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-.\" Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
-.\" Written by Marcela Maslanova <mmaslano@redhat.com>
-.\" and Copyright 2013, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH getunwind 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-getunwind \- copy the unwind data to caller's buffer
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <linux/unwind.h>
-.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
-.B #include <unistd.h>
-.P
-.BI "[[deprecated]] long syscall(SYS_getunwind, void " buf [. buf_size ],
-.BI "                            size_t " buf_size );
-.fi
-.SH DESCRIPTION
-.I Note: this system call is obsolete.
-.P
-The
-IA-64-specific
-.BR getunwind ()
-system call copies the kernel's call frame
-unwind data into the buffer pointed to by
-.I buf
-and returns the size of the unwind data;
-this data describes the gate page (kernel code that
-is mapped into user space).
-.P
-The size of the buffer
-.I buf
-is specified in
-.IR buf_size .
-The data is copied only if
-.I buf_size
-is greater than or equal to the size of the unwind data and
-.I buf
-is not NULL;
-otherwise, no data is copied, and the call succeeds,
-returning the size that would be needed to store the unwind data.
-.P
-The first part of the unwind data contains an unwind table.
-The rest contains the associated unwind information, in no particular order.
-The unwind table contains entries of the following form:
-.P
-.in +4n
-.EX
-u64 start;      (64\-bit address of start of function)
-u64 end;        (64\-bit address of end of function)
-u64 info;       (BUF\-relative offset to unwind info)
-.EE
-.in
-.P
-An entry whose
-.I start
-value is zero indicates the end of the table.
-For more information about the format, see the
-.I IA-64 Software Conventions and Runtime Architecture
-manual.
-.SH RETURN VALUE
-On success,
-.BR getunwind ()
-returns the size of the unwind data.
-On error, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.BR getunwind ()
-fails with the error
-.B EFAULT
-if the unwind info can't be stored in the space specified by
-.IR buf .
-.SH STANDARDS
-Linux on IA-64.
-.SH HISTORY
-Linux 2.4.
-.P
-This system call has been deprecated.
-The modern way to obtain the kernel's unwind data is via the
-.BR vdso (7).
-.SH SEE ALSO
-.BR getauxval (3)