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UNW_GE...E_BY_IP(3libunwind) Programming Library UNW_GE...E_BY_IP(3libunwind) NAME unw_get_proc_name_by_ip -- get procedure name SYNOPSIS #include <libunwind.h> int unw_get_proc_name_by_ip(unw_addr_space_t as, unw_word_t ip, char *bufp, size_t len, unw_word_t *offp, void *arg); DESCRIPTION The unw_get_proc_name_by_ip() routine returns the name of a procedure just like unw_get_proc_name(), except that the name is looked up by instruction pointer (IP) instead of a cursor. 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 name should be looked up. The bufp argument is a pointer to a character buffer that is at least len bytes long. This buffer is used to return the name of the pro- cedure. The offp argument is a pointer to a word that is used to return the byte offset of the instruction-pointer relative to the start of the proce- dure. 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 ar- gument. Note that on some platforms there is no reliable way to distinguish between procedure names and ordinary labels. Furthermore, if symbol information has been stripped from a program, procedure names may be completely unavailable or may be limited to those exported via a dynamic symbol table. In such cases, unw_get_proc_name_by_ip() may return the name of a label or a pre- ceding (nearby) procedure. However, the offset returned through offp is al- ways relative to the returned name, which ensures that the value (address) of the returned name plus the returned offset will always be equal to the instruction pointer ip. RETURN VALUE On successful completion, unw_get_proc_name_by_ip() returns 0. Otherwise the negative value of one of the error codes below is returned. THREAD AND SIGNAL SAFETY unw_get_proc_name_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 determine the name of the procedure. UNW_ENOMEM The procedure name is too long to fit in the buffer provided. A truncated version of the name has been returned. In addition, unw_get_proc_name_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_init_remote(3libunwind) AUTHOR David Mosberger-Tang Email: dmosberger@gmail.com WWW: http://www.nongnu.org/libunwind/. Programming Library 29 August 2023 UNW_GE...E_BY_IP(3libunwind)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | THREAD AND SIGNAL SAFETY | ERRORS | SEE ALSO | AUTHOR
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