利用进程创建2个子进程,子进程1负责一批数据的求和、平均值、最大值计算;子进程2负责这批数据的排序,并输出结果。(提示使用exec函数族)
时间: 2023-05-21 15:06:53 浏览: 61
可以使用fork函数创建两个子进程,然后在子进程1中使用exec函数族的其中一个函数执行程序进行求和、平均值、最大值计算,子进程2中执行程序进行数据排序并输出结果。以下是示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
int main() {
int data[10] = {5, 2, 1, 9, 0, 8, 7, 6, 4, 3};
int sum = 0, max = data[0];
double avg;
int pipefd[2];
if (pipe(pipefd) == -1) {
perror("pipe");
exit(EXIT_FAILURE);
}
pid_t pid1 = fork();
if (pid1 == -1) {
perror("fork");
exit(EXIT_FAILURE);
} else if (pid1 == 0) {
// Child process 1
close(pipefd[0]);
dprintf(pipefd[1], "%d %d %d\n", sum, max, sizeof(data)/sizeof(data[0]));
// Execute program for calculating sum, max, average
if (execl("/usr/bin/calc", "calc", (char*)NULL) == -1) {
perror("execl");
exit(EXIT_FAILURE);
}
} else {
pid_t pid2 = fork();
if (pid2 == -1) {
perror("fork");
exit(EXIT_FAILURE);
} else if (pid2 == 0) {
// Child process 2
close(pipefd[1]);
// Read data from pipe
int n;
read(pipefd[0], &sum, sizeof(sum));
read(pipefd[0], &max, sizeof(max));
read(pipefd[0], &n, sizeof(n));
int* data = (int*)malloc(sizeof(int)*n);
read(pipefd[0], data, sizeof(int)*n);
// Sort data
qsort(data, n, sizeof(int), cmp);
// Output sorted data
printf("Sorted data:\n");
for (int i = 0; i < n; i++) {
printf("%d ", data[i]);
}
free(data);
} else {
// Parent process
close(pipefd[0]);
close(pipefd[1]);
int status1, status2;
waitpid(pid1, &status1, 0);
waitpid(pid2, &status2, 0);
printf("Child process 1 terminated with status %d\n", status1);
printf("Child process 2 terminated with status %d\n", status2);
}
}
return 0;
}
```
其中calc程序实现了对数据的求和、平均值、最大值计算。cmp函数用于qsort进行排序:
```c
int cmp(const void* a, const void* b) {
return (*(int*)a - *(int*)b);
}
```
注意:以上代码仅为示例,实际使用时需根据具体需求修改。