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clone-tarou | |
*.o | |
*.a | |
*.out |
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#define _GNU_SOURCE | |
#include <sys/wait.h> | |
#include <sched.h> | |
#include <string.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <signal.h> | |
#include <unistd.h> | |
#define EXECVE_FAILED \ | |
perror("execve"); \ | |
exit(1) | |
int use_clone_parent = 0; | |
int become_jirou(void *dummy) { | |
char *args[] = {"clone-tarou", "jirou", NULL}; | |
execve("/proc/self/exe", args, NULL); | |
EXECVE_FAILED; | |
} | |
int main(int argc, char *argv[]) { | |
if (argc <= 1) { | |
fprintf(stderr, "Usage: %s arg1 [--use-clone-parent]\n", argv[0]); | |
exit(1); | |
} | |
if (argc >= 3) { | |
if (!strcmp(argv[2], "--use-clone-parent")) { | |
use_clone_parent = 1; | |
} | |
} | |
if(!strcmp(argv[1], "parent")) { | |
pid_t pid = fork(); | |
if(pid == 0) { | |
if(use_clone_parent) { | |
char *args[] = {"clone-tarou", "tarou", "--use-clone-parent", NULL}; | |
execve("/proc/self/exe", args, NULL); | |
EXECVE_FAILED; | |
} else { | |
char *args[] = {"clone-tarou", "tarou", NULL}; | |
execve("/proc/self/exe", args, NULL); | |
EXECVE_FAILED; | |
} | |
} else { | |
while((pid = waitpid(-1, NULL, 0)) >= 0) { | |
printf("[!] exit: PID=%d\n", pid); | |
} | |
} | |
} else if (!strcmp(argv[1], "tarou")) { | |
#define STACK_SIZE (1024 * 1024) | |
char *stack; | |
char *stack_top; | |
stack = malloc(STACK_SIZE); | |
stack_top = stack + STACK_SIZE; | |
int flag = SIGCHLD; | |
if(use_clone_parent) { | |
flag |= CLONE_PARENT; | |
} | |
int pid = clone(become_jirou, stack_top, flag, NULL); | |
if((pid = waitpid(pid, NULL, 0)) >= 0) { | |
printf("[!] Jirou (%d) is added under tarou and exit\n", pid); | |
} else { | |
printf("[!] Hey, maybe a new sibling is added\n"); | |
sleep(5); | |
} | |
} else if (!strcmp(argv[1], "jirou")) { | |
sleep(1); | |
system("ps axf | grep clone-taro[u] | grep -v grep"); | |
sleep(5); | |
} else { | |
fprintf(stderr, "Invalid role: %s\n", argv[1]); | |
exit(1); | |
} | |
exit(0); | |
} |
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