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/*********************************************************************\
* Copyright (c) 1991 by Wen-King Su (wen-king@vlsi.cs.caltech.edu) *
* *
* You may copy or modify this file in any manner you wish, provided *
* that this notice is always included, and that you hold the author *
* harmless for any loss or damage resulting from the installation or *
* use of this software. *
\*********************************************************************/
#include "tweak.h"
#include "client_def.h"
#include "c_extern.h"
#ifndef NOLOCKING
static char key_string[sizeof(KEY_PREFIX)+32];
static char code_str[] =
"0123456789:_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static void make_key_string PROTO2(unsigned long, server_addr,
unsigned long, server_port)
{
unsigned long v1, v2;
char *p;
strcpy(key_string,KEY_PREFIX);
for(p = key_string; *p; p++);
v1 = server_addr;
v2 = server_port;
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
v1 = v1 | (v2 << (32-3*6));
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
*p++ = code_str[v1 & 0x3f]; v1 >>= 6;
*p = 0;
}
/********************************************************************/
/******* For those systems that has flock function call *************/
/********************************************************************/
#ifdef USE_FLOCK
#include <sys/file.h>
int key_persists = 1;
static unsigned int lock_fd;
static unsigned short okey;
unsigned short client_get_key PROTO0((void))
{
if(flock(lock_fd,LOCK_EX) == -1) {
perror("flock");
exit(1);
}
if(read(lock_fd,&okey,sizeof(okey)) == -1) {
perror("read"); exit(1);
}
if(lseek(lock_fd,0L,0) == -1) {
perror("seek");
exit(1);
}
return(okey);
}
void client_put_key PROTO1(unsigned short, key)
{
if(write(lock_fd,&key,sizeof(key)) == -1) {
perror("write");
exit(1);
}
if(lseek(lock_fd,0L,0) == -1) {
perror("seek");
exit(1);
}
if(flock(lock_fd,LOCK_UN) == -1) {
perror("unflock");
exit(1);
}
}
void client_init_key PROTO3(unsigned long, server_addr,
unsigned long, server_port,
unsigned short, key)
{
unsigned long omask;
okey = key;
make_key_string(server_addr,server_port);
omask = umask(0);
lock_fd = open(key_string,O_RDWR|O_CREAT,0666);
umask(omask);
}
#endif
/********************************************************************/
/******* For those systems that has lockf function call *************/
/********************************************************************/
#ifdef USE_LOCKF
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
int key_persists = 1;
static unsigned int lock_fd;
static unsigned short okey;
unsigned short client_get_key PROTO0((void))
{
if(lockf(lock_fd,F_LOCK,sizeof(okey)) == -1) {
perror("lockf");
exit(1);
}
if(read(lock_fd,&okey,sizeof(okey)) == -1) {
perror("read");
exit(1);
}
if(lseek(lock_fd,0L,0) == -1) {
perror("seek");
exit(1);
}
return(okey);
}
void client_put_key PROTO1(unsigned short, key)
{
if(write(lock_fd,&key,sizeof(key)) == -1) {
perror("write");
exit(1);
}
if(lseek(lock_fd,0L,0) == -1) {
perror("seek");
exit(1);
}
if(lockf(lock_fd,F_ULOCK,sizeof(key)) == -1) {
perror("unlockf");
exit(1);
}
}
void client_init_key PROTO3(unsigned long, server_addr,
unsigned long, server_port,
unsigned short, key)
{
unsigned long omask;
okey = key;
make_key_string(server_addr,server_port);
omask = umask(0);
lock_fd = open(key_string,O_RDWR|O_CREAT,0666);
umask(omask);
}
#endif
/********************************************************************/
/******* For those systems that has SysV shared memory + lockf ******/
/********************************************************************/
#ifdef USE_SHAREMEM_AND_LOCKF
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/ipc.h>
extern char *shmat();
int key_persists = 0;
static unsigned short *share_key;
static unsigned int lock_fd;
unsigned short client_get_key PROTO0((void))
{
if(lockf(lock_fd,F_LOCK,2) == -1) {
perror("lockf");
exit(1);
}
return(*share_key);
}
void client_put_key PROTO1(unsigned short, key)
{
*share_key = key;
if(lockf(lock_fd,F_ULOCK,2) == -1) {
perror("unlockf");
exit(1);
}
}
void client_init_key PROTO3(unsigned long, server_addr,
unsigned long, server_port,
unsigned short, key)
{
unsigned long omask;
key_t lock_key;
int lock_shm;
make_key_string(server_addr,server_port);
omask = umask(0);
lock_fd = open(key_string,O_RDWR|O_CREAT,0666);
umask(omask);
if((lock_key = ftok(key_string,3432)) == -1) {
perror("ftok");
exit(1);
}
if((lock_shm = shmget(lock_key,sizeof(short),IPC_CREAT|0666)) == -1) {
perror("shmget");
exit(1);
}
if(!(share_key = (unsigned short *) shmat(lock_shm,(char*)0,0))) {
perror("shmat");
exit(1);
}
}
#endif
/********************************************************************/
/******* For those who does not want to use locking *****************/
/********************************************************************/
#else /* NOLOCKING */
int key_persists = 0;
static unsigned short okey;
unsigned short client_get_key PROTO0((void))
{
return(okey);
}
void client_put_key PROTO1(unsigned short, key)
{
okey = key;
}
void client_init_key PROTO3(unsigned long, server_addr,
unsigned long, server_port,
unsigned short, key)
{
okey = key;
}
#endif
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