FATAL: attempted to create non-posix thread; clone_flags == 00004111

[Saikatsaha1996]

[ZhymabekRoman]

clone operation is available in Android.

[ZhymabekRoman]

#define _GNU_SOURCE
#include <signal.h>
#include <sched.h>

static int child_func(void* arg) {
  char* buf = (char*)arg;
  printf("Child sees buf = \"%s\"\n", buf);
  strcpy(buf, "hello from child");
  return 0;
}

int main(int argc, char** argv) {
  // Allocate stack for child task.
  const int STACK_SIZE = 65536;
  char* stack = malloc(STACK_SIZE);
  if (!stack) {
    perror("malloc");
    exit(1);
  }

  // When called with the command-line argument "vm", set the CLONE_VM flag on.
  unsigned long flags = 0;
  if (argc > 1 && !strcmp(argv[1], "vm")) {
    flags |= CLONE_VM;
  }

  char buf[100];
  strcpy(buf, "hello from parent");
  if (clone(child_func, stack + STACK_SIZE, CLONE_VM | SIGCHLD, buf) == -1) {
    perror("clone");
    exit(1);
  }

  int status;
  if (wait(&status) == -1) {
    perror("wait");
    exit(1);
  }

  printf("Child exited with status %d. buf = \"%s\"\n", status, buf);
  return 0;
}

[Saikatsaha1996]

#define _GNU_SOURCE
#include <signal.h>
#include <sched.h>

static int child_func(void* arg) {
  char* buf = (char*)arg;
  printf("Child sees buf = \"%s\"\n", buf);
  strcpy(buf, "hello from child");
  return 0;
}

int main(int argc, char** argv) {
  // Allocate stack for child task.
  const int STACK_SIZE = 65536;
  char* stack = malloc(STACK_SIZE);
  if (!stack) {
    perror("malloc");
    exit(1);
  }

  // When called with the command-line argument "vm", set the CLONE_VM flag on.
  unsigned long flags = 0;
  if (argc > 1 && !strcmp(argv[1], "vm")) {
    flags |= CLONE_VM;
  }

  char buf[100];
  strcpy(buf, "hello from parent");
  if (clone(child_func, stack + STACK_SIZE, CLONE_VM | SIGCHLD, buf) == -1) {
    perror("clone");
    exit(1);
  }

  int status;
  if (wait(&status) == -1) {
    perror("wait");
    exit(1);
  }

  printf("Child exited with status %d. buf = \"%s\"\n", status, buf);
  return 0;
}

I should create .so file with this ? And need to set as LD_PRELOAD ?

Found more information https://github.com/DynamoRIO/dynamorio/blob/master/suite/tests/linux/clone.c

[ZhymabekRoman]

I should create .so file with this ?

No, it's a clone working test example. Just compile it with gcc and run it. Test it in Android and in Exagear. In Exagear it will not run, in Android it will.

[Saikatsaha1996]

I should create .so file with this ?

No, it's a clone working test example. Just compile it with gcc and run it. Test it in Android and in Exagear. In Exagear it will not run, in Android it will.

gcc hello.c -o hello
hello.c:7:3: warning: call to undeclared library function 'printf' with type 'int (const char *, ...)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  printf("Child sees buf = \"%s\"\n", buf);
  ^
hello.c:7:3: note: include the header <stdio.h> or explicitly provide a declaration for 'printf'
hello.c:8:3: warning: call to undeclared library function 'strcpy' with type 'char *(char *, const char *)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  strcpy(buf, "hello from child");
  ^
hello.c:8:3: note: include the header <string.h> or explicitly provide a declaration for 'strcpy'
hello.c:15:17: warning: call to undeclared library function 'malloc' with type 'void *(unsigned long)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  char* stack = malloc(STACK_SIZE);
                ^
hello.c:15:17: note: include the header <stdlib.h> or explicitly provide a declaration for 'malloc'
hello.c:17:5: warning: call to undeclared function 'perror'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    perror("malloc");
    ^
hello.c:18:5: warning: call to undeclared library function 'exit' with type 'void (int) __attribute__((noreturn))'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    exit(1);
    ^
hello.c:18:5: note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'
hello.c:23:20: warning: call to undeclared library function 'strcmp' with type 'int (const char *, const char *)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  if (argc > 1 && !strcmp(argv[1], "vm")) {
                   ^
hello.c:23:20: note: include the header <string.h> or explicitly provide a declaration for 'strcmp'
hello.c:30:5: warning: call to undeclared function 'perror'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    perror("clone");
    ^
hello.c:35:7: warning: call to undeclared function 'wait'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  if (wait(&status) == -1) {
      ^
hello.c:36:5: warning: call to undeclared function 'perror'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    perror("wait");
    ^
9 warnings generated.
~ $ ls
ExaTermux          hello    storage
fs-manager-udroid  hello.c  termux-android12-phantom-fix
~ $ ./he*
Child sees buf = "hello from parent"
Child exited with status 0. buf = "hello from child"
~ $

[ageevp]

Which distribution do you use ? Debian 11? The problem seems to be closely related to the operating system. I confirm this but in different environment. I've Odroid xu4 armhf SOC with Debian 11 as a host and Exagear Debian 9 as a guest . I've build Acestreamplayer in guest. If I start play any file Acestreamplayer crash with that issue. NOTE. vlc play well NOTE. Ubuntu version do not have this issue.