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man:get_kernel_syms

GET_KERNEL_SYMS(2) Linux Programmer's Manual GET_KERNEL_SYMS(2)

NAME

     get_kernel_syms - retrieve exported kernel and module symbols

SYNOPSIS

     #include <linux/module.h>
     int get_kernel_syms(struct kernel_sym *table);
     Note:  No declaration of this system call is provided in glibc headers;
     see NOTES.

DESCRIPTION

     Note: This system call is present only in kernels before Linux 2.6.
     If table 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

     On  success,  returns the number of symbols copied to table.  On error,
     -1 is returned and errno is set appropriately.

ERRORS

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

VERSIONS

     This  system  call is present on Linux only up until kernel 2.4; it was
     removed in Linux 2.6.

CONFORMING TO

     get_kernel_syms() is Linux-specific.

NOTES

     This obsolete system call is not supported by glibc.  No declaration is
     provided  in glibc headers, but, through a quirk of history, glibc ver-
     sions before 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 using syscall(2).

BUGS

     There is no way to indicate the size of the buffer allocated for table.
     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
     of query_module(2) (which is itself nowadays  deprecated  in  favor  of
     other interfaces described on its manual page).

SEE ALSO

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

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.

Linux 2017-09-15 GET_KERNEL_SYMS(2)

/data/webs/external/dokuwiki/data/pages/man/get_kernel_syms.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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