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#define _GNU_SOURCE
#include <fcntl.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
// #include <sys/types.h>
// #include <sys/stat.h>
int cloned_func(void *arg)
{
printf("hello from clone\n");
fflush(stdout);
return 0;
}
int main()
{
char *temp_filename = "./tempfile";
char *message = "special message\n";
char *clone_stack = malloc(1024);
char *clone_stack_top = clone_stack + 1024;
// SYS_fork
printf("testing fork\n");
fflush(stdout);
pid_t child_pid = fork();
if (child_pid == 0) { // if in child
printf("testing exec\n");
fflush(stdout);
// SYS_execve
execl("/bin/ls", "ls", (char*)0);
return 0;
}
wait(NULL);
// SYS_clone
printf("testing clone\n");
pid_t cloned_pid = clone(cloned_func, clone_stack_top, SIGCHLD, 0);
wait(NULL);
// SYS_creat
printf("testing creat\n");
int tfd = creat(temp_filename, S_IRWXU);
close(tfd);
// SYS_open
printf("testing open\n");
tfd = open(temp_filename, O_RDWR);
write(tfd, message, strlen(message));
close(tfd);
// SYS_openat
printf("testing openat\n");
tfd = openat(AT_FDCWD, temp_filename, O_RDWR | O_APPEND);
close(tfd);
// SYS_unlink
printf("testing unlink\n");
unlink(temp_filename);
// SYS_unlinkat
printf("testing unlinkat\n");
tfd = creat(temp_filename, S_IRWXU);
close(tfd);
unlinkat(AT_FDCWD, temp_filename, 0);
return 0;
}
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