67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
// SPDX-License-Identifier: MPL-2.0
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#define _GNU_SOURCE
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#include <err.h>
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#include <errno.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/sysmacros.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#ifndef CLONE_PIDFD
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#define CLONE_PIDFD 0x00001000
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#endif
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static pid_t sys_clone3(struct clone_args *args)
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{
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return syscall(SYS_clone3, args, sizeof(struct clone_args));
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}
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#define ptr_to_u64(ptr) ((__u64)((uintptr_t)(ptr)))
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int main(int argc, char *argv[])
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{
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int pidfd = -1;
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pid_t parent_tid = -1, pid = -1;
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struct clone_args args = { 0 };
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args.parent_tid = ptr_to_u64(&parent_tid); /* CLONE_PARENT_SETTID */
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args.flags = CLONE_PARENT_SETTID;
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args.exit_signal = SIGCHLD;
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pid = sys_clone3(&args);
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if (pid < 0) {
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printf("%s - Failed to create new process\n", strerror(errno));
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exit(EXIT_FAILURE);
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}
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if (pid == 0) {
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printf("Child process with pid %d\n", getpid());
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exit(EXIT_SUCCESS);
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}
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printf("Parent process: child's pid %d\n", pid);
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printf("Parent process: child's pid %d in parent_tid\n",
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*(pid_t *)args.parent_tid);
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waitpid(pid, NULL, 0);
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if (pid != *(pid_t *)args.parent_tid)
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exit(EXIT_FAILURE);
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close(pidfd);
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return 0;
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}
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