.TP
int format
 The format of the unwind\-info for this 
procedure. If the unwind\-info consists of dynamic procedure info, 
format
is equal to UNW_INFO_FORMAT_DYNAMIC\&.
If the 
unwind\-info consists of a (target\-specific) unwind table, it is 
equal to to UNW_INFO_FORMAT_TABLE\&.
All other values are 
reserved for future use by libunwind\&.
This member exists 
for use by the find_proc_info()
call\-back (see 
unw_create_addr_space(3)).
The 
unw_get_proc_info()
routine 
may return an undefined value in this member. 
.br 
.TP
int unwind_info_size
 The size of the unwind\-info 
in bytes. This member exists for use by the 
find_proc_info()
call\-back (see 
unw_create_addr_space(3)).
The 
unw_get_proc_info()
routine 
may return an undefined value in this member.
.br 
.TP
void *unwind_info
 The pointer to the unwind\-info. 
If no unwind info is available, this member must be set to 
NULL\&.
This member exists for use by the 
find_proc_info()
call\-back (see 
unw_create_addr_space(3)).
The 
unw_get_proc_info()
routine 
may return an undefined value in this member.
.br 
.PP
Note that for the purposes of libunwind,
the code of a 
procedure is assumed to occupy a single, contiguous range of 
addresses. For this reason, it is alwas possible to describe the 
extent of a procedure with the start_ip
and end_ip
members. If a single function/routine is split into multiple, 
discontiguous pieces, libunwind
will treat each piece as a 
separate procedure. 
.PP
.SH RETURN VALUE

.PP
On successful completion, unw_get_proc_info()
returns 0. 
Otherwise the negative value of one of the error\-codes below is 
returned. 
.PP
.SH THREAD AND SIGNAL SAFETY

.PP
unw_get_proc_info()
is thread\-safe as well as safe to use 
from a signal handler. 
.PP
.SH ERRORS

.PP
.TP
UNW_EUNSPEC
 An unspecified error occurred. 
.TP
UNW_ENOINFO
 Libunwind
was unable to locate 
unwind\-info for the procedure. 
.TP
UNW_EBADVERSION
 The unwind\-info for the procedure has 
version or format that is not understood by libunwind\&.
.PP
In addition, unw_get_proc_info()
may return any error 
returned by the access_mem()
call\-back (see 
unw_create_addr_space(3)).
.PP
.SH SEE ALSO

.PP
libunwind(3),
unw_create_addr_space(3),
unw_get_proc_name(3)
.PP
.SH AUTHOR

.PP
David Mosberger\-Tang
.br 
Hewlett\-Packard Labs
.br 
Palo\-Alto, CA 94304
.br 
Email: \fBdavidm@hpl.hp.com\fP
.br
WWW: \fBhttp://www.hpl.hp.com/research/linux/libunwind/\fP\&.
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