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PID 的代码
test1.c
#include
#include "ourhdr.h"
int
main(void)
{
pid_t pid;
if ( (pid = fork()) < 0)
err_sys("fork error");
else if (pid != 0) { /* parent */
sleep(2);
exit(2); /* terminate wit
fork2.c
#include
#include
#include "ourhdr.h"
int
main(void)
{
pid_t pid;
if ( (pid = fork()) < 0)
err_sys("fork error");
else if (pid == 0) { /* first child */
if ( (pid
system.c
#include
#include
#include
#include
int
system(const char *cmdstring) /* version without signal handling */
{
pid_t pid;
int status;
if (cmdstring
child.c
#include
#include
#include
static void sig_cld();
int
main()
{
pid_t pid;
if (signal(SIGCLD, sig_cld) == -1)
perror("signal error");
if ( (pid = fork()) < 0
daemoninit.c
#include
#include
#include
#include "ourhdr.h"
int
daemon_init(void)
{
pid_t pid;
if ( (pid = fork()) < 0)
return(-1);
else if (pid != 0)
exit(0); /* pare
pipe1.c
#include "ourhdr.h"
int
main(void)
{
int n, fd[2];
pid_t pid;
char line[MAXLINE];
if (pipe(fd) < 0)
err_sys("pipe error");
if ( (pid = fork()) < 0)
err_sys("fork error");
else if (pid >
daemoninit.c
#include
#include
#include
#include "ourhdr.h"
int
daemon_init(void)
{
pid_t pid;
if ( (pid = fork()) < 0)
return(-1);
else if (pid != 0)
exit(0); /* pare
orphan.c
#include
#include
#include
#include
#include "ourhdr.h"
static void sig_hup(int);
static void pr_ids(char *);
int
main(void)
{
char c;
pid_t pid;
pr_
pidadjustmentformula.txt
1. PID常用口诀:
参数整定找最佳，从小到大顺序查，先是比例后积分，最后再把微分加，曲线振荡很频繁
pid.txt
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