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fork_example.c

上一篇 / 下一篇 2008-03-16 13:02:58 / 个人分类：linux应用

keven@localhost systemCall]$ cat -n fork_example.c
     1 #include <stdio.h>
     2 #include <unistd.h>
     3 #include <stdlib.h>
     4 #include <string.h>
     5 #include <sys/types.h>
     6 #include <sys/stat.h>
     7 #include <fcntl.h>
     8 #include <errno.h>
     9 extern int errno;
    10
    11 int main()
    12 {
    13          char buf[100];
    14          pid_t child_pid;
    15          int fd;
    16          int status;
    17
    18          if((fd=open("temp",O_CREAT|O_TRUNC|O_RDWR,S_IRWXU))==-1)
    19          {
    20                  printf("open error %d",errno);
    21                  exit(1);
    22          }
    23          strcpy(buf,"This is parent process write");
    24          if((child_pid=fork())==0)
    25          {
    26                  strcpy(buf,"This is child process write");
    27                  printf("This is child process");
    28                  printf("My PID(child) is %d\n",getpid());
    29                  printf("My parent PID is %d\n",getppid());
    30                  write(fd,buf,strlen(buf));
    31                  close(fd);
    32                  exit(0);
    33          }
    34          else
    35          {
    36                  printf("This is parent process");
    37                  printf("My PID(parent) is :%d\n",getpid());
    38                  printf("My child PID is %d\n",child_pid);
    39                  write(fd,buf,strlen(buf));
    40                  close(fd);
    41          }
    42          wait(&status);
    43          return 0;
    44 }
[keven@localhost systemCall]$ ./fork_example
This is child processMy PID(child) is 6207
My parent PID is 6206
This is parent processMy PID(parent) is :6206
My child PID is 6207
[keven@localhost systemCall]$