wait 함수 (부모가 자식을 안기다립니다.) 리눅스환경

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
 
int main() {
	int x, y, status, i;
	int cnt = 0;
	int flag = 0;
	char buf[50];
	char str[50];
	char * argv[10];
	char * ptr;
 
 
	for (i = 0; i<10; i++) {
 
		putchar('$');
		fgets(buf, 49, stdin);
		buf[strlen(buf) - 1] = 0;
		strcpy(str, buf);
 
		ptr = strtok(buf, " ");
 
		while (ptr != NULL) {
			argv[cnt] = ptr;
			cnt++;
			ptr = strtok(NULL, " ");
		}
 
		if (!strcmp(argv[cnt - 1], "&")) {
			argv[cnt - 1] = 0;
			flag = 1;
		}
		else {
			argv[cnt] = 0;
		}
 
		if (!strcmp(argv[0], "exit")) exit(0);
 
		x = fork();
 
		if (x == 0) {
			printf("I am child to execute %s\n", str);
			y = execve(argv[0], argv, 0);
 
			if (y<0) {
				perror("exec failed");
				exit(1);
			}
 
		}
		else {
			if (flag == 0) {
				wait(&status);
			}
		}
 
 
		flag = 0;
		cnt = 0;
	}
	return 0;
}

======================결과값
 
$/bin/ls
I am child to execute /bin/ls
ch f1 f2 shell shell.c t t.c test test.c testfile
 
$/bin/ls &
$I am child to execute /bin/ls &
ch f1 f2 ch f1 f2 shell shell.c t t.c test test.c testfile
 
$/bin/ls
$I am child to execute /bin/ls
ch f1 f2 shell shell.c t t.c test test.c testfile
 
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