磨砺技术珠矶,践行数据之道,追求卓越价值
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[作者 高健@博客园 luckyjackgao@gmail.com]
用这个从网上找的例子,看父子进程对全局变量的拥有是否不同:
#include#include #include int glob = 6; char buf[] = "a write to stdout\n"; int main() { int var; pid_t pid; var = 88; fprintf(stderr, "%s", buf); printf("before fork/n"); if(( pid = fork() ) < 0 ) { fprintf(stderr, "fork error/n"); } else if(pid == 0) { glob++; var++; printf("child process/n"); printf("pid = %d, father pid = %d, glob = %d, var = %d/n", getpid(), getppid(), glob, var); exit(0); } else { sleep(2); printf("father process/n"); printf("pid = %d, father pid = %d, glob = %d, var = %d/n", getpid(), getppid(), glob, var); } return 0; }
运行结果如下:
a write to stdout
before forkchild process pid=13712, father pid=13711, glob=13662, var=7father process pid=13711, father pid=13539, glob=6, var=6这表明,父子进程各有各的全局变量。
[作者 高健@博客园 luckyjackgao@gmail.com]
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磨砺技术珠矶,践行数据之道,追求卓越价值