kafs(3)
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KAFS(3) NetBSD Programmer's Manual KAFS(3)
NAME
k_hasafs, k_pioctl, k_unlog, k_setpag, k_afs_cell_of_file, krb_afslog,
krb_afslog_uid - AFS library
LIBRARY
Kerberos IV AFS Library (libkafs, -lkafs)
SYNOPSIS
#include <kerberosIV/kafs.h>
int
k_afs_cell_of_file(const char *path, char *cell, int len);
int
k_hasafs();
int
k_pioctl(char *a_path, int o_opcode, struct ViceIoctl *a_paramsP,
int a_followSymlinks);
int
k_setpag();
int
k_unlog();
int
krb_afslog(char *cell, char *realm);
int
krb_afslog_uid(char *cell, char *realm, uid_t uid);
DESCRIPTION
k_hasafs() initializes some library internal structures, and tests for
the presence of AFS in the kernel, none of the other functions should be
called before k_hasafs() is called, or if it fails.
krb_afslog(), and krb_afslog_uid() obtains new tokens (and possibly tick-
ets) for the specified cell and realm. If cell is NULL, the local cell
is used. If realm is NULL, the function tries to guess what realm to use.
Unless you have some good knowledge of what cell or realm to use, you
should pass NULL. krb_afslog() will use the real user-id for the ViceId
field in the token, krb_afslog_uid() will use uid.
k_afs_cell_of_file() will in cell return the cell of a specified file, no
more than len characters is put in cell.
k_pioctl() does a pioctl() syscall with the specified arguments. This
function is equivalent to lpioctl().
k_setpag() initializes a new PAG.
k_unlog() removes destroys all tokens in the current PAG.
RETURN VALUES
k_hasafs() returns 1 if AFS is present in the kernel, 0 otherwise.
krb_afslog() and krb_afslog_uid() returns 0 on success, or a kerberos er-
ror number on failure. k_afs_cell_of_file(), k_pioctl(), k_setpag(), and
k_unlog() all return the value of the underlaying system call, 0 on suc-
cess.
ENVIRONMENT
The following environment variable affect the mode of operation of kafs:
AFS_SYSCALL Normally, kafs will try to figure out the correct system
call(s) that are used by AFS by itself. If it does not man-
age to do that, or does it incorrectly, you can set this
variable to the system call number or list of system call
numbers that should be used.
EXAMPLES
The following code from login will obtain a new PAG and tokens for the
local cell and the cell of the users home directory.
if (k_hasafs()) {
char cell[64];
k_setpag();
if(k_afs_cell_of_file(pwd->pw_dir, cell, sizeof(cell)) == 0)
krb_afslog(cell, NULL);
krb_afslog(NULL, NULL);
}
ERRORS
If any of these functions (apart from k_hasafs()) is called without AFS
beeing present in the kernel, the process will usually (depending on the
operating system) receive a SIGSYS signal.
SEE ALSO
Transarc Corporation, "File Server/Cache Manager Interface", AFS-3
Programmer's Reference, 1991.
NetBSD 1.6.1 May 7, 1997 2
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