_U_DYN_REGISTER(3) Programming Library _U_DYN_REGISTER(3)NAME
_U_dyn_register -- register unwind-info for dynamically generated code
SYNOPSIS
#include <libunwind.h>
void _U_dyn_register(unw_dyn_info_t *di);
DESCRIPTION
The _U_dyn_register() routine registers unwind-info for a dynamically generated procedure. The procedure's unwind-info is described by a
structure of type unw_dyn_info_t (see libunwind-dynamic(3)). A pointer to this structure is passed in argument di.
The _U_dyn_register() routine is guaranteed to execute in constant time (in the absence of contention from concurrent calls to _U_dyn_reg-
ister() or _U_dyn_cancel()).
THREAD AND SIGNAL SAFETY
_U_dyn_register() is thread-safe but not safe to use from a signal handler.
SEE ALSO libunwind-dynamic(3), _U_dyn_cancel(3)AUTHOR
David Mosberger-Tang
Email: dmosberger@gmail.com
WWW: http://www.nongnu.org/libunwind/.
Programming Library 16 August 2007 _U_DYN_REGISTER(3)
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UNW_GET_PROC_INFO_BY_IP(3) Programming Library UNW_GET_PROC_INFO_BY_IP(3)NAME
unw_get_proc_info_by_ip -- get procedure info by IP
SYNOPSIS
#include <libunwind.h>
int unw_get_proc_info_by_ip(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pip, void *arg);
DESCRIPTION
The unw_get_proc_info_by_ip() routine returns the same kind of auxiliary information about a procedure as unw_get_proc_info(), except that
the info is looked up by instruction-pointer (IP) instead of a cursor. This is more flexible because it is possible to look up the info for
an arbitrary procedure, even if it is not part of the current call-chain. However, since it is more flexible, it also tends to run slower
(and often much slower) than unw_get_proc_info().
The routine expects the followins arguments: as is the address-space in which the instruction-pointer should be looked up. For a look-up
in the local address-space, unw_local_addr_space can be passed for this argument. Argument ip is the instruction-pointer for which the
procedure info should be looked up and pip is a pointer to a structure of type unw_proc_info_t which is used to return the info. Lastly,
arg is the address-space argument that should be used when accessing the address-space. It has the same purpose as the argument of the same
name for unw_init_remote(). When accessing the local address-space (first argument is unw_local_addr_space), NULL must be passed for this
argument.
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.
RETURN VALUE
On successful completion, unw_get_proc_info_by_ip() returns 0. Otherwise the negative value of one of the error-codes below is returned.
THREAD AND SIGNAL SAFETY
unw_get_proc_info() is thread-safe. If the local address-space is passed in argument as, this routine is also safe to use from a signal
handler.
ERRORS
UNW_EUNSPEC
An unspecified error occurred.
UNW_ENOINFO
Libunwind was unable to locate unwind-info for the procedure.
UNW_EBADVERSION
The unwind-info for the procedure has version or format that is not understood by libunwind.
In addition, unw_get_proc_info() may return any error returned by the access_mem() call-back (see unw_create_addr_space(3)).
SEE ALSO libunwind(3), unw_create_addr_space(3), unw_get_proc_name(3), unw_get_proc_info(3), unw_init_remote(3)AUTHOR
David Mosberger-Tang
Email: dmosberger@gmail.com
WWW: http://www.nongnu.org/libunwind/.
Programming Library 16 August 2007 UNW_GET_PROC_INFO_BY_IP(3)