53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <signal.h>
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extern char **environ;
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int weak_process(){
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printf("get signal\n");
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}
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int main(void)
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{
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// 获取进程ID
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printf("I am %d \n", getpid());
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printf("My parent is %d\n", getppid());
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// 打印环境变量
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// char **env = environ;
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// while (*env != NULL)
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// {
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// printf("%s\n", *env);
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// *env++;
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// }
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// fock创建进程
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// fock创建的子进程一般用来执行新的程序
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signal(SIGUSR1,weak_process);
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pid_t pid = fork();
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if (pid == 0)
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{
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printf("I am child process %d\n", getpid());
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sleep(10);
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_exit(0);
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}
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else if (pid > 0)
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{
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sleep(1);
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kill(pid,SIGUSR1);
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wait(NULL);
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// printf("pit = %d\n",pid);
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printf("I am parent process %d\n", getpid());
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}
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else
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{
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printf("fork error\n");
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}
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return 0;
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} |