06-13-2006
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KSYMS(4) BSD Kernel Interfaces Manual KSYMS(4)
NAME
ksyms -- kernel symbol table interface
SYNOPSIS
pseudo-device ksyms
DESCRIPTION
The /dev/ksyms character device provides a read-only interface to the current kernel symbol table. It can be accessed either as a sequential
file, where it looks like an executable file but with zero-sized text and data segments, or via ioctl(2).
/dev/ksyms represents the symbol table at the time when the device is opened, and may not change until it is closed.
The in-kernel symbol manager is designed to be able to handle any type of symbol table. However, only elf(5) symbol tables are currently
dealt with.
IOCTLS
The ioctl(2) command codes below are defined in <sys/ksyms.h>.
The (third) argument to the ioctl(2) should be a pointer to the type indicated.
KIOCGSIZE (int)
Returns the total size of the current symbol table. This should be used when allocating a buffer to read in the whole symbol
table to memory.
KIOCGVALUE (struct ksyms_gsymbol)
Returns the value for the given symbol name in a symtab-independent fashion.
struct ksyms_gsymbol {
const char *kg_name;
unsigned long *kg_value;
};
The struct element kg_name should be set to the name of the requested value, and the address that kg_value points to will
receive the symbol value.
KIOCGSYMBOL (struct ksyms_gsymbol)
Returns the complete symbol for the given symbol name.
struct ksyms_gsymbol {
const char *kg_name;
void *kg_sym;
};
The struct element kg_name should be set to the name of the requested symbol, and the found symbol will be written to the
kg_sym address. It is the callers responsibility to ensure that enough space for the symbol is allocated.
FILES
/dev/ksyms
SEE ALSO
ioctl(2), nlist(3), elf(5)
HISTORY
A ksyms device exists in many different operating systems. This implementation is modelled in function after Solaris ksyms. This ksyms
driver was written by Anders Magnusson for NetBSD.
The ksyms driver first appeared in NetBSD 2.0.
BSD
November 12, 2008 BSD