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In C, int x; creates an integer variable associated with the identifier x initialized to one .
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kldsym(2) [bsd man page]

KLDSYM(2)						      BSD System Calls Manual							 KLDSYM(2)

NAME
kldsym -- look up address by symbol name in a KLD LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/param.h> #include <sys/linker.h> int kldsym(int fileid, int command, void *data); DESCRIPTION
The kldsym() system call returns the address of the symbol specified in data in the module specified by fileid. If fileid is 0, all loaded modules are searched. Currently, the only command implemented is KLDSYM_LOOKUP. The data argument is of the following structure: struct kld_sym_lookup { int version; /* sizeof(struct kld_sym_lookup) */ char *symname; /* Symbol name we are looking up */ u_long symvalue; size_t symsize; }; The version member is to be set by the code calling kldsym() to sizeof(struct kld_sym_lookup). The next two members, version and symname, are specified by the user. The last two, symvalue and symsize, are filled in by kldsym() and contain the address associated with symname and the size of the data it points to, respectively. RETURN VALUES
The kldsym() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The kldsym() system call will fail if: [EINVAL] Invalid value in data->version or command. [ENOENT] The fileid argument is invalid, or the specified symbol could not be found. SEE ALSO
kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldunload(2), modfind(2), modnext(2), modstat(2), kld(4) HISTORY
The kldsym() system call first appeared in FreeBSD 3.0. BSD
July 26, 2001 BSD

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KLDSTAT(2)                                                    BSD System Calls Manual                                                   KLDSTAT(2)

NAME
kldstat -- get status of kld file LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/param.h> #include <sys/linker.h> int kldstat(int fileid, struct kld_file_stat *stat); DESCRIPTION
The kldstat() system call writes the info for the file referred to by fileid into stat. struct kld_file_stat { int version; /* set to sizeof(linker_file_stat) */ char name[MAXPATHLEN]; int refs; int id; caddr_t address; /* load address */ size_t size; /* size in bytes */ char pathname[MAXPATHLEN]; }; version This field is set to the size of the structure mentioned above by the code calling kldstat(), and not kldstat() itself. name The name of the file referred to by fileid. refs The number of modules referenced by fileid. id The id of the file specified in fileid. address The load address of the kld file. size The size of the file. pathname The full name of the file referred to by fileid, including the path. RETURN VALUES
The kldstat() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The information for the file referred to by fileid is filled into the structure pointed to by stat unless: [ENOENT] The file was not found (probably not loaded). [EINVAL] The version specified in the version field of stat is not the proper version. You would need to rebuild world, the ker- nel, or your application, if this error occurs, given that you did properly fill in the version field. [EFAULT] There was a problem copying one, some, or all of the fields into stat in the copyout(9) function. SEE ALSO
kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldsym(2), kldunload(2), modfind(2), modfnext(2), modnext(2), modstat(2), kld(4), kldstat(8) HISTORY
The kld interface first appeared in FreeBSD 3.0. BUGS
The pathname many not be accurate if the file system mounts have changed since the module was loaded, or if this function is called within a chrooted environment. BSD March 3, 1999 BSD

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