1
我正在寫我的第一個叉管代碼，以瞭解它是如何工作的。3叉和6管
問題是我想創造3個與他父親交流的孩子，每個孩子將執行不同的任務。
這是我工作的代碼：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
int main(void)
{
int nbytes;
int fd1[2], fd11[2]; /*fd1-->child1*/
int fd2[2], fd21[2]; /*fd2-->child2*/
int fd3[2], fd31[2]; /*fd3-->child3*/
pid_t child1, child2, child3;
char string[] = "Hello, world!\n";
char string1[] = "Shuting Down\n";
char readbuffer[80];
printf("child1-->%d\n", child1);
if (child1==0 && child2==0 && child3==0){
printf(" HOLA-> pid %d\n", getpid());
if(pipe(fd1)==-1 || pipe(fd11)==-1){ //Creating Pipes for son 1
perror("pipe");
exit(-1);
}
if(pipe(fd2)==-1 || pipe(fd21)==-1){ //Creating Pipes for son 2
perror("pipe");
exit(-1);
}
if(pipe(fd3)==-1 || pipe(fd31)==-1){ //Creating Pipes for son 3
perror("pipe");
exit(-1);
}
if((child1 = fork()) == -1){
perror("fork");
exit(-1);
}
/*Creating child 2 and 3*/
if((child2 = fork()) == -1){
perror("fork");
exit(-1);
}
if((child3 = fork()) == -1){
perror("fork");
exit(-1);
}
}
if(child1==0){ // Child 1
close(fd2[0]);close(fd21[0]);close(fd3[0]);close(fd31[0]);
close(fd2[1]);close(fd21[1]);close(fd3[1]);close(fd31[1]);
close(fd1[1]); /* Son process closes up output side of pipe */
close(fd11[0]); /* Son process closes up input side of pipe */
/* Read in a string from the pipe */
read(fd1[0], readbuffer, sizeof(readbuffer));
printf("I'm SON1 -->Received string: %s\n", readbuffer);
printf("LOADING...\n");
sleep(2);
write(fd11[1], "SON1-->Shuting Down\n", (strlen("SON1-->Shuting Down\n")+1));
printf("I'm SON1 -->send string & shutdown\n");
exit(0);
}else if(child2==0){ // Child 2
close(fd1[0]);close(fd11[0]);close(fd3[0]);close(fd31[0]);
close(fd1[1]);close(fd11[1]);close(fd3[1]);close(fd31[1]);
close(fd2[1]); /* Son process closes up output side of pipe */
close(fd21[0]); /* Son process closes up input side of pipe */
/* Read in a string from the pipe */
read(fd2[0], readbuffer, sizeof(readbuffer));
printf("I'm SON2 -->Received string: %s\n", readbuffer);
printf("LOADING...\n");
sleep(2);
write(fd21[1], "SON2-->Shuting Down\n", (strlen("SON2-->Shuting Down\n")+1));
printf("I'm SON2 -->send string & shutdown\n");
exit(0);
}else if(child3==0){ // Child 3
close(fd2[0]);close(fd21[0]);close(fd1[0]);close(fd11[0]);
close(fd2[1]);close(fd21[1]);close(fd1[1]);close(fd11[1]);
close(fd3[1]); /* Son process closes up output side of pipe */
close(fd31[0]); /* Son process closes up input side of pipe */
/* Read in a string from the pipe */
read(fd3[0], readbuffer, sizeof(readbuffer));
printf("I'm SON3 -->Received string: %s\n", readbuffer);
printf("LOADING...\n");
sleep(2);
write(fd31[1], "SON3-->Shuting Down\n", (strlen("SON3-->Shuting Down\n")+1));
printf("I'm SON3 -->send string & shutdown\n");
exit(0);
}else{ // DAD Code
close(fd1[0]);close(fd2[0]);close(fd3[0]); /* Father process closes up input side of pipe */
close(fd11[1]);close(fd21[1]);close(fd31[1]); /* Father process closes up output side of pipe */
/* Send "string" through the output side of pipe */
write(fd1[1], string, (strlen(string)+1));
printf("I'm the father -->send string to SON1\n");
write(fd2[1], string, (strlen(string)+1));
printf("I'm the father -->send string to SON2\n");
write(fd3[1], string, (strlen(string)+1));
printf("I'm the father -->send string to SON3\n");
read(fd11[0], readbuffer, sizeof(readbuffer));
printf("I'm the father -->SON1 Received string: %s", readbuffer);
read(fd21[0], readbuffer, sizeof(readbuffer));
printf("I'm the father -->SON2 Received string: %s", readbuffer);
read(fd31[0], readbuffer, sizeof(readbuffer));
printf("I'm the father -->SON3 Received string: %s", readbuffer);
sleep(2);
printf("Father shuting down\n");
exit(0);
}
return(0);
}
我的問題是，當我執行的代碼，它apears類似的東西：
I'm the father -->send string to SON1
I'm the father -->send string to SON2
I'm the father -->send string to SON3
I'm SON3 -->Received string: Hello, world!
LOADING...
I'm SON2 -->Received string: Hello, world!
LOADING...
I'm SON1 -->Received string: Hello, world!
LOADING...
I'm SON3 -->send string & shutdown
I'm SON2 -->send string & shutdown
I'm SON1 -->send string & shutdown
I'm the father -->SON1 Received string: SON1-->Shuting Down
I'm the father -->SON2 Received string: SON2-->Shuting Down
I'm the father -->SON3 Received string: SON3-->Shuting Down
Father shuting down
V:~$ I'm SON2 -->Received string:
LOADING...
I'm SON1 -->Received string:
LOADING...
I'm SON1 -->Received string:
LOADING...
I'm SON1 -->Received string:
LOADING...
我的問題是：在哪裏¿對兒子的四次呼喚是從哪裏來的？ ¿我錯過了什麼？
任何幫助，將不勝感激！
謝謝你提前和對不起我的拼寫錯誤
哪種語言，C或C++？他們是兩種不同的語言。 C++語言支持線程。 C++語言具有'std :: string'，C不具有。 –
哪個平臺？標準的C語言不支持線程，因爲它是平臺特定的問題。 –
女士們，先生們，[叉子炸彈]。（https://en.wikipedia.org/wiki/Fork_bomb） – user4581301