FreeBSD Manual Pages
UNW_GE...O_BY_IP(3libunwind) Programming Library UNW_GE...O_BY_IP(3libunwind) 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 proce- dure, 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 following 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 argu- ment 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 ac- cessing 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 always 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, dis- contiguous 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_by_ip() 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_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_by_ip() may return any error returned by the access_mem() callback (see unw_create_addr_space(3libunwind)). SEE ALSO libunwind(3libunwind), unw_create_addr_space(3libunwind), unw_get_proc_name(3libunwind), unw_get_proc_info(3libunwind), unw_init_re- mote(3libunwind) AUTHOR David Mosberger-Tang Email: dmosberger@gmail.com WWW: http://www.nongnu.org/libunwind/. Programming Library 29 August 2023 UNW_GE...O_BY_IP(3libunwind)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | THREAD AND SIGNAL SAFETY | ERRORS | SEE ALSO | AUTHOR
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=unw_get_proc_info_by_ip&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>