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get_kernel_syms(2) — Linux manual page

get_kernel_syms(2)         System Calls Manualget_kernel_syms(2)

NAME        top

       get_kernel_syms - retrieve exported kernel and module symbols

SYNOPSIS        top

#include <linux/module.h>[[deprecated]] int get_kernel_syms(struct kernel_sym *table);

DESCRIPTION        top

Note: This system call is present only before Linux 2.6.       Iftable is NULL,get_kernel_syms() returns the number of symbols       available for query.  Otherwise, it fills in a table of       structures:           struct kernel_sym {               unsigned long value;               char          name[60];           };       The symbols are interspersed with magic symbols of the form#module-name with the kernel having an empty name.  The value       associated with a symbol of this form is the address at which the       module is loaded.       The symbols exported from each module follow their magic module       tag and the modules are returned in the reverse of the order in       which they were loaded.

RETURN VALUE        top

       On success, returns the number of symbols copied totable.  On       error, -1 is returned anderrno is set to indicate the error.

ERRORS        top

       There is only one possible error return:ENOSYS get_kernel_syms() is not supported in this version of the              kernel.

STANDARDS        top

       Linux.

HISTORY        top

       Removed in Linux 2.6.       This obsolete system call is not supported by glibc.  No       declaration is provided in glibc headers, but, through a quirk of       history, glibc versions before glibc 2.23 did export an ABI for       this system call.  Therefore, in order to employ this system call,       it was sufficient to manually declare the interface in your code;       alternatively, you could invoke the system call usingsyscall(2).

BUGS        top

       There is no way to indicate the size of the buffer allocated fortable.  If symbols have been added to the kernel since the program       queried for the symbol table size, memory will be corrupted.       The length of exported symbol names is limited to 59 characters.       Because of these limitations, this system call is deprecated in       favor ofquery_module(2) (which is itself nowadays deprecated in       favor of other interfaces described on its manual page).

SEE ALSO        top

create_module(2),delete_module(2),init_module(2),query_module(2)

COLOPHON        top

       This page is part of theman-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-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  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 isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17get_kernel_syms(2)

Pages that refer to this page:query_module(2), syscalls(2)

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