osx man page for nlist

NLIST(3)						   BSD Library Functions Manual 						  NLIST(3)

NAME
     nlist -- retrieve symbol table name list from an executable file

SYNOPSIS
     #include <mach-o/nlist.h>

     int
     nlist(const char *filename, struct nlist *nl);

DESCRIPTION
     The nlist() function retrieves name list entries from the symbol table of an executable file. (See <mach-o/nlist.h>) The argument nl is set
     to reference the beginning of the list.  The list is preened of binary and invalid data; if an entry in the name list is valid, the n_type
     and n_value for the entry are copied into the list referenced by nl.  No other data is copied.  The last entry in the list is always NULL.

RETURN VALUES
     The number of invalid entries is returned if successful; otherwise, if the file filename does not exist or is not executable, the returned
     value is -1.

SEE ALSO
     Mach-O(5)

HISTORY
     A nlist() function appeared in Version 6 AT&T UNIX.

Darwin								  April 19, 1994							    Darwin