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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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getunwind(2) System Calls Manual getunwind(2)
getunwind - copy the unwind data to caller's buffer
Standard C library (libc, -lc)
#include <linux/unwind.h>
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
[[deprecated]] long syscall(SYS_getunwind, void buf[.buf_size],
size_t buf_size);
Note: this system call is obsolete.
The IA-64-specific getunwind() system call copies the kernel's
call frame unwind data into the buffer pointed to by buf and
returns the size of the unwind data; this data describes the gate
page (kernel code that is mapped into user space).
The size of the buffer buf is specified in buf_size. The data is
copied only if buf_size is greater than or equal to the size of
the unwind data and 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.
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:
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)
An entry whose start value is zero indicates the end of the
table. For more information about the format, see the IA-64
Software Conventions and Runtime Architecture manual.
On success, getunwind() returns the size of the unwind data. On
error, -1 is returned and errno is set to indicate the error.
getunwind() fails with the error EFAULT if the unwind info can't
be stored in the space specified by buf.
Linux on IA-64.
Linux 2.4.
This system call has been deprecated. The modern way to obtain
the kernel's unwind data is via the vdso(7).
getauxval(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 getunwind(2)
Pages that refer to this page: syscalls(2)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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