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.\" Manual page created with latex2man on Mon Aug 30 08:48:42 CEST 2021
.\" NOTE: This file is generated, DO NOT EDIT.
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.TH "UNW\\_GET\\_PROC\\_NAME\\_BY\\_IP" "3" "30 August 2021" "Programming Library " "Programming Library "
.SH NAME
unw_get_proc_name_by_ip
\-\- get procedure name
.PP
.SH SYNOPSIS
.PP
#include <libunwind.h>
.br
.PP
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);
.br
.PP
.SH DESCRIPTION
.PP
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.
.PP
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 procedure. 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 procedure.
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.
.PP
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 preceding (nearby) procedure. However, the offset returned
through offp
is always 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\&.
.PP
.SH RETURN VALUE
.PP
On successful completion, unw_get_proc_name_by_ip()
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_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 handler.
.PP
.SH ERRORS
.PP
.TP
UNW_EUNSPEC
An unspecified error occurred.
.TP
UNW_ENOINFO
Libunwind
was unable to determine
the name of the procedure.
.TP
UNW_ENOMEM
The procedure name is too long to fit
in the buffer provided. A truncated version of the name has been
returned.
.PP
In addition, unw_get_proc_name_by_ip()
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),
unw_init_remote(3)
.PP
.SH AUTHOR
.PP
David Mosberger\-Tang
.br
Email: \fBdmosberger@gmail.com\fP
.br
WWW: \fBhttp://www.nongnu.org/libunwind/\fP\&.
.\" NOTE: This file is generated, DO NOT EDIT.
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