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PID 的代码
init.c
#include "apue.h"
#include
#include
#include
void
daemonize(const char *cmd)
{
int i, fd0, fd1, fd2;
pid_t pid;
struct rlimit rl;
struct sigaction sa
orphan3.c
#include "apue.h"
#include
static void
sig_hup(int signo)
{
printf("SIGHUP received, pid = %d\n", getpid());
}
static void
pr_ids(char *name)
{
printf("%s: pid = %d, ppid = %d, pgrp = %d
chap2_7f.m
%PID Controler Based on Ziegler-Nichols
clear all;
close all;
sys=tf(400,[1,30,200,0]);
figure(1);
rlocus(sys);
[km,pole]=rlocfind(sys)
wm=imag(pole(2));
kp=0.6*km
kd=kp*pi/(4*wm)
ki=k
chap2_7f.m
%PID Controler Based on Ziegler-Nichols
clear all;
close all;
sys=tf(400,[1,30,200,0]);
figure(1);
rlocus(sys);
[km,pole]=rlocfind(sys)
wm=imag(pole(2));
kp=0.6*km
kd=kp*pi/(4*wm)
ki=k
sys_chrt.c
#include "syslib.h"
PUBLIC int sys_chrt( pid, deadline)
int pid;
long deadline;
{
message m;
m.m2_i1 = pid;
m.m2_l1 = deadline;
return(_taskcall(SYSTASK, SYS_CHRT, &m));
}
daemonize.c
#include "apue.h"
#include
#include
#ifdef BSD
#include
#endif
#include
void
daemonize(const char *cmd)
{
int i, fd0, fd1, fd2;
pid_t pid;
struct
deadlock.c
#include "apue.h"
#include
static void
lockabyte(const char *name, int fd, off_t offset)
{
if (writew_lock(fd, offset, SEEK_SET, 1) < 0)
err_sys("%s: writew_lock error", name);
printf("
shell2.c
#include "apue.h"
#include
static void sig_int(int); /* our signal-catching function */
int
main(void)
{
char buf[MAXLINE]; /* from apue.h */
pid_t pid;
int status;
if (signal(SI
vfork3.c
#include "apue.h"
static void f1(void), f2(void);
int
main(void)
{
f1();
f2();
_exit(0);
}
static void
f1(void)
{
pid_t pid;
if ((pid = vfork()) < 0)
err_sys("vfork error");
/* child and p
fig14.7
#include "apue.h"
#include
static void
lockabyte(const char *name, int fd, off_t offset)
{
if (writew_lock(fd, offset, SEEK_SET, 1) < 0)
err_sys("%s: writew_lock error", name);
printf("