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fork_1.c
55 lines (43 loc) · 1.3 KB
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fork_1.c
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
int counter = 200;
int main(int argc, const char* argv[])
{
int i;
pid_t pid;
for(i=0; i<5; ++i) { // 通过i可区分进程
pid = fork();
if(pid == 0) // 子进程跳出for循环
break;
}
if(i<5) {
counter += 300;
printf(" child process , pid = %d, ppid = %d\n", getpid(), getppid());
printf("counter = %d, &counter = %p\n\n", counter, &counter);
}
else if(i == 5) {
counter += 100;
printf(" parent process, pid = %d, ppid = %d, &counter = %p\n", getpid(), getppid(), &counter);
printf("counter = %d, &counter = %p\n\n", counter, &counter);
sleep(1);
}
return 0;
}
/*
child process , pid = 25474, ppid = 25473
counter = 500, &counter = 0x60104c
parent process, pid = 25473, ppid = 22642, &counter = 0x60104c
counter = 300, &counter = 0x60104c
child process , pid = 25475, ppid = 25473
counter = 500, &counter = 0x60104c
child process , pid = 25476, ppid = 25473
counter = 500, &counter = 0x60104c
child process , pid = 25477, ppid = 25473
counter = 500, &counter = 0x60104c
child process , pid = 25478, ppid = 25473
counter = 500, &counter = 0x60104c
*/