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unw_init_remote(3) [debian man page]

UNW_INIT_REMOTE(3)					       Programming Library						UNW_INIT_REMOTE(3)

NAME
unw_init_remote -- initialize cursor for remote unwinding SYNOPSIS
#include <libunwind.h> int unw_init_remote(unw_cursor_t *c, unw_addr_space_t as, void *arg); DESCRIPTION
The unw_init_remote() routine initializes the unwind cursor pointed to by c for unwinding in the address space identified by as. The as argument can either be set to unw_local_addr_space (local address space) or to an arbitrary address space created with unw_cre- ate_addr_space(). The arg void-pointer tells the address space exactly what entity should be unwound. For example, if unw_local_addr_space is passed in as, then arg needs to be a pointer to a context structure containing the machine-state of the initial stack frame. However, other address-spa- ces may instead expect a process-id, a thread-id, or a pointer to an arbitrary structure which identifies the stack-frame chain to be unwound. In other words, the interpretation of arg is entirely dependent on the address-space in use; libunwind never interprets the argu- ment in any way on its own. Note that unw_init_remote() can be used to initiate unwinding in any process, including the local process in which the unwinder itself is running. However, for local unwinding, it is generally preferable to use unw_init_local() instead, because it is easier to use and because it may perform better. RETURN VALUE
On successful completion, unw_init_remote() returns 0. Otherwise the negative value of one of the error-codes below is returned. THREAD AND SIGNAL SAFETY
unw_init_remote() is thread-safe. If the local address-space is passed in argument as, this routine is also safe to use from a signal han- dler. ERRORS
UNW_EINVAL unw_init_remote() was called in a version of libunwind which supports local unwinding only (this normally happens when defining UNW_LOCAL_ONLY before including <libunwind.h> and then calling unw_init_remote()). UNW_EUNSPEC An unspecified error occurred. UNW_EBADREG A register needed by unw_init_remote() wasn't accessible. SEE ALSO
libunwind(3), unw_create_addr_space(3), unw_init_local(3) AUTHOR
David Mosberger-Tang Email: dmosberger@gmail.com WWW: http://www.nongnu.org/libunwind/. Programming Library 16 August 2007 UNW_INIT_REMOTE(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)

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